Mega Code Archive
Jar Entry OutputStream
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/*
* The contents of this file are subject to the Sapient Public License
* Version 1.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
* http://carbon.sf.net/License.html.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
*
* The Original Code is The Carbon Component Framework.
*
* The Initial Developer of the Original Code is Sapient Corporation
*
* Copyright (C) 2003 Sapient Corporation. All Rights Reserved.
*/
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.InvalidParameterException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.StringTokenizer;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;
import java.util.zip.ZipEntry;
import sun.rmi.runtime.Log;
/**
* An output stream that is used by EnhancedJarFile to write entries to a jar.
* This implementation uses a ByteArrayOutputStream to buffer the output
* until the stream is closed. When the stream is closed, the output is written
* to the jar.
*
* Copyright 2002 Sapient
* @since carbon 1.0
* @author Douglas Voet, April 2002
* @version $Revision: 1.9 $($Author: dvoet $ / $Date: 2003/05/05 21:21:23 $)
*/
public class JarEntryOutputStream extends ByteArrayOutputStream {
private EnhancedJarFile jar;
private String jarEntryName;
/**
* Constructor
*
* @param jar the EnhancedJarFile that this instance will write to
* @param jarEntryName the name of the entry to be written
*/
public JarEntryOutputStream(
EnhancedJarFile jar,
String jarEntryName) {
super();
this.jarEntryName = jarEntryName;
this.jar = jar;
}
/**
* Closes the stream and writes entry to the jar
*/
public void close() throws IOException {
writeToJar();
super.close();
}
/**
* Writes the entry to a the jar file. This is done by creating a
* temporary jar file, copying the contents of the existing jar to the
* temp jar, skipping the entry named by this.jarEntryName if it exists.
* Then, if the stream was written to, then contents are written as a
* new entry. Last, a callback is made to the EnhancedJarFile to
* swap the temp jar in for the old jar.
*/
private void writeToJar() throws IOException {
File jarDir = new File(this.jar.getName()).getParentFile();
// create new jar
File newJarFile = File.createTempFile("config", ".jar", jarDir);
newJarFile.deleteOnExit();
JarOutputStream jarOutputStream =
new JarOutputStream(new FileOutputStream(newJarFile));
try {
Enumeration entries = this.jar.entries();
// copy all current entries into the new jar
while (entries.hasMoreElements()) {
JarEntry nextEntry = (JarEntry) entries.nextElement();
// skip the entry named jarEntryName
if (!this.jarEntryName.equals(nextEntry.getName())) {
// the next 3 lines of code are a work around for
// bug 4682202 in the java.sun.com bug parade, see:
// http://developer.java.sun.com/developer/bugParade/bugs/4682202.html
JarEntry entryCopy = new JarEntry(nextEntry);
entryCopy.setCompressedSize(-1);
jarOutputStream.putNextEntry(entryCopy);
InputStream intputStream =
this.jar.getInputStream(nextEntry);
// write the data
for (int data = intputStream.read();
data != -1;
data = intputStream.read()) {
jarOutputStream.write(data);
}
}
}
// write the new or modified entry to the jar
if (size() > 0) {
jarOutputStream.putNextEntry(new JarEntry(this.jarEntryName));
jarOutputStream.write(super.buf, 0, size());
jarOutputStream.closeEntry();
}
} finally {
// close close everything up
try {
if (jarOutputStream != null) {
jarOutputStream.close();
}
} catch (IOException ioe) {
// eat it, just wanted to close stream
}
}
// swap the jar
this.jar.swapJars(newJarFile);
}
}
/*
* The contents of this file are subject to the Sapient Public License
* Version 1.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
* http://carbon.sf.net/License.html.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
*
* The Original Code is The Carbon Component Framework.
*
* The Initial Developer of the Original Code is Sapient Corporation
*
* Copyright (C) 2003 Sapient Corporation. All Rights Reserved.
*/
/**
* This class enhances functionality of java.util.jar.JarFile.
* Additional functionality includes jar entry removal, the ability to list
* the entries within a directory within the jar, and the ability to get
* an output stream for modifying extisting entries.
