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Copyright (c) 2004, 2007 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.core.runtime.internal.adaptor;
import java.io.*;

Internal class.
public class Locker_JavaIo implements Locker {
	private File lockFile;
	public Locker_JavaIo(File lockFile) {
		this. = lockFile;
	}
	public synchronized boolean lock() throws IOException {
		//if the lock file already exists, try to delete,
		//assume failure means another eclipse has it open
			return false;
		//open the lock file so other instances can't co-exist
		 = new RandomAccessFile("rw"); //$NON-NLS-1$
		try {
catch (IOException e) {
			 = null;
			throw e;
		}
		return true;
	}
	public synchronized void release() {
		try {
			if ( != null) {
				 = null;
			}
catch (IOException e) {
			//don't complain, we're making a best effort to clean up
		}
		if ( != null)
	}
	public synchronized boolean isLocked() throws IOException {
		if ( != null)
			return true;
		try {
			return !lock();
finally {
		}
	}
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