org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/builder/ClasspathJrt.java - objectteams/org.eclipse.objectteams - Git at Google

 /*******************************************************************************
  * Copyright (c) 2016, 2019 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
  * which accompanies this distribution, and is available at
  * https://www.eclipse.org/legal/epl-2.0/
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.jdt.internal.core.builder;

 import java.io.File;
 import java.io.IOException;
 import java.nio.file.FileVisitResult;
 import java.nio.file.Path;
 import java.nio.file.attribute.BasicFileAttributes;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 import java.util.function.Predicate;
 import java.util.zip.ZipFile;

 import org.eclipse.core.runtime.IPath;
 import org.eclipse.jdt.core.compiler.CharOperation;
 import org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader;
 import org.eclipse.jdt.internal.compiler.classfmt.ClassFormatException;
 import org.eclipse.jdt.internal.compiler.classfmt.ExternalAnnotationDecorator;
 import org.eclipse.jdt.internal.compiler.env.AccessRuleSet;
 import org.eclipse.jdt.internal.compiler.env.IBinaryType;
 import org.eclipse.jdt.internal.compiler.env.IModule;
 import org.eclipse.jdt.internal.compiler.env.IModule.IModuleReference;
 import org.eclipse.jdt.internal.compiler.env.IMultiModuleEntry;
 import org.eclipse.jdt.internal.compiler.env.NameEnvironmentAnswer;
 import org.eclipse.jdt.internal.compiler.util.JRTUtil;
 import org.eclipse.jdt.internal.compiler.util.SimpleSet;
 import org.eclipse.jdt.internal.compiler.util.SuffixConstants;
 import org.eclipse.jdt.internal.core.JavaProject;

 public class ClasspathJrt extends ClasspathLocation implements IMultiModuleEntry {

 //private HashMap<String, SimpleSet> packagesInModule = null;
 protected static HashMap<String, HashMap<String, SimpleSet>> PackageCache = new HashMap<>();
 protected static HashMap<String, Set<IModule>> ModulesCache = new HashMap<>();
 String externalAnnotationPath;
 protected ZipFile annotationZipFile;
 String zipFilename; // keep for equals
 AccessRuleSet accessRuleSet;

 static final Set<String> NO_LIMIT_MODULES = new HashSet<>();

 /*
  * Only for use from ClasspathJrtWithOlderRelease
  */
 protected ClasspathJrt() {
 }
 public ClasspathJrt(String zipFilename, AccessRuleSet accessRuleSet, IPath externalAnnotationPath) {
 	this.zipFilename = zipFilename;
 	this.accessRuleSet = accessRuleSet;
 	if (externalAnnotationPath != null)
 		this.externalAnnotationPath = externalAnnotationPath.toString();
 	loadModules(this);
 }
 /**
  * Calculate and cache the package list available in the zipFile.
  * @param jrt The ClasspathJar to use
  * @return A SimpleSet with the all the package names in the zipFile.
  */
 static HashMap<String, SimpleSet> findPackagesInModules(final ClasspathJrt jrt) {
 	String zipFileName = jrt.zipFilename;
 	HashMap<String, SimpleSet> cache = PackageCache.get(jrt.getKey());
 	if (cache != null) {
 		return cache;
 	}
 	final HashMap<String, SimpleSet> packagesInModule = new HashMap<>();
 	PackageCache.put(zipFileName, packagesInModule);
 	try {
 		final File imageFile = new File(zipFileName);
 		org.eclipse.jdt.internal.compiler.util.JRTUtil.walkModuleImage(imageFile,
 				new org.eclipse.jdt.internal.compiler.util.JRTUtil.JrtFileVisitor<Path>() {
 			SimpleSet packageSet = null;
 			@Override
 			public FileVisitResult visitPackage(Path dir, Path mod, BasicFileAttributes attrs) throws IOException {
 				ClasspathJar.addToPackageSet(this.packageSet, dir.toString(), true);
 				return FileVisitResult.CONTINUE;
 			}

