bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/commands/registry/FileCommandRegistry.java

/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.ui.internal.commands.registry;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import java.util.Collections;
import java.util.List;

import org.eclipse.ui.IMemento;
import org.eclipse.ui.WorkbenchException;
import org.eclipse.ui.XMLMemento;

public final class FileCommandRegistry extends AbstractMutableCommandRegistry {

	private final static String TAG_ROOT = Persistence.PACKAGE_FULL;

	private File file;

	public FileCommandRegistry(File file) {	
		if (file == null)
			throw new NullPointerException();
		
		this.file = file;
	}

	public void load() 
		throws IOException {
		Reader reader = new BufferedReader(new FileReader(file));
			
		try {
			IMemento memento = XMLMemento.createReadRoot(reader);
			List activeKeyConfigurationDefinitions = Collections.unmodifiableList(Persistence.readActiveKeyConfigurationDefinitions(memento, Persistence.TAG_ACTIVE_KEY_CONFIGURATION, null));
			List categoryDefinitions = Collections.unmodifiableList(Persistence.readCategoryDefinitions(memento, Persistence.TAG_CATEGORY, null));
			List commandDefinitions = Collections.unmodifiableList(Persistence.readCommandDefinitions(memento, Persistence.TAG_COMMAND, null));
			List contextBindingDefinitions = Collections.unmodifiableList(Persistence.readContextBindingDefinitions(memento, Persistence.TAG_CONTEXT_BINDING, null));
			List imageBindingDefinitions = Collections.unmodifiableList(Persistence.readImageBindingDefinitions(memento, Persistence.TAG_IMAGE_BINDING, null));
			List keyBindingDefinitions = Collections.unmodifiableList(Persistence.readKeyBindingDefinitions(memento, Persistence.TAG_KEY_BINDING, null));
			List keyConfigurationDefinitions = Collections.unmodifiableList(Persistence.readKeyConfigurationDefinitions(memento, Persistence.TAG_KEY_CONFIGURATION, null));			
			boolean commandRegistryChanged = false;
			
			if (!activeKeyConfigurationDefinitions.equals(this.activeKeyConfigurationDefinitions)) {
				this.activeKeyConfigurationDefinitions = activeKeyConfigurationDefinitions;			
				commandRegistryChanged = true;
			}	

			if (!categoryDefinitions.equals(this.categoryDefinitions)) {
				this.categoryDefinitions = categoryDefinitions;			
				commandRegistryChanged = true;
			}	
				
			if (!commandDefinitions.equals(this.commandDefinitions)) {
				this.commandDefinitions = commandDefinitions;			
				commandRegistryChanged = true;
			}	
				
			if (!contextBindingDefinitions.equals(this.contextBindingDefinitions)) {
				this.contextBindingDefinitions = contextBindingDefinitions;			
				commandRegistryChanged = true;
			}	
			
			if (!imageBindingDefinitions.equals(this.imageBindingDefinitions)) {
				this.imageBindingDefinitions = imageBindingDefinitions;			
				commandRegistryChanged = true;
			}	
				
			if (!keyBindingDefinitions.equals(this.keyBindingDefinitions)) {
				this.keyBindingDefinitions = keyBindingDefinitions;			
				commandRegistryChanged = true;
			}	
				
			if (!keyConfigurationDefinitions.equals(this.keyConfigurationDefinitions)) {
				this.keyConfigurationDefinitions = keyConfigurationDefinitions;			
				commandRegistryChanged = true;
			}	
				
			if (commandRegistryChanged)
				fireCommandRegistryChanged();
		} catch (WorkbenchException eWorkbench) {
			throw new IOException();
		} finally {
			reader.close();
		}
	}
	
	public void save()
		throws IOException {
		XMLMemento xmlMemento = XMLMemento.createWriteRoot(TAG_ROOT);		
		Persistence.writeActiveKeyConfigurationDefinitions(xmlMemento, Persistence.TAG_ACTIVE_KEY_CONFIGURATION, activeKeyConfigurationDefinitions);		
		Persistence.writeCategoryDefinitions(xmlMemento, Persistence.TAG_CATEGORY, categoryDefinitions);		
		Persistence.writeCommandDefinitions(xmlMemento, Persistence.TAG_COMMAND, commandDefinitions);
		Persistence.writeContextBindingDefinitions(xmlMemento, Persistence.TAG_CONTEXT_BINDING, contextBindingDefinitions);
		Persistence.writeImageBindingDefinitions(xmlMemento, Persistence.TAG_IMAGE_BINDING, imageBindingDefinitions);
		Persistence.writeKeyBindingDefinitions(xmlMemento, Persistence.TAG_KEY_BINDING, keyBindingDefinitions);
		Persistence.writeKeyConfigurationDefinitions(xmlMemento, Persistence.TAG_KEY_CONFIGURATION, keyConfigurationDefinitions);
		Writer writer = new BufferedWriter(new FileWriter(file));		
		
		try {
			xmlMemento.save(writer);
		} finally {
			writer.close();
		}		
	}
}