/*
* @(#) JarFileReader.java 1.00 2004/09/20
*
* (c) Copyright 2004 OPENSOURCE ORGANIZATION
*
* FILENAME : JarFileReader.java
* PACKAGE : org.opensource.study.jar
* CREATE DATE : 2004/09/20
* AUTHOR : Humx (humx_hn@hotmail.com)
* MODIFIED BY :
* DESCRIPTION : a class read all entry from certain file
* you are free to use and modify it.
*/
package org.opensource.study.jar.util;
import java.io.IOException;
import java.io.File;
import java.io.InputStream;
import java.io.BufferedInputStream;
import java.io.OutputStream;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.util.Enumeration;
import java.util.Map;
import java.util.HashMap;
import java.util.Set;
import java.util.HashSet;
import java.util.Iterator;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
/**
* a simple class to read entry from jar file or directory
* default it will read the entries from the nested jar | war file,
* you can this behavior by setRecursive(false), all the entry will
* be in a set.<br>
* <b>Attention:</b> the duplicated entry name will ignored.
* @author Hu mingxin
* @version 1.0
*/
public final class FileReader {
private Set suffix = null;
/**
* default constructor without argument,
* default, the file with suffix: ".jar" and ".war" will
* be read out recursively
*/
public FileReader() {
suffix = new HashSet();
suffix.add(".jar");
suffix.add(".war");
}
/**
* specifies the suffix of the file
* @param suffix the set contains the suffix of the zip file
* which should be uncompress and analyse, it means this
* process is done recursively, the entry in the set should
* be String instance.<br>
* for example:<br>
* zipSet = {".jar", ".war"};
*/
public FileReader(Set suffix) {
this.suffix = suffix;
}
/**
* read all the entries in the file, file may be a jar | war file
* or a directory, you can set the suffix of the file which one in
* the directory or jar | war file should be read recursively
* @param file the file or directory you want to process
* @return set it contains all the entries in the directory or jar
* file, maybe include entries from the nested jar | war files.
* @throws java.io.IOException if an I/O error has occurred
* @see #FileReader(Set suffix)
*/
public Set read(File file) throws IOException {
Set entries = new HashSet();
read(file, entries, false);
return entries;
}
/**
* comparatively, this method has a parameter surface, if false,
* this method's behavior is the same to read(File file).
* on the contrary, the returned set ony contain the entries of
* the surface. if it's a directory, all files in it will be scaned
* recursively; jar | war file will only list the entry in this zip
* file, if there are jar | zip file entries, they will not be read
* recursively
* @param file the file or directory you want to process
* @return set it contains all the entries in the directory or jar
* file, if surface is true, entries nested jar | war file will
* not be contained
* @throws java.io.IOException if an I/O error has occurred
* @see #read(File file)
*/
public Set read(File file, boolean surface) throws IOException {
if (surface) {
// if file is a directory, all entries should be
// read out but only jar | war file name is traced
Set entries = new HashSet();
if (file.isDirectory()) {
read(file, entries, true);
} else {
JarFile jarFile = new JarFile(file);
read(jarFile, entries, false);
}
return entries;
}
return read(file);
}
/**
* read the entries into entrySet of certain File
* @param file the file you analyse
* @param entrySet the set of the entries
* @param ignoreJar if true when jar | war file is encountered
* only the entry name of it will be add into the set.
* otherwise, jar | war entry will be retrieved recresively
* @throws java.io.IOException if an I/O error has occurred
*/
private void read(File file, Set entrySet, boolean ignoreJar)
throws IOException {
String name = file.getName();
if (file.isDirectory()) {
File[] files = file.listFiles();
for (int i = 0; i < files.length; i++) {
read(files[i], entrySet, ignoreJar);
}
} else if (isRecursiveZip(name) && !ignoreJar) {
JarFile entry = new JarFile(file);
read(entry, entrySet, true);
} else {
entrySet.add(file.getPath());
}
}
/**
* read the entries into entrySet of certain JarFile
* @param jarFile the jarFile you care about
* @param entrySet the set of the entries
* @param recursive if true, the entries in the nested jar | war
* file will also be retrieved and added into entrySet
* @throws java.io.IOException if an I/O error has occurred
*/
private void read(JarFile jarFile, Set entrySet, boolean recursive)
throws IOException {
for (Enumeration e = jarFile.entries(); e.hasMoreElements(); ) {
JarEntry jarEntry = (JarEntry)e.nextElement();
if (jarEntry.isDirectory()) {
continue;
}
String entryName = jarEntry.getName();
if (isRecursiveZip(entryName) && recursive) {
JarFile innerJarFile = getJarFile(jarFile, jarEntry);
read(innerJarFile, entrySet, recursive);
} else {
if (!entrySet.add(entryName)) {
// a duplicated entry [" + entryName + "] has been ignored";
}
}
}
}
/**
* get teh JarFile reference from the entry[jar | war] from centain
* JarFile, in other words, the inner jar | war file are uncompressed
* and it's reference is returned
* @param jarFile the jarFile you analyse
* @param jarEntry the zip entry of the jarFile
* @return jarEntry's JarFile reference
* @throws java.io.IOException if an I/O error has occurred
*/
private JarFile getJarFile(JarFile jarFile, JarEntry jarEntry)
throws IOException {
// read jar entry into a byte array
InputStream in = new BufferedInputStream(jarFile.getInputStream(jarEntry));
// write these bytes into a file
File temporary = File.createTempFile("clazzjarfile", ".jar");
OutputStream out = new BufferedOutputStream(new FileOutputStream(temporary));
int len;
byte[] buf = new byte[1024];
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
// release resource
out.flush();
out.close();
in.close();
// analyse the temporary file
return new JarFile(temporary);
}
/**
* if a file is a jar | war file, we should care about
* @param name the file's name
* @return if the file has a suffix contained in suffix
* true is return, else false
*/
private boolean isRecursiveZip(String name) {
if (suffix == null) {
return false;
}
for (Iterator i = suffix.iterator(); i.hasNext(); ) {
if (name.endsWith(i.next().toString())) {
return true;
}
}
return false;
}
}
// TODO this FileReader will generated a lot of temporary jar file, perhaps
// we should clean up all of them; 2004-9-23 07:50:15 
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