mypreferencemanager.java

jxta官方例程

/*
 * MyPreferenceManager.java
 *
 * Created on December 31, 2005, 1:16 PM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package net.jxta.myjxta.util.preferences;

import java.awt.Dimension;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import net.jxta.ext.config.Resource;
import net.jxta.ext.config.ResourceNotFoundException;
import net.jxta.myjxta.MyJXTA;
import net.jxta.myjxta.util.Env;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;

/**
 *
 * @author polo
 */
public class MyPreferenceManager {
    
    private Resource res = null;
    private static final Logger LOG = Logger.getLogger(MyPreferenceManager.class);
    public static final String ROOT = "myjxtaPrefs";
    public static final String PREFERENCES = "preferences";
    public static final String CATEGORY = "category";
    public static final String PREFERENCE_SET = "preferenceSet";
    public static final String PREFERENCE = "preference";
    public static final String SEP = "/";
    public static final String ATTRIBUTE_NAME = "@name";
    public static final String ATTRIBUTE_DESCRIPTION = "@description";
    public static final String ATTRIBUTE_VISIBLE = "@visible";
    public static final String ATTRIBUTE_LABEL = "@label";
    public static final String ATTRIBUTE_VALUE = "@value";
    public static final String ATTRIBUTE_ENABLE = "@enable";
    public static final String ATTRIBUTE_ICON = "@icon";
    public static final String ATTRIBUTE_TOOLTIP = "@tooltip";
    public static final String ATTRIBUTE_CLASS = "@class";
    public static final String ATTRIBUTE_DIMENSION = "@dimension";
    
    public static final String  DEFAULT_PREFSET_CLASS_NAME = DefaultPreferenceSet.class.getName();
    
    public static final String CATEGORY_GENERAL = "General";
    public static final String CATEGORY_PLUGINS = "plugins";
    
public  static String PREFSET_LEGACY = null; 
    
// todo set the defalt icon
    
    public static final String DEFAULT_ICON = "TreeTable.PeerPresent";
    
    public static final String PREFERENCESET_LEGACY = "General.Legacy";
    public static final String PREFERENCESET_PLUGINPATHS = "plugins.paths";
    public static final String PREFERENCE_CHIME = "General.Legacy.Chime";
    public static final String PREFERENCE_INSTALL = "plugins.paths.install";
    
    private List<String> categoryList = null;
    private LinkedHashMap<String, PreferenceSet> prefSetTable = null;
    
    
    
    static private MyPreferenceManager myinstance = null;
    
    static public MyPreferenceManager getInstance() {
        
        if(myinstance == null) {
            
            myinstance = new MyPreferenceManager();
        }
        return myinstance;
    }
    
    public MyJXTA getMyJxta() {
        return MyJXTA.getTheInstance();
    }
    
    
    
    public static String buildPath() {
        return buildPath(null, null, null, null);
    }
    
    public static String buildPath(String categoryName) {
        return buildPath(categoryName, null, null, null);
    }
    
    public static String buildPath(String categoryName, String preferenceSetName) {
        return buildPath(categoryName,preferenceSetName, null, null);
    }
    
    public static String buildPath(String categoryName, String preferenceSetName, String preferenceName) {
        return buildPath(categoryName,preferenceSetName, preferenceName, null);
    }
    
    public static String buildPath(String categoryName, String preferenceSetName, String preferenceName, String attr) {
        StringBuffer rtn = new StringBuffer(ROOT);
        rtn.append(SEP);
        rtn.append(PREFERENCES);
        if(categoryName != null) {
            rtn.append(SEP);
            rtn.append(CATEGORY);
            rtn.append("[");
            rtn.append(ATTRIBUTE_NAME);
            rtn.append("=\"");
            rtn.append(categoryName);
            rtn.append("\"]");
            if(preferenceSetName != null) {
                rtn.append(SEP);
                rtn.append(PREFERENCE_SET);
                rtn.append("[");
                rtn.append(ATTRIBUTE_NAME);
                rtn.append("=\"");
                rtn.append(preferenceSetName);
                rtn.append("\"]");
                if( preferenceName != null) {
                    rtn.append(SEP);
                    rtn.append(PREFERENCE);
                    rtn.append("[");
                    rtn.append(ATTRIBUTE_NAME);
                    rtn.append("=\"");
                    rtn.append(preferenceName);
                    rtn.append("\"]");
                    
                    if(attr!=null) {
                        rtn.append(SEP);
                        rtn.append(attr);
                    }
                }
            }
        }
        return rtn.toString();
        
    }
    
    private Class loadClass(String className) {
        Class prefSetClass = null;
        try {
            
            prefSetClass = Class.forName(className);
            
