/*******************************************************************************
 * 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;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.eclipse.ui.internal.util.Util;

public final class ActivityBindingDefinition implements IActivityBindingDefinition {

	private final static int HASH_FACTOR = 89;
	private final static int HASH_INITIAL = ActivityBindingDefinition.class.getName().hashCode();

	static Map activityBindingDefinitionsByCommandId(Collection activityBindingDefinitions) {
		if (activityBindingDefinitions == null)
			throw new NullPointerException();

		Map map = new HashMap();			
		Iterator iterator = activityBindingDefinitions.iterator();
		
		while (iterator.hasNext()) {
			Object object = iterator.next();
			Util.assertInstance(object, IActivityBindingDefinition.class);			
			IActivityBindingDefinition activityBindingDefinition = (IActivityBindingDefinition) object;
			String commandId = activityBindingDefinition.getCommandId();
			
			if (commandId != null) {
				Collection activityBindingDefinitions2 = (Collection) map.get(commandId);
					
				if (activityBindingDefinitions2 == null) {
					activityBindingDefinitions2 = new ArrayList();
					map.put(commandId, activityBindingDefinitions2);					
				}
	
				activityBindingDefinitions2.add(activityBindingDefinition);		
			}											
		}				
	
		return map;
	}		
	
	private String activityId;
	private String commandId;
	private String pluginId;

	private transient int hashCode;
	private transient boolean hashCodeComputed;
	private transient String string;

	public ActivityBindingDefinition(String activityId, String commandId, String pluginId) {
		this.activityId = activityId;
		this.commandId = commandId;
		this.pluginId = pluginId;
	}
	
	public int compareTo(Object object) {
		ActivityBindingDefinition castedObject = (ActivityBindingDefinition) object;
		int compareTo = Util.compare(activityId, castedObject.activityId);
		
		if (compareTo == 0) {		
			compareTo = Util.compare(commandId, castedObject.commandId);			
		
			if (compareTo == 0)
				compareTo = Util.compare(pluginId, castedObject.pluginId);								
		}
		
		return compareTo;	
	}
	
	public boolean equals(Object object) {
		if (!(object instanceof ActivityBindingDefinition))
			return false;

		ActivityBindingDefinition castedObject = (ActivityBindingDefinition) object;	
		boolean equals = true;
		equals &= Util.equals(activityId, castedObject.activityId);
		equals &= Util.equals(commandId, castedObject.commandId);
		equals &= Util.equals(pluginId, castedObject.pluginId);
		return equals;
	}

	public String getActivityId() {
		return activityId;
	}

	public String getCommandId() {
		return commandId;
	}

	public String getPluginId() {
		return pluginId;
	}

	public int hashCode() {
		if (!hashCodeComputed) {
			hashCode = HASH_INITIAL;
			hashCode = hashCode * HASH_FACTOR + Util.hashCode(activityId);
			hashCode = hashCode * HASH_FACTOR + Util.hashCode(commandId);
			hashCode = hashCode * HASH_FACTOR + Util.hashCode(pluginId);
			hashCodeComputed = true;
		}
			
		return hashCode;
	}

	public String toString() {
		if (string == null) {
			final StringBuffer stringBuffer = new StringBuffer();
			stringBuffer.append('[');
			stringBuffer.append(activityId);
			stringBuffer.append(',');
			stringBuffer.append(commandId);
			stringBuffer.append(',');
			stringBuffer.append(pluginId);
			stringBuffer.append(']');
			string = stringBuffer.toString();
		}
	
		return string;
	}	
}