DirectoryOutputPool.java

/**
 * Copyright (c) 2006-2011 Floggy Open Source Group. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.sourceforge.floggy.persistence.pool;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import java.net.URL;

import javassist.CannotCompileException;
import javassist.CtClass;
import javassist.NotFoundException;

import org.apache.commons.io.IOUtils;

/**
 * DOCUMENT ME!
 *
 * @author <a href="mailto:thiago.moreira@floggy.org">Thiago Moreira</a>
 * @version $Revision$
  */
public class DirectoryOutputPool implements OutputPool {
	/**
	 * DOCUMENT ME!
	 */
	protected File directory;

	/**
	 * Creates a new DirectoryOutputPool object.
	 *
	 * @param directory DOCUMENT ME!
	 */
	public DirectoryOutputPool(File directory) {
		this.directory = directory;

		if ((this.directory != null) && !this.directory.exists()) {
			this.directory.mkdirs();
		}
	}

	/**
	 * DOCUMENT ME!
	*
	* @param ctClass DOCUMENT ME!
	*
	* @throws NotFoundException DOCUMENT ME!
	* @throws IOException DOCUMENT ME!
	* @throws CannotCompileException DOCUMENT ME!
	*/
	public void addClass(CtClass ctClass)
		throws NotFoundException, IOException, CannotCompileException {
		File classFile = this.getOutputFile(ctClass);
		classFile.getParentFile().mkdirs();

		if (classFile.exists()) {
			classFile.delete();
		}

		write(new ByteArrayInputStream(ctClass.toBytecode()), classFile);
	}

	/**
	 * DOCUMENT ME!
	*
	* @param fileURL DOCUMENT ME!
	* @param fileName DOCUMENT ME!
	*
	* @throws IOException DOCUMENT ME!
	*/
	public void addFile(URL fileURL, String fileName) throws IOException {
		addResource(fileURL.openStream(), fileName);
	}

	/**
	 * DOCUMENT ME!
	*
	* @param resourceStream DOCUMENT ME!
	* @param fileName DOCUMENT ME!
	*
	* @throws IOException DOCUMENT ME!
	*/
	public void addResource(InputStream resourceStream, String fileName)
		throws IOException {
		File temp;
		int lastIndex = fileName.lastIndexOf(File.separatorChar);

		if (lastIndex == -1) {
			temp = directory;
		} else {
			temp = new File(directory, fileName.substring(0, lastIndex));
		}

		if (!temp.exists()) {
			temp.mkdirs();
		}

		write(resourceStream, new File(temp, fileName.substring(lastIndex + 1)));
	}

	/**
	 * DOCUMENT ME!
	*/
	public void finish() {
	}

	/**
	 * DOCUMENT ME!
	*
	* @param ctClass DOCUMENT ME!
	*
	* @return DOCUMENT ME!
	*/
	protected File getOutputFile(CtClass ctClass) {
		File outputFile =
			new File(directory.getPath() + File.separatorChar
				+ ctClass.getName().replace('.', File.separatorChar) + ".class");

		return outputFile;
	}

	private void write(InputStream in, File file) throws IOException {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		IOUtils.copy(in, baos);
		baos.flush();

		ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
		FileOutputStream out = new FileOutputStream(file);
		IOUtils.copy(bais, out);
		out.flush();
		out.close();
		in.close();
	}
}