Application: gvSIG desktop » gvSIG data provider for DWG

/* jdwglib. Java Library for reading Dwg files.

 * 

 * Author: Jose Morell Rama (jose.morell@gmail.com).

 * Port from the Pythoncad Dwg library by Art Haas.

 *

 * Copyright (C) 2005 Jose Morell, IVER TI S.A. and Generalitat Valenciana

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 * Jose Morell (jose.morell@gmail.com)

 * 

 * or

 *

 * IVER TI S.A.

 *  C/Salamanca, 50

 *  46005 Valencia

 *  Spain

 *  +34 963163400

 *  dac@iver.es

 */

package org.gvsig.dwg.lib;

/**

 * The DwgObjectOffset class is useful to store the handle of an object with its

 * offset in the DWG file

 * 

 * @author jmorell

 */

public class DwgObjectOffset {

	private int handle;

	private int offset;

	private int size;

	/**

	 * Create a new DwgObjectOffset object

	 * 

	 * @param handle Handle of the object

	 * @param offset Offset in the DWG file of the object

	 */

	public DwgObjectOffset(int handle, int offset) {

		this.handle = handle;

		this.offset = offset;

	}

    /**

     * @return Returns the handle.

     */

    public int getHandle() {

        return handle;

    }

    /**

     * @return Returns the offset.

     */

    public int getOffset() {

        return offset;

    }

    public void setSize(int size){

    	this.size=size;

    }

    public int getSize(){

    	return this.size;

    }

}

/* jdwglib. Java Library for reading Dwg files.

 *

 * Author: Jose Morell Rama (jose.morell@gmail.com).

 * Port from the Pythoncad Dwg library by Art Haas.

 *

 * Copyright (C) 2005 Jose Morell, IVER TI S.A. and Generalitat Valenciana

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 * Jose Morell (jose.morell@gmail.com)

 *

 * or

 *

 * IVER TI S.A.

 *  C/Salamanca, 50

 *  46005 Valencia

 *  Spain

 *  +34 963163400

 *  dac@iver.es

 */

package org.gvsig.dwg.lib;

import java.nio.ByteBuffer;

import java.nio.ByteOrder;

import java.util.ArrayList;

import java.util.List;

import org.gvsig.dwg.lib.util.HexUtil;

/**

 * The DwgUtil class contains the essential set of functions for reading bitstreams

 * in DWG files

 *

 * @author jmorell

 */

public final class DwgUtil {

	/**

	 * Read the extended data for a DWG object

	 * Don't use in this version. Serious bugs detected

	 *

	 * @param data Array of unsigned bytes obtained from the DWG binary file

	 * @param offset The current bit offset where the value begins

	 * @throws RuntimeException If an unexpected bit value is found in the DWG file. Occurs

	 *             when we are looking for LwPolylines.

	 * @return ArrayList This ArrayList has two parts. First is an int value that represents

	 * 		   the new offset, and second is the extended data of a DWG object

	 */

	public static ArrayList readExtendedData(int[] data, int offset) throws RuntimeException {

		int bitPos = offset;

		ArrayList extData = new ArrayList();

		while (true) {

			int newBitPos = ((Integer)getBitShort(data, bitPos).get(0)).intValue();

			int size = ((Integer) getBitShort(data, bitPos).get(1)).intValue();

			bitPos = newBitPos;

			if (size == 0) {

				break;

			}

			newBitPos = ((Integer)((ArrayList)getHandle(data, bitPos)).get(0)).intValue();

			// TODO: Esto no es correcto. Repasar ...

			int handle = ((Integer)((ArrayList)getHandle(data, bitPos)).get(1)).intValue();

			bitPos = newBitPos;

			ArrayList eedata = new ArrayList();

			while (size > 0) {

				newBitPos = ((Integer)getRawChar(data, bitPos).get(0)).intValue();

				int cb = ((Integer) getRawChar(data, bitPos).get(1)).intValue();

				bitPos = newBitPos;

				size = size - 1;

				if (cb == 0x0) {

					newBitPos = ((Integer)getRawChar(data, bitPos).get(0)).intValue();

					int len = ((Integer)getRawChar(data, bitPos).get(1)).intValue();

					bitPos = newBitPos;

					newBitPos = ((Integer)getRawShort(data, bitPos).get(0)).intValue();

					int cp = ((Integer)getRawShort(data, bitPos).get(1)).intValue();

					bitPos = newBitPos;

					ArrayList chars = new ArrayList();

					for (int i = 0; i < len; i++) {

						newBitPos = ((Integer)getRawChar(data, bitPos).get(0)).intValue();

						int charr = ((Integer)getRawChar(data, bitPos).get(1)).intValue();

						bitPos = newBitPos;

						// �int o char?

						chars.add(new Integer(charr));

					}

					// Incorrecto. Repasar ...

					eedata.add(chars);

					size = size - len - 3;

				} else if (cb == 0x1) {

					System.out.println("Invalid EXX code byte: 0x1");

				} else if (cb == 0x2) {

					newBitPos = ((Integer)getRawChar(data, bitPos).get(0)).intValue();

					int charr = ((Integer)getRawChar(data, bitPos).get(1)).intValue();

					bitPos = newBitPos;

					if (charr == 0x0) {

						eedata.add("{");

					} else if (charr == 0x1) {

						eedata.add("}");

					} else {

						System.out.println("Unexpected EXX char: " + charr);

					}

					size = size - 1;

				} else if (cb == 0x3 || cb == 0x5) {

					ArrayList chars = new ArrayList();

					for (int i = 0; i < 8; i++) {

						newBitPos = ((Integer)getRawChar(data, bitPos).get(0)).intValue();

						int charr = ((Integer)getRawChar(data, bitPos).get(1)).intValue();

						bitPos = newBitPos;

						chars.add(new Integer(charr));

					}

					eedata.add(chars);

					size = size - 8;

				} else if (cb == 0x4) {

					newBitPos = ((Integer)getRawChar(data, bitPos).get(0)).intValue();

					int len = ((Integer)getRawChar(data, bitPos).get(1)).intValue();

					bitPos = newBitPos;

					ArrayList chars = new ArrayList();

					for (int i = 0; i < len; i++) {

						newBitPos = ((Integer)getRawChar(data, bitPos).get(0)).intValue();

						int charr = ((Integer)getRawChar(data, bitPos).get(1)).intValue();

						bitPos = newBitPos;

						chars.add(new Integer(charr));

					}

					eedata.add(chars);

					size = size - len - 1;

