BranchTreeNode xref

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    1   /*
    2    * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
    3    *
    4    * This software is open source.
    5    * See the bottom of this file for the licence.
    6    */
    7
    8   package org.dom4j.swing;
    9
    10  import java.util.ArrayList;
    11  import java.util.Enumeration;
    12  import java.util.List;
    13
    14  import javax.swing.tree.TreeNode;
    15
    16  import org.dom4j.Branch;
    17  import org.dom4j.CharacterData;
    18  import org.dom4j.Node;
    19
    20  /***
    21   * <p>
    22   * <code>BranchTreeNode</code> implements the Swing TreeNode interface to bind
    23   * dom4j XML Branch nodes (i.e. Document and Element nodes) to a Swing
    24   * TreeModel.
    25   * </p>
    26   *
    27   * @author <a href="mailto:james.strachan@metastuff.com">James Strachan </a>
    28   * @author Jakob Jenkov
    29   * @version $Revision: 1.10 $
    30   */
    31  public class BranchTreeNode extends LeafTreeNode {
    32      /*** Stores the child tree nodes */
    33      protected List children;
    34
    35      public BranchTreeNode() {
    36      }
    37
    38      public BranchTreeNode(Branch xmlNode) {
    39          super(xmlNode);
    40      }
    41
    42      public BranchTreeNode(TreeNode parent, Branch xmlNode) {
    43          super(parent, xmlNode);
    44      }
    45
    46      // TreeNode methods
    47      // -------------------------------------------------------------------------
    48      public Enumeration children() {
    49          return new Enumeration() {
    50              private int index = -1;
    51
    52              public boolean hasMoreElements() {
    53                  return (index + 1) < getChildCount();
    54              }
    55
    56              public Object nextElement() {
    57                  return getChildAt(++index);
    58              }
    59          };
    60      }
    61
    62      public boolean getAllowsChildren() {
    63          return true;
    64      }
    65
    66      public TreeNode getChildAt(int childIndex) {
    67          return (TreeNode) getChildList().get(childIndex);
    68      }
    69
    70      public int getChildCount() {
    71          return getChildList().size();
    72      }
    73
    74      public int getIndex(TreeNode node) {
    75          return getChildList().indexOf(node);
    76      }
    77
    78      public boolean isLeaf() {
    79          return getXmlBranch().nodeCount() <= 0;
    80      }
    81
    82      public String toString() {
    83          return xmlNode.getName();
    84      }
    85
    86      // Implementation methods
    87      // -------------------------------------------------------------------------
    88
    89      /***
    90       * Uses Lazy Initialization pattern to create a List of children
    91       *
    92       * @return DOCUMENT ME!
    93       */
    94      protected List getChildList() {
    95          // for now lets just create the children once, the first time they
    96          // are asked for.
    97          // XXXX - we may wish to detect inconsistencies here....
    98          if (children == null) {
    99              children = createChildList();
    100         }
    101
    102         return children;
    103     }
    104
    105     /***
    106      * Factory method to create List of children TreeNodes
    107      *
    108      * @return DOCUMENT ME!
    109      */
    110     protected List createChildList() {
    111         // add attributes and content as children?
    112         Branch branch = getXmlBranch();
    113         int size = branch.nodeCount();
    114         List childList = new ArrayList(size);
    115
    116         for (int i = 0; i < size; i++) {
    117             Node node = branch.node(i);
    118
    119             // ignore whitespace text nodes
    120             if (node instanceof CharacterData) {
    121                 String text = node.getText();
    122
    123                 if (text == null) {
    124                     continue;
    125                 }
    126
    127                 text = text.trim();
    128
    129                 if (text.length() <= 0) {
    130                     continue;
    131                 }
    132             }
    133
    134             childList.add(createChildTreeNode(node));
    135         }
    136
    137         return childList;
    138     }
    139
    140     /***
    141      * Factory method to create child tree nodes for a given XML node type
    142      *
    143      * @param xmlNode
    144      *            DOCUMENT ME!
    145      *
    146      * @return DOCUMENT ME!
    147      */
    148     protected TreeNode createChildTreeNode(Node xmlNode) {
    149         if (xmlNode instanceof Branch) {
    150             return new BranchTreeNode(this, (Branch) xmlNode);
    151         } else {
    152             return new LeafTreeNode(this, xmlNode);
    153         }
    154     }
    155
    156     protected Branch getXmlBranch() {
    157         return (Branch) xmlNode;
    158     }
    159 }
    160
    161 /*
    162  * Redistribution and use of this software and associated documentation
    163  * ("Software"), with or without modification, are permitted provided that the
    164  * following conditions are met:
    165  *
    166  * 1. Redistributions of source code must retain copyright statements and
    167  * notices. Redistributions must also contain a copy of this document.
    168  *
    169  * 2. Redistributions in binary form must reproduce the above copyright notice,
    170  * this list of conditions and the following disclaimer in the documentation
    171  * and/or other materials provided with the distribution.
    172  *
    173  * 3. The name "DOM4J" must not be used to endorse or promote products derived
    174  * from this Software without prior written permission of MetaStuff, Ltd. For
    175  * written permission, please contact dom4j-info@metastuff.com.
    176  *
    177  * 4. Products derived from this Software may not be called "DOM4J" nor may
    178  * "DOM4J" appear in their names without prior written permission of MetaStuff,
    179  * Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
    180  *
    181  * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
    182  *
    183  * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
    184  * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    185  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    186  * ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
    187  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    188  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    189  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    190  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    191  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    192  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    193  * POSSIBILITY OF SUCH DAMAGE.
    194  *
    195  * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
    196  */