        }catch(LinkageError le) {
            le.printStackTrace();
            prefSetClass = null;
            // xxx: todo: set status message here
        }catch(ClassNotFoundException cnfx) {
            //cnfx.printStackTrace();
            prefSetClass = null;
            // xxx: todo: set status message here
        }
        
        return prefSetClass;
        
    }
    
    public PreferenceSet instantiatePreferenceSet(String prefSetClassName) {
        
        Class prefSetClass = null;
        PreferenceSet prefSetInstance = null;
        StringBuffer errorMessage = new StringBuffer();
        /** Load class and test for correct superclass */
        prefSetClass = loadClass(prefSetClassName);
        
        if(prefSetClass == null) {
            prefSetClass = loadClass(DEFAULT_PREFSET_CLASS_NAME);
        }
        
        if(prefSetClass != null) {
            
            if (LOG.isEnabledFor(Level.DEBUG)) {
                LOG.debug("class.forName " + prefSetClass.getName());
            }
            
            Class superClass = prefSetClass.getSuperclass();
            
            if (LOG.isEnabledFor(Level.DEBUG)) {
                LOG.debug("superClass " + superClass.getName());
            }
            
            // if superclass is good then instantiate PreferenceSet class
            if(superClass.getName().equals(PreferenceSet.class.getName())) {
                
                if (LOG.isEnabledFor(Level.DEBUG)) {
                    LOG.debug("superClass is good" );
                }
                
                
                try {
                    
                    
                    Class customPreferenceSet = Class.forName(prefSetClass.getName());

                    if(PreferenceSet.class.isAssignableFrom(customPreferenceSet)) {
                        
                        prefSetInstance = (PreferenceSet) customPreferenceSet.newInstance();
                        
                        
                    }
                    
                }catch(ClassCastException ccx) {
                    ccx.printStackTrace();
                    errorMessage.append("ClassCast Error in Preference Set Class Instantiation\n\r");
                    errorMessage.append("Using Default Preference Set Class");
                    prefSetInstance = instantiatePreferenceSet(DEFAULT_PREFSET_CLASS_NAME);
                    if(prefSetInstance != null && (prefSetInstance instanceof DefaultPreferenceSet)) {
                        ((DefaultPreferenceSet)prefSetInstance).setErrorMessage(errorMessage.toString());
                    }
                    // xxx: todo: set status message here
                }catch(InstantiationException ix) {
                    ix.printStackTrace();
                    errorMessage.append("Instantiation Error in Preference Set Class Instantiation\n\r");
                    errorMessage.append("Using Default Preference Set Class");
                    prefSetInstance = instantiatePreferenceSet(DEFAULT_PREFSET_CLASS_NAME);
                    if(prefSetInstance != null && prefSetInstance instanceof DefaultPreferenceSet) {
                        ((DefaultPreferenceSet)prefSetInstance).setErrorMessage(errorMessage.toString());
                    }
                    // xxx: todo: set status message here
                }catch(IllegalAccessException iax) {
                    iax.printStackTrace();
                    errorMessage.append("IllegalAccess Error in Preference Set Class Instantiation\n\r");
                    errorMessage.append("Using Default Preference Set Class");
                    prefSetInstance = instantiatePreferenceSet(DEFAULT_PREFSET_CLASS_NAME);
                    if(prefSetInstance != null && prefSetInstance instanceof DefaultPreferenceSet) {
                        ((DefaultPreferenceSet)prefSetInstance).setErrorMessage(errorMessage.toString());
                    }
                    // xxx: todo: set status message here
                }catch(LinkageError le) {
                    le.printStackTrace();
                    errorMessage.append("Linkage Error in Preference Set Class Instantiation\n\r");
                    errorMessage.append("Using Default Preference Set Class");
                    prefSetInstance = instantiatePreferenceSet(DEFAULT_PREFSET_CLASS_NAME);
                    if(prefSetInstance != null && prefSetInstance instanceof DefaultPreferenceSet) {
                        ((DefaultPreferenceSet)prefSetInstance).setErrorMessage(errorMessage.toString());
                    }
                    // xxx: todo: set status message here
                }catch(ClassNotFoundException cnfx) {
                    cnfx.printStackTrace();
                    errorMessage.append("ClassNotFound Error in Preference Set Class Instantiation\n\r");
                    errorMessage.append("Using Default Preference Set Class");
                    prefSetInstance = instantiatePreferenceSet(DEFAULT_PREFSET_CLASS_NAME);
                    if(prefSetInstance != null && prefSetInstance instanceof DefaultPreferenceSet) {
                        ((DefaultPreferenceSet)prefSetInstance).setErrorMessage(errorMessage.toString());
                    }
                    // xxx: todo: set status message here