package org.apache.maven.doxia.sink;
   
   /*
    * 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.Collections;
  import java.util.Enumeration;
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  import javax.swing.text.AttributeSet;
  
  /**
   * Implementation of MutableAttributeSet using a LinkedHashMap.
   *
   * @author ltheussl
   * @version $Id: SinkEventAttributeSet.java 1185112 2011-10-17 11:33:00Z ltheussl $
   * @since 1.1
   */
  public class SinkEventAttributeSet
      implements SinkEventAttributes, Cloneable
  {
      /**
       * An unmodifiable attribute set containing only an underline attribute.
       */
      public static final SinkEventAttributes UNDERLINE;
  
      /**
       * An unmodifiable attribute set containing only an overline attribute.
       */
      public static final SinkEventAttributes OVERLINE;
  
      /**
       * An unmodifiable attribute set containing only a linethrough attribute.
       */
      public static final SinkEventAttributes LINETHROUGH;
  
      /**
       * An unmodifiable attribute set containing only a boxed attribute.
       */
      public static final SinkEventAttributes BOXED;
  
      /**
       * An unmodifiable attribute set containing only a bold attribute.
       */
      public static final SinkEventAttributes BOLD;
  
      /**
       * An unmodifiable attribute set containing only an italic attribute.
       */
      public static final SinkEventAttributes ITALIC;
  
      /**
       * An unmodifiable attribute set containing only a monospaced attribute.
       */
      public static final SinkEventAttributes MONOSPACED;
  
      /**
       * An unmodifiable attribute set containing only a left attribute.
       */
      public static final SinkEventAttributes LEFT;
  
      /**
       * An unmodifiable attribute set containing only a right attribute.
       */
      public static final SinkEventAttributes RIGHT;
  
      /**
       * An unmodifiable attribute set containing only a center attribute.
       */
      public static final SinkEventAttributes CENTER;
  
      /**
       * An unmodifiable attribute set containing only a justify attribute.
       */
      public static final SinkEventAttributes JUSTIFY;
  
  
      static
      {
          UNDERLINE = new SinkEventAttributeSet( new String[] {DECORATION, "underline"} ).unmodifiable();
          OVERLINE = new SinkEventAttributeSet( new String[] {DECORATION, "overline"} ).unmodifiable();
          LINETHROUGH = new SinkEventAttributeSet( new String[] {DECORATION, "line-through"} ).unmodifiable();
         BOXED = new SinkEventAttributeSet( new String[] {DECORATION, "boxed"} ).unmodifiable();
 
         BOLD = new SinkEventAttributeSet( new String[] {STYLE, "bold"} ).unmodifiable();
         ITALIC = new SinkEventAttributeSet( new String[] {STYLE, "italic"} ).unmodifiable();
         MONOSPACED = new SinkEventAttributeSet( new String[] {STYLE, "monospaced"} ).unmodifiable();
 
         LEFT = new SinkEventAttributeSet( new String[] {ALIGN, "left"} ).unmodifiable();
         RIGHT = new SinkEventAttributeSet( new String[] {ALIGN, "right"} ).unmodifiable();
         CENTER = new SinkEventAttributeSet( new String[] {ALIGN, "center"} ).unmodifiable();
         JUSTIFY = new SinkEventAttributeSet( new String[] {ALIGN, "justify"} ).unmodifiable();
     }
 
     private Map<String, Object> attribs;
 
     private AttributeSet resolveParent;
 
     /**
      * Constructs a new, empty SinkEventAttributeSet with default size 5.
      */
     public SinkEventAttributeSet()
     {
         this( 5 );
     }
 
     /**
      * Constructs a new, empty SinkEventAttributeSet with the specified initial size.
      *
      * @param size the initial number of attribs.
      */
     public SinkEventAttributeSet( int size )
     {
         attribs = new LinkedHashMap<String, Object>( size );
     }
 
     /**
      * Constructs a new SinkEventAttributeSet with the attribute name-value
      * mappings as given by the specified String array.
      *
      * @param attributes the specified String array. If the length of this array
      * is not an even number, an IllegalArgumentException is thrown.
      */
     public SinkEventAttributeSet( String[] attributes )
     {
         int n = attributes.length;
 
         if ( ( n % 2 ) != 0 )
         {
             throw new IllegalArgumentException( "Missing attribute!" );
         }
 
         attribs = new LinkedHashMap<String, Object>( n / 2 );
 
         for ( int i = 0; i < n; i += 2 )
         {
             attribs.put( attributes[i], attributes[i + 1] );
         }
     }
 
     /**
      * Constructs a new SinkEventAttributeSet with the same attribute name-value
      * mappings as in the specified AttributeSet.
      *
      * @param attributes the specified AttributeSet.
      */
     public SinkEventAttributeSet( AttributeSet attributes )
     {
         attribs = new LinkedHashMap<String, Object>( attributes.getAttributeCount() );
 
         Enumeration<?> names = attributes.getAttributeNames();
 
         while ( names.hasMoreElements() )
         {
             Object name = names.nextElement();
 
             attribs.put( name.toString(), attributes.getAttribute( name ) );
         }
     }
 
