package org.eclipse.aether.internal.test.util;
   
   /*
    * 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.
   */
  
  import java.util.ArrayList;
  import java.util.Collection;
  
  import org.eclipse.aether.version.InvalidVersionSpecificationException;
  import org.eclipse.aether.version.Version;
  import org.eclipse.aether.version.VersionConstraint;
  import org.eclipse.aether.version.VersionRange;
  import org.eclipse.aether.version.VersionScheme;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * A version scheme using a generic version syntax.
   */
  final class TestVersionScheme
      implements VersionScheme
  {
  
      public Version parseVersion( final String version )
      {
          requireNonNull( version, "version cannot be null" );
          return new TestVersion( version );
      }
  
      public VersionRange parseVersionRange( final String range )
          throws InvalidVersionSpecificationException
      {
          requireNonNull( range, "range cannot be null" );
          return new TestVersionRange( range );
      }
  
      public VersionConstraint parseVersionConstraint( final String constraint )
          throws InvalidVersionSpecificationException
      {
          requireNonNull( constraint, "constraint cannot be null" );
          Collection<VersionRange> ranges = new ArrayList<>();
  
          String process = constraint;
  
          while ( process.startsWith( "[" ) || process.startsWith( "(" ) )
          {
              int index1 = process.indexOf( ')' );
              int index2 = process.indexOf( ']' );
  
              int index = index2;
              if ( index2 < 0 || ( index1 >= 0 && index1 < index2 ) )
              {
                  index = index1;
              }
  
              if ( index < 0 )
              {
                  throw new InvalidVersionSpecificationException( constraint, "Unbounded version range " + constraint );
              }
  
              VersionRange range = parseVersionRange( process.substring( 0, index + 1 ) );
              ranges.add( range );
  
              process = process.substring( index + 1 ).trim();
  
              if ( process.length() > 0 && process.startsWith( "," ) )
              {
                  process = process.substring( 1 ).trim();
              }
          }
  
          if ( process.length() > 0 && !ranges.isEmpty() )
          {
              throw new InvalidVersionSpecificationException( constraint, "Invalid version range " + constraint
                  + ", expected [ or ( but got " + process );
          }
  
          VersionConstraint result;
          if ( ranges.isEmpty() )
          {
              result = new TestVersionConstraint( parseVersion( constraint ) );
          }
          else
         {
             result = new TestVersionConstraint( ranges.iterator().next() );
         }
 
         return result;
     }
 
     @Override
     public boolean equals( final Object obj )
     {
         if ( this == obj )
         {
             return true;
         }
 
         return obj != null && getClass().equals( obj.getClass() );
     }
 
     @Override
     public int hashCode()
     {
         return getClass().hashCode();
     }
 
 }