gvSIG projects pool

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package org.gvsig.topology.lib.spi;

import java.io.File;

import java.io.InputStream;

import java.net.MalformedURLException;

import java.net.URL;

import java.util.List;

import java.util.Locale;

import java.util.logging.Level;

import org.apache.commons.io.IOUtils;

import org.apache.commons.lang3.StringUtils;

import org.json.JSONArray;

import org.json.JSONObject;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 *

 * @author jjdelcerro

 */

@SuppressWarnings("UseSpecificCatch")

public class RuleResourceLoaderUtils {

    private static Logger LOGGER = LoggerFactory.getLogger(RuleResourceLoaderUtils.class);

    public static URL getRuleURL(String idRule) {

        String lang = Locale.getDefault().getLanguage();

        URL url = RuleResourceLoaderUtils.class.getResource("/org/gvsig/topology/rules/"+lang+"/"+idRule+".json");

        if( url == null ) {

            url = RuleResourceLoaderUtils.class.getResource("/org/gvsig/topology/rules/en/"+idRule+".json");

            if( url == null ) {

                return null;

            }

        }

        return url;

    }

    public static JSONObject getRule(URL url) {

        if( url == null ) {

            return null;

        }

        InputStream is = null;

        JSONObject json;

        try {

            is = url.openStream();

            List<String> lines = IOUtils.readLines(is);

            json = new JSONObject(StringUtils.join(lines,  "\n"));

        } catch (Exception ex) {

            LOGGER.warn("Can't load resource from json file '"+url.toString()+"'.", ex);

            return null;

        } finally {

            IOUtils.closeQuietly(is);

        }

        return json;

    }

    public static JSONObject getRule(String idRuleOrPathname) {

        if( idRuleOrPathname==null ) {

            return null;

        }

        if( idRuleOrPathname.endsWith(".json") ) {

            // Asumimos que es una ruta al fichero json.

            return getRule(new File(idRuleOrPathname));

        }

        // Asumimos que es un ID de regla

        URL url = getRuleURL(idRuleOrPathname);

        if( url == null ) {

            return null;

        }

        return getRule(url);

    }

    public static JSONObject getRule(File jsonfile) {

        if( jsonfile == null || !jsonfile.exists() ) {

            return null;

        }

        try {

            return getRule(jsonfile.toURI().toURL());

        } catch (MalformedURLException ex) {

            LOGGER.warn("Can't load resource from json file '"+jsonfile.toString()+"'.", ex);

            return null;

        }

    }

    public static String getDescription(String idRule, JSONObject json) {

        String description = null;

        if( json.has("description") ) {

            Object x = json.get("description");

            if( x instanceof String ) {

                description = (String) x;

            } else if( x instanceof JSONArray ) {

                StringBuilder builder = new StringBuilder();

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

                    if( i>0 ) {

                        builder.append(" ");

                    }

                    builder.append(((JSONArray)x).getString(i));

                }

                description = builder.toString();

            } else {

                description = x.toString();

            }

            if( description.contains("@@@") ) {

                description = StringUtils.replace(

                        description, 

                        "@@@", 

                        getRuleURL(idRule).toString()

                );

            }

        }

        return description;

    }

    public static JSONObject getAction(JSONObject rule, String idAction) {

        if( !rule.has("actions") ) {

            return null;

        }

        if( !rule.getJSONObject("actions").has(idAction) ) {

            return null;

        }

        JSONObject action = rule.getJSONObject("actions").getJSONObject(idAction);

        return action;

    }

}