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Micro Distribution of the Payara Project for IBM JDK
/*
* Copyright 2012-2016 the original author or authors.
*
* 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 fish.payara.micro.boot.loader.archive;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.UUID;
import java.util.jar.JarEntry;
import java.util.jar.Manifest;
import fish.payara.micro.boot.loader.data.RandomAccessData.ResourceAccess;
import fish.payara.micro.boot.loader.jar.JarFile;
/**
* {@link Archive} implementation backed by a {@link JarFile}.
*
* @author Phillip Webb
* @author Andy Wilkinson
*/
public class JarFileArchive implements Archive {
private static final String UNPACK_MARKER = "UNPACK:";
private static final int BUFFER_SIZE = 32 * 1024;
private final JarFile jarFile;
private URL url;
private File tempUnpackFolder;
public JarFileArchive(File file) throws IOException {
this(file, null);
}
public JarFileArchive(File file, URL url) throws IOException {
this(new JarFile(file));
this.url = url;
}
public JarFileArchive(JarFile jarFile) {
this.jarFile = jarFile;
}
@Override
public URL getUrl() throws MalformedURLException {
if (this.url != null) {
return this.url;
}
return this.jarFile.getUrl();
}
@Override
public Manifest getManifest() throws IOException {
return this.jarFile.getManifest();
}
@Override
public List getNestedArchives(EntryFilter filter) throws IOException {
List nestedArchives = new ArrayList();
for (Entry entry : this) {
if (filter.matches(entry)) {
nestedArchives.add(getNestedArchive(entry));
}
}
return Collections.unmodifiableList(nestedArchives);
}
@Override
public Iterator iterator() {
return new EntryIterator(this.jarFile.entries());
}
protected Archive getNestedArchive(Entry entry) throws IOException {
JarEntry jarEntry = ((JarFileEntry) entry).getJarEntry();
if (jarEntry.getComment().startsWith(UNPACK_MARKER)) {
return getUnpackedNestedArchive(jarEntry);
}
JarFile jarFile = this.jarFile.getNestedJarFile(jarEntry);
return new JarFileArchive(jarFile);
}
private Archive getUnpackedNestedArchive(JarEntry jarEntry) throws IOException {
String name = jarEntry.getName();
if (name.lastIndexOf("/") != -1) {
name = name.substring(name.lastIndexOf("/") + 1);
}
File file = new File(getTempUnpackFolder(), name);
if (!file.exists() || file.length() != jarEntry.getSize()) {
unpack(jarEntry, file);
}
return new JarFileArchive(file, file.toURI().toURL());
}
private File getTempUnpackFolder() {
if (this.tempUnpackFolder == null) {
File tempFolder = new File(System.getProperty("java.io.tmpdir"));
this.tempUnpackFolder = createUnpackFolder(tempFolder);
}
return this.tempUnpackFolder;
}
private File createUnpackFolder(File parent) {
int attempts = 0;
while (attempts++ < 1000) {
String fileName = new File(this.jarFile.getName()).getName();
File unpackFolder = new File(parent,
fileName + "-spring-boot-libs-" + UUID.randomUUID());
if (unpackFolder.mkdirs()) {
return unpackFolder;
}
}
throw new IllegalStateException(
"Failed to create unpack folder in directory '" + parent + "'");
}
private void unpack(JarEntry entry, File file) throws IOException {
try (InputStream inputStream = this.jarFile.getInputStream(entry, ResourceAccess.ONCE); OutputStream outputStream = new FileOutputStream(file)) {
byte[] buffer = new byte[BUFFER_SIZE];
int bytesRead = -1;
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
outputStream.flush();
}
}
@Override
public String toString() {
try {
return getUrl().toString();
}
catch (Exception ex) {
return "jar archive";
}
}
/**
* {@link Archive.Entry} iterator implementation backed by {@link JarEntry}.
*/
private static class EntryIterator implements Iterator {
private final Enumeration enumeration;
EntryIterator(Enumeration enumeration) {
this.enumeration = enumeration;
}
@Override
public boolean hasNext() {
return this.enumeration.hasMoreElements();
}
@Override
public Entry next() {
return new JarFileEntry(this.enumeration.nextElement());
}
@Override
public void remove() {
throw new UnsupportedOperationException("remove");
}
}
/**
* {@link Archive.Entry} implementation backed by a {@link JarEntry}.
*/
private static class JarFileEntry implements Entry {
private final JarEntry jarEntry;
JarFileEntry(JarEntry jarEntry) {
this.jarEntry = jarEntry;
}
public JarEntry getJarEntry() {
return this.jarEntry;
}
@Override
public boolean isDirectory() {
return this.jarEntry.isDirectory();
}
@Override
public String getName() {
return this.jarEntry.getName().toString();
}
}
}
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