/*
* Copyright 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 org.gradle.api.internal.runtimeshaded;
import org.gradle.api.DefaultTask;
import org.gradle.api.UncheckedIOException;
import org.gradle.api.file.FileCollection;
import org.gradle.api.file.FileVisitDetails;
import org.gradle.api.file.FileVisitor;
import org.gradle.api.internal.file.collections.DirectoryFileTreeFactory;
import org.gradle.api.tasks.CacheableTask;
import org.gradle.api.tasks.Classpath;
import org.gradle.api.tasks.Input;
import org.gradle.api.tasks.OutputFile;
import org.gradle.api.tasks.TaskAction;
import org.gradle.internal.ErroringAction;
import org.gradle.internal.IoActions;
import javax.inject.Inject;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
/**
* This task will generate the list of relocated packages into a file that will in turn be used when generating the runtime shaded jars. All we need is a list of packages that need to be relocated, so
* we'll make sure to filter the list of packages before generating the file.
*
* It is assumed that the layout of the directories follow the JVM conventions. This allows us to effectively skip opening the class files to determine the real package name.
*/
@CacheableTask
public class PackageListGenerator extends DefaultTask {
public static final List<String> DEFAULT_EXCLUDES = Arrays.asList(
"org/gradle",
"java",
"javax/xml",
"javax/inject",
"groovy",
"groovyjarjarantlr",
"net/rubygrapefruit",
"org/codehaus/groovy",
"org/apache/tools/ant",
"org/apache/commons/logging",
"org/slf4j",
"org/apache/log4j",
"org/apache/xerces",
"org/w3c/dom",
"org/xml/sax");
private File outputFile;
private FileCollection classpath;
private List<String> excludes;
public PackageListGenerator() {
excludes = DEFAULT_EXCLUDES;
}
@Classpath
public FileCollection getClasspath() {
return classpath;
}
public void setClasspath(FileCollection classpath) {
this.classpath = classpath;
}
@OutputFile
public File getOutputFile() {
return outputFile;
}
public void setOutputFile(File outputFile) {
this.outputFile = outputFile;
}
@Input
public List<String> getExcludes() {
return excludes;
}
public void setExcludes(List<String> excludes) {
this.excludes = excludes;
}
@Inject
protected DirectoryFileTreeFactory getDirectoryFileTreeFactory() {
throw new UnsupportedOperationException();
}
@TaskAction
public void generate() {
IoActions.writeTextFile(getOutputFile(), new ErroringAction<BufferedWriter>() {
@Override
public void doExecute(final BufferedWriter bufferedWriter) throws Exception {
Trie packages = collectPackages();
packages.dump(false, new ErroringAction<String>() {
@Override
public void doExecute(String s) throws Exception {
bufferedWriter.write(s);
bufferedWriter.newLine();
}
});
}
});
}
private Trie collectPackages() throws IOException {
Trie.Builder builder = new Trie.Builder();
for (File file : getClasspath()) {
if (file.exists()) {
if (file.getName().endsWith(".jar")) {
processJarFile(file, builder);
} else {
processDirectory(file, builder);
}
}
}
return builder.build();
}
private void processDirectory(File file, final Trie.Builder builder) {
getDirectoryFileTreeFactory().create(file).visit(new FileVisitor() {
@Override
public void visitDir(FileVisitDetails dirDetails) {
}
@Override
public void visitFile(FileVisitDetails fileDetails) {
try {
ZipEntry zipEntry = new ZipEntry(fileDetails.getPath());
InputStream inputStream = fileDetails.open();
try {
processEntry(zipEntry, builder);
} finally {
inputStream.close();
}
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
});
}
private void processJarFile(File file, final Trie.Builder builder) throws IOException {
IoActions.withResource(openJarFile(file), new ErroringAction<ZipInputStream>() {
@Override
protected void doExecute(ZipInputStream inputStream) throws Exception {
ZipEntry zipEntry = inputStream.getNextEntry();
while (zipEntry != null) {
processEntry(zipEntry, builder);
zipEntry = inputStream.getNextEntry();
}
}
});
}
private void processEntry(ZipEntry zipEntry, Trie.Builder builder) throws IOException {
String name = zipEntry.getName();
if (name.endsWith(".class")) {
processClassFile(zipEntry, builder);
}
}
private void processClassFile(ZipEntry zipEntry, Trie.Builder builder) throws IOException {
int endIndex = zipEntry.getName().lastIndexOf("/");
if (endIndex > 0) {
String packageName = zipEntry.getName().substring(0, endIndex);
for (String exclude : getExcludes()) {
if ((packageName + "/").startsWith(exclude + "/")) {
return;
}
}
builder.addWord(packageName);
}
}
private static ZipInputStream openJarFile(File file) throws IOException {
return new ZipInputStream(new FileInputStream(file));
}
}