com.opensymphony.xwork2.util.classloader.JarResourceStore Maven / Gradle / Ivy
/*
* 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.
*/
package com.opensymphony.xwork2.util.classloader;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import java.io.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
/**
* Read resources from a jar file
*/
public class JarResourceStore extends AbstractResourceStore {
private static final Logger LOG = LogManager.getLogger(JarResourceStore.class);
public JarResourceStore(File file) {
super(file);
}
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) {
LOG.debug("Unable to read file [{}] from [{}]", pResourceName, file.getName(), e);
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;
}
}