gvsig-raster / org.gvsig.raster / branches / org.gvsig.raster.2.4 / org.gvsig.raster / org.gvsig.raster.lib / org.gvsig.raster.lib.buffer / org.gvsig.raster.lib.buffer.impl / src / main / java / org / gvsig / raster / lib / buffer / impl / AbstractPaginatedBand.java @ 6303
History | View | Annotate | Download (4.33 KB)
1 |
package org.gvsig.raster.lib.buffer.impl; |
---|---|
2 |
|
3 |
import java.io.IOException; |
4 |
import java.nio.Buffer; |
5 |
|
6 |
import org.gvsig.raster.lib.buffer.api.Band; |
7 |
import org.gvsig.raster.lib.buffer.api.BandInfo; |
8 |
import org.gvsig.raster.lib.buffer.api.BandNotification; |
9 |
import org.gvsig.raster.lib.buffer.api.BandPageManager; |
10 |
import org.gvsig.raster.lib.buffer.api.BufferLocator; |
11 |
import org.gvsig.raster.lib.buffer.api.NoData; |
12 |
import org.gvsig.raster.lib.buffer.impl.exceptions.CopyFromBandException; |
13 |
|
14 |
/**
|
15 |
* @author fdiaz
|
16 |
*
|
17 |
*/
|
18 |
public abstract class AbstractPaginatedBand extends AbstractBand implements Band{ |
19 |
|
20 |
protected Buffer data; |
21 |
protected int firstRowOfPage; |
22 |
protected int rowsPerPage; |
23 |
protected BandPageManager pageManager;
|
24 |
private boolean loaded; |
25 |
|
26 |
|
27 |
protected static final int MAX_PREFERED_SIZE = 10485760; // 10MB; |
28 |
|
29 |
/**
|
30 |
* @param rows
|
31 |
* @param columns
|
32 |
* @param noData
|
33 |
* @param rowsPerPage
|
34 |
* @param pageManager
|
35 |
*/
|
36 |
public AbstractPaginatedBand(int rows, int columns, NoData noData, BandPageManager pageManager) { |
37 |
this.rows = rows;
|
38 |
this.columns = columns;
|
39 |
this.loaded=false; |
40 |
calculateRowsPerPage(); |
41 |
|
42 |
if (noData == null) { |
43 |
this.noData = BufferLocator.getBufferManager().createNoData(null, null); |
44 |
} else {
|
45 |
this.noData = noData;
|
46 |
} |
47 |
this.pageManager = pageManager;
|
48 |
} |
49 |
|
50 |
private void calculateRowsPerPage(){ |
51 |
rowsPerPage = MAX_PREFERED_SIZE/(this.columns*getDataSize());
|
52 |
if(rowsPerPage<1){ |
53 |
rowsPerPage = 1;
|
54 |
} |
55 |
} |
56 |
|
57 |
/**
|
58 |
* @param value
|
59 |
* @return
|
60 |
*/
|
61 |
protected Object nullValueToNoData(Object value) { |
62 |
if (value == null) { |
63 |
if (getNoData().isDefined()) {
|
64 |
value = getNoData().getValue(); |
65 |
} else {
|
66 |
// Do nothing, no data value is undefined
|
67 |
return null; |
68 |
} |
69 |
} |
70 |
return value;
|
71 |
} |
72 |
|
73 |
@Override
|
74 |
public void copyFrom(Band source) throws CopyFromBandException { |
75 |
doCopyFrom(source); |
76 |
notifyObservers(new DefaultBandNotification(BandNotification.COPY_FROM, new Object[]{source})); |
77 |
} |
78 |
|
79 |
protected void doCopyFrom(Band source) throws CopyFromBandException { |
80 |
if (this.getColumns() != source.getColumns() || this.getRows() != source.getRows() |
81 |
|| this.getDataType()!=source.getDataType() ) {
|
82 |
throw new CopyFromBandException(source, this); |
83 |
} |
84 |
Object rowBuffer = this.createRowBuffer(); |
85 |
for(int row = 0; row<=this.rows; row++){ |
86 |
source.fetchRow(row, rowBuffer); |
87 |
this.putRow(row, rowBuffer);
|
88 |
} |
89 |
} |
90 |
|
91 |
protected void loadPage(int row) { |
92 |
if (loaded && row >= firstRowOfPage
|
93 |
&& row < firstRowOfPage + rowsPerPage) { |
94 |
return;
|
95 |
} |
96 |
loaded=false;
|
97 |
|
98 |
saveCurrentPage(); |
99 |
int currentPage = row / rowsPerPage; //Divisi?n entera |
100 |
firstRowOfPage = currentPage * rowsPerPage; |
101 |
try {
|
102 |
int rowsInPage = rowsPerPage;
|
103 |
if(firstRowOfPage + rowsPerPage > this.rows){ |
104 |
rowsInPage = this.rows - firstRowOfPage;
|
105 |
} |
106 |
this.pageManager.load(data, firstRowOfPage, rowsInPage, this.getDataType()); |
107 |
loaded=true;
|
108 |
} catch (IOException e) { |
109 |
throw new RuntimeException("Can't save current page", e); |
110 |
} |
111 |
} |
112 |
|
113 |
protected void saveCurrentPage() { |
114 |
try {
|
115 |
int rowsInPage = rowsPerPage;
|
116 |
if(firstRowOfPage + rowsPerPage > this.rows){ |
117 |
rowsInPage = this.rows - firstRowOfPage;
|
118 |
} |
119 |
this.pageManager.save(data, firstRowOfPage, rowsInPage, this.getDataType()); |
120 |
} catch (UnsupportedOperationException e) { |
121 |
// Do nothing, operation not supported
|
122 |
} catch (IOException e) { |
123 |
throw new RuntimeException("Can't save current page", e); |
124 |
} |
125 |
} |
126 |
|
127 |
protected abstract int getDataSize(); |
128 |
|
129 |
@Override
|
130 |
public boolean isReadOnly() { |
131 |
if(this.pageManager==null){ |
132 |
return false; |
133 |
} |
134 |
return !this.pageManager.isSupportedSave(); |
135 |
} |
136 |
|
137 |
|
138 |
@Override
|
139 |
public boolean isPaginated() { |
140 |
return true; |
141 |
} |
142 |
|
143 |
@Override
|
144 |
public BandInfo getBandInfo() {
|
145 |
return this.pageManager == null ? null : this.pageManager.getBandInfo(); |
146 |
} |
147 |
|
148 |
} |