				} else if (0xa <= cb && cb <= 0xd) {

					newBitPos = ((Integer)((ArrayList)getRawDouble(data, bitPos)).get(0)).intValue();

					double d1 = ((Double)((ArrayList)getRawDouble(data, bitPos)).get(1)).doubleValue();

					bitPos = newBitPos;

					newBitPos = ((Integer)((ArrayList)getRawDouble(data, bitPos)).get(0)).intValue();

					double d2 = ((Double)((ArrayList)getRawDouble(data, bitPos)).get(1)).doubleValue();

					bitPos = newBitPos;

					newBitPos = ((Integer)((ArrayList)getRawDouble(data, bitPos)).get(0)).intValue();

					double d3 = ((Double)((ArrayList)getRawDouble(data, bitPos)).get(1)).doubleValue();

					bitPos = newBitPos;

					eedata.add(new double[] { d1, d2, d3 });

					size = size - 24;

				} else if (0x28 <= cb && cb <= 0x2a) {

					newBitPos = ((Integer)((ArrayList)getRawDouble(data, bitPos)).get(0)).intValue();

					double d = ((Double)((ArrayList)getRawDouble(data, bitPos)).get(1)).doubleValue();

					bitPos = newBitPos;

					eedata.add(new Double(d));

					size = size - 8;

				} else if (cb == 0x46) {

					newBitPos = ((Integer)getRawShort(data, bitPos).get(0)).intValue();

					int shortt = ((Integer)getRawShort(data, bitPos).get(1)).intValue();

					bitPos = newBitPos;

					eedata.add(new Integer(shortt));

					size = size - 2;

				} else if (cb == 0x47) {

					newBitPos = ((Integer)getRawLong(data, bitPos).get(0)).intValue();

					int longg = ((Integer)getRawLong(data, bitPos).get(1)).intValue();

					bitPos = newBitPos;

					eedata.add(new Integer(longg));

					size = size - 4;

				} else {

					System.out.println("Unexpected code byte: " + cb);

				}

			}

			ArrayList v = new ArrayList();

			// v.add(handle, eedata);

			extData.add(v);

		}

		ArrayList v = new ArrayList();

		v.add(new Integer(bitPos));

		v.add(extData);

		return v;

	}

	/**

	 * Read a double value from a group of unsigned bytes and a default double

	 *

	 * @param data Array of unsigned bytes obtained from the DWG binary file

	 * @param offset The current bit offset where the value begins

	 * @param defVal Default double value

	 * @throws RuntimeException If an unexpected bit value is found in the DWG file. Occurs

	 *             when we are looking for LwPolylines.

	 * @return ArrayList This ArrayList has two parts. First is an int value that represents

	 * 		   the new offset, and second is the double value

	 */

	public static ArrayList getDefaultDouble(int[] data, int offset, double defVal) throws RuntimeException {

		int flags = ((Integer) getBits(data, 2, offset)).intValue();

		int read = 2;

		double val;

		if (flags == 0x0) {

			val = defVal;

		} else {

			int _offset = offset + 2;

			if (flags == 0x3) {

				byte[] bytes = (byte[]) getBits(data, 64, _offset);

				ByteBuffer bb = ByteBuffer.wrap(bytes);

				bb.order(ByteOrder.LITTLE_ENDIAN);

				val = bb.getDouble();

				read = 66;

			} else {

				byte[] dstrArrayAux = new byte[8];

				int[] doubleOffset = new int[] { 0 };

				ByteUtils.doubleToBytes(defVal, dstrArrayAux, doubleOffset);

				byte[] dstrArrayAuxx = new byte[8];

				dstrArrayAuxx[0] = dstrArrayAux[7];

				dstrArrayAuxx[1] = dstrArrayAux[6];

				dstrArrayAuxx[2] = dstrArrayAux[5];

				dstrArrayAuxx[3] = dstrArrayAux[4];

				dstrArrayAuxx[4] = dstrArrayAux[3];

				dstrArrayAuxx[5] = dstrArrayAux[2];

				dstrArrayAuxx[6] = dstrArrayAux[1];

				dstrArrayAuxx[7] = dstrArrayAux[0];

				int[] dstrArrayAuxxx = new int[8];

				for (int i = 0; i < dstrArrayAuxxx.length; i++) {

					dstrArrayAuxxx[i] = ByteUtils.getUnsigned(dstrArrayAuxx[i]);

				}

				byte[] dstrArray = new byte[8];

				for (int i = 0; i < dstrArray.length; i++) {

					dstrArray[i] = (byte) dstrArrayAuxxx[i];

				}

				if (flags == 0x1) {

					byte[] ddArray = (byte[]) getBits(data, 32, _offset);

					dstrArray[0] = ddArray[0];

					dstrArray[1] = ddArray[1];

					dstrArray[2] = ddArray[2];

					dstrArray[3] = ddArray[3];

					read = 34;

				} else {

					byte[] ddArray = (byte[]) getBits(data, 48, _offset);

					dstrArray[4] = ddArray[0];

					dstrArray[5] = ddArray[1];

					dstrArray[0] = ddArray[2];

					dstrArray[1] = ddArray[3];

					dstrArray[2] = ddArray[4];

					dstrArray[3] = ddArray[5];

					read = 50;

				}

				ByteBuffer bb = ByteBuffer.wrap(dstrArray);

				bb.order(ByteOrder.LITTLE_ENDIAN);

				val = bb.getDouble();

			}

		}

		ArrayList v = new ArrayList();

		v.add(new Integer(offset + read));

		v.add(new Double(val));

		return v;

	}

	/**

	 * Read a double value from a group of unsigned bytes

	 *

	 * @param data Array of unsigned bytes obtained from the DWG binary file

	 * @param offset The current bit offset where the value begins

	 * @throws RuntimeException If an unexpected bit value is found in the DWG file. Occurs

	 *             when we are looking for LwPolylines.

	 * @return ArrayList This ArrayList has two parts. First is an int value that represents

	 * 		   the new offset, and second is the double value

	 */

	public static ArrayList getBitDouble(int[] data, int offset) throws RuntimeException {

		ArrayList v = new ArrayList();

		int type = ((Integer) getBits(data, 2, offset)).intValue();

		int read = 2;

		double val = 0.0;

		if (type == 0x00) {

			byte[] bytes = (byte[]) getBits(data, 64, (offset + 2));

			ByteBuffer bb = ByteBuffer.wrap(bytes);

			bb.order(ByteOrder.LITTLE_ENDIAN);

			val = bb.getDouble();

			read = 66;

		} else if (type == 0x01) {

			val = 1.0;

		} else if (type == 0x02) {

			val = 0.0;

		} else {

			System.out.println("Bad type " + type + " at bit offset: " + offset);

		}

		v.add(new Integer(offset + read));

		v.add(new Double(val));

		return v;

	}

	/**

	 * Read a double value from a group of unsigned bytes

	 *

	 * @param data Array of unsigned bytes obtained from the DWG binary file

	 * @param offset The current bit offset where the value begins

	 * @throws RuntimeException If an unexpected bit value is found in the DWG file. Occurs

	 *             when we are looking for LwPolylines.

