/*******************************************************************************
 * 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.contexts;

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

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

final class ContextDefinition implements Comparable {
	private final static int HASH_FACTOR = 89;
	private final static int HASH_INITIAL =
		ContextDefinition.class.getName().hashCode();

	static Map contextDefinitionsById(
		Collection contextDefinitions,
		boolean allowNullIds) {
		if (contextDefinitions == null)
			throw new NullPointerException();

		Map map = new HashMap();
		Iterator iterator = contextDefinitions.iterator();

		while (iterator.hasNext()) {
			Object object = iterator.next();
			Util.assertInstance(object, ContextDefinition.class);
			ContextDefinition contextDefinition = (ContextDefinition) object;
			String id = contextDefinition.getId();

			if (allowNullIds || id != null)
				map.put(id, contextDefinition);
		}

		return map;
	}

	static Map contextDefinitionsByName(
		Collection contextDefinitions,
		boolean allowNullNames) {
		if (contextDefinitions == null)
			throw new NullPointerException();

		Map map = new HashMap();
		Iterator iterator = contextDefinitions.iterator();

		while (iterator.hasNext()) {
			Object object = iterator.next();
			Util.assertInstance(object, ContextDefinition.class);
			ContextDefinition contextDefinition = (ContextDefinition) object;
			String name = contextDefinition.getName();

			if (allowNullNames || name != null) {
				Collection contextDefinitions2 = (Collection) map.get(name);

				if (contextDefinitions2 == null) {
					contextDefinitions2 = new HashSet();
					map.put(name, contextDefinitions2);
				}

				contextDefinitions2.add(contextDefinition);
			}
		}

		return map;
	}

	private transient int hashCode;
	private transient boolean hashCodeComputed;
	private String id;
	private String name;
	private String parentId;
	private String sourceId;
	private transient String string;

	ContextDefinition(
		String id,
		String name,
		String parentId,
		String sourceId) {
		this.id = id;
		this.name = name;
		this.parentId = parentId;
		this.sourceId = sourceId;
	}

	public int compareTo(Object object) {
		ContextDefinition castedObject = (ContextDefinition) object;
		int compareTo = Util.compare(id, castedObject.id);

		if (compareTo == 0) {
			compareTo = Util.compare(name, castedObject.name);

			if (compareTo == 0) {
				compareTo = Util.compare(parentId, castedObject.parentId);

				if (compareTo == 0)
					compareTo = Util.compare(sourceId, castedObject.sourceId);
			}
		}

		return compareTo;
	}

	public boolean equals(Object object) {
		if (!(object instanceof ContextDefinition))
			return false;

		ContextDefinition castedObject = (ContextDefinition) object;
		boolean equals = true;
		equals &= Util.equals(id, castedObject.id);
		equals &= Util.equals(name, castedObject.name);
		equals &= Util.equals(parentId, castedObject.parentId);
		equals &= Util.equals(sourceId, castedObject.sourceId);
		return equals;
	}

	public String getId() {
		return id;
	}

	public String getName() {
		return name;
	}

	public String getParentId() {
		return parentId;
	}

	public String getSourceId() {
		return sourceId;
	}

	public int hashCode() {
		if (!hashCodeComputed) {
			hashCode = HASH_INITIAL;
			hashCode = hashCode * HASH_FACTOR + Util.hashCode(id);
			hashCode = hashCode * HASH_FACTOR + Util.hashCode(name);
			hashCode = hashCode * HASH_FACTOR + Util.hashCode(parentId);
			hashCode = hashCode * HASH_FACTOR + Util.hashCode(sourceId);
			hashCodeComputed = true;
		}

		return hashCode;
	}

	public String toString() {
		if (string == null) {
			final StringBuffer stringBuffer = new StringBuffer();
			stringBuffer.append('[');
			stringBuffer.append(id);
			stringBuffer.append(',');
			stringBuffer.append(name);
			stringBuffer.append(',');
			stringBuffer.append(parentId);
			stringBuffer.append(',');
			stringBuffer.append(sourceId);
			stringBuffer.append(']');
			string = stringBuffer.toString();
		}

		return string;
	}
}