WebServerResourcesFromJarExtractorMojo.java

/* ====================================================================
 *
 * The ObjectStyle Group Software License, Version 1.0
 *
 * Copyright (c) 2006 The ObjectStyle Group,
 * and individual authors of the software.  All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
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 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        ObjectStyle Group (http://objectstyle.org/)."
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 *    if and wherever such third-party acknowlegements normally appear.
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package org.objectstyle.woproject.maven2.wobootstrap;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarInputStream;

import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;

/**
 * extractWebServerResources goal for WebObjects jars. Copy all
 * webserverresources fram a jar into a destination folder.
 * 
 * @goal extractWebServerResources
 * @author uli
 * @since 2.0
 */
public class WebServerResourcesFromJarExtractorMojo extends AbstractMojo {

	/**
	 * @parameter
	 * @required
	 * @readonly
	 */
	private String jarFileName;

	/**
	 * @parameter
	 * @required
	 * @readonly
	 */
	private String destinationFolderName;

	public WebServerResourcesFromJarExtractorMojo() {
		super();
	}

	public void execute() throws MojoExecutionException, MojoFailureException {
		getLog().debug("Extracting webserverresources");
		if (jarFileName == null) {
			throw new MojoExecutionException("jarFileName is null");
		}
		if (destinationFolderName == null) {
			throw new MojoExecutionException("destinationFolderName is null");
		}
		FileInputStream fileInputStream;
		try {
			getLog().debug("Extract webserverresources: looking into jar named " + jarFileName);
			fileInputStream = new FileInputStream(jarFileName);
			JarInputStream jarInputStream = new JarInputStream(fileInputStream);
			int counter = 0;
			JarEntry jarEntry = null;
			while ((jarEntry = jarInputStream.getNextJarEntry()) != null) {
				if (!jarEntry.isDirectory()) {
					String jarEntryName = jarEntry.getName();
					String prefix = "WebServerResources";
					if (jarEntryName != null && jarEntryName.length() > prefix.length() && jarEntryName.startsWith(prefix)) {
						this.copyJarEntryToFile(jarEntry);
						counter++;
					}
				}
			}
			getLog().debug("Extract webserverresources: extracted " + counter + " webserverresources from  jar named " + jarFileName);
		} catch (FileNotFoundException e) {
			throw new MojoExecutionException("Could not open file input stream", e);
		} catch (IOException e) {
			throw new MojoExecutionException("Could not open jar input stream", e);
		}
	}

	private void copyJarEntryToFile(JarEntry jarEntry) throws IOException, FileNotFoundException {
		File destinationFolder = new File(destinationFolderName);
		// getLog().info("Copy webserverresources: jarFileName " + jarFileName +
		// " destinationFolder " + destinationFolder);
		String name = jarEntry.getName();
		String destinationFolderWithPathFromJarEntry = destinationFolder + File.separator + name.substring(0, name.lastIndexOf('/'));
		String destinationName = name.substring(name.lastIndexOf('/') + 1);
		// getLog().info("Copy webserverresources:
		// destinationFolderWithPathFromJarEntry " +
		// destinationFolderWithPathFromJarEntry + " destinationName " +
		// destinationName);
		File file = new File(destinationFolderWithPathFromJarEntry, destinationName);
		if (!file.getParentFile().exists()) {
			file.getParentFile().mkdirs();
		}
		// getLog().info("Copy webserverresources: file " + file);
		file.createNewFile();

		InputStream inputStream = null;
		OutputStream outputStream = null;
		try {
			inputStream = new JarFile(jarFileName).getInputStream(jarEntry);
			outputStream = new FileOutputStream(file);

			byte[] buf = new byte[1024];
			int len;
			while ((len = inputStream.read(buf)) > 0) {
				outputStream.write(buf, 0, len);
			}

		} finally {
			if (inputStream != null) {
				inputStream.close();
			}

			if (outputStream != null) {
				outputStream.close();
			}
		}
	}
}