/*

 * Copyright (c) 2012, 2014, 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.jdeps;

import com.sun.tools.classfile.Dependency.Location;

import java.io.Closeable;

import java.io.IOException;

import java.io.UncheckedIOException;

import java.net.URI;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.HashSet;

import java.util.Map;

import java.util.Objects;

import java.util.Set;

import java.util.concurrent.ConcurrentHashMap;

import java.util.stream.Stream;

/**

 * Represents the source of the class files.

 */

public class Archive implements Closeable {

    public static Archive getInstance(Path p, Runtime.Version version) {

        try {

            return new Archive(p, ClassFileReader.newInstance(p, version));

        } catch (IOException e) {

            throw new UncheckedIOException(e);

        }

    }

    private final URI location;

    private final Path path;

    private final String filename;

    private final ClassFileReader reader;

    protected Map<Location, Set<Location>> deps = new ConcurrentHashMap<>();

    protected Archive(String name) {

        this(name, null, null);

    }

    protected Archive(String name, URI location, ClassFileReader reader) {

        this.location = location;

        this.path = location != null ? Paths.get(location) : null;

        this.filename = name;

        this.reader = reader;

    }

    protected Archive(Path p, ClassFileReader reader) {

        this.location = null;

        this.path = p;

        this.filename = path.getFileName().toString();

        this.reader = reader;

    }

    public ClassFileReader reader() {

        return reader;

    }

    public String getName() {

        return filename;

    }

    public Module getModule() {

        return Module.UNNAMED_MODULE;

    }

    public boolean contains(String entry) {

        return reader.entries().contains(entry);

    }

    public void addClass(Location origin) {

        deps.computeIfAbsent(origin, _k -> new HashSet<>());

    }

    public void addClass(Location origin, Location target) {

        deps.computeIfAbsent(origin, _k -> new HashSet<>()).add(target);

    }

    public Set<Location> getClasses() {

        return deps.keySet();

    }

    public Stream<Location> getDependencies() {

        return deps.values().stream()

                   .flatMap(Set::stream);

    }

    public boolean hasDependences() {

        return getDependencies().count() > 0;

    }

    public void visitDependences(Visitor v) {

        for (Map.Entry<Location,Set<Location>> e: deps.entrySet()) {

            for (Location target : e.getValue()) {

                v.visit(e.getKey(), target);

            }

        }

    }

    /**

     * Tests if any class has been parsed.

     */

    public boolean isEmpty() {

        return getClasses().isEmpty();

    }

    public String getPathName() {

        return path != null ? path.toString() : filename;

    }

    @Override

    public int hashCode() {

        return Objects.hash(this.filename, this.path);

    }

    @Override

    public boolean equals(Object o) {

        if (o instanceof Archive) {

            Archive other = (Archive)o;

            if (path == other.path || isSameLocation(this, other))

                return true;

        }

        return false;

    }

    @Override

    public String toString() {

        return filename;

    }

    public Path path() {

        return path;

    }

    public static boolean isSameLocation(Archive archive, Archive other) {

        if (archive.path == null || other.path == null)

            return false;

        if (archive.location != null && other.location != null &&

                archive.location.equals(other.location)) {

            return true;

        }

        if (archive.isJrt() || other.isJrt()) {

            return false;

        }

        try {

            return Files.isSameFile(archive.path, other.path);

        } catch (IOException e) {

            throw new UncheckedIOException(e);

        }

    }

    private boolean isJrt() {

        return location != null && location.getScheme().equals("jrt");

    }

    @Override

    public void close() throws IOException {

        if (reader != null)

            reader.close();

    }

    interface Visitor {

        void visit(Location origin, Location target);

    }

}