package org.apache.maven.resolver.internal.ant.types;
   
   /*
    * 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.io.File;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.tools.ant.BuildException;
  import org.apache.tools.ant.Task;
  import org.apache.tools.ant.types.DataType;
  import org.apache.tools.ant.types.Reference;
  
  /**
   */
  public class Dependencies
      extends DataType
      implements DependencyContainer
  {
  
      private File file;
  
      private Pom pom;
  
      private List<DependencyContainer> containers = new ArrayList<DependencyContainer>();
  
      private List<Exclusion> exclusions = new ArrayList<Exclusion>();
  
      private boolean nestedDependencies;
  
      protected Dependencies getRef()
      {
          return (Dependencies) getCheckedRef();
      }
  
      public void validate( Task task )
      {
          if ( isReference() )
          {
              getRef().validate( task );
          }
          else
          {
              if ( getPom() != null && getPom().getFile() == null )
              {
                  throw new BuildException( "A <pom> used for dependency resolution has to be backed by a pom.xml file" );
              }
              Map<String, String> ids = new HashMap<String, String>();
              for ( DependencyContainer container : containers )
              {
                  container.validate( task );
                  if ( container instanceof Dependency )
                  {
                      Dependency dependency = (Dependency) container;
                      String id = dependency.getVersionlessKey();
                      String collision = ids.put( id, dependency.getVersion() );
                      if ( collision != null )
                      {
                          throw new BuildException( "You must not declare multiple <dependency> elements"
                              + " with the same coordinates but got " + id + " -> " + collision + " vs "
                              + dependency.getVersion() );
                      }
                  }
              }
          }
      }
  
      public void setRefid( Reference ref )
      {
          if ( pom != null || !exclusions.isEmpty() || !containers.isEmpty() )
          {
              throw noChildrenAllowed();
          }
          super.setRefid( ref );
      }
  
      public void setFile( File file )
      {
          checkAttributesAllowed();
          this.file = file;
         checkExternalSources();
     }
 
     public File getFile()
     {
         if ( isReference() )
         {
             return getRef().getFile();
         }
         return file;
     }
 
     public void addPom( Pom pom )
     {
         checkChildrenAllowed();
         if ( this.pom != null )
         {
             throw new BuildException( "You must not specify multiple <pom> elements" );
         }
         this.pom = pom;
         checkExternalSources();
     }
 
     public Pom getPom()
     {
         if ( isReference() )
         {
             return getRef().getPom();
         }
         return pom;
     }
 
     public void setPomRef( Reference ref )
     {
         if ( pom == null )
         {
             pom = new Pom();
             pom.setProject( getProject() );
         }
         pom.setRefid( ref );
         checkExternalSources();
     }
 
     private void checkExternalSources()
     {
         if ( file != null && pom != null )
         {
             throw new BuildException( "You must not specify both a text file and a POM to list dependencies" );
         }
         if ( ( file != null || pom != null ) && nestedDependencies )
         {
             throw new BuildException( "You must not specify both a file/POM and nested dependency collections" );
         }
     }
 
     public void addDependency( Dependency dependency )
     {
         checkChildrenAllowed();
         containers.add( dependency );
     }
 
     public void addDependencies( Dependencies dependencies )
     {
         checkChildrenAllowed();
         if ( dependencies == this )
         {
             throw circularReference();
         }
         containers.add( dependencies );
         nestedDependencies = true;
         checkExternalSources();
     }
 
     public List<DependencyContainer> getDependencyContainers()
     {
         if ( isReference() )
         {
             return getRef().getDependencyContainers();
         }
         return containers;
     }
 
     public void addExclusion( Exclusion exclusion )
     {
         checkChildrenAllowed();
         this.exclusions.add( exclusion );
     }
 
     public List<Exclusion> getExclusions()
     {
         if ( isReference() )
         {
             return getRef().getExclusions();
         }
         return exclusions;
     }
 
 }