319 lines
10 KiB
Java
319 lines
10 KiB
Java
/*
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* Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.tools.javac.nio;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.OutputStream;
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import java.io.OutputStreamWriter;
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import java.io.Reader;
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import java.io.Writer;
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import java.net.URI;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.charset.CharsetDecoder;
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import java.nio.file.Files;
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import java.nio.file.LinkOption;
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import java.nio.file.Path;
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import javax.lang.model.element.Modifier;
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import javax.lang.model.element.NestingKind;
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import javax.tools.JavaFileObject;
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import com.sun.tools.javac.util.BaseFileManager;
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/**
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* Implementation of JavaFileObject using java.nio.file API.
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*
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* <p>PathFileObjects are, for the most part, straightforward wrappers around
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* Path objects. The primary complexity is the support for "inferBinaryName".
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* This is left as an abstract method, implemented by each of a number of
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* different factory methods, which compute the binary name based on
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* information available at the time the file object is created.
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*
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* <p><b>This is NOT part of any supported API.
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* If you write code that depends on this, you do so at your own risk.
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* This code and its internal interfaces are subject to change or
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* deletion without notice.</b>
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*/
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abstract class PathFileObject implements JavaFileObject {
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private JavacPathFileManager fileManager;
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private Path path;
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/**
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* Create a PathFileObject within a directory, such that the binary name
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* can be inferred from the relationship to the parent directory.
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*/
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static PathFileObject createDirectoryPathFileObject(JavacPathFileManager fileManager,
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final Path path, final Path dir) {
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return new PathFileObject(fileManager, path) {
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@Override
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String inferBinaryName(Iterable<? extends Path> paths) {
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return toBinaryName(dir.relativize(path));
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}
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};
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}
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/**
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* Create a PathFileObject in a file system such as a jar file, such that
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* the binary name can be inferred from its position within the filesystem.
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*/
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static PathFileObject createJarPathFileObject(JavacPathFileManager fileManager,
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final Path path) {
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return new PathFileObject(fileManager, path) {
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@Override
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String inferBinaryName(Iterable<? extends Path> paths) {
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return toBinaryName(path);
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}
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};
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}
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/**
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* Create a PathFileObject whose binary name can be inferred from the
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* relative path to a sibling.
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*/
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static PathFileObject createSiblingPathFileObject(JavacPathFileManager fileManager,
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final Path path, final String relativePath) {
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return new PathFileObject(fileManager, path) {
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@Override
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String inferBinaryName(Iterable<? extends Path> paths) {
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return toBinaryName(relativePath, "/");
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}
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};
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}
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/**
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* Create a PathFileObject whose binary name might be inferred from its
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* position on a search path.
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*/
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static PathFileObject createSimplePathFileObject(JavacPathFileManager fileManager,
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final Path path) {
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return new PathFileObject(fileManager, path) {
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@Override
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String inferBinaryName(Iterable<? extends Path> paths) {
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Path absPath = path.toAbsolutePath();
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for (Path p: paths) {
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Path ap = p.toAbsolutePath();
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if (absPath.startsWith(ap)) {
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try {
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Path rp = ap.relativize(absPath);
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if (rp != null) // maybe null if absPath same as ap
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return toBinaryName(rp);
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} catch (IllegalArgumentException e) {
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// ignore this p if cannot relativize path to p
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}
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}
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}
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return null;
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}
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};
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}
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protected PathFileObject(JavacPathFileManager fileManager, Path path) {
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fileManager.getClass(); // null check
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path.getClass(); // null check
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this.fileManager = fileManager;
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this.path = path;
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}
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abstract String inferBinaryName(Iterable<? extends Path> paths);
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/**
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* Return the Path for this object.
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* @return the Path for this object.
