/*******************************************************************************
 * Copyright (c) 2009 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.wst.sse.ui.internal.search;

import org.eclipse.core.resources.IFile;

/**
 * This is used as the element for a <code>Match</code> object by
 * <code>BasicSearchQuery</code>.  It contains all the needed information
 * for use by the query, result providers, and label providers.
 *
 * @see org.eclipse.search.ui.text.Match
 * @see org.eclipse.wst.sse.ui.internal.search.BasicSearchQuery
 */
public class BasicSearchMatchElement {
	/**
	 * The file this element is a match on
	 */
	private IFile fFile;
	
	/**
	 * The line number this element is a match on
	 */
	private int fLineNumber;
	
	/**
	 * The offset of the line in the file
	 */
	private int fLineOffset;
	
	/**
	 * The line this match is on
	 */
	private String fLine;
	
	/**
	 * Constructor
	 * 
	 * @param file The file this element is a match on
	 * @param lineNumber The line number this element is a match on
	 * @param lineOffset The offset of the line in the file
	 * @param message The message associated with this element
	 */
	public BasicSearchMatchElement(IFile file, int lineNumber, int lineOffset, String message) {
		this.fFile = file;
		this.fLineNumber = lineNumber;
		this.fLineOffset = lineOffset;
		this.fLine = message;
	}
	
	/**
	 * @return The file this element is a match on
	 */
	public IFile getFile() {
		return this.fFile;
	}
	
	/**
	 * @return The line number this element is a match on
	 */
	public int getLineNum() {
		return this.fLineNumber;
	}
	
	/**
	 * @return the offset of the line the match is on in the file
	 */
	public int geLineOffset() {
		return this.fLineOffset;
	}
	
	/**
	 * @return The line this match is on
	 */
	public String getLine() {
		return this.fLine;
	}
	
	/**
	 * <p>Two <code>BasicSearchMatchElement</code> are equal if they are
	 * both on the same line. This helps with determining how many matches
	 * are all on the same line which is automatically taken care of by
	 * internal Eclipse search APIs so long as this equal method is structured
	 * thusly.</p>
	 * 
	 * @see java.lang.Object#equals(java.lang.Object)
	 */
	public boolean equals(Object obj) {
		boolean equal = false;
		
		if(obj instanceof BasicSearchMatchElement) {
			equal = getLineNum() == ((BasicSearchMatchElement)obj).getLineNum();
		}
		
		return equal;
	}
	
	/**
	 * Like the <code>#equals</code> method this function is needed so
	 * that the internal Eclipse search APIs can keep track of matches
	 * that are on the same line.
	 * 
	 * @see java.lang.Object#hashCode()
	 */
	public int hashCode() {
		return getLineNum() + getLine().hashCode();
	}
}