package org.apache.maven.shared.utils.xml;
   
   /*
    * 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.IOException;
  import java.io.StringWriter;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  
  import javax.annotation.Nonnull;
  
  /**
   * A reimplementation of Plexus Xpp3Dom based on the public interface of Plexus Xpp3Dom.
   *
   * @author Kristian Rosenvold
   */
  public class Xpp3Dom
      implements Iterable<Xpp3Dom>
  {
      private static final long serialVersionUID = 2567894443061173996L;
  
      private String name; // plexus: protected
  
      private String value; // plexus: protected
  
      private Map<String, String> attributes; // plexus: protected
  
      final List<Xpp3Dom> childList; // plexus: protected
  
      final Map<String, Xpp3Dom> childMap; // plexus: protected
  
      private Xpp3Dom parent; // plexus: protected
  
      /**
       * The attribute which identifies merge/append.
       */
      public static final String CHILDREN_COMBINATION_MODE_ATTRIBUTE = "combine.children";
  
      private static final String CHILDREN_COMBINATION_MERGE = "merge";
  
      /**
       * The attribute append.
       */
      public static final String CHILDREN_COMBINATION_APPEND = "append";
  
      @SuppressWarnings( "UnusedDeclaration" )
      private static final String DEFAULT_CHILDREN_COMBINATION_MODE = CHILDREN_COMBINATION_MERGE; // plexus: public
  
      /**
       * The name of the attribute.
       */
      public static final String SELF_COMBINATION_MODE_ATTRIBUTE = "combine.self";
  
      /**
       * The attributes which identifies <code>override</code>.
       */
      public static final String SELF_COMBINATION_OVERRIDE = "override";  // plexus: public
  
      /**
       * The attribute which identifies <code>merge</code>
       */
      public static final String SELF_COMBINATION_MERGE = "merge";
  
      @SuppressWarnings( "UnusedDeclaration" )
      private static final String DEFAULT_SELF_COMBINATION_MODE = SELF_COMBINATION_MERGE;  // plexus: public
  
      private static final String[] EMPTY_STRING_ARRAY = new String[0];
      private static final Xpp3Dom[] EMPTY_DOM_ARRAY = new Xpp3Dom[0];
  
      /**
       * @param name The name of the instance.
       */
      public Xpp3Dom( String name )
      {
          this.name = name;
          childList = new ArrayList<Xpp3Dom>();
          childMap = new HashMap<String, Xpp3Dom>();
      }
 
     /**
      * Create instance.
      * @param source The source.
      */
     public Xpp3Dom( Xpp3Dom source )
     {
         this( source, source.getName() );
     }
 
     /**
      * Create instance.
      * @param src The source Dom.
      * @param name The name of the Dom.
      */
     public Xpp3Dom( @Nonnull Xpp3Dom src, String name )
     {
         this.name = name;
 
         int size = src.getChildCount();
         childList = new ArrayList<Xpp3Dom>( size );
         childMap = new HashMap<String, Xpp3Dom>();
 
         setValue( src.getValue() );
 
         for ( String attributeName : src.getAttributeNames() )
         {
             setAttribute( attributeName, src.getAttribute( attributeName ) );
         }
 
         for ( Xpp3Dom xpp3Dom : src.getChildren() )
         {
             addChild( new Xpp3Dom( xpp3Dom ) );
         }
     }
 
     /**
      * @return The current name.
      */
     public String getName()
     {
         return name;
     }
 
     /**
      * @return The current value.
      */
     @Nonnull public String getValue()
     {
         return value;
     }
 
     /**
      * @param value The value to be set.
      */
     public void setValue( @Nonnull String value )
     {
         this.value = value;
     }
 
 
     /**
      * @return The array of attribute names.
      */
     public String[] getAttributeNames()
     {
         boolean isNothing = attributes == null || attributes.isEmpty();
         return isNothing ? EMPTY_STRING_ARRAY :  attributes.keySet().toArray( new String[attributes.size()] );
     }
 
 
     /**
      * @param nameParameter The name of the attribute.
      * @return The attribute value.
      */
     public String getAttribute( String nameParameter )
     {
         return this.attributes != null ? this.attributes.get( nameParameter ) : null;
     }
 
     /**
      * @param nameParameter The name of the attribute.
      * @param valueParameter The value of the attribute.
      */
     public void setAttribute( @Nonnull String nameParameter, @Nonnull String valueParameter )
     {
         if ( valueParameter == null )
         {
             throw new NullPointerException( "value can not be null" );
         }
         if ( nameParameter == null )
         {
             throw new NullPointerException( "name can not be null" );
         }
         if ( attributes == null )
         {
             attributes = new HashMap<String, String>();
         }
 
         attributes.put( nameParameter, valueParameter );
     }
 
     /**
      * @param i The index to be selected.
      * @return The child selected by index.
      */
     public Xpp3Dom getChild( int i )
     {
         return childList.get( i );
     }
 
     /**
      * @param nameParameter The name of the child.
      * @return The child selected by name.
      */
     public Xpp3Dom getChild( String nameParameter )
     {
         return childMap.get( nameParameter );
     }
 
     /**
      * @param child The child to be added.
      */
     public void addChild( Xpp3Dom child )
     {
         child.setParent( this );
         childList.add( child );
         childMap.put( child.getName(), child );
     }
 
     /**
      * @return The array of childs.
      */
     public Xpp3Dom[] getChildren()
     {
         boolean isNothing = childList == null || childList.isEmpty();
         return isNothing ? EMPTY_DOM_ARRAY : childList.toArray( new Xpp3Dom[childList.size()] );
     }
 
     private List<Xpp3Dom> getChildrenList()
     {
         boolean isNothing = childList == null || childList.isEmpty();
         return isNothing ? Collections.<Xpp3Dom>emptyList() : childList;
     }
 
