/*

 * Copyright (c) 2016, 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

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package com.sun.tools.jdeps;

import com.sun.tools.classfile.ClassFile;

import com.sun.tools.classfile.ConstantPoolException;

import java.util.Map;

import java.util.concurrent.ConcurrentHashMap;

import java.util.jar.JarEntry;

import java.util.jar.JarFile;

public class VersionHelper {

    private static final String META_INF_VERSIONS = "META-INF/versions/";

    private static final Map<String,String> nameToVersion = new ConcurrentHashMap<>();

    public static String get(String classname) {

        if (nameToVersion.containsKey(classname)) {

            return nameToVersion.get(classname) + "/" + classname;

        }

        return classname;

    }

    public static void add(JarFile jarfile, JarEntry e, ClassFile cf)

            throws ConstantPoolException

    {

        String realName = e.getRealName();

        if (realName.startsWith(META_INF_VERSIONS)) {

            int len = META_INF_VERSIONS.length();

            int n = realName.indexOf('/', len);

            if (n > 0) {

                String version = realName.substring(len, n);

                assert (Integer.parseInt(version) > 8);

                String name = cf.getName().replace('/', '.');

                if (nameToVersion.containsKey(name)) {

                    if (!version.equals(nameToVersion.get(name))) {

                        throw new MultiReleaseException(

                                "err.multirelease.version.associated",

                                name, nameToVersion.get(name), version

                        );

                    }

                } else {

                    nameToVersion.put(name, version);

                }

            } else {

                throw new MultiReleaseException("err.multirelease.jar.malformed",

                        jarfile.getName(), realName);

            }

        }

    }

}