	 * @return ArrayList This ArrayList has two parts. First is an int value that represents

	 * 		   the new offset, and second is the double value

	 */

	public static ArrayList getRawDouble(int[] data, int offset) throws RuntimeException {

		byte[] bytes = (byte[]) getBits(data, 64, offset);

		ByteBuffer bb = ByteBuffer.wrap(bytes);

		bb.order(ByteOrder.LITTLE_ENDIAN);

		double val = bb.getDouble();

		ArrayList v = new ArrayList();

		v.add(new Integer(offset + 64));

		v.add(new Double(val));

		return v;

	}

	/**

	 * Read a short value from a group of unsigned bytes

	 *

	 * @param data Array of unsigned bytes obtained from the DWG binary file

	 * @param offset The current bit offset where the value begins

	 * @throws RuntimeException If an unexpected bit value is found in the DWG file. Occurs

	 *             when we are looking for LwPolylines.

	 * @return ArrayList This ArrayList has two parts. First is an int value that represents

	 * 		   the new offset, and second is the short value

	 */

	public static ArrayList getBitShort(int[] data, int offset) throws RuntimeException {

		ArrayList v = new ArrayList();

		int type = ((Integer) getBits(data, 2, offset)).intValue();

		int read = 2;

		int val = 0;

		if (type == 0x00) {

			byte[] bytes = (byte[]) getBits(data, 16, (offset + 2));

			ByteBuffer bb = ByteBuffer.wrap(bytes);

			bb.order(ByteOrder.LITTLE_ENDIAN);

			val = bb.getShort();

			read = 18;

		} else if (type == 0x01) {

			val = ((Integer) getBits(data, 8, (offset + 2))).intValue();

			read = 10;

		} else if (type == 0x02) {

			val = 0;

		} else if (type == 0x03) {

			val = 256;

		}

		v.add(new Integer(offset + read));

		v.add(new Integer(val));

		return v;

	}

	/**

	 * Read a short value from a group of unsigned bytes

	 *

	 * @param data Array of unsigned bytes obtained from the DWG binary file

	 * @param offset The current bit offset where the value begins

	 * @throws RuntimeException If an unexpected bit value is found in the DWG file. Occurs

	 *             when we are looking for LwPolylines.

	 * @return ArrayList This ArrayList has two parts. First is an int value that represents

	 * 		   the new offset, and second is the short value

	 */

	public static ArrayList getRawShort(int[] data, int offset) throws RuntimeException {

		byte[] bytes = (byte[]) getBits(data, 16, offset);

		ByteBuffer bb = ByteBuffer.wrap(bytes);

		bb.order(ByteOrder.LITTLE_ENDIAN);

		int val = bb.getShort();

		ArrayList v = new ArrayList();

		v.add(new Integer(offset + 16));

		v.add(new Integer(val));

		return v;

	}

	/**

	 * Read a long value from a group of unsigned bytes

	 *

	 * @param data Array of unsigned bytes obtained from the DWG binary file

	 * @param offset The current bit offset where the value begins

	 * @throws RuntimeException If an unexpected bit value is found in the DWG file. Occurs

	 *             when we are looking for LwPolylines.

	 * @return ArrayList This ArrayList has two parts. First is an int value that represents

	 * 		   the new offset, and second is the long value

	 */

	public static ArrayList getBitLong(int[] data, int offset) throws RuntimeException {

		int type = ((Integer) getBits(data, 2, offset)).intValue();

		int read = 2;

		int val = 0;

		if (type == 0x0) {

			byte[] bytes = (byte[]) getBits(data, 32, (offset + 2));

			ByteBuffer bb = ByteBuffer.wrap(bytes);

			bb.order(ByteOrder.LITTLE_ENDIAN);

			val = bb.getInt();

			read = 34;

		} else if (type == 0x01) {

			val = ((Integer) getBits(data, 8, (offset + 2))).intValue();

			read = 10;

		} else if (type == 0x02) {

			val = 0;

		} else {

			System.out.println("Bad type at bit offset: " + offset);

		}

		ArrayList v = new ArrayList();

		v.add(new Integer(offset + read));

		v.add(new Integer(val));

		return v;

	}

	/**

	 * Read a long value from a group of unsigned bytes

	 *

	 * @param data Array of unsigned bytes obtained from the DWG binary file

	 * @param offset The current bit offset where the value begins

	 * @throws RuntimeException If an unexpected bit value is found in the DWG file. Occurs

	 *             when we are looking for LwPolylines.

	 * @return ArrayList This ArrayList has two parts. First is an int value that represents

	 * 		   the new offset, and second is the long value

	 * @throws RuntimeException

	 */

	public static ArrayList getRawLong(int[] data, int offset) throws RuntimeException {

		ArrayList v = new ArrayList();

		// _val = struct.unpack('<l', _long)[0]

		byte[] bytes = (byte[]) getBits(data, 32, offset);

		ByteBuffer bb = ByteBuffer.wrap(bytes);

		bb.order(ByteOrder.LITTLE_ENDIAN);

		int val = bb.getInt();

		v.add(new Integer(offset + 32));

		v.add(new Integer(val));

		return v;

	}

	/**

	 * Read a char value from a group of unsigned bytes

	 *

	 * @param data Array of unsigned bytes obtained from the DWG binary file

	 * @param offset The current bit offset where the value begins

	 * @throws RuntimeException If an unexpected bit value is found in the DWG file. Occurs

	 *             when we are looking for LwPolylines.

	 * @return ArrayList This ArrayList has two parts. First is an int value that represents

	 * 		   the new offset, and second is the char value

	 */

	public static ArrayList getRawChar(int[] data, int offset) throws RuntimeException {

		int charr = ((Integer) getBits(data, 8, offset)).intValue();

		ArrayList v = new ArrayList();

		v.add(new Integer(offset + 8));

		v.add(new Integer(charr));

		return v;

	}

	/**

	 * Read a char value from a group of unsigned bytes

	 *

	 * @param data Array of unsigned bytes obtained from the DWG binary file

	 * @param offset The current bit offset where the value begins

	 * @throws RuntimeException If an unexpected bit value is found in the DWG file. Occurs

	 *             when we are looking for LwPolylines.

