# ClassFileDumper.java

    /*******************************************************************************
     * Copyright (c) 2009, 2013 Mountainminds GmbH & Co. KG and Contributors
     * 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:
     *    Marc R. Hoffmann - initial API and implementation
     *
     *******************************************************************************/
    package org.jacoco.agent.rt.internal;

    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.OutputStream;

    /**
     * Internal dumper for class files.
     */
    class ClassFileDumper {

    	private final File location;

    	/**
    	 * Create a new dumper for the given location.
    	 *
    	 * @param location
    	 *            relative path to dump directory. <code>null</code> if no dumps
    	 *            should be written
    	 */
    	ClassFileDumper(final String location) {
    		if (location == null) {
    			this.location = null;
    		} else {
    			this.location = new File(location);
    		}
    	}

    	/**
    	 * Dumps the given binary content under the given name if a non-
    	 * <code>null</code> location has been specified.
    	 *
    	 * @param name
    	 *            qualified class name in VM notation
    	 * @param contents
    	 *            binary contents
    	 * @throws IOException
    	 *             in case of problems while dumping the file
    	 */
    	void dump(final String name, final byte[] contents) throws IOException {
    		if (location != null) {
    			final File outputdir;
    			final String localname;
    			final int pkgpos = name.lastIndexOf('/');
    			if (pkgpos != -1) {
    				outputdir = new File(location, name.substring(0, pkgpos));
    				localname = name.substring(pkgpos + 1);
    			} else {
    				outputdir = location;
    				localname = name;
    			}
    			outputdir.mkdirs();
    			final File file = new File(outputdir, localname + ".class");
    			final OutputStream out = new FileOutputStream(file);
    			out.write(contents);
    			out.close();
    		}
    	}

    }