Application: gvSIG desktop

package org.gvsig.app.extension;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.nio.charset.Charset;

import java.util.HashMap;

import java.util.Map;

import java.util.Properties;

import java.util.zip.CRC32;

import org.apache.commons.io.FileUtils;

import org.apache.commons.io.IOUtils;

import org.gvsig.andami.PluginServices;

import org.gvsig.andami.PluginsLocator;

import org.gvsig.andami.PluginsManager;

import org.gvsig.fmap.dal.feature.FeatureAttributeDescriptor;

import org.gvsig.fmap.dal.feature.FeatureStore;

import org.gvsig.fmap.dal.feature.FeatureType;

import org.gvsig.fmap.dal.feature.FeatureTypeDefinitionsManager;

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.dynobject.DynClass;

import org.gvsig.tools.dynobject.DynObjectManager;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

public class DefaultFeatureTypeDefinitionsManager implements FeatureTypeDefinitionsManager {

    private static final Logger logger = LoggerFactory.getLogger(DefaultFeatureTypeDefinitionsManager.class);

    private File definitionsFolder = null;

    private final Map<String, DynClass> dynClasses;

    public DefaultFeatureTypeDefinitionsManager() {

        this.dynClasses = new HashMap<>();

    }

    private File getDefinitionsFolder() throws IOException {

        if (this.definitionsFolder == null) {

            PluginsManager pluginManager = PluginsLocator.getManager();

            PluginServices plugin = pluginManager.getPlugin(CreateDefaultFormDefinitionExtension.class);

            File homeFolder = plugin.getPluginHomeFolder();

            File definitionsFolder = new File(homeFolder, "schemas");

            if (!definitionsFolder.exists()) {

                FileUtils.forceMkdir(definitionsFolder);

            }

            this.definitionsFolder = definitionsFolder;

        }

        return this.definitionsFolder;

    }

    private long getCRC(FeatureType type) {

        StringBuilder buffer = new StringBuilder();

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

            FeatureAttributeDescriptor x = type.getAttributeDescriptor(i);

            buffer.append(x.getName());

            buffer.append(x.getDataTypeName());

            buffer.append(x.getSize());

        }

        CRC32 crc = new CRC32();

        byte[] data = buffer.toString().getBytes();

        crc.update(data);

        return crc.getValue();

    }

    private String getKey(FeatureStore store, FeatureType featureType) {

        return store.getName() + "_" + Long.toHexString(getCRC(featureType));

    }

    private File getDefinitionFile(String key) {

        File folder;

        try {

            folder = getDefinitionsFolder();

        } catch (IOException ex) {

            return null;

        }

        File f = new File(folder, key + ".xml");

        if (f.exists()) {

            return f;

        }

        Properties prop = new Properties();

        FileInputStream fin = null;

        try {

            fin = new FileInputStream(new File(folder, "index.properties"));

            prop.load(fin);

        } catch (IOException ex) {

            return null;

        } finally {

            IOUtils.closeQuietly(fin);

        }

        String s = prop.getProperty(key, null);

        if (s == null) {

            return null;

        }

        f = new File(folder, s);

        if (f.exists()) {

            return f;

        }

        return null;

    }

    @Override

    public DynClass get(FeatureStore store, FeatureType featureType) {

        String key = this.getKey(store, featureType);

        DynClass dynClass = this.dynClasses.get(key);

        if (dynClass != null) {

            return dynClass;

        }

        File definitionFile = getDefinitionFile(key);

        if (definitionFile == null) {

            return featureType;

        }

        DynObjectManager dynObjectManager = ToolsLocator.getDynObjectManager();

        try {

            String xml = FileUtils.readFileToString(definitionFile);

            InputStream is = IOUtils.toInputStream(xml, Charset.forName("UTF-8"));

            Map<String, DynClass> dynClasses = dynObjectManager.importDynClassDefinitions(is, this.getClass().getClassLoader());

            for (DynClass aDynClass : dynClasses.values()) {

                this.dynClasses.put(aDynClass.getName(), aDynClass);

            }

        } catch (Exception ex) {

            logger.warn("Can't parse xml definition.", ex);

            return null;

        }

        dynClass = this.dynClasses.get(key);

        if (dynClass != null) {

            return dynClass;

        }

        return featureType;

    }

    @Override

    public boolean contains(FeatureStore store, FeatureType featureType) {

        String key = this.getKey(store, featureType);

        return this.dynClasses.containsKey(key);

    }

    @Override

    public void add(FeatureStore store, FeatureType featureType, DynClass dynClass) {

        try {

            String key = this.getKey(store, featureType);

            File f = new File(getDefinitionsFolder(), key + ".xml");

            DynObjectManager dynObjectManager = ToolsLocator.getDynObjectManager();

            String xml = dynObjectManager.exportSimpleDynClassDefinitions(dynClass);

            FileUtils.write(f, xml);

            this.dynClasses.put(key, dynClass);

        } catch (IOException ex) {

            throw new RuntimeException(ex);

        }

    }

    @Override

    public void remove(FeatureStore store, FeatureType featureType) {

        String key = this.getKey(store, featureType);

        this.dynClasses.remove(key);

    }

    public void addModel(File model) {

        //  TODO:

    }

}