org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/builder/ClasspathMultiReleaseJar.java

package org.eclipse.jdt.internal.core.builder;

import java.io.IOException;
import java.net.URI;
import java.nio.file.DirectoryStream;
import java.nio.file.FileSystemNotFoundException;
import java.nio.file.FileSystems;
import java.nio.file.FileVisitResult;
import java.nio.file.FileVisitor;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.ProviderNotFoundException;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.HashMap;
import java.util.function.Predicate;
import java.util.zip.ZipFile;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.IPath;
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.NameEnvironmentAnswer;
import org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.ExternalAnnotationStatus;
import org.eclipse.jdt.internal.compiler.util.SimpleSet;
import org.eclipse.jdt.internal.compiler.util.SuffixConstants;

public class ClasspathMultiReleaseJar extends ClasspathJar {
	private java.nio.file.FileSystem fs = null;
	Path releasePath = null;

	ClasspathMultiReleaseJar(IFile resource, AccessRuleSet accessRuleSet, IPath externalAnnotationPath, boolean isOnModulePath, String compliance) {
		super(resource, accessRuleSet, externalAnnotationPath, isOnModulePath);
		this.compliance = compliance;
		initializeVersions();
	}

	ClasspathMultiReleaseJar(String zipFilename, long lastModified, AccessRuleSet accessRuleSet, IPath externalAnnotationPath, boolean isOnModulePath, String compliance) {
		super(zipFilename, lastModified, accessRuleSet, externalAnnotationPath, isOnModulePath);
		this.compliance = compliance;
		initializeVersions();
	}

	public ClasspathMultiReleaseJar(ZipFile zipFile, AccessRuleSet accessRuleSet, IPath externalAnnotationPath, boolean isOnModulePath, String compliance) {
		this(zipFile.getName(), accessRuleSet, externalAnnotationPath, isOnModulePath, compliance);
		this.zipFile = zipFile;
		this.closeZipFileAtEnd = true;
	}

	public ClasspathMultiReleaseJar(String fileName, AccessRuleSet accessRuleSet, IPath externalAnnotationPath, boolean isOnModulePath, String compliance) {
		this(fileName, 0, accessRuleSet, externalAnnotationPath, isOnModulePath, compliance);
		if (externalAnnotationPath != null)
			this.externalAnnotationPath = externalAnnotationPath.toString();
	}
	private void initializeVersions() {
		Path filePath = Paths.get(this.zipFilename);
		if (Files.exists(filePath)) {
			URI uri = URI.create("jar:" + filePath.toUri());  //$NON-NLS-1$
			try {
				this.fs = FileSystems.getFileSystem(uri);
				if (this.fs == null) {
					HashMap<String, ?> env = new HashMap<>();
					this.fs = FileSystems.newFileSystem(uri, env);
				}
			} catch (FileSystemNotFoundException | ProviderNotFoundException e) {
				// move on
			} catch (IOException e) {
				// move on
			}
			if (this.fs == null) {
				this.releasePath = null;
			} else {
				this.releasePath = this.fs.getPath("/", "META-INF", "versions", this.compliance); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
				if (!Files.exists(this.releasePath)) {
					this.releasePath = null;
					try {
						this.fs.close();
					} catch (IOException e) {
						// ignore
					}
				}
			}
		}
	}
	@Override
	protected String readJarContent(final SimpleSet packageSet) {
		String[] modInfo = new String[1];
		modInfo[0] = super.readJarContent(packageSet);
		try {
			if (this.releasePath != null && Files.exists(this.releasePath)) {
				// go through the packages
				try (DirectoryStream<java.nio.file.Path> stream = Files.newDirectoryStream(this.releasePath)) {
					for (final java.nio.file.Path subdir: stream) {
						Files.walkFileTree(subdir, new FileVisitor<java.nio.file.Path>() {
							@Override
							public FileVisitResult preVisitDirectory(java.nio.file.Path dir, BasicFileAttributes attrs)
									throws IOException {
								return FileVisitResult.CONTINUE;
							}
							@Override
							public FileVisitResult visitFile(java.nio.file.Path file, BasicFileAttributes attrs)
									throws IOException {
								Path p = ClasspathMultiReleaseJar.this.releasePath.relativize(file);
								addToPackageSet(packageSet, p.toString(), false);
								if (modInfo[0] == null) {
									if (p.getFileName().toString().equalsIgnoreCase(IModule.MODULE_INFO_CLASS)) {
										 modInfo[0] = ClasspathMultiReleaseJar.this.releasePath.relativize(file).toString();
									}
								}
								return FileVisitResult.CONTINUE;
							}

							@Override
							public FileVisitResult visitFileFailed(java.nio.file.Path file, IOException exc) throws IOException {
								return FileVisitResult.CONTINUE;
							}

							@Override
							public FileVisitResult postVisitDirectory(java.nio.file.Path dir, IOException exc)
									throws IOException {
								return FileVisitResult.CONTINUE;
							}
						});
					}
				}
			}
		} catch (Exception e) {
			// move on;
		}
		return modInfo[0];
	}
	@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
		if (this.releasePath != null) {
			try {
				Path path = this.releasePath.resolve(qualifiedPackageName).resolve(binaryFileName);
				byte[] content = Files.readAllBytes(path);
				IBinaryType reader = null;
				if (content != null) {
					reader = new ClassFileReader(content, qualifiedBinaryFileName.toCharArray());
				}
				if (reader != null) {
					char[] modName = this.module == null ? null : this.module.name();
					if (reader instanceof ClassFileReader) {
						ClassFileReader classReader = (ClassFileReader) reader;
						if (classReader.moduleName == null)
							classReader.moduleName = modName;
						else
							modName = classReader.moduleName;
						}
					String fileNameWithoutExtension = qualifiedBinaryFileName.substring(0, qualifiedBinaryFileName.length() - SuffixConstants.SUFFIX_CLASS.length);
					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 (reader.getExternalAnnotationStatus() == ExternalAnnotationStatus.NOT_EEA_CONFIGURED) {
							// ensure a reader that answers NO_EEA_FILE
							reader = new ExternalAnnotationDecorator(reader, null);
						}
					}
					if (this.accessRuleSet == null)
						return new NameEnvironmentAnswer(reader, null, modName);
					return new NameEnvironmentAnswer(reader, 
							this.accessRuleSet.getViolatedRestriction(fileNameWithoutExtension.toCharArray()), 
							modName);
				}
			} catch (IOException | ClassFormatException e) {
				// treat as if class file is missing
			}
		}
		return super.findClass(binaryFileName, qualifiedPackageName, moduleName, qualifiedBinaryFileName, asBinaryOnly, moduleNameFilter);
	}
}