 			@Override
 			public FileVisitResult visitFile(Path file, Path mod, BasicFileAttributes attrs) throws IOException {
 				return FileVisitResult.CONTINUE;
 			}

 			@Override
 			public FileVisitResult visitModule(Path path, String name) throws IOException {
 				try {
 					jrt.acceptModule(JRTUtil.getClassfileContent(imageFile, IModule.MODULE_INFO_CLASS, name));
 				} catch (ClassFormatException e) {
 					e.printStackTrace();
 				}
 				this.packageSet = new SimpleSet(41);
 				this.packageSet.add(""); //$NON-NLS-1$
 				if (name.endsWith("/")) { //$NON-NLS-1$
 					name = name.substring(0, name.length() - 1);
 				}
 				packagesInModule.put(name, this.packageSet);
 				return FileVisitResult.CONTINUE;
 			}
 		}, JRTUtil.NOTIFY_PACKAGES | JRTUtil.NOTIFY_MODULES);
 	} catch (IOException e) {
 		// TODO: Java 9 Should report better
 	}
 	return packagesInModule;
 }

 public static void loadModules(final ClasspathJrt jrt) {
 	Set<IModule> cache = ModulesCache.get(jrt.getKey());

 	if (cache == null) {
 		try {
 			final File imageFile = new File(jrt.zipFilename);
 			org.eclipse.jdt.internal.compiler.util.JRTUtil.walkModuleImage(imageFile,
 					new org.eclipse.jdt.internal.compiler.util.JRTUtil.JrtFileVisitor<Path>() {
 				SimpleSet packageSet = null;

 				@Override
 				public FileVisitResult visitPackage(Path dir, Path mod, BasicFileAttributes attrs)
 						throws IOException {
 					ClasspathJar.addToPackageSet(this.packageSet, dir.toString(), true);
 					return FileVisitResult.CONTINUE;
 				}

 				@Override
 				public FileVisitResult visitFile(Path file, Path mod, BasicFileAttributes attrs)
 						throws IOException {
 					return FileVisitResult.CONTINUE;
 				}

 				@Override
 				public FileVisitResult visitModule(Path path, String name) throws IOException {
 					try {
 						jrt.acceptModule(JRTUtil.getClassfileContent(imageFile, IModule.MODULE_INFO_CLASS, name));
 					} catch (ClassFormatException e) {
 						e.printStackTrace();
 					}
 					return FileVisitResult.SKIP_SUBTREE;
 				}
 			}, JRTUtil.NOTIFY_MODULES);
 		} catch (IOException e) {
 			// TODO: Java 9 Should report better
 		}
 	} else {
 //		for (IModuleDeclaration iModule : cache) {
 //			jimage.env.acceptModule(iModule, jimage);
 //		}
 	}
 }
 protected String getKey() {
 	return this.zipFilename;
 }
 void acceptModule(byte[] content) {
 	if (content == null)
 		return;
 	ClassFileReader reader = null;
 	try {
 		reader = new ClassFileReader(content, IModule.MODULE_INFO_CLASS.toCharArray());
 	} catch (ClassFormatException e) {
 		e.printStackTrace();
 	}
 	if (reader != null) {
 		String key = getKey();
 		IModule moduleDecl = reader.getModuleDeclaration();
 		if (moduleDecl != null) {
 			Set<IModule> cache = ModulesCache.get(key);
 			if (cache == null) {
 				ModulesCache.put(key, cache = new HashSet<IModule>());
 			}
 			cache.add(moduleDecl);
 		}
 	}
 }
 @Override
 public void cleanup() {
 	if (this.annotationZipFile != null) {
 		try {
 			this.annotationZipFile.close();
 		} catch(IOException e) { // ignore it
 		}
 		this.annotationZipFile = null;
 	}
 }