     /**
      * Replace this AttributeSet by an unmodifiable view of itself.
      * Any subsequent attempt to add, remove or modify the underlying mapping
      * will result in an UnsupportedOperationException.
      *
      * @return an unmodifiable view of this AttributeSet.
      *
      * @since 1.1.1
      */
     public SinkEventAttributeSet unmodifiable()
     {
         this.attribs = Collections.unmodifiableMap( attribs );
 
         return this;
     }
 
     /**
      * Checks whether the set of attribs is empty.
      *
      * @return true if the set is empty.
      */
     public boolean isEmpty()
     {
         return attribs.isEmpty();
     }
 
     /** {@inheritDoc} */
     public int getAttributeCount()
     {
         return attribs.size();
     }
 
     /** {@inheritDoc} */
     public boolean isDefined( Object attrName )
     {
         return attribs.containsKey( attrName );
     }
 
     /** {@inheritDoc} */
     public boolean isEqual( AttributeSet attr )
     {
         return ( ( getAttributeCount() == attr.getAttributeCount() )
                 && containsAttributes( attr ) );
     }
 
     /** {@inheritDoc} */
     public AttributeSet copyAttributes()
     {
         return ( (AttributeSet) clone() );
     }
 
     /** {@inheritDoc} */
     public Enumeration<String> getAttributeNames()
     {
         return Collections.enumeration( attribs.keySet() );
     }
 
     /** {@inheritDoc} */
     public Object getAttribute( Object key  )
     {
         Object value = attribs.get( key  );
 
         if ( value == null )
         {
             AttributeSet parent = getResolveParent();
 
             if ( parent != null )
             {
                 value = parent.getAttribute( key  );
             }
         }
 
         return value;
     }
 
     /** {@inheritDoc} */
     public boolean containsAttribute( Object name, Object value )
     {
         return value.equals( getAttribute( name ) );
     }
 
     /** {@inheritDoc} */
     public boolean containsAttributes( AttributeSet attributes )
     {
         boolean result = true;
 
         Enumeration<?> names = attributes.getAttributeNames();
 
         while ( result && names.hasMoreElements() )
         {
             Object name = names.nextElement();
             result = attributes.getAttribute( name ).equals( getAttribute( name ) );
         }
 
         return result;
     }
 
     /**
      * {@inheritDoc}
      *
      * Adds an attribute with the given name and value.
      */
     public void addAttribute( Object name, Object value )
     {
         attribs.put( name.toString(), value );
     }
 
     /** {@inheritDoc} */
     public void addAttributes( AttributeSet attributes  )
     {
         if ( attributes == null || attributes.getAttributeCount() == 0 )
         {
             return;
         }
 
         Enumeration<?> names = attributes.getAttributeNames();
 
         while ( names.hasMoreElements() )
         {
             Object name = names.nextElement();
 
             addAttribute( name, attributes.getAttribute( name ) );
         }
     }
 
     /** {@inheritDoc} */
     public void removeAttribute( Object name )
     {
         attribs.remove( name );
     }
 
     /** {@inheritDoc} */
     public void removeAttributes( Enumeration<?> names )
     {
         while ( names.hasMoreElements() )
         {
             removeAttribute( names.nextElement() );
         }
     }
 
     /** {@inheritDoc} */
     public void removeAttributes( AttributeSet attributes  )
     {
         if ( attributes == null )
         {
             return;
         }
         else if ( attributes == this )
         {
             attribs.clear();
         }
         else
         {
             Enumeration<?> names = attributes.getAttributeNames();
 
             while ( names.hasMoreElements() )
             {
                 Object name = names.nextElement();
                 Object value = attributes.getAttribute( name );
 
                 if ( value.equals( getAttribute( name ) ) )
                 {
                     removeAttribute( name );
                 }
             }
         }
     }
 
     /** {@inheritDoc} */
     public AttributeSet getResolveParent()
     {
         return this.resolveParent;
     }
 
     /** {@inheritDoc} */
     public void setResolveParent( AttributeSet parent )
     {
         this.resolveParent = parent;
     }
 
     /** {@inheritDoc} */
     @Override
     public Object clone()
     {
         SinkEventAttributeSet attr = new SinkEventAttributeSet( attribs.size() );
         attr.attribs = new LinkedHashMap<String, Object>( attribs );
 
         if ( resolveParent != null )
         {
             attr.resolveParent = resolveParent.copyAttributes();
         }
 
         return attr;
     }
 
     /** {@inheritDoc} */
     @Override
     public int hashCode()
     {
         final int parentHash = ( resolveParent == null ? 0 : resolveParent.hashCode() );
 
         return attribs.hashCode() + parentHash;
     }
 
     /** {@inheritDoc} */
     @Override
     public boolean equals( Object obj )
     {
         if ( this == obj )
         {
             return true;
         }
 
         if ( obj instanceof SinkEventAttributeSet )
         {
             return isEqual( (SinkEventAttributeSet) obj  );
         }
 
         return false;
     }
 
     /** {@inheritDoc} */
     @Override
     public String toString()
     {
         StringBuilder s = new StringBuilder();
         Enumeration<String> names = getAttributeNames();
 
         while ( names.hasMoreElements() )
         {
             String key = names.nextElement();
             String value = getAttribute( key ).toString();
 
             s.append( ' ' ).append( key ).append( '=' ).append( value );
         }
 
         return s.toString();
     }
 
 }