	 * @return ArrayList This ArrayList has two parts. First is an int value that represents

	 * 		   the new offset, and second is the char value

	 */

	public static ArrayList getModularChar(int[] data, int offset) throws RuntimeException {

		int val = 0;

		ArrayList bytes = new ArrayList();

		boolean read = true;

		int offsett = offset;

		int fac = 1;

		while (read) {

			int bytee = ((Integer) getBits(data, 8, offsett)).intValue();

			offsett = offsett + 8;

			if ((bytee & 0x80) == 0) {

				read = false;

				if ((bytee & 0x40) > 0) {

					fac = -1;

					bytee = bytee & 0xbf;

				}

			}

			bytes.add(new Integer(bytee & 0x7f));

		}

		if (bytes.size()==1) val = ((Integer)bytes.get(0)).intValue();

		else if (bytes.size()==2) val = ((Integer)bytes.get(0)).intValue() | (((Integer)bytes.get(1)).intValue() << 7);

		else if (bytes.size()==3) val = ((Integer)bytes.get(0)).intValue() | (((Integer)bytes.get(1)).intValue() << 7) | (((Integer)bytes.get(2)).intValue() << 14);

		else if (bytes.size()==4) val = ((Integer)bytes.get(0)).intValue() | (((Integer)bytes.get(1)).intValue() << 7) | (((Integer)bytes.get(2)).intValue() << 14) | (((Integer)bytes.get(3)).intValue() << 21);

		else System.out.println("Unexpected byte array length: " + bytes.size());

		ArrayList v = new ArrayList();

		v.add(new Integer(offsett));

		v.add(new Integer(fac * val));

		return v;

	}

	/**

	 * Read a String from a group of unsigned bytes

	 *

	 * @param data Array of unsigned bytes obtained from the DWG binary file

	 * @param offset The current bit offset where the value begins

	 * @throws RuntimeException If an unexpected bit value is found in the DWG file. Occurs

	 *             when we are looking for LwPolylines.

	 * @return ArrayList This ArrayList has two parts. First is an int value that represents

	 * 		   the new offset, and second is the String

	 */

	public static ArrayList getTextString(int[] data, int offset) throws RuntimeException {

		int bitPos = offset;

		ArrayList bitShort = DwgUtil.getBitShort(data, bitPos);

		int newBitPos = ((Integer) bitShort.get(0)).intValue();

		int len = ((Integer) bitShort.get(1)).intValue();

		bitPos = newBitPos;

		int bitLen = len * 8;

		Object cosa = DwgUtil.getBits(data, bitLen, bitPos);

		String string;

		if (cosa instanceof byte[]) {

			string = new String((byte[]) cosa);

		} else {

			// string = ((Integer)cosa).toString();

			byte[] bytes = new byte[] { ((Integer) cosa).byteValue() };

			string = new String((byte[]) bytes);

		}

		bitPos = bitPos + bitLen;

		ArrayList v = new ArrayList();

		v.add(new Integer(bitPos));

		v.add(string);

		return v;

	}

	/**

	 * Read a CmColor from a group of unsigned bytes

	 *

	 * @param data

	 *            Array of unsigned bytes obtained from the DWG binary file

	 * @param offset

	 *            The current bit offset where the value begins

	 * @throws RuntimeException

	 *             If an unexpected bit value is found in the DWG file. Occurs

	 *             when we are looking for LwPolylines.

	 * @return ArrayList This ArrayList has two parts. First is an int value

	 *         that represents the new offset, and second is the int value

	 *         (handle of a DWG object)

	 */

	public static ArrayList getCmColor(int[] intData, int offset, String version) throws RuntimeException {

		ArrayList v = new ArrayList();

		int bitPos = offset;

		List val = getBitShort(intData, bitPos);

		bitPos = ((Integer) val.get(0)).intValue();

		v.add((Integer) val.get(1));		//color index

		//FIXME: para versiones superiores habrá que ampliar la condición

		if (version.equalsIgnoreCase("Autocad R2004, R2005, R2006")){

			val = getBitLong(intData, bitPos);

			bitPos = ((Integer) val.get(0)).intValue();

			v.add((Integer) val.get(1));	//RGB value

			val = getRawChar(intData, bitPos);

			bitPos = ((Integer) val.get(0)).intValue();

			Integer colorByte = ((Integer) val.get(1)); //.intValue();

			v.add(colorByte);				//Color Byte

			// Según la documentacion:

			// Color Byte & 1 ==> color name follows

			// Color Byte & 2 ==> book name follows

			if (((colorByte.intValue() & 0x01) != 0) || ((colorByte.intValue() & 0x02) != 0)) {

				val = getTextString(intData, bitPos);

				bitPos = ((Integer) val.get(0)).intValue();

				v.add(val.get(1));//color name or book name

			} else {

				v.add("");//color name or book name

			}

		}

		v.add(0, new Integer(bitPos));

		return v;

	}

	/**

	 * Read a int value (the handle of a DWG object) from a group of unsigned

	 * bytes

	 *

	 * @param data

	 *            Array of unsigned bytes obtained from the DWG binary file

	 * @param offset

	 *            The current bit offset where the value begins

	 * @throws RuntimeException

	 *             If an unexpected bit value is found in the DWG file. Occurs

	 *             when we are looking for LwPolylines.

	 * @return ArrayList This ArrayList has two parts. First is an int value

	 *         that represents the new offset, and second is the int value

	 *         (handle of a DWG object)

	 */

	public static ArrayList getHandle(int[] data, int offset)

			throws RuntimeException {

		ArrayList v = new ArrayList();

		int code = ((Integer) DwgUtil.getBits(data, 4, offset)).intValue();

	    int counter = ((Integer)DwgUtil.getBits(data, 4, (offset + 4))).intValue();

		int read = 8;

		ArrayList hlist = new ArrayList();

		if (counter > 0) {

			int hlen = counter * 8;

			Object handle = DwgUtil.getBits(data, hlen, (offset + 8));

			read = read + hlen;

			if (hlen > 8) {

				byte[] handleBytes = (byte[]) handle;

				int[] handleInts = new int[handleBytes.length];

				// Hacerlos unsigned ...

				for (int i = 0; i < handleBytes.length; i++) {

					handleInts[i] = ByteUtils.getUnsigned(handleBytes[i]);

				}

				for (int i = 0; i < handleInts.length; i++) {

					hlist.add(new Integer(handleInts[i]));

				}

			} else {

				hlist.add(handle);

