/*
* Copyright 2002-2006,2009 The Apache Software Foundation.
*
* Licensed 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.
*/
package com.opensymphony.xwork2.util.classloader;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
import java.io.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
/**
* Read resources from a jar file
*/
public class JarResourceStore implements ResourceStore {
private static final Logger LOG = LoggerFactory.getLogger(JarResourceStore.class);
private final File file;
public JarResourceStore(File file) {
this.file = file;
}
public void write(String pResourceName, byte[] pResourceData) {
}
public byte[] read(String pResourceName) {
InputStream in = null;
try {
ZipFile jarFile = new ZipFile(file);
ZipEntry entry = jarFile.getEntry(pResourceName);
//read into byte array
ByteArrayOutputStream out = new ByteArrayOutputStream();
in = jarFile.getInputStream(entry);
copy(in, out);
return out.toByteArray();
} catch (Exception e) {
if (LOG.isDebugEnabled())
LOG.debug("Unable to read file [#0] from [#1]", e, pResourceName, file.getName());
return null;
} finally {
closeQuietly(in);
}
}
public static long copy(InputStream input, OutputStream output)
throws IOException {
byte[] buffer = new byte[1024 * 4];
long count = 0;
int n = 0;
while (-1 != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
private void closeQuietly(InputStream is) {
try {
if (is != null)
is.close();
} catch (IOException e) {
if (LOG.isErrorEnabled())
LOG.error("Unable to close input stream", e);
}
}
}