 @Override
 public boolean equals(Object o) {
 	if (this == o) return true;
 	if (!(o instanceof ClasspathJrt)) return false;
 	ClasspathJrt jar = (ClasspathJrt) o;
 	if (this.accessRuleSet != jar.accessRuleSet)
 		if (this.accessRuleSet == null || !this.accessRuleSet.equals(jar.accessRuleSet))
 			return false;
 	return this.zipFilename.endsWith(jar.zipFilename) && areAllModuleOptionsEqual(jar);
 }

 @Override
 public NameEnvironmentAnswer findClass(String binaryFileName, String qualifiedPackageName, String moduleName, String qualifiedBinaryFileName,
 										boolean asBinaryOnly, Predicate<String> moduleNameFilter) {
 	if (!isPackage(qualifiedPackageName, moduleName)) return null; // most common case

 	try {
 		String fileNameWithoutExtension = qualifiedBinaryFileName.substring(0, qualifiedBinaryFileName.length() - SuffixConstants.SUFFIX_CLASS.length);
 		IBinaryType reader = ClassFileReader.readFromModule(new File(this.zipFilename), moduleName, qualifiedBinaryFileName, moduleNameFilter);
 		return createAnswer(fileNameWithoutExtension, reader);
 	} catch (ClassFormatException | IOException e) { // treat as if class file is missing
 	}
 	return null;
 }
 protected NameEnvironmentAnswer createAnswer(String fileNameWithoutExtension, IBinaryType reader) {
 	if (reader != null) {
 		if (this.externalAnnotationPath != null) {
 			try {
 				if (this.annotationZipFile == null) {
 					this.annotationZipFile = ExternalAnnotationDecorator.getAnnotationZipFile(this.externalAnnotationPath, null);
 				}
 				reader = ExternalAnnotationDecorator.create(reader, this.externalAnnotationPath, fileNameWithoutExtension, this.annotationZipFile);
 			} catch (IOException e) {
 				// don't let error on annotations fail class reading
 			}
 		}
 		if (this.accessRuleSet == null)
 			return new NameEnvironmentAnswer(reader, null, reader.getModule());
 		return new NameEnvironmentAnswer(reader,
 				this.accessRuleSet.getViolatedRestriction(fileNameWithoutExtension.toCharArray()),
 				reader.getModule());
 	}
 	return null;
 }

 @Override
 public IPath getProjectRelativePath() {
 	return null;
 }

 @Override
 public int hashCode() {
 	return this.zipFilename == null ? super.hashCode() : this.zipFilename.hashCode();
 }
 @Override
 public char[][] getModulesDeclaringPackage(String qualifiedPackageName, String moduleName) {
 	List<String> moduleNames = JRTUtil.getModulesDeclaringPackage(new File(this.zipFilename), qualifiedPackageName, moduleName);
 	return CharOperation.toCharArrays(moduleNames);
 }
 @Override
 public boolean hasCompilationUnit(String qualifiedPackageName, String moduleName) {
 	return JRTUtil.hasCompilationUnit(new File(this.zipFilename), qualifiedPackageName, moduleName);
 }
 @Override
 public boolean isPackage(String qualifiedPackageName, String moduleName) {
 	return JRTUtil.getModulesDeclaringPackage(new File(this.zipFilename), qualifiedPackageName, moduleName) != null;
 }

 @Override
 public String toString() {
 	String start = "Classpath jrt file " + this.zipFilename; //$NON-NLS-1$
 	return start;
 }

 @Override
 public String debugPathString() {
 	return this.zipFilename;
 }
 @Override
 public NameEnvironmentAnswer findClass(char[] typeName, String qualifiedPackageName, String moduleName, String qualifiedBinaryFileName,
 		boolean asBinaryOnly, Predicate<String> moduleNameFilter) {
 	String fileName = new String(typeName);
 	return findClass(fileName, qualifiedPackageName, moduleName, qualifiedBinaryFileName, asBinaryOnly, moduleNameFilter);
 }
 @Override
 public boolean hasModule() {
 	return true;
 }
 @Override
 public IModule getModule(char[] moduleName) {
 	Set<IModule> modules = ModulesCache.get(getKey());
 	if (modules != null) {
 		for (IModule mod : modules) {
 			if (CharOperation.equals(mod.name(), moduleName))
 					return mod;
 		}
 	}
 	return null;
 }
 @Override
 public Collection<String> getModuleNames(Collection<String> limitModules) {
 	HashMap<String, SimpleSet> cache = findPackagesInModules(this);
 	if (cache != null)
 		return selectModules(cache.keySet(), limitModules);
 	return Collections.emptyList();
 }