			}

		}

		v.add(new Integer(offset + read));

		v.add(new Integer(code));

		v.add(new Integer(counter));

		for (int i = 0; i < hlist.size(); i++) {

			v.add(hlist.get(i));

		}

		return v;

	}

	/**

	 * Read a int value (the size of a modular short) from a ByteBuffer

	 *

	 * @param bb Data given as a ByteBuffer

	 * @return int Size of the modular short

	 */

	public static int getModularShort(ByteBuffer bb) {

		ArrayList shorts = new ArrayList();

		bb.order(ByteOrder.BIG_ENDIAN);

		short shortt = bb.getShort();

		int size = 0;

		while ((shortt & 0x80) > 0) {

			shorts.add(new Short(shortt));

			shortt = bb.getShort();

		}

		shorts.add(new Short(shortt));

		for (int i = 0; i < shorts.size(); i++) {

			shortt = ((Short) shorts.get(i)).shortValue();

			shorts.set(i, new Integer(((shortt & 0xff00) >> 8) | ((shortt & 0xff) << 8)));

		}

		int slen = shorts.size();

		if (slen == 1) {

			size = (((Integer)shorts.get(0)).intValue()) & 0x7fff;//(new Integer(((Integer)shorts.get(0)).shortValue() & 0x7fff)).byteValue();

		} else if (slen == 2) {

			int tmp = ((Integer) shorts.get(0)).intValue();

			shorts.set(0, shorts.get(1));

			shorts.set(1, new Integer(tmp));

			size = (((((Integer)shorts.get(0)).intValue()) & 0x7fff) << 15) | (((((Integer)shorts.get(1)).intValue()) & 0x7fff));//(new Integer(((Integer)shorts.get(0)).shortValue() & 0x7fff)).byteValue();

		} else {

			System.out.println("Unexpected array length: " + slen);

		}

		return size;

	}

	/**

	 * Returns a set of bits from a group of unsigned bytes

	 *

	 * @param data Array of unsigned bytes obtained from the DWG binary file

	 * @param count Bit counter

	 * @param offset The current bit offset where the value begins

	 * @throws RuntimeException If an unexpected bit value is found in the DWG file. Occurs

	 *             when we are looking for LwPolylines.

	 * @return This method returns an array of bytes or an int value

	 */

	public static Object getBits(int[] data, int count, int offset) throws RuntimeException {

		int idx = offset / 8;

		int bitidx = offset % 8;

		/**

		 * mask1: bit mask to apply to the current byte

		 * lshift: left shift amount of mask results

		 * mask2: bit mask to apply to the next byte

		 * rshift: right shift amount of the mask results

		 */

		int[][] maskTable = new int[][]{

		    {0xff, 0, 0x00, 0}, // bit offset == 0

				{ 0x7f, 1, 0x80, 7 }, // bit offset == 1

				{ 0x3f, 2, 0xc0, 6 }, // bit offset == 2

				{ 0x1f, 3, 0xe0, 5 }, // bit offset == 3

				{ 0x0f, 4, 0xf0, 4 }, // bit offset == 4

				{ 0x07, 5, 0xf8, 3 }, // bit offset == 5

				{ 0x03, 6, 0xfc, 2 }, // bit offset == 6

				{ 0x01, 7, 0xfe, 1 }, // bit offset == 7

		};

		int mask1 = maskTable[bitidx][0];

		int lsh = maskTable[bitidx][1];

		int mask2 = maskTable[bitidx][2];

		int rsh = maskTable[bitidx][3];

		int binc = 8 - bitidx;

		int read = 0;

		int rem = count;

		int bytee = 0x0;

		ArrayList bytes = new ArrayList();

		while (read < count) {

			int b1 = 0;

			if (rem > binc) {

				b1 = (data[idx] & mask1);

				read = read + binc;

				rem = rem - binc;

			} else {

				b1 = ((data[idx] & mask1) >> (8 - bitidx - rem));

				bytee = b1;

				read = read + rem;

				rem = 0;

			}

			if (read < count) {

				idx = idx + 1;

				if (rem > bitidx) {

					int b2 = (data[idx] & mask2);

					bytee = (b1 << lsh) | (b2 >> rsh);

					read = read + bitidx;

					rem = rem - bitidx;

				} else {

					int mask = maskTable[rem][2];

					int b2 = data[idx] & mask;

					bytee = (b1 << rem) | (b2 >> (8 - rem));

					read = read + rem;

					rem = 0;

				}

			}

			if (count > 8) {

				bytes.add(new Integer(bytee));

			}

		}

		if (bytes.size() > 0) {

			byte[] newBytes = new byte[bytes.size()];

			for (int i = 0; i < newBytes.length; i++) {

				newBytes[i] = ((Integer) bytes.get(i)).byteValue();

			}

			return newBytes;

		}

		return new Integer(bytee);

	}

	/**

	 * Test a bit obtained from a set of unsigned bytes

	 *

	 * @param data Array of unsigned bytes obtained from the DWG binary file

	 * @param offset The current bit offset where the value begins

	 * @return ArrayList This ArrayList has two parts. First is an int value that represents

	 * 		   the new offset, and second is a bit flag

	 */

	public static ArrayList testBit(int[] data, int offset) {

		int idx = offset / 8;

		int bitidx = offset % 8;

		int mask = 0x1 << (7 - bitidx);

		boolean val = false;

		if ((data[idx] & mask) > 0) val = true;

		ArrayList v = new ArrayList();

		v.add(new Integer(offset + 1));

		v.add(new Boolean(val));

		return v;

	}

	/**

	 * Convert bytes to machine value bytes

	 *

	 * @param data Input of array of bytes

	 * @return int[] Output of array of machine bytes

	 */

	public static int[] bytesToMachineBytes(byte[] data) {

		String[] dataString = new String[data.length];

		int[] dataOut = new int[data.length];

		for (int i = 0; i < data.length; i++) {

			dataString[i] = HexUtil.bytesToHex(new byte[] { data[i] });

			Integer dataInt = Integer.decode("0x" + dataString[i]);

			dataOut[i] = dataInt.intValue();

		}

		return dataOut;

	}

	/**

	 * It receives the list procedent from getHandle method, and return the

	 * handle as int

	 *

     * */

	public static int handleToInt(List fromGetHandle) {

		int[] handle = new int[fromGetHandle.size() - 1];

		for (int j = 1; j < fromGetHandle.size(); j++) {

			handle[j - 1] = ((Integer) fromGetHandle.get(j)).intValue();

		}

		ArrayList handleVect = new ArrayList();

		for (int i = 0; i < handle.length; i++) {

			handleVect.add(new Integer(handle[i]));

		}

		return DwgUtil.handleBinToHandleInt(handleVect);