*
* @see java.util.jar.JarFile
*
* Copyright 2002 Sapient
* @since carbon 1.0
* @author Doug Voet, April 2002
* @version $Revision: 1.11 $ ($Author: dvoet $)
*/
class EnhancedJarFile {
public static final String JAR_DELIMETER = "/";
private JarFile jar;
/**
* @see java.util.jar.JarFile#JarFile(java.lang.String)
*/
public EnhancedJarFile(String name) throws IOException {
this.jar = new JarFile(name);
}
/**
* @see java.util.jar.JarFile#JarFile(java.lang.String, boolean)
*/
public EnhancedJarFile(String name, boolean verify) throws IOException {
this.jar = new JarFile(name, verify);
}
/**
* @see java.util.jar.JarFile#JarFile(java.io.File)
*/
public EnhancedJarFile(File file) throws IOException {
this.jar = new JarFile(file);
}
/**
* @see java.util.jar.JarFile#JarFile(java.io.File, boolean)
*/
public EnhancedJarFile(File file, boolean verify) throws IOException {
this.jar = new JarFile(file, verify);
}
/**
* @see java.util.jar.JarFile#JarFile(java.io.File, boolean, int)
*/
public EnhancedJarFile(File file, boolean verify, int mode)
throws IOException {
this.jar = new JarFile(file, verify, mode);
}
/**
* Returns a list of entries that are
* immediately below the entry named by entryName in the jar's directory
* structure.
*
* @param entryName the name of the directory entry name
* @return List a list of java.util.jar.JarEntry objects that are
* immediately below the entry named by entryName in the jar's directory
* structure.
*/
public List listSubEntries(String entryName) {
Enumeration entries = jar.entries();
List subEntries = new ArrayList();
while(entries.hasMoreElements()) {
JarEntry nextEntry = (JarEntry) entries.nextElement();
if (nextEntry.getName().startsWith(entryName)) {
// the next entry name starts with the entryName so it
// is a potential sub entry
// tokenize the rest of the next entry name to see how
// many tokens exist
StringTokenizer tokenizer = new StringTokenizer(
nextEntry.getName().substring(entryName.length()),
EnhancedJarFile.JAR_DELIMETER);
if (tokenizer.countTokens() == 1) {
// only 1 token exists, so it is a sub-entry
subEntries.add(nextEntry);
}
}
}
return subEntries;
}
/**
* Creates a new output entry stream within the jar. The entry named
* will be created if it does not exist within the jar already.
*
* @param entryName name of the entry for which to create an output
* stream.
* @return JarEntryOutputStream
*/
public JarEntryOutputStream getEntryOutputStream(String entryName) {
return new JarEntryOutputStream(this, entryName);
}
/**
* Removes the given entry from the jar. If the entry does not exist,
* the method returns without doing anything.
*
* @param entry entry to be removed
* @throws IOException if there is a problem writing the changes
* to the jar
*/
public void removeEntry(JarEntry entry) throws IOException {
// opens an output stream and closes it without writing anything to it
if (entry != null && getEntry(entry.getName()) != null) {
JarEntryOutputStream outputStream =
new JarEntryOutputStream(this, entry.getName());
outputStream.close();
}
}
/**
* @see java.util.jar.JarFile#entries()
*/
public Enumeration entries() {
return this.jar.entries();
}
/**
* @see java.util.jar.JarFile#getEntry(java.lang.String)
*/
public ZipEntry getEntry(String arg0) {
return this.jar.getEntry(arg0);
}
/**
* @see java.util.jar.JarFile#getInputStream(java.util.zip.ZipEntry)
*/
public InputStream getInputStream(ZipEntry arg0) throws IOException {
return this.jar.getInputStream(arg0);
}
/**
* @see java.util.jar.JarFile#getJarEntry(java.lang.String)
*/
public JarEntry getJarEntry(String arg0) {
return this.jar.getJarEntry(arg0);
}
/**
* @see java.util.jar.JarFile#getManifest()
*/
public Manifest getManifest() throws IOException {
return this.jar.getManifest();
}
/**
* @see java.util.zip.ZipFile#close()
*/
public void close() throws IOException {
this.jar.close();
}
/**
* @see java.util.zip.ZipFile#getName()
*/
public String getName() {
return this.jar.getName();
}
/**
* @see java.util.zip.ZipFile#size()
*/
public int size() {
return this.jar.size();
}
/**
* Utility method used to swap the underlying jar file out for the new one.
* This method closes the old jar file, deletes it, moves the new jar
* file to the location where the old one used to be and opens it.
*
* This is used when modifying the jar (removal, addition, or changes
* of entries)
*
* @param newJarFile the file object pointing to the new jar file
*/
void swapJars(File newJarFile) throws IOException {
File oldJarFile = new File(getName());
this.jar.close();
oldJarFile.delete();
if (newJarFile.renameTo(oldJarFile)) {
this.jar = new JarFile(oldJarFile);
} else {
throw new IOException();
}
}
}
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