/*
* Copyright 2016 NAVER Corp.
*
* 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.navercorp.pinpoint.profiler.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
/**
* @author Woonduk Kang(emeroad)
*/
public class JarReader {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
private static final int BUFFER_SIZE = 1024 * 4;
private final JarFile jarFile;
public JarReader(JarFile jarFile) {
if (jarFile == null) {
throw new NullPointerException("jarFile must not be null");
}
this.jarFile = jarFile;
}
public InputStream getInputStream(String name) throws IOException {
final JarEntry jarEntry = this.jarFile.getJarEntry(name);
if (jarEntry != null) {
return this.jarFile.getInputStream(jarEntry);
}
return null;
}
public List<FileBinary> read(JarEntryFilter jarEntryFilter) throws IOException{
if (jarEntryFilter == null) {
throw new NullPointerException("jarEntryFilter must not be null");
}
final BufferedContext bufferedContext = new BufferedContext();
String jarFileName = jarFile.getName();
Enumeration<JarEntry> entries = jarFile.entries();
List<FileBinary> fileBinaryList = new ArrayList<FileBinary>();
while (entries.hasMoreElements()) {
final JarEntry jarEntry = entries.nextElement();
if (jarEntryFilter.filter(jarEntry)) {
if (logger.isDebugEnabled()) {
logger.debug("filter fileName:{}, JarFile:{}", jarEntry.getName(), jarFileName);
}
FileBinary fileBinary = newFileBinary(bufferedContext, jarEntry);
fileBinaryList.add(fileBinary);
}
}
return fileBinaryList;
}
private FileBinary newFileBinary(BufferedContext bufferedContext, JarEntry jarEntry) throws IOException {
byte[] binary = bufferedContext.read(jarEntry);
FileBinary fileBinary = new FileBinary(jarEntry.getName(), binary);
return fileBinary;
}
private class BufferedContext {
private final byte[] buffer = new byte[BUFFER_SIZE];
private final ByteArrayOutputStream output = new ByteArrayOutputStream(BUFFER_SIZE);
private BufferedContext() {
}
private byte[] read(JarEntry jarEntry) throws IOException{
InputStream inputStream = null;
try {
inputStream = jarFile.getInputStream(jarEntry);
if (inputStream == null) {
logger.warn("jarEntry not found. jarFile:{} jarEntry{}", jarFile, jarEntry);
return null;
}
return read(inputStream);
} catch (IOException ioe) {
logger.warn("jarFile read error jarFile:{} jarEntry{} {}", jarFile, jarEntry, ioe.getMessage(), ioe);
throw ioe;
} finally {
close(inputStream);
}
}
public byte[] read(InputStream input) throws IOException {
this.output.reset();
read(input, output);
return output.toByteArray();
}
public void read(InputStream input, OutputStream output) throws IOException {
int readIndex;
while ((readIndex = input.read(buffer)) != -1) {
output.write(buffer, 0, readIndex);
}
}
private void close(Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (IOException ignore) {
}
}
}
}
}