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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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.
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.util.Comparator.comparing;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UncheckedIOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Arrays;
import java.util.EnumSet;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.Map;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;
import java.util.zip.CRC32;
import java.util.zip.ZipEntry;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileManager.Location;
import javax.tools.JavaFileObject;
import javax.tools.JavaFileObject.Kind;
import javax.tools.StandardJavaFileManager;
import javax.tools.StandardLocation;
import javax.tools.ToolProvider;
/**
* Output a jar file containing all classes on the JDK 8 platform classpath of the default java
* compiler of the current JDK.
*
* <p>usage: DumpPlatformClassPath <target release> output.jar
*/
public class DumpPlatformClassPath {
public static void main(String[] args) throws IOException {
if (args.length != 2) {
System.err.println("usage: DumpPlatformClassPath <target release> <output jar>");
System.exit(1);
}
String targetRelease = args[0];
Map<String, byte[]> entries = new HashMap<>();
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, UTF_8);
if (isJdk9OrLater()) {
// this configures the filemanager to use a JDK 8 bootclasspath
compiler.getTask(
null, fileManager, null, Arrays.asList("--release", targetRelease), null, null);
for (Path path : getLocationAsPaths(fileManager)) {
Files.walkFileTree(
path,
new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
throws IOException {
if (file.getFileName().toString().endsWith(".sig")) {
String outputPath = path.relativize(file).toString();
outputPath =
outputPath.substring(0, outputPath.length() - ".sig".length()) + ".class";
entries.put(outputPath, Files.readAllBytes(file));
}
return FileVisitResult.CONTINUE;
}
});
}
} else {
for (JavaFileObject fileObject :
fileManager.list(
StandardLocation.PLATFORM_CLASS_PATH,
"",
EnumSet.of(Kind.CLASS),
/* recurse= */ true)) {
String binaryName =
fileManager.inferBinaryName(StandardLocation.PLATFORM_CLASS_PATH, fileObject);
entries.put(
binaryName.replace('.', '/') + ".class", toByteArray(fileObject.openInputStream()));
}
}
try (OutputStream os = Files.newOutputStream(Paths.get(args[1]));
BufferedOutputStream bos = new BufferedOutputStream(os, 65536);
JarOutputStream jos = new JarOutputStream(bos)) {
entries
.entrySet()
.stream()
.sorted(comparing(Map.Entry::getKey))
.forEachOrdered(e -> addEntry(jos, e.getKey(), e.getValue()));
}
}
@SuppressWarnings("unchecked")
private static Iterable<Path> getLocationAsPaths(StandardJavaFileManager fileManager) {
try {
return (Iterable<Path>)
StandardJavaFileManager.class
.getMethod("getLocationAsPaths", Location.class)
.invoke(fileManager, StandardLocation.PLATFORM_CLASS_PATH);
} catch (ReflectiveOperationException e) {
throw new LinkageError(e.getMessage(), e);
}
}
// Use a fixed timestamp for deterministic jar output.
private static final long FIXED_TIMESTAMP =
new GregorianCalendar(2010, 0, 1, 0, 0, 0).getTimeInMillis();
private static void addEntry(JarOutputStream jos, String name, byte[] bytes) {
try {
JarEntry je = new JarEntry(name);
je.setTime(FIXED_TIMESTAMP);
je.setMethod(ZipEntry.STORED);
je.setSize(bytes.length);
CRC32 crc = new CRC32();
crc.update(bytes);
je.setCrc(crc.getValue());
jos.putNextEntry(je);
jos.write(bytes);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
private static byte[] toByteArray(InputStream is) throws IOException {
byte[] buffer = new byte[8192];
ByteArrayOutputStream boas = new ByteArrayOutputStream();
while (true) {
int r = is.read(buffer);
if (r == -1) {
break;
}
boas.write(buffer, 0, r);
}
return boas.toByteArray();
}
private static boolean isJdk9OrLater() {
return Double.parseDouble(System.getProperty("java.class.version")) >= 53.0;
}
}
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