Source Code Cross Referenced for JJarFile.java in  » J2EE » JOnAS-4.8.6 » org » objectweb » jonas » common » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » JOnAS 4.8.6 » org.objectweb.jonas.common 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * JOnAS: Java(TM) Open Application Server
003:         * Copyright (C) 1999 Bull S.A.
004:         * Contact: jonas-team@objectweb.org
005:         * 
006:         * This library is free software; you can redistribute it and/or
007:         * modify it under the terms of the GNU Lesser General Public
008:         * License as published by the Free Software Foundation; either
009:         * version 2.1 of the License, or any later version.
010:         * 
011:         * This library is distributed in the hope that it will be useful,
012:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:         * Lesser General Public License for more details.
015:         * 
016:         * You should have received a copy of the GNU Lesser General Public
017:         * License along with this library; if not, write to the Free Software
018:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
019:         * USA
020:         *
021:         * Initial developer(s): Eric HARDESTY
022:         * --------------------------------------------------------------------------
023:         * $Id: JJarFile.java,v 1.0
024:         * --------------------------------------------------------------------------
025:         */
026:
027:        package org.objectweb.jonas.common;
028:
029:        import java.io.File;
030:        import java.io.FileOutputStream;
031:        import java.io.InputStream;
032:        import java.io.IOException;
033:        import java.util.jar.JarFile;
034:        import java.util.jar.JarEntry;
035:
036:        /**
037:         * This class implements a JarFile that adds a extract/write method
038:         * @author Eric Hardesty
039:         */
040:        public class JJarFile extends JarFile {
041:
042:            /**
043:             * Size of the buffer.
044:             */
045:            private static final int BUFFER_SIZE = 2048;
046:
047:            /**
048:             * Constructs a new JarFile with the specified File.
049:             * @param file the jar file to be opened
050:             */
051:            public JJarFile(File file) throws IOException {
052:                super (file);
053:            }
054:
055:            /**
056:             * Constructs a new JarFile with the specified File.
057:             * @param file the jar file to be opened
058:             * @param verity boolean to verify if the JarFile is signed
059:             */
060:            public JJarFile(File file, boolean verify) throws IOException {
061:                super (file, verify);
062:            }
063:
064:            /**
065:             * Constructs a new JarFile with the specified File.
066:             * @param file the jar file to be opened
067:             * @param verity boolean to verify if the JarFile is signed
068:             * @param mode int of the mode to open the jar
069:             */
070:            public JJarFile(File file, boolean verify, int mode)
071:                    throws IOException {
072:                super (file, verify, mode);
073:            }
074:
075:            /**
076:             * Constructs a new JarFile with the specified File.
077:             * @param name the name of the jar file to be opened
078:             */
079:            public JJarFile(String name) throws IOException {
080:                super (name);
081:            }
082:
083:            /**
084:             * Constructs a new JarFile with the specified File.
085:             * @param name the name of the jar file to be opened
086:             * @param verity boolean to verify if the JarFile is signed
087:             */
088:            public JJarFile(String name, boolean verify) throws IOException {
089:                super (name, verify);
090:            }
091:
092:            /**
093:             * Extract the specified Jar Entry to the path given
094:             * @param jEnt the JarEntry to extract
095:             * @param filename the filename to write the extracted file
096:             */
097:            public void extract(JarEntry jEnt, String filename)
098:                    throws IOException {
099:
100:                try {
101:                    //File output
102:                    FileOutputStream out = new FileOutputStream(filename);
103:                    InputStream jis = this .getInputStream(jEnt);
104:                    int n = 0;
105:                    try {
106:                        //buffer
107:                        byte buffer[] = new byte[BUFFER_SIZE];
108:
109:                        while ((n = jis.read(buffer)) > 0) {
110:                            out.write(buffer, 0, n);
111:                        }
112:                    } finally {
113:                        out.close();
114:                        jis.close();
115:                    }
116:                } catch (IOException e) {
117:                    throw new IOException("Error while uncompressing the file "
118:                            + filename + ": " + e.getMessage());
119:                }
120:
121:            }
122:
123:        }
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