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    1   /*
    2    * Copyright (c) 2004 World Wide Web Consortium,
    3    *
    4    * (Massachusetts Institute of Technology, European Research Consortium for
    5    * Informatics and Mathematics, Keio University). All Rights Reserved. This
    6    * work is distributed under the W3C(r) Software License [1] in the hope that
    7    * it will be useful, but WITHOUT ANY WARRANTY; without even the implied
    8    * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    9    *
   10    * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
   11    */
   12   
   13   package org.w3c.dom;
   14   
   15   /**
   16    * When associating an object to a key on a node using 
   17    * <code>Node.setUserData()</code> the application can provide a handler 
   18    * that gets called when the node the object is associated to is being 
   19    * cloned, imported, or renamed. This can be used by the application to 
   20    * implement various behaviors regarding the data it associates to the DOM 
   21    * nodes. This interface defines that handler. 
   22    * <p>See also the <a href='http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407'>Document Object Model (DOM) Level 3 Core Specification</a>.
   23    * @since DOM Level 3
   24    */
   25   public interface UserDataHandler {
   26       // OperationType
   27       /**
   28        * The node is cloned, using <code>Node.cloneNode()</code>.
   29        */
   30       public static final short NODE_CLONED               = 1;
   31       /**
   32        * The node is imported, using <code>Document.importNode()</code>.
   33        */
   34       public static final short NODE_IMPORTED             = 2;
   35       /**
   36        * The node is deleted.
   37        * <p ><b>Note:</b> This may not be supported or may not be reliable in 
   38        * certain environments, such as Java, where the implementation has no 
   39        * real control over when objects are actually deleted.
   40        */
   41       public static final short NODE_DELETED              = 3;
   42       /**
   43        * The node is renamed, using <code>Document.renameNode()</code>.
   44        */
   45       public static final short NODE_RENAMED              = 4;
   46       /**
   47        * The node is adopted, using <code>Document.adoptNode()</code>.
   48        */
   49       public static final short NODE_ADOPTED              = 5;
   50   
   51       /**
   52        * This method is called whenever the node for which this handler is 
   53        * registered is imported or cloned.
   54        * <br> DOM applications must not raise exceptions in a 
   55        * <code>UserDataHandler</code>. The effect of throwing exceptions from 
   56        * the handler is DOM implementation dependent. 
   57        * @param operation Specifies the type of operation that is being 
   58        *   performed on the node.
   59        * @param key Specifies the key for which this handler is being called. 
   60        * @param data Specifies the data for which this handler is being called. 
   61        * @param src Specifies the node being cloned, adopted, imported, or 
   62        *   renamed. This is <code>null</code> when the node is being deleted.
   63        * @param dst Specifies the node newly created if any, or 
   64        *   <code>null</code>.
   65        */
   66       public void handle(short operation, 
   67                          String key, 
   68                          Object data, 
   69                          Node src, 
   70                          Node dst);
   71   
   72   }

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