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/*
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* reserved comment block
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* DO NOT REMOVE OR ALTER!
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*/
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package com.sun.org.apache.bcel.internal.util;
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import java.io.Closeable;
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import java.io.File;
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import java.io.IOException;
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import java.net.URI;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.nio.file.DirectoryStream;
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import java.nio.file.FileSystem;
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import java.nio.file.FileSystems;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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/**
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* Wraps a Java 9 JEP 220 modular runtime image. Requires the JRT NIO file system.
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*
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* @since 6.3
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*/
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public class ModularRuntimeImage implements Closeable {
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static final String MODULES_PATH = File.separator + "modules";
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static final String PACKAGES_PATH = File.separator + "packages";
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private final URLClassLoader classLoader;
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private final FileSystem fileSystem;
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/**
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* Constructs a default instance.
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*
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* @throws IOException
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* an I/O error occurs accessing the file system
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*/
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public ModularRuntimeImage() throws IOException {
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this(null, FileSystems.getFileSystem(URI.create("jrt:/")));
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}
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/**
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* Constructs an instance using the JRT file system implementation from a specific Java Home.
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*
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* @param javaHome
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* Path to a Java 9 or greater home.
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*
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* @throws IOException
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* an I/O error occurs accessing the file system
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*/
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public ModularRuntimeImage(final String javaHome) throws IOException {
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final Map<String, ?> emptyMap = Collections.emptyMap();
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final Path jrePath = Paths.get(javaHome);
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final Path jrtFsPath = jrePath.resolve("lib").resolve("jrt-fs.jar");
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this.classLoader = new URLClassLoader(new URL[] {jrtFsPath.toUri().toURL() });
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this.fileSystem = FileSystems.newFileSystem(URI.create("jrt:/"), emptyMap, classLoader);
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}
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private ModularRuntimeImage(final URLClassLoader cl, final FileSystem fs) {
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this.classLoader = cl;
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this.fileSystem = fs;
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}
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@Override
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public void close() throws IOException {
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if (classLoader != null) {
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if (classLoader != null) {
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classLoader.close();
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}
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if (fileSystem != null) {
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fileSystem.close();
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}
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}
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}
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/**
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* Lists all entries in the given directory.
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*
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* @param dirPath
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* directory path.
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* @return a list of dir entries if an I/O error occurs
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* @throws IOException
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* an I/O error occurs accessing the file system
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*/
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public List<Path> list(final Path dirPath) throws IOException {
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final List<Path> list = new ArrayList<>();
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try (DirectoryStream<Path> ds = Files.newDirectoryStream(dirPath)) {
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final Iterator<Path> iterator = ds.iterator();
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while (iterator.hasNext()) {
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list.add(iterator.next());
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}
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}
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return list;
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}
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/**
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* Lists all entries in the given directory.
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*
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* @param dirName
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* directory path.
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* @return a list of dir entries if an I/O error occurs
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* @throws IOException
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* an I/O error occurs accessing the file system
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*/
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public List<Path> list(final String dirName) throws IOException {
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return list(fileSystem.getPath(dirName));
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}
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/**
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* Lists all modules.
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*
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* @return a list of modules
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* @throws IOException
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* an I/O error occurs accessing the file system
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*/
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public List<Path> modules() throws IOException {
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return list(MODULES_PATH);
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}
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/**
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* Lists all packages.
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*
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* @return a list of modules
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* @throws IOException
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* an I/O error occurs accessing the file system
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*/
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public List<Path> packages() throws IOException {
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return list(PACKAGES_PATH);
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}
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public FileSystem getFileSystem() {
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return fileSystem;
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}
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}
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