/*******************************************************************************
 * Copyright (c) 2000, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.corext.util;

import org.w3c.dom.Element;

public class QualifiedTypeNameHistory extends History {
	
	private static final String NODE_ROOT= "qualifiedTypeNameHistroy"; //$NON-NLS-1$
	private static final String NODE_TYPE_INFO= "fullyQualifiedTypeName"; //$NON-NLS-1$
	private static final String NODE_NAME= "name"; //$NON-NLS-1$
	
	private static QualifiedTypeNameHistory fgInstance;
	
	
	public static QualifiedTypeNameHistory getDefault() {
		if (fgInstance == null)
			fgInstance= new QualifiedTypeNameHistory("QualifiedTypeNameHistory.xml"); //$NON-NLS-1$
		
		return fgInstance;
	}
	
	public QualifiedTypeNameHistory(String fileName) {
		super(fileName, NODE_ROOT, NODE_TYPE_INFO);
		load();
	}

	/**
	 * {@inheritDoc}
	 */
	protected void setAttributes(Object object, Element element) {
		element.setAttribute(NODE_NAME, (String)object);
	}

	/**
	 * {@inheritDoc}
	 */
	protected Object createFromElement(Element element) {
		return element.getAttribute(NODE_NAME);
	}

	/**
	 * {@inheritDoc}
	 */
	protected Object getKey(Object object) {
		return object;
	}
	
	public static int getBoost(String fullyQualifiedTypeName, int min, int max) {
		float position= getDefault().getNormalizedPosition(fullyQualifiedTypeName);
		int dist= max - min;
		return Math.round(position * dist) + min;
	}

	public static void remember(String fullyQualifiedTypeName) {
		getDefault().accessed(fullyQualifiedTypeName);
	}

}