    }

	/**

	 * Obtain the int value of a handle given in binary format

	 *

	 * @param layerHandle Handle in binary format

	 * @return int Int value of the handle

	 */

	public static int handleBinToHandleInt(ArrayList layerHandle) {

		byte[] layerBytes = new byte[] { 0, 0, 0, 0 };

		if (layerHandle.size()>2) layerBytes[3] = (byte)((Integer)layerHandle.get(2)).intValue();

		if (layerHandle.size() > 3) {

			layerBytes[3] = (byte) ((Integer) layerHandle.get(3)).intValue();

			layerBytes[2] = (byte) ((Integer) layerHandle.get(2)).intValue();

		}

		if (layerHandle.size() > 4) {

			layerBytes[3] = (byte) ((Integer) layerHandle.get(4)).intValue();

			layerBytes[2] = (byte) ((Integer) layerHandle.get(3)).intValue();

			layerBytes[1] = (byte) ((Integer) layerHandle.get(2)).intValue();

		}

		if (layerHandle.size() > 5) {

			layerBytes[3] = (byte) ((Integer) layerHandle.get(5)).intValue();

			layerBytes[2] = (byte) ((Integer) layerHandle.get(4)).intValue();

			layerBytes[1] = (byte) ((Integer) layerHandle.get(3)).intValue();

			layerBytes[0] = (byte) ((Integer) layerHandle.get(2)).intValue();

		}

		int layer = ByteUtils.bytesToInt(layerBytes, new int[] { 0 });

		return layer;

	}

	/*

	 * TODO Ver si esto es necesario

	 * */

	public static int[] toIntArray(byte[] bytes) {

		String[] dataMachValString = new String[bytes.length];

		int[] data = new int[bytes.length];

		for (int i = 0; i < bytes.length; i++) {

			dataMachValString[i] = HexUtil.bytesToHex(new byte[] { bytes[i] });

			Integer dataMachValShort = Integer.decode("0x" + dataMachValString[i]);

			data[i] = dataMachValShort.byteValue();

			data[i] = ByteUtils.getUnsigned((byte) data[i]);

		}// for

		return data;

	}

}

/*

 * Created on 09-ene-2007

 *

 * gvSIG. Sistema de Informaci�n Geogr�fica de la Generalitat Valenciana

 *

 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib��ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

/* CVS MESSAGES:

*

* $Id: IDwg2FMap.java 29001 2009-05-26 15:32:46Z jmvivo $

* $Log$

* Revision 1.2.2.2  2007-03-21 19:49:16  azabala

* implementation of dwg 12, 13, 14.

*

* Revision 1.3  2007/03/20 19:55:27  azabala

* source code cleaning

*

* Revision 1.2  2007/01/18 13:35:22  azabala

* Refactoring general para evitar dar tantas pasadas en la carga, y para incrementar

* la legibilidad del codigo (demasiados if-else-if en vez de usar polimorfismo)

*

* Revision 1.1  2007/01/12 19:29:58  azabala

* first version in cvs

*

*

*/

package org.gvsig.dwg.lib;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.exception.CreateGeometryException;

/**

 * All dwg objects that are drawing entities

 * and that can be converted to a fmap geometry

 * implements this interface.

 *

 * */

/*

 * TODO

 * Esta solucion tiene el problema de que es mas simple

 * (cada entidad dwg se ocupa de su conversion a fmap),pero acopla

 * libDwg con fmap

 * (una clase Dwg2FMap lo desacoplar�a, pero llenar�a el codigo de

 * infinitos if(dwg instanceof ...) else if.....

 *

 * */

public interface IDwg2FMap {

	public Geometry toFMapGeometry(boolean is3DFile) throws CreateGeometryException;

	public String toFMapString(boolean is3DFile);

	public int getGeometryType();

	public int getGeometrySubType(boolean is3DFile);

	public String toString();

}

/* jdwglib. Java Library for reading Dwg files.

 *

 * Author: Jose Morell Rama (jose.morell@gmail.com).

 * Port from the Pythoncad Dwg library by Art Haas.

 *

 * Copyright (C) 2005 Jose Morell, IVER TI S.A. and Generalitat Valenciana

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 * Jose Morell (jose.morell@gmail.com)

 *

 * or

 *

 * IVER TI S.A.

 *  C/Salamanca, 50

 *  46005 Valencia

 *  Spain

 *  +34 963163400

 *  dac@iver.es

 */

package org.gvsig.dwg.lib;

import java.awt.geom.Point2D;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import org.gvsig.dwg.lib.objects.DwgBlockHeader;

import org.gvsig.dwg.lib.objects.DwgInsert;

import org.gvsig.dwg.lib.objects.DwgLayer;

import org.gvsig.dwg.lib.readers.DwgFileV12Reader;

import org.gvsig.dwg.lib.readers.DwgFileV14Reader;

import org.gvsig.dwg.lib.readers.DwgFileV15Reader;

import org.gvsig.dwg.lib.readers.DwgFileVR2004Reader;

import org.gvsig.dwg.lib.readers.IDwgFileReader;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * The DwgFile class provides a revision-neutral interface for reading and handling

 * DWG files

 * Reading methods are useful for reading DWG files, and handling methods like

 * calculateDwgPolylines() are useful for handling more complex

 * objects in the DWG file

 *

 * @author jmorell

 * @author azabala

 */

public class DwgFile {

	/**

	 * It has all known DWG version's header.

	 * Extracted from Autodesk web.

	 */

	private static HashMap acadVersions = new HashMap();

	static{

		acadVersions.put("AC1004", "Autocad R9");

		acadVersions.put("AC1006", "Autocad R10");

		acadVersions.put("AC1007", "Autocad pre-R11");

		acadVersions.put("AC1007", "Autocad pre-R11");

		acadVersions.put("AC1008", "Autocad pre-R11b");

		acadVersions.put("AC1009", "Autocad R12");

		acadVersions.put("AC1010", "Autocad pre-R13 a");

		acadVersions.put("AC1011", "Autocad pre-R13 b");

		acadVersions.put("AC1012", "Autocad R13");

		acadVersions.put("AC1013", "Autocad pre-R14");

		acadVersions.put("AC1014", "Autocad R14");

		acadVersions.put("AC1500", "Autocad pre-2000");

		acadVersions.put("AC1015", "Autocad R2000, R2000i, R2002");

		acadVersions.put("AC402a", "Autocad pre-2004a");

		acadVersions.put("AC402b", "Autocad pre-2004b");

		acadVersions.put("AC1018", "Autocad R2004, R2005, R2006");

		acadVersions.put("AC1021", "Autocad R2007");

	}

	private static Logger logger = LoggerFactory.getLogger(DwgFile.class.getName());

	/**

	 * Path and name of the dwg file

	 * */

	private String fileName;

	/**

	 * DWG version of the file (AC1013, AC1018, etc.)

