/*******************************************************************************
 * Copyright (c) 2000, 2008 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.jface.text;


/**
 * Convenience class for positions that have a type, similar to
 * {@link org.eclipse.jface.text.ITypedRegion}.
 * <p>
 * As {@link org.eclipse.jface.text.Position},<code>TypedPosition</code> can
 * not be used as key in hash tables as it overrides <code>equals</code> and
 * <code>hashCode</code> as it would be a value object.
 */
public class TypedPosition extends Position {

	/** The type of the region described by this position */
	private String fType;

	/**
	 * Creates a position along the given specification.
	 *
	 * @param offset the offset of this position
	 * @param length the length of this position
	 * @param type the content type of this position
	 */
	public TypedPosition(int offset, int length, String type) {
		super(offset, length);
		fType= type;
	}

	/**
	 * Creates a position based on the typed region.
	 *
	 * @param region the typed region
	 */
	public TypedPosition(ITypedRegion region) {
		super(region.getOffset(), region.getLength());
		fType= region.getType();
	}

	/**
	 * Returns the content type of the region.
	 *
	 * @return the content type of the region
	 */
	public String getType() {
		return fType;
	}

	@Override
	public boolean equals(Object o) {
		if (o instanceof TypedPosition) {
			if (super.equals(o)) {
				TypedPosition p= (TypedPosition) o;
				return (fType == null && p.getType() == null) || fType.equals(p.getType());
			}
		}
		return false;
	}

	@Override
	public int hashCode() {
	 	int type= fType == null ? 0 : fType.hashCode();
	 	return super.hashCode() | type;
	 }

	@Override
	public String toString() {
		return fType + " - " + super.toString(); //$NON-NLS-1$
	}
}