 protected Collection<String> selectModules(Set<String> keySet, Collection<String> limitModules) {
 	Collection<String> rootModules;
 	if (limitModules == NO_LIMIT_MODULES) {
 		rootModules = new HashSet<>(keySet);
 	} else if (limitModules != null) {
 		Set<String> result = new HashSet<>(keySet);
 		result.retainAll(limitModules);
 		rootModules = result;
 	} else {
 		rootModules = JavaProject.internalDefaultRootModules(keySet, s -> s, m -> getModule(m.toCharArray()));
 	}
 	Set<String> allModules = new HashSet<>(rootModules);
 	for (String mod : rootModules)
 		addRequired(mod, allModules);
 	return allModules;
 }

 protected void addRequired(String mod, Set<String> allModules) {
 	IModule iMod = getModule(mod.toCharArray());
 	if(iMod == null) {
 		return;
 	}
 	for (IModuleReference requiredRef : iMod.requires()) {
 		IModule reqMod = getModule(requiredRef.name());
 		if (reqMod != null) {
 			String reqModName = String.valueOf(reqMod.name());
 			if (allModules.add(reqModName))
 				addRequired(reqModName, allModules);
 		}
 	}
 }
 @Override
 public NameEnvironmentAnswer findClass(String typeName, String qualifiedPackageName, String moduleName, String qualifiedBinaryFileName) {
 	//
 	return findClass(typeName, qualifiedPackageName, moduleName, qualifiedBinaryFileName, false, null);
 }
 /** TEST ONLY */
 public static void resetCaches() {
 	PackageCache.clear();
 	ModulesCache.clear();
 }
 }
	/*******************************************************************************
	* Copyright (c) 2016, 2019 IBM Corporation and others.
	*
	* This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License 2.0
	* which accompanies this distribution, and is available at
	* https://www.eclipse.org/legal/epl-2.0/
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.jdt.internal.core.builder;

	import java.io.File;
	import java.io.IOException;
	import java.nio.file.FileVisitResult;
	import java.nio.file.Path;
	import java.nio.file.attribute.BasicFileAttributes;
	import java.util.Collection;
	import java.util.Collections;
	import java.util.HashMap;
	import java.util.HashSet;
	import java.util.List;
	import java.util.Set;
	import java.util.function.Predicate;
	import java.util.zip.ZipFile;

	import org.eclipse.core.runtime.IPath;
	import org.eclipse.jdt.core.compiler.CharOperation;
	import org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader;
	import org.eclipse.jdt.internal.compiler.classfmt.ClassFormatException;
	import org.eclipse.jdt.internal.compiler.classfmt.ExternalAnnotationDecorator;
	import org.eclipse.jdt.internal.compiler.env.AccessRuleSet;
	import org.eclipse.jdt.internal.compiler.env.IBinaryType;
	import org.eclipse.jdt.internal.compiler.env.IModule;
	import org.eclipse.jdt.internal.compiler.env.IModule.IModuleReference;
	import org.eclipse.jdt.internal.compiler.env.IMultiModuleEntry;
	import org.eclipse.jdt.internal.compiler.env.NameEnvironmentAnswer;
	import org.eclipse.jdt.internal.compiler.util.JRTUtil;
	import org.eclipse.jdt.internal.compiler.util.SimpleSet;
	import org.eclipse.jdt.internal.compiler.util.SuffixConstants;
	import org.eclipse.jdt.internal.core.JavaProject;

	public class ClasspathJrt extends ClasspathLocation implements IMultiModuleEntry {

