package org.apache.maven.shared.dependency.graph.internal;
   
   /*
    * 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.List;
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.shared.dependency.graph.DependencyNode;
  import org.apache.maven.shared.dependency.graph.traversal.DependencyNodeVisitor;
  
  public class DefaultDependencyNode
      implements DependencyNode
  {
      private final Artifact artifact;
  
      private final DependencyNode parent;
  
      private final String premanagedVersion;
  
      private final String premanagedScope;
  
      private final String versionConstraint;
  
      private List<DependencyNode> children;
  
      public DefaultDependencyNode( DependencyNode parent, Artifact artifact, String premanagedVersion,
                                    String premanagedScope, String versionConstraint )
      {
          this.parent = parent;
          this.artifact = artifact;
          this.premanagedVersion = premanagedVersion;
          this.premanagedScope = premanagedScope;
          this.versionConstraint = versionConstraint;
      }
  
      /**
       * Applies the specified dependency node visitor to this dependency node and its children.
       * 
       * @param visitor
       *            the dependency node visitor to use
       * @return the visitor result of ending the visit to this node
       * @since 1.1
       */
      public boolean accept( DependencyNodeVisitor visitor )
      {
          if ( visitor.visit( this ) )
          {
              for ( DependencyNode child : getChildren() )
              {
                  if ( !child.accept( visitor ) )
                  {
                      break;
                  }
              }
          }
  
          return visitor.endVisit( this );
      }
  
      public Artifact getArtifact()
      {
          return artifact;
      }
  
      public void setChildren( List<DependencyNode> children )
      {
          this.children = children;
      }
  
      public List<DependencyNode> getChildren()
      {
          return children;
      }
  
      public DependencyNode getParent()
      {
          return parent;
      }
  
      public String getPremanagedVersion()
      {
          return premanagedVersion;
     }
 
     public String getPremanagedScope()
     {
         return premanagedScope;
     }
 
     public String getVersionConstraint()
     {
         return versionConstraint;
     }
 
     public String toNodeString()
     {
         StringBuffer buffer = new StringBuffer();
 
         buffer.append( artifact );
         
         ItemAppender appender = new ItemAppender( buffer, " (", "; ", ")" );
 
         if ( getPremanagedVersion() != null )
         {
             appender.append( "version managed from ", getPremanagedVersion() );
         }
             
         if ( getPremanagedScope() != null )
         {
             appender.append( "scope managed from ", getPremanagedScope() );
         }
         
         if ( getVersionConstraint() != null )
         {
             appender.append( "version selected from constraint ", getVersionConstraint() );
         }
         
         appender.flush();
 
         return buffer.toString();
     }
 
     /**
      * Utility class to concatenate a number of parameters with separator tokens.   
      */
     private static class ItemAppender
     {
         private StringBuffer buffer;
         
         private String startToken;
         
         private String separatorToken;
         
         private String endToken;
         
         private boolean appended;
         
         public ItemAppender( StringBuffer buffer, String startToken, String separatorToken, String endToken )
         {
             this.buffer = buffer;
             this.startToken = startToken;
             this.separatorToken = separatorToken;
             this.endToken = endToken;
             
             appended = false;
         }
 
         public ItemAppender append( String item1, String item2 )
         {
             appendToken();
             
             buffer.append( item1 ).append( item2 );
             
             return this;
         }
         
         public void flush()
         {
             if ( appended )
             {
                 buffer.append( endToken );
                 
                 appended = false;
             }
         }
         
         private void appendToken()
         {
             buffer.append( appended ? separatorToken : startToken );
             
             appended = true;
         }
     }
 }