	 * */

	private String dwgVersion;

	/**

	 * Offsets to the DWG sections

	 */

	private ArrayList dwgSectionOffsets;

	/**

	 * Header vars readed from the HEADER section of the DWG file

	 * */

	private Map headerVars;

	/**

	 * This list contains what in OpenDWG specification is called

	 * the object map ( a collection of entries where each entry contains

	 * the seek of each object, and its size)

	 * */

	private ArrayList dwgObjectOffsets;

	/**

	 * For each entry in dwgObjectOffsets, we have an instance of

	 * DwgObject in the dwgObjects collection

	 *

	 * */

	private List dwgObjects;

	private HashMap handle_objects;

	private ArrayList dwgClasses;

	/**

	 * hash map that indexes all DwgLayer objects

	 * by its handle property

	 * */

	private HashMap layerTable;

	/**

	 * Specific reader of the DWG file version (12, 13, 14, 2000, etc., each

	 * version will have an specific reader)

	 * */

	private IDwgFileReader dwgReader;

	private boolean dwg3DFile = false;

	/**

	 * Memory mapped byte buffer of the whole DWG file

	 * */

	private ByteBuffer bb;

	/*

	 * Optimizaciones para evitar leer el fichero completo en cada

	 * pasada.

	 * */

	/**

	 * Contains all IDwgPolyline implementations

	 * */

	private List dwgPolylines;

	/**

	 * Contains all INSERT entities of the dwg file

	 * (these entities must be processed in a second pass)

	 *

	 * */

	private List insertList;

	private List blockList;

	/**

	 * Constructor.

	 * @param fileName an absolute path to the DWG file

	 */

	public DwgFile(String fileName) {

		this.fileName = fileName;

		dwgSectionOffsets = new ArrayList();

		dwgObjectOffsets = new ArrayList();

		headerVars = new HashMap();

		dwgClasses = new ArrayList();

		dwgObjects = new ArrayList();

		handle_objects = new HashMap();

		layerTable = new HashMap();

		dwgPolylines = new ArrayList();

		insertList = new ArrayList();

		blockList = new ArrayList();

	}

	public String getDwgVersion() {

		return dwgVersion;

	}

	/**

	 * Reads a DWG file and put its objects in the dwgObjects Vector

	 * This method is version independent

	 *

	 * @throws IOException If the file location is wrong

	 */

	public void read() throws IOException,

				DwgVersionNotSupportedException

	{

		setDwgVersion();

		if (dwgVersion.equalsIgnoreCase("Autocad R2000, R2000i, R2002")) {

			dwgReader = new DwgFileV15Reader();

		}else if (dwgVersion.equalsIgnoreCase("Autocad pre-R14")||

				dwgVersion.equalsIgnoreCase("Autocad R14") ||

				dwgVersion.equalsIgnoreCase("Autocad R13")) {

			dwgReader = new DwgFileV14Reader();

		}else if (dwgVersion.equalsIgnoreCase("Autocad R2004, R2005, R2006")){

			dwgReader = new DwgFileVR2004Reader();

		} else if (dwgVersion.equalsIgnoreCase("Autocad R12")||

				dwgVersion.equalsIgnoreCase("Autocad pre-R13 a") ||

				dwgVersion.equalsIgnoreCase("Autocad pre-R13 b")) {

			boolean isR13 = true;

			if(dwgVersion.equalsIgnoreCase("Autocad R12"))

					isR13 = false;

			dwgReader = new DwgFileV12Reader(isR13);

		}else {

			DwgVersionNotSupportedException exception =

				new DwgVersionNotSupportedException("Version de DWG no soportada");

			exception.setDwgVersion(dwgVersion);

			throw exception;

		}

		try{

		dwgReader.read(this, bb);

		}catch(Throwable t){

			t.printStackTrace();

			throw new IOException("Error leyendo dwg");

		}

	}

	private void setDwgVersion() throws IOException {

		File file = new File(fileName);

		FileInputStream fileInputStream = new FileInputStream(file);

		FileChannel fileChannel = fileInputStream.getChannel();

		long channelSize = fileChannel.size();

		bb = fileChannel.map(FileChannel.MapMode.READ_ONLY, 0, channelSize);

		byte[] versionBytes = {bb.get(0),

								bb.get(1),

								bb.get(2),

								bb.get(3),

								bb.get(4),

								bb.get(5)};

		ByteBuffer versionByteBuffer = ByteBuffer.wrap(versionBytes);

		String[] bs = new String[versionByteBuffer.capacity()];

		String versionString = "";

		for (int i=0; i<versionByteBuffer.capacity(); i++) {

			bs[i] = new String(new byte[]{(byte)(versionByteBuffer.get(i))});

			versionString = versionString + bs[i];

		}

		String version = (String) acadVersions.get(versionString);

		if(version == null)

			version = "Unknown Dwg format";

		this.dwgVersion = version;

	}

	public void setHeader(String key, Object value){

		headerVars.put(key, value);

	}

	public Object getHeader(String key){

		return headerVars.get(key);

	}

	/*

	 * A DwgLayer is a DWG drawing entity, so all DwgLayer objects are

	 * saved in dwgObjects collection.

	 * Instead of iterate over the full collection, is faster check every object

	 * and save all the DwgLayer instances in their own collection.

	 *

	 */

	protected void addDwgLayer(DwgLayer dwgLayer){

		layerTable.put(new Integer(dwgLayer.getHandle().getOffset()),

				dwgLayer);

	}

	private void printInfoOfAObject (DwgObject entity){

		logger.info("index = "+entity.getIndex() + " entity.type = " + entity.type + " entityClassName = "+ entity.getClass().getName());

		logger.info("handleCode = "+entity.getHandle().getCode());

		logger.info("entityLayerHandle = "+entity.getHandle().getOffset());

		if(entity.hasLayerHandle()){

			logger.info("layerHandleCode = "+entity.getLayerHandle().getCode());

			logger.info("layerHandle = "+entity.getLayerHandle().getOffset());

		}

		if(entity.hasSubEntityHandle()){

			logger.info("subEntityHandleCode = "+entity.getSubEntityHandle().getCode());

			logger.info("subEntityHandle = "+entity.getSubEntityHandle().getOffset());