	//private HashMap<String, SimpleSet> packagesInModule = null;
	protected static HashMap<String, HashMap<String, SimpleSet>> PackageCache = new HashMap<>();
	protected static HashMap<String, Set<IModule>> ModulesCache = new HashMap<>();
	String externalAnnotationPath;
	protected ZipFile annotationZipFile;
	String zipFilename; // keep for equals
	AccessRuleSet accessRuleSet;

	static final Set<String> NO_LIMIT_MODULES = new HashSet<>();

	/*
	* Only for use from ClasspathJrtWithOlderRelease
	*/
	protected ClasspathJrt() {
	}
	public ClasspathJrt(String zipFilename, AccessRuleSet accessRuleSet, IPath externalAnnotationPath) {
	this.zipFilename = zipFilename;
	this.accessRuleSet = accessRuleSet;
	if (externalAnnotationPath != null)
	this.externalAnnotationPath = externalAnnotationPath.toString();
	loadModules(this);
	}
	/**
	* Calculate and cache the package list available in the zipFile.
	* @param jrt The ClasspathJar to use
	* @return A SimpleSet with the all the package names in the zipFile.
	*/
	static HashMap<String, SimpleSet> findPackagesInModules(final ClasspathJrt jrt) {
	String zipFileName = jrt.zipFilename;
	HashMap<String, SimpleSet> cache = PackageCache.get(jrt.getKey());
	if (cache != null) {
	return cache;
	}
	final HashMap<String, SimpleSet> packagesInModule = new HashMap<>();
	PackageCache.put(zipFileName, packagesInModule);
	try {
	final File imageFile = new File(zipFileName);
	org.eclipse.jdt.internal.compiler.util.JRTUtil.walkModuleImage(imageFile,
	new org.eclipse.jdt.internal.compiler.util.JRTUtil.JrtFileVisitor<Path>() {
	SimpleSet packageSet = null;
	@Override
	public FileVisitResult visitPackage(Path dir, Path mod, BasicFileAttributes attrs) throws IOException {
	ClasspathJar.addToPackageSet(this.packageSet, dir.toString(), true);
	return FileVisitResult.CONTINUE;
	}

	@Override
	public FileVisitResult visitFile(Path file, Path mod, BasicFileAttributes attrs) throws IOException {
	return FileVisitResult.CONTINUE;
	}

	@Override
	public FileVisitResult visitModule(Path path, String name) throws IOException {
	try {
	jrt.acceptModule(JRTUtil.getClassfileContent(imageFile, IModule.MODULE_INFO_CLASS, name));
	} catch (ClassFormatException e) {
	e.printStackTrace();
	}
	this.packageSet = new SimpleSet(41);
	this.packageSet.add(""); //$NON-NLS-1$
	if (name.endsWith("/")) { //$NON-NLS-1$
	name = name.substring(0, name.length() - 1);
	}
	packagesInModule.put(name, this.packageSet);
	return FileVisitResult.CONTINUE;
	}
	}, JRTUtil.NOTIFY_PACKAGES \| JRTUtil.NOTIFY_MODULES);
	} catch (IOException e) {
	// TODO: Java 9 Should report better
	}
	return packagesInModule;
	}

	public static void loadModules(final ClasspathJrt jrt) {
	Set<IModule> cache = ModulesCache.get(jrt.getKey());

	if (cache == null) {
	try {
	final File imageFile = new File(jrt.zipFilename);
	org.eclipse.jdt.internal.compiler.util.JRTUtil.walkModuleImage(imageFile,
	new org.eclipse.jdt.internal.compiler.util.JRTUtil.JrtFileVisitor<Path>() {
	SimpleSet packageSet = null;

	@Override
	public FileVisitResult visitPackage(Path dir, Path mod, BasicFileAttributes attrs)
	throws IOException {
	ClasspathJar.addToPackageSet(this.packageSet, dir.toString(), true);
	return FileVisitResult.CONTINUE;
	}

