/*
 * Forge Mod Loader
 * Copyright (c) 2012-2013 cpw.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser Public License v2.1
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 *
 * Contributors:
 *     cpw - implementation
 */

package cpw.mods.fml.common.versioning;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/**
 * Describes a restriction in versioning.
 *
 * @author <a href="mailto:brett@apache.org">Brett Porter</a>
 */
public class Restriction
{
    private final ArtifactVersion lowerBound;

    private final boolean lowerBoundInclusive;

    private final ArtifactVersion upperBound;

    private final boolean upperBoundInclusive;

    public static final Restriction EVERYTHING = new Restriction(null, false, null, false);

    public Restriction(ArtifactVersion lowerBound, boolean lowerBoundInclusive, ArtifactVersion upperBound,
                       boolean upperBoundInclusive)
    {
        this.lowerBound = lowerBound;
        this.lowerBoundInclusive = lowerBoundInclusive;
        this.upperBound = upperBound;
        this.upperBoundInclusive = upperBoundInclusive;
    }

    public ArtifactVersion getLowerBound()
    {
        return lowerBound;
    }

    public boolean isLowerBoundInclusive()
    {
        return lowerBoundInclusive;
    }

    public ArtifactVersion getUpperBound()
    {
        return upperBound;
    }

    public boolean isUpperBoundInclusive()
    {
        return upperBoundInclusive;
    }

    public boolean containsVersion(ArtifactVersion version)
    {
        if (lowerBound != null)
        {
            int comparison = lowerBound.compareTo(version);

            if ((comparison == 0) && !lowerBoundInclusive)
            {
                return false;
            }

            if (comparison > 0)
            {
                return false;
            }
        }

        if (upperBound != null)
        {
            int comparison = upperBound.compareTo(version);

            if ((comparison == 0) && !upperBoundInclusive)
            {
                return false;
            }

            if (comparison < 0)
            {
                return false;
            }
        }

        return true;
    }

    @Override
    public int hashCode()
    {
        int result = 13;

        if (lowerBound == null)
        {
            result += 1;
        }
        else
        {
            result += lowerBound.hashCode();
        }

        result *= lowerBoundInclusive ? 1 : 2;

        if (upperBound == null)
        {
            result -= 3;
        }
        else
        {
            result -= upperBound.hashCode();
        }

        result *= upperBoundInclusive ? 2 : 3;
        return result;
    }

    @Override
    public boolean equals(Object other)
    {
        if (this == other)
        {
            return true;
        }

        if (!(other instanceof Restriction))
        {
            return false;
        }

        Restriction restriction = (Restriction) other;

        if (lowerBound != null)
        {
            if (!lowerBound.equals(restriction.lowerBound))
            {
                return false;
            }
        }
        else if (restriction.lowerBound != null)
        {
            return false;
        }

        if (lowerBoundInclusive != restriction.lowerBoundInclusive)
        {
            return false;
        }

        if (upperBound != null)
        {
            if (!upperBound.equals(restriction.upperBound))
            {
                return false;
            }
        }
        else if (restriction.upperBound != null)
        {
            return false;
        }

        if (upperBoundInclusive != restriction.upperBoundInclusive)
        {
            return false;
        }

        return true;
    }

    public String toString()
    {
        StringBuilder buf = new StringBuilder();
        buf.append(isLowerBoundInclusive() ? "[" : "(");

        if (getLowerBound() != null)
        {
            buf.append(getLowerBound().toString());
        }

        buf.append(",");

        if (getUpperBound() != null)
        {
            buf.append(getUpperBound().toString());
        }

        buf.append(isUpperBoundInclusive() ? "]" : ")");
        return buf.toString();
    }
}
