package org.apache.maven.artifact.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;
              }
              return comparison >= 0;
          }
  
          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;
         }
 
         return upperBoundInclusive == restriction.upperBoundInclusive;
 
     }
 
     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();
     }
 }