	@Override
	public FileVisitResult visitFile(Path file, Path mod, BasicFileAttributes attrs)
	throws IOException {
	return FileVisitResult.CONTINUE;
	}

	@Override
	public FileVisitResult visitModule(Path path, String name) throws IOException {
	try {
	jrt.acceptModule(JRTUtil.getClassfileContent(imageFile, IModule.MODULE_INFO_CLASS, name));
	} catch (ClassFormatException e) {
	e.printStackTrace();
	}
	return FileVisitResult.SKIP_SUBTREE;
	}
	}, JRTUtil.NOTIFY_MODULES);
	} catch (IOException e) {
	// TODO: Java 9 Should report better
	}
	} else {
	// for (IModuleDeclaration iModule : cache) {
	// jimage.env.acceptModule(iModule, jimage);
	// }
	}
	}
	protected String getKey() {
	return this.zipFilename;
	}
	void acceptModule(byte[] content) {
	if (content == null)
	return;
	ClassFileReader reader = null;
	try {
	reader = new ClassFileReader(content, IModule.MODULE_INFO_CLASS.toCharArray());
	} catch (ClassFormatException e) {
	e.printStackTrace();
	}
	if (reader != null) {
	String key = getKey();
	IModule moduleDecl = reader.getModuleDeclaration();
	if (moduleDecl != null) {
	Set<IModule> cache = ModulesCache.get(key);
	if (cache == null) {
	ModulesCache.put(key, cache = new HashSet<IModule>());
	}
	cache.add(moduleDecl);
	}
	}
	}
	@Override
	public void cleanup() {
	if (this.annotationZipFile != null) {
	try {
	this.annotationZipFile.close();
	} catch(IOException e) { // ignore it
	}
	this.annotationZipFile = null;
	}
	}

	@Override
	public boolean equals(Object o) {
	if (this == o) return true;
	if (!(o instanceof ClasspathJrt)) return false;
	ClasspathJrt jar = (ClasspathJrt) o;
	if (this.accessRuleSet != jar.accessRuleSet)
	if (this.accessRuleSet == null \|\| !this.accessRuleSet.equals(jar.accessRuleSet))
	return false;
	return this.zipFilename.endsWith(jar.zipFilename) && areAllModuleOptionsEqual(jar);
	}

	@Override
	public NameEnvironmentAnswer findClass(String binaryFileName, String qualifiedPackageName, String moduleName, String qualifiedBinaryFileName,
	boolean asBinaryOnly, Predicate<String> moduleNameFilter) {
	if (!isPackage(qualifiedPackageName, moduleName)) return null; // most common case

	try {
	String fileNameWithoutExtension = qualifiedBinaryFileName.substring(0, qualifiedBinaryFileName.length() - SuffixConstants.SUFFIX_CLASS.length);
	IBinaryType reader = ClassFileReader.readFromModule(new File(this.zipFilename), moduleName, qualifiedBinaryFileName, moduleNameFilter);
	return createAnswer(fileNameWithoutExtension, reader);
	} catch (ClassFormatException \| IOException e) { // treat as if class file is missing
	}
	return null;
	}
	protected NameEnvironmentAnswer createAnswer(String fileNameWithoutExtension, IBinaryType reader) {
	if (reader != null) {
	if (this.externalAnnotationPath != null) {
	try {
	if (this.annotationZipFile == null) {
	this.annotationZipFile = ExternalAnnotationDecorator.getAnnotationZipFile(this.externalAnnotationPath, null);
	}
	reader = ExternalAnnotationDecorator.create(reader, this.externalAnnotationPath, fileNameWithoutExtension, this.annotationZipFile);
	} catch (IOException e) {
	// don't let error on annotations fail class reading
	}
	}
	if (this.accessRuleSet == null)
	return new NameEnvironmentAnswer(reader, null, reader.getModule());
	return new NameEnvironmentAnswer(reader,
	this.accessRuleSet.getViolatedRestriction(fileNameWithoutExtension.toCharArray()),
	reader.getModule());
	}
	return null;
	}

