/*
 * 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 org.ultramine.bootstrap.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;
	}

	@Override
	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();
	}
}