/*

 * Copyright (c) 2005, 2009, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.tools.javac.file;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.Writer;

import java.net.URI;

import java.nio.ByteBuffer;

import java.nio.CharBuffer;

import java.nio.charset.CharsetDecoder;

import java.util.Enumeration;

import java.util.HashMap;

import java.util.Map;

import java.util.Set;

import java.util.zip.ZipEntry;

import java.util.zip.ZipFile;

import javax.tools.JavaFileObject;

import com.sun.tools.javac.file.JavacFileManager.Archive;

import com.sun.tools.javac.file.RelativePath.RelativeDirectory;

import com.sun.tools.javac.file.RelativePath.RelativeFile;

import com.sun.tools.javac.util.List;

import java.lang.ref.Reference;

import java.lang.ref.SoftReference;

/**

 * <p><b>This is NOT part of any supported API.

 * If you write code that depends on this, you do so at your own risk.

 * This code and its internal interfaces are subject to change or

 * deletion without notice.</b>

 */

public class ZipArchive implements Archive {

    public ZipArchive(JavacFileManager fm, ZipFile zfile) throws IOException {

        this(fm, zfile, true);

    }

    protected ZipArchive(JavacFileManager fm, ZipFile zfile, boolean initMap) throws IOException {

        this.fileManager = fm;

        this.zfile = zfile;

        this.map = new HashMap<>();

        if (initMap)

            initMap();

    }

    protected void initMap() throws IOException {

        for (Enumeration<? extends ZipEntry> e = zfile.entries(); e.hasMoreElements(); ) {

            ZipEntry entry;

            try {

                entry = e.nextElement();

            } catch (InternalError ex) {

                IOException io = new IOException();

                io.initCause(ex); // convenience constructors added in Mustang :-(

                throw io;

            }

            addZipEntry(entry);

        }

    }

    void addZipEntry(ZipEntry entry) {

        String name = entry.getName();

        int i = name.lastIndexOf('/');

        RelativeDirectory dirname = new RelativeDirectory(name.substring(0, i+1));

        String basename = name.substring(i+1);

        if (basename.length() == 0)

            return;

        List<String> list = map.get(dirname);

        if (list == null)

            list = List.nil();

        list = list.prepend(basename);

        map.put(dirname, list);

    }

    public boolean contains(RelativePath name) {

        RelativeDirectory dirname = name.dirname();

        String basename = name.basename();

        if (basename.length() == 0)

            return false;

        List<String> list = map.get(dirname);

        return (list != null && list.contains(basename));

    }

    public List<String> getFiles(RelativeDirectory subdirectory) {

        return map.get(subdirectory);

    }

    public JavaFileObject getFileObject(RelativeDirectory subdirectory, String file) {

        ZipEntry ze = new RelativeFile(subdirectory, file).getZipEntry(zfile);

        return new ZipFileObject(this, file, ze);

    }

    public Set<RelativeDirectory> getSubdirectories() {

        return map.keySet();

    }

    public void close() throws IOException {

        zfile.close();

    }

    @Override

    public String toString() {

        return "ZipArchive[" + zfile.getName() + "]";

    }

    private File getAbsoluteFile() {

        File absFile = (absFileRef == null ? null : absFileRef.get());

        if (absFile == null) {

            absFile = new File(zfile.getName()).getAbsoluteFile();

            absFileRef = new SoftReference<>(absFile);

        }

        return absFile;

    }

    /**

     * The file manager that created this archive.

     */

    protected JavacFileManager fileManager;

    /**

     * The index for the contents of this archive.

     */

    protected final Map<RelativeDirectory,List<String>> map;

    /**

     * The zip file for the archive.

     */

    protected final ZipFile zfile;

    /**

     * A reference to the absolute filename for the zip file for the archive.

     */

    protected Reference<File> absFileRef;

    /**

     * A subclass of JavaFileObject representing zip entries.

     */

    public static class ZipFileObject extends BaseFileObject {

        private String name;

        ZipArchive zarch;

        ZipEntry entry;

        protected ZipFileObject(ZipArchive zarch, String name, ZipEntry entry) {

            super(zarch.fileManager);

            this.zarch = zarch;

            this.name = name;

            this.entry = entry;

        }

        public URI toUri() {

            File zipFile = new File(zarch.zfile.getName());

            return createJarUri(zipFile, entry.getName());

        }

        @Override

        public String getName() {

            return zarch.zfile.getName() + "(" + entry.getName() + ")";

        }

        @Override

        public String getShortName() {

            return new File(zarch.zfile.getName()).getName() + "(" + entry + ")";

        }

        @Override

        public JavaFileObject.Kind getKind() {

            return getKind(entry.getName());

        }

        @Override

        public InputStream openInputStream() throws IOException {

            return zarch.zfile.getInputStream(entry);

        }

        @Override

        public OutputStream openOutputStream() throws IOException {

            throw new UnsupportedOperationException();

        }

        @Override

        public CharBuffer getCharContent(boolean ignoreEncodingErrors) throws IOException {

            CharBuffer cb = fileManager.getCachedContent(this);

            if (cb == null) {

                try (InputStream in = zarch.zfile.getInputStream(entry)) {

                    ByteBuffer bb = fileManager.makeByteBuffer(in);

                    JavaFileObject prev = fileManager.log.useSource(this);

                    try {

                        cb = fileManager.decode(bb, ignoreEncodingErrors);

                    } finally {

                        fileManager.log.useSource(prev);

                    }

                    fileManager.recycleByteBuffer(bb);

                    if (!ignoreEncodingErrors) {

                        fileManager.cache(this, cb);

                    }

                }

            }

            return cb;

        }

        @Override

        public Writer openWriter() throws IOException {

            throw new UnsupportedOperationException();

        }

        @Override

        public long getLastModified() {

            return entry.getTime();

        }

        @Override

        public boolean delete() {

            throw new UnsupportedOperationException();

        }

        @Override

        protected CharsetDecoder getDecoder(boolean ignoreEncodingErrors) {

            return fileManager.getDecoder(fileManager.getEncodingName(), ignoreEncodingErrors);

        }

        @Override

        protected String inferBinaryName(Iterable<? extends File> path) {

            String entryName = entry.getName();

            return removeExtension(entryName).replace('/', '.');

        }

        @Override

        public boolean isNameCompatible(String cn, JavaFileObject.Kind k) {

            cn.getClass();

            // null check

            if (k == Kind.OTHER && getKind() != k) {

                return false;

            }

            return name.equals(cn + k.extension);

        }

        /**

         * Check if two file objects are equal.

         * Two ZipFileObjects are equal if the absolute paths of the underlying

         * zip files are equal and if the paths within those zip files are equal.

         */

        @Override

        public boolean equals(Object other) {

            if (this == other)

                return true;

            if (!(other instanceof ZipFileObject))

                return false;

            ZipFileObject o = (ZipFileObject) other;

            return zarch.getAbsoluteFile().equals(o.zarch.getAbsoluteFile())

                    && name.equals(o.name);

        }

        @Override

        public int hashCode() {

            return zarch.getAbsoluteFile().hashCode() + name.hashCode();

        }

    }

}