ClassFilePool.java

/*******************************************************************************
 * Copyright (c) 2005, 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.jdt.internal.compiler;

import java.util.Arrays;

import org.eclipse.jdt.internal.compiler.lookup.SourceTypeBinding;

public class ClassFilePool {
	public static final int POOL_SIZE= 25; // need to have enough for 2 units

	ClassFile[] classFiles;

	private ClassFilePool() {
		// prevent instantiation
		this.classFiles= new ClassFile[POOL_SIZE];
	}

	public static ClassFilePool newInstance() {
		return new ClassFilePool();
	}

	public synchronized ClassFile acquire(SourceTypeBinding typeBinding) {
		for (int i= 0; i < POOL_SIZE; i++) {
			ClassFile classFile= this.classFiles[i];
			if (classFile == null) {
				ClassFile newClassFile= new ClassFile(typeBinding);
				this.classFiles[i]= newClassFile;
				newClassFile.isShared= true;
				return newClassFile;
			}
			if (!classFile.isShared) {
				classFile.reset(typeBinding);
				classFile.isShared= true;
				return classFile;
			}
		}
		return new ClassFile(typeBinding);
	}

	public synchronized void release(ClassFile classFile) {
		classFile.isShared= false;
	}

	public void reset() {
		Arrays.fill(this.classFiles, null);
	}
}