package org.apache.lucene.analysis.kr.utils;
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.*;
import java.util.*;
import java.util.zip.*;
/**
* JarResources: JarResources maps all resources included in a
* Zip or Jar file. Additionaly, it provides a method to extract one
* as a blob.
*/
public final class JarResources {
// external debug flag
public boolean debugOn=false;
// jar resource mapping tables
private Hashtable htSizes=new Hashtable();
// a jar file
private String jarFileName;
/**
* creates a JarResources. It extracts all resources from a Jar
* into an internal hashtable, keyed by resource names.
* @param jarFileName a jar or zip file
*/
public JarResources(String jarFileName) {
this.jarFileName=jarFileName;
}
/**
* Extracts a jar resource as a blob.
* @param name a resource name.
*/
public byte[] getResource(String name) {
return read(name);
}
/**
* initializes internal hash tables with Jar file resources.
*/
private byte[] read(String name) {
try {
// extracts just sizes only.
ZipFile zf=new ZipFile(jarFileName);
Enumeration e=zf.entries();
while (e.hasMoreElements()) {
ZipEntry ze=(ZipEntry)e.nextElement();
if (debugOn) {
System.out.println(dumpZipEntry(ze));
}
htSizes.put(ze.getName(),new Integer((int)ze.getSize()));
}
zf.close();
// extract resources and put them into the hashtable.
FileInputStream fis=new FileInputStream(jarFileName);
BufferedInputStream bis=new BufferedInputStream(fis);
ZipInputStream zis=new ZipInputStream(bis);
ZipEntry ze=null;
while ((ze=zis.getNextEntry())!=null) {
if (ze.isDirectory()) {
continue;
}
if (debugOn) {
System.out.println(
"ze.getName()="+ze.getName()+","+"getSize()="+ze.getSize()
);
}
int size=(int)ze.getSize();
// -1 means unknown size.
if (size==-1) {
size=((Integer)htSizes.get(ze.getName())).intValue();
}
byte[] 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;
}
if (debugOn) {
System.out.println(
ze.getName()+" rb="+rb+
",size="+size+
",csize="+ze.getCompressedSize()
);
}
if(ze.getName().equals(name)) {
return b;
}
}
} catch (NullPointerException e) {
System.out.println("done.");
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* Dumps a zip entry into a string.
* @param ze a ZipEntry
*/
private String dumpZipEntry(ZipEntry ze) {
StringBuffer sb=new StringBuffer();
if (ze.isDirectory()) {
sb.append("d ");
} else {
sb.append("f ");
}
if (ze.getMethod()==ZipEntry.STORED) {
sb.append("stored ");
} else {
sb.append("defalted ");
}
sb.append(ze.getName());
sb.append("\t");
sb.append(""+ze.getSize());
if (ze.getMethod()==ZipEntry.DEFLATED) {
sb.append("/"+ze.getCompressedSize());
}
return (sb.toString());
}
}