		}

		if(entity.hasNextHandle()){

			logger.info("nextHandleCode = "+entity.getNextHandle().getCode());

			logger.info("nextHandle = "+entity.getNextHandle().getOffset());

		}

		if(entity.hasPreviousHandle()){

			logger.info ("previousHandleCode = "+entity.getPreviousHandle().getCode());

			logger.info ("previousHandle = "+entity.getPreviousHandle().getOffset());

		}

		if(entity.hasXDicObjHandle()){

			logger.info ("xDicObjHandleCode = "+entity.getXDicObjHandle());

			logger.info ("xDicObjHandle = "+entity.getXDicObjHandle());

		}

		if(entity.hasReactorsHandles()){

			ArrayList reactorsHandles = entity.getReactorsHandles();

			int size = reactorsHandles.size();

			logger.info ("NUMERO DE reactors = "+size);

			DwgHandleReference hr;

			for(int i=0; i<size; i++){

				hr=(DwgHandleReference)reactorsHandles.get(i);

				logger.info ("reactorHandleCode = "+hr.getCode());

				logger.info (" reactorHandle = "+hr.getOffset());

			}

		}

	}

	public DwgLayer getDwgLayer(DwgObject entity){

		DwgHandleReference handle = entity.getLayerHandle();

		if(handle == null){

			return null;

		}

		int	handleCode = handle.getCode();

		int	entityLayerHandle = entity.getLayerHandle().getOffset();

		int layerHandle = -1;

		int entityRecord;

		DwgObject object;

		/*

		 * OpenDWG spec, v3, page 11. HANDLE REFERENCES

		 *

		 * A handle is formed by this fields:

		 * a) CODE (4 bits)

		 * b) COUNTER (4 bits)

		 * c) OFFSET of the object (handle itself).

		 *

		 * CODE could take these values:

		 * 1) 0x2, 0x3, 0x4, 0x5 -> offset is the handle of the layer

		 * 2) 0x6 -> offset is the next object handle

		 * 3) 0x8 -> offset is the previous object handle

		 * 4) 0xA -> result is reference handle plus offset

 		 * 5) 0xC -> result is reference handle minus offset

		 *

		 * */

		// FIXME: Esto no esta terminado. Falta considerar los codigo

		// 0x2, 0x3, 0x6, 0xA que no han aparecido en los archivos de prueba.

		switch(handleCode){

		case 0x4:

			if (entity.hasNextHandle()){

				int nextHandleCode = entity.getNextHandle().getCode();

				if (nextHandleCode == 0x5) {

					layerHandle = entity.getNextHandle().getOffset();

				} else {

					//TODO: No se han previsto nextHandleCode != 0x5

//					System.out.println ("DwgFile.getDwgLayer: handleCode "+handleCode+

//							" con nextHandleCode "+ nextHandleCode +" no implementado.");

				}

			} else {

				layerHandle = entity.getLayerHandle().getOffset();

			}

			break;

		case 0x5:

			layerHandle = entity.getLayerHandle().getOffset();

			break;

		case 0x8:

			if (entity.hasNextHandle()){

				int nextHandleCode = entity.getNextHandle().getCode();

				if (nextHandleCode == 0x5) {

					layerHandle = entity.getNextHandle().getOffset();

				} else {

					//TODO No se han previsto nextHandleCode != 0x5

//					System.out.println ("DwgFile.getDwgLayer: handleCode "+handleCode+

//							" con nextHandleCode "+ nextHandleCode +" no implementado.");

				}

			} else {

				layerHandle = entity.getHandle().getOffset() - 1;

			}

			break;

		case 0xC:

			if (entity.hasNextHandle()){

				int nextHandleCode = entity.getNextHandle().getCode();

				if (nextHandleCode == 0x5) {

					layerHandle = entity.getNextHandle().getOffset();

				} else {

					//TODO: No se han previsto nextHandleCode != 0x5

//					System.out.println ("DwgFile.getDwgLayer: handleCode "+handleCode+

//							" con nextHandleCode "+ nextHandleCode +" no implementado.");

				}

			} else {

				layerHandle = entity.getHandle().getOffset() - entity.getLayerHandle().getOffset() + 1;

			}

			break;

		default:

//			System.out.println ("DwgFile.getDwgLayer: handleCode "+handleCode+" no implementado. entityLayerHandle="+entityLayerHandle);

		}

		if(layerHandle != -1){

			Iterator lyrIterator = layerTable.values().iterator();

			while(lyrIterator.hasNext()){

				DwgLayer lyr = (DwgLayer) lyrIterator.next();

				int lyrHdl = lyr.getHandle().getOffset();

				if (lyrHdl == layerHandle){

					return lyr;

				}

			}

		}

//		System.out.println("NO SE HA ENCONTRADO UNA CAPA CON HANDLE " + layerHandle);

//		printInfoOfAObject(entity);

		return null;

	}

	public DwgObject getDwgSuperEntity(DwgObject entity) {

		if(entity.hasSubEntityHandle()){

			int handleCode = entity.subEntityHandle.getCode();

			int offset = entity.subEntityHandle.getOffset();

			int handle = -1;

			DwgObject object;

			switch(handleCode){

			// TODO: case 0x2:

			// TODO: case 0x3:

			case 0x4:

			case 0x5:

				handle = offset;

				break;

			// TODO: case 0x6:

			case 0x8:

				handle=entity.getHandle().getOffset() - 1;

				break;

			case 0xA:

				handle = entity.getHandle().getOffset() + offset;

				break;

			case 0xC:

				handle = entity.getHandle().getOffset() - offset;

				break;

			default:

				logger.warn ("DwgObject.getDwgSuperEntity: handleCode "+handleCode+" no implementado. offset = "+offset);

			}

			if(handle != -1){

				object = getDwgObjectFromHandle(handle);

				if(object != null)

					return object;

			}

		}

		return null;

	}

	public String getLayerName(DwgObject entity) {

		DwgLayer dwgLayer = getDwgLayer(entity);

		if(dwgLayer == null){

			return "";

		}else{

			return dwgLayer.getName();

		}

	}

	/**

     * Returns the color of the layer of a DWG object

	 *

     * @param entity DWG object which we want to know its layer color

	 * @return int Layer color of the DWG object in the Autocad color code

	 */

	public int getColorByLayer(DwgObject entity) {

		int colorByLayer;

		DwgLayer dwgLyr = getDwgLayer(entity);

		if(dwgLyr == null)

			colorByLayer = 0;

		else

			colorByLayer = dwgLyr.getColor();

		return colorByLayer;

	}

	/**

	 * Configure the geometry of the polylines in a DWG file from the vertex list in

	 * this DWG file. This geometry is given by an array of Points.