	@Override
	public IPath getProjectRelativePath() {
	return null;
	}

	@Override
	public int hashCode() {
	return this.zipFilename == null ? super.hashCode() : this.zipFilename.hashCode();
	}
	@Override
	public char[][] getModulesDeclaringPackage(String qualifiedPackageName, String moduleName) {
	List<String> moduleNames = JRTUtil.getModulesDeclaringPackage(new File(this.zipFilename), qualifiedPackageName, moduleName);
	return CharOperation.toCharArrays(moduleNames);
	}
	@Override
	public boolean hasCompilationUnit(String qualifiedPackageName, String moduleName) {
	return JRTUtil.hasCompilationUnit(new File(this.zipFilename), qualifiedPackageName, moduleName);
	}
	@Override
	public boolean isPackage(String qualifiedPackageName, String moduleName) {
	return JRTUtil.getModulesDeclaringPackage(new File(this.zipFilename), qualifiedPackageName, moduleName) != null;
	}

	@Override
	public String toString() {
	String start = "Classpath jrt file " + this.zipFilename; //$NON-NLS-1$
	return start;
	}

	@Override
	public String debugPathString() {
	return this.zipFilename;
	}
	@Override
	public NameEnvironmentAnswer findClass(char[] typeName, String qualifiedPackageName, String moduleName, String qualifiedBinaryFileName,
	boolean asBinaryOnly, Predicate<String> moduleNameFilter) {
	String fileName = new String(typeName);
	return findClass(fileName, qualifiedPackageName, moduleName, qualifiedBinaryFileName, asBinaryOnly, moduleNameFilter);
	}
	@Override
	public boolean hasModule() {
	return true;
	}
	@Override
	public IModule getModule(char[] moduleName) {
	Set<IModule> modules = ModulesCache.get(getKey());
	if (modules != null) {
	for (IModule mod : modules) {
	if (CharOperation.equals(mod.name(), moduleName))
	return mod;
	}
	}
	return null;
	}
	@Override
	public Collection<String> getModuleNames(Collection<String> limitModules) {
	HashMap<String, SimpleSet> cache = findPackagesInModules(this);
	if (cache != null)
	return selectModules(cache.keySet(), limitModules);
	return Collections.emptyList();
	}

	protected Collection<String> selectModules(Set<String> keySet, Collection<String> limitModules) {
	Collection<String> rootModules;
	if (limitModules == NO_LIMIT_MODULES) {
	rootModules = new HashSet<>(keySet);
	} else if (limitModules != null) {
	Set<String> result = new HashSet<>(keySet);
	result.retainAll(limitModules);
	rootModules = result;
	} else {
	rootModules = JavaProject.internalDefaultRootModules(keySet, s -> s, m -> getModule(m.toCharArray()));
	}
	Set<String> allModules = new HashSet<>(rootModules);
	for (String mod : rootModules)
	addRequired(mod, allModules);
	return allModules;
	}

	protected void addRequired(String mod, Set<String> allModules) {
	IModule iMod = getModule(mod.toCharArray());
	if(iMod == null) {
	return;
	}
	for (IModuleReference requiredRef : iMod.requires()) {
	IModule reqMod = getModule(requiredRef.name());
	if (reqMod != null) {
	String reqModName = String.valueOf(reqMod.name());
	if (allModules.add(reqModName))
	addRequired(reqModName, allModules);
	}
	}
	}
	@Override
	public NameEnvironmentAnswer findClass(String typeName, String qualifiedPackageName, String moduleName, String qualifiedBinaryFileName) {
	//
	return findClass(typeName, qualifiedPackageName, moduleName, qualifiedBinaryFileName, false, null);
	}
	/** TEST ONLY */
	public static void resetCaches() {
	PackageCache.clear();
	ModulesCache.clear();
	}
	}