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*/
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Path getPath() {
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return path;
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}
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@Override
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public Kind getKind() {
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return BaseFileManager.getKind(path.getFileName().toString());
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}
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@Override
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public boolean isNameCompatible(String simpleName, Kind kind) {
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simpleName.getClass();
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// null check
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if (kind == Kind.OTHER && getKind() != kind) {
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return false;
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}
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String sn = simpleName + kind.extension;
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String pn = path.getFileName().toString();
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if (pn.equals(sn)) {
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return true;
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}
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if (pn.equalsIgnoreCase(sn)) {
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try {
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// allow for Windows
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return path.toRealPath(LinkOption.NOFOLLOW_LINKS).getFileName().toString().equals(sn);
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} catch (IOException e) {
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}
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}
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return false;
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}
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@Override
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public NestingKind getNestingKind() {
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return null;
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}
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@Override
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public Modifier getAccessLevel() {
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return null;
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}
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@Override
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public URI toUri() {
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return path.toUri();
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}
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@Override
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public String getName() {
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return path.toString();
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}
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@Override
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public InputStream openInputStream() throws IOException {
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return Files.newInputStream(path);
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}
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@Override
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public OutputStream openOutputStream() throws IOException {
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fileManager.flushCache(this);
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ensureParentDirectoriesExist();
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return Files.newOutputStream(path);
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}
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@Override
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public Reader openReader(boolean ignoreEncodingErrors) throws IOException {
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CharsetDecoder decoder = fileManager.getDecoder(fileManager.getEncodingName(), ignoreEncodingErrors);
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return new InputStreamReader(openInputStream(), decoder);
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}
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@Override
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public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
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CharBuffer cb = fileManager.getCachedContent(this);
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if (cb == null) {
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InputStream in = openInputStream();
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try {
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ByteBuffer bb = fileManager.makeByteBuffer(in);
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JavaFileObject prev = fileManager.log.useSource(this);
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try {
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cb = fileManager.decode(bb, ignoreEncodingErrors);
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} finally {
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fileManager.log.useSource(prev);
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}
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fileManager.recycleByteBuffer(bb);
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if (!ignoreEncodingErrors) {
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fileManager.cache(this, cb);
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}
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} finally {
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in.close();
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}
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}
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return cb;
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}
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@Override
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public Writer openWriter() throws IOException {
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fileManager.flushCache(this);
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ensureParentDirectoriesExist();
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return new OutputStreamWriter(Files.newOutputStream(path), fileManager.getEncodingName());
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}
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@Override
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public long getLastModified() {
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try {
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return Files.getLastModifiedTime(path).toMillis();
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} catch (IOException e) {
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return -1;
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}
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}
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@Override
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public boolean delete() {
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try {
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Files.delete(path);
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return true;
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} catch (IOException e) {
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return false;
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}
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}
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public boolean isSameFile(PathFileObject other) {
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try {
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return Files.isSameFile(path, other.path);
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} catch (IOException e) {
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return false;
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}
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}
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@Override
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public boolean equals(Object other) {
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return (other instanceof PathFileObject && path.equals(((PathFileObject) other).path));
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}
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@Override
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public int hashCode() {
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return path.hashCode();
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}
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@Override
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public String toString() {
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return getClass().getSimpleName() + "[" + path + "]";
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}
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private void ensureParentDirectoriesExist() throws IOException {
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Path parent = path.getParent();
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if (parent != null)
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Files.createDirectories(parent);
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}
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private long size() {
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try {
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return Files.size(path);
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} catch (IOException e) {
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return -1;
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}
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}
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protected static String toBinaryName(Path relativePath) {
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return toBinaryName(relativePath.toString(),
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relativePath.getFileSystem().getSeparator());
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}
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protected static String toBinaryName(String relativePath, String sep) {
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return removeExtension(relativePath).replace(sep, ".");
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}
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protected static String removeExtension(String fileName) {
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int lastDot = fileName.lastIndexOf(".");
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return (lastDot == -1 ? fileName : fileName.substring(0, lastDot));
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}
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}
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