     /**
      * @param nameParameter The name of the child.
      * @return The array of the Dom.
      */
     public Xpp3Dom[] getChildren( String nameParameter )
     {
         List<Xpp3Dom> children = getChildrenList( nameParameter );
         return children.toArray( new Xpp3Dom[children.size()] );
     }
 
     List<Xpp3Dom> getChildrenList( String nameParameter )
     {
         if ( childList == null )
         {
             return Collections.emptyList();
         }
         else
         {
             ArrayList<Xpp3Dom> children = new ArrayList<Xpp3Dom>();
             for ( Xpp3Dom aChildList : childList )
             {
                 if ( nameParameter.equals( aChildList.getName() ) )
                 {
                     children.add( aChildList );
                 }
             }
             return children;
         }
     }
 
     /**
      * @return The number of childs.
      */
     public int getChildCount()
     {
         if ( childList == null )
         {
             return 0;
         }
 
         return childList.size();
     }
 
     /**
      * @param i The child to be removed.
      */
     public void removeChild( int i )
     {
         Xpp3Dom child = childList.remove( i );
         childMap.values().remove( child );
         child.setParent( null );
     }
 
     /**
      * @return The current parent.
      */
     public Xpp3Dom getParent()
     {
         return parent;
     }
 
     /**
      * @param parent Set the parent.
      */
     public void setParent( Xpp3Dom parent )
     {
        this.parent = parent;
     }
 
     // Todo: Support writing to serializer (>1.0)
   //  public void writeToSerializer( String namespace, XmlSerializer serializer )
     //        throws IOException
 
     private static Xpp3Dom merge( Xpp3Dom dominant, Xpp3Dom recessive, Boolean childMergeOverride )
     {
         return Xpp3DomUtils.merge( dominant, recessive, childMergeOverride );
     }
 
     /**
      * @param dominant The dominant part.
      * @param recessive The recessive part.
      * @param childMergeOverride true if child merge will take precedence false otherwise.
      * @return The merged Xpp3Dom.
      */
     public static Xpp3Dom mergeXpp3Dom( Xpp3Dom dominant, Xpp3Dom recessive, Boolean childMergeOverride )
     {
         return Xpp3DomUtils.mergeXpp3Dom( dominant, recessive, childMergeOverride );
     }
 
     /**
      * @param dominant The dominant part.
      * @param recessive The recessive part.
      * @return The merged Xpp3Dom.
      */
     public static Xpp3Dom mergeXpp3Dom( Xpp3Dom dominant, Xpp3Dom recessive )
     {
         return Xpp3DomUtils.mergeXpp3Dom( dominant, recessive );
     }
 
     /** {@inheritDoc} */
     public boolean equals( Object obj )
     {
         if ( obj == this )
         {
             return true;
         }
 
         if ( !( obj instanceof Xpp3Dom ) )
         {
             return false;
         }
 
         Xpp3Dom dom = (Xpp3Dom) obj;
 
         return !( name == null ? dom.name != null : !name.equals( dom.name ) )
             && !( value == null ? dom.value != null : !value.equals( dom.value ) )
             && !( attributes == null ? dom.attributes != null : !attributes.equals( dom.attributes ) )
             && !( childList == null ? dom.childList != null : !childList.equals( dom.childList ) );
     }
 
     /** {@inheritDoc} */
     public int hashCode()
     {
         int result = 17;
         result = 37 * result + ( name != null ? name.hashCode() : 0 );
         result = 37 * result + ( value != null ? value.hashCode() : 0 );
         result = 37 * result + ( attributes != null ? attributes.hashCode() : 0 );
         result = 37 * result + ( childList != null ? childList.hashCode() : 0 );
         return result;
     }
 
     /** {@inheritDoc} */
     public String toString()
     {
         try
         {
             StringWriter writer = new StringWriter();
             Xpp3DomWriter.write( getPrettyPrintXMLWriter( writer ), this );
             return writer.toString();
         }
         catch ( final IOException e )
         {
             // JDK error in StringWriter.
             throw (AssertionError) new AssertionError( "Unexpected IOException from StringWriter." ).initCause( e );
         }
     }
 
     /**
      * @return Unescaped string.
      */
     public String toUnescapedString()
     {
         try
         {
             StringWriter writer = new StringWriter();
             Xpp3DomWriter.write( getPrettyPrintXMLWriter( writer ), this, false );
             return writer.toString();
         }
         catch ( final IOException e )
         {
             // JDK error in StringWriter.
             throw (AssertionError) new AssertionError( "Unexpected IOException from StringWriter." ).initCause( e );
         }
     }
 
     private PrettyPrintXMLWriter getPrettyPrintXMLWriter( StringWriter writer )
     {
         return new PrettyPrintXMLWriter( writer, "UTF-8", null );
     }
 
     /**
      * @param str The string to be checked.
      * @return true if the string is not empty (length &gt; 0) and not <code>null</code>.
      */
     public static boolean isNotEmpty( String str )
     {
         return str != null && str.length() > 0;
     }
 
     /**
      * @param str The string to be checked.
      * @return true if the string is empty or <code>null</code>.
      */
     public static boolean isEmpty( String str )
     {
         return str == null || str.trim().length() == 0;
     }
 
     /** {@inheritDoc} */
     public Iterator<Xpp3Dom> iterator()
     {
         return getChildrenList().iterator();
     }
 }