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.model.Exclusion;
  import org.apache.maven.shared.dependency.graph.DependencyNode;
  import org.apache.maven.shared.dependency.graph.traversal.DependencyNodeVisitor;
  
  /**
   * Default implementation of a DependencyNode.
   */
  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;
  
      private Boolean optional;
  
      private List<Exclusion> exclusions;
  
      /**
       * Constructs the DefaultDependencyNode.
       *
       * @param parent            Parent node, may be {@code null}.
       * @param artifact          Artifact associated with this dependency.
       * @param premanagedVersion the premanaged version, may be {@code null}.
       * @param premanagedScope   the premanaged scope, may be {@code null}.
       * @param versionConstraint the version constraint, may be {@code null.}
       */
      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;
      }
  
      public DefaultDependencyNode( DependencyNode parent, Artifact artifact, String premanagedVersion,
                                    String premanagedScope, String versionConstraint, Boolean optional,
                                    List<Exclusion> exclusions )
      {
          this.parent = parent;
          this.artifact = artifact;
          this.premanagedVersion = premanagedVersion;
          this.premanagedScope = premanagedScope;
          this.versionConstraint = versionConstraint;
          this.optional = optional;
          this.exclusions = exclusions;
      }
      
      // user to refer to winner
      public DefaultDependencyNode( Artifact artifact )
      {
          this.artifact = artifact;
          this.parent = null;
          this.premanagedScope = null;
          this.premanagedVersion = null;
          this.versionConstraint = null;
      }
  
      /**
       * 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
       */
      @Override
     public boolean accept( DependencyNodeVisitor visitor )
     {
         if ( visitor.visit( this ) )
         {
             for ( DependencyNode child : getChildren() )
             {
                 if ( !child.accept( visitor ) )
                 {
                     break;
                 }
             }
         }
 
         return visitor.endVisit( this );
     }
 
     /**
      * @return Artifact for this DependencyNode.
      */
     @Override
     public Artifact getArtifact()
     {
         return artifact;
     }
 
     /**
      *
      * @param children  List of DependencyNode to set as child nodes.
      */
     public void setChildren( List<DependencyNode> children )
     {
         this.children = children;
     }
 
     /**
      * @return List of child nodes for this DependencyNode.
      */
     @Override
     public List<DependencyNode> getChildren()
     {
         return children;
     }
 
     /**
      * @return Parent of this DependencyNode.
      */
     @Override
     public DependencyNode getParent()
     {
         return parent;
     }
 
     @Override
     public String getPremanagedVersion()
     {
         return premanagedVersion;
     }
 
     @Override
     public String getPremanagedScope()
     {
         return premanagedScope;
     }
 
     @Override
     public String getVersionConstraint()
     {
         return versionConstraint;
     }
 
     @Override
     public Boolean getOptional()
     {
         return optional;
     }
 
     @Override
     public List<Exclusion> getExclusions()
     {
         return exclusions;
     }
 
     /**
      * @return Stringified representation of this DependencyNode.
      */
     @Override
     public String toNodeString()
     {
         return String.valueOf( artifact );
     }
 }