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Glassfish example source code file (JarResourceExtractor.java)

This example Glassfish source code file (JarResourceExtractor.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Glassfish tags/keywords

arraylist, bufferedinputstream, bufferedinputstream, byte, byte, bytearray, bytearrayinputstream, fileinputstream, hashtable, io, ioexception, ioexception, jarresourceextractor, log, logging, util, zip, zipinputstream, zipinputstream

The Glassfish JarResourceExtractor.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.enterprise.connectors.util;

import java.io.*;
import java.util.*;
import java.util.logging.Logger;
import java.util.zip.*;

import com.sun.logging.LogDomains;
import java.util.logging.Level;


/**
 * JarResourceExtractor: JarResourceExtractor maps all resources included in a Zip or Jar file.
 * Additionaly, it provides a method to extract one as a blob.
 * 
 * @author Sivakumar Thyagarajan
 */

public final class JarResourceExtractor {
    static Logger _logger = LogDomains.getLogger(JarResourceExtractor.class, LogDomains.RSR_LOGGER);

    //resourceName as String Vs contents as byte[]
    private Hashtable htJarContents = new Hashtable();
    
    /**
     * creates a JarResourceExtractor. It extracts all resources from a Jar into an
     * internal hashtable, keyed by resource names.
     * 
     * @param jarFileName
     *            a jar or zip file
     */
    public JarResourceExtractor(String jarFileName) {
        init(jarFileName);
    }
    
    /**
     * Extracts a jar resource as a blob.
     * 
     * @param name
     *            a resource name.
     */
    public byte[] getResource(String name) {
        if(_logger.isLoggable(Level.FINER)) {
            _logger.finer("getResource: " + name);
        }
        return (byte[]) htJarContents.get(name);
    }
    
    /** initializes internal hash tables with Jar file resources. */
    private void init(String jarFileName) {
        try {
            //extract resources and put them into the hashtable.
            FileInputStream fis = new FileInputStream(jarFileName);
            BufferedInputStream bis = new BufferedInputStream(fis);
            ZipInputStream zis = new ZipInputStream(bis);            
            extractResources(zis);
        } catch (Exception ex){
            ex.printStackTrace();
        }
        
    }
    
    /**
     * @throws FileNotFoundException
     * @throws IOException
     */
    private void extractResources(ZipInputStream zis) throws FileNotFoundException, IOException {
        ZipEntry ze = null;
        while ((ze = zis.getNextEntry()) != null) {
            if(_logger.isLoggable(Level.FINER)) {
                _logger.finer("ExtractResources : " + ze.getName());
            }
            extractZipEntryContents(ze, zis);
        }
    }
    
    /**
     * @param zis
     * @throws IOException
     */
    private void extractZipEntryContents(ZipEntry ze, ZipInputStream zis) throws IOException {
            if (ze.isDirectory()) {
                return;
            }

            if(_logger.isLoggable(Level.FINER)) {
                _logger.finer("ze.getName()=" + ze.getName() + ","
                        + "getSize()=" + ze.getSize());
            }

            byte[] b = getZipEntryContents(ze,zis);
            //If it is a jar go RECURSIVE !!
            if(ze.getName().trim().endsWith(".jar")){
                if(_logger.isLoggable(Level.FINER)) {
                    _logger.finer("JAR - going into it !!");
                }
                BufferedInputStream bis = new BufferedInputStream( (new ByteArrayInputStream(b)));
                extractResources(new ZipInputStream(bis));
            } else {
                //add to internal resource hashtable
                htJarContents.put(ze.getName(), b );
                if (ze.getName().trim().endsWith("class")){
                    if(_logger.isLoggable(Level.FINER)) {
                        _logger.finer("CLASS added " + ze.getName());
                    }
                }
                if(_logger.isLoggable(Level.FINER)) {
                    _logger.finer(ze.getName() + ",size="
                        + b.length + ",csize=" + ze.getCompressedSize());
                }
            }
    }
    
    private byte[] getZipEntryContents(ZipEntry ze, ZipInputStream zis) throws IOException{
        int size = (int) ze.getSize();
        
        byte[] b = null;
        // -1 means unknown size.
        if (size != -1) {
            //got a proper size, read 'size' bytes
            b = new byte[(int) size];
            
            int rb = 0;
            int chunk = 0;
            
            while (((int) size - rb) > 0) {
                chunk = zis.read(b, rb, (int) size - rb);
                if (chunk == -1) {
                    break;
                }
                rb += chunk;
            }
        } else {
            //size of entry unknown .. keep on reading till we hit a -1
            ArrayList al = new ArrayList();
            int c = 0;
            while( (c = zis.read()) != -1) {
                al.add(new Byte((byte)c));
            }
            Byte[] btArr = (Byte[])al.toArray(new Byte[]{});
            b = new byte[btArr.length];
            if(_logger.isLoggable(Level.FINER)) {
                _logger.finer("ByteArray length" + btArr.length);
            }
            for (int i = 0; i < btArr.length; i++) {
                b[i] = btArr[i].byteValue();
            }
        }
        
        return b;
    }
}

Other Glassfish examples (source code examples)

Here is a short list of links related to this Glassfish JarResourceExtractor.java source code file:

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