XmlHelper xref

    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one
    3    * or more contributor license agreements.  See the NOTICE file
    4    * distributed with this work for additional information
    5    * regarding copyright ownership.  The ASF licenses this file
    6    * to you under the Apache License, Version 2.0 (the
    7    * "License"); you may not use this file except in compliance
    8    * with the License.  You may obtain a copy of the License at
    9    *
    10   *   http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   * Unless required by applicable law or agreed to in writing,
    13   * software distributed under the License is distributed on an
    14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   * KIND, either express or implied.  See the License for the
    16   * specific language governing permissions and limitations
    17   * under the License.
    18   */
    19  package org.apache.felix.obrplugin;
    20
    21
    22  import org.w3c.dom.Node;
    23  import org.w3c.dom.NodeList;
    24
    25
    26  /**
    27   * Provide XML helper methods to support pre-Java5 runtimes
    28   *
    29   * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
    30   */
    31  public class XmlHelper
    32  {
    33      /**
    34       * based on public Java5 javadoc of org.w3c.dom.Node.getTextContent method
    35       */
    36      public static String getTextContent( Node node )
    37      {
    38          switch ( node.getNodeType() )
    39          {
    40              case Node.ELEMENT_NODE:
    41              case Node.ATTRIBUTE_NODE:
    42              case Node.ENTITY_NODE:
    43              case Node.ENTITY_REFERENCE_NODE:
    44              case Node.DOCUMENT_FRAGMENT_NODE:
    45                  return mergeTextContent( node.getChildNodes() );
    46              case Node.TEXT_NODE:
    47              case Node.CDATA_SECTION_NODE:
    48              case Node.COMMENT_NODE:
    49              case Node.PROCESSING_INSTRUCTION_NODE:
    50                  return node.getNodeValue();
    51              case Node.DOCUMENT_NODE:
    52              case Node.DOCUMENT_TYPE_NODE:
    53              case Node.NOTATION_NODE:
    54              default:
    55                  return null;
    56          }
    57      }
    58
    59
    60      /**
    61       * based on the following quote from public Java5 javadoc of org.w3c.dom.Node.getTextContent method:
    62       *
    63       * "concatenation of the textContent attribute value of every child node, excluding COMMENT_NODE and
    64       * PROCESSING_INSTRUCTION_NODE nodes. This is the empty string if the node has no children"
    65       */
    66      private static String mergeTextContent( NodeList nodes )
    67      {
    68          StringBuffer buf = new StringBuffer();
    69          for ( int i = 0; i < nodes.getLength(); i++ )
    70          {
    71              Node n = nodes.item( i );
    72              final String text;
    73
    74              switch ( n.getNodeType() )
    75              {
    76                  case Node.COMMENT_NODE:
    77                  case Node.PROCESSING_INSTRUCTION_NODE:
    78                      text = null;
    79                      break;
    80                  default:
    81                      text = getTextContent( n );
    82                      break;
    83              }
    84
    85              if ( text != null )
    86              {
    87                  buf.append( text );
    88              }
    89          }
    90          return buf.toString();
    91      }
    92
    93
    94      /**
    95       * based on public Java5 javadoc of org.w3c.dom.Node.setTextContent method
    96       */
    97      public static void setTextContent( Node node, final String text )
    98      {
    99          while ( node.hasChildNodes() )
    100         {
    101             node.removeChild( node.getFirstChild() );
    102         }
    103
    104         if ( text != null && text.length() > 0 )
    105         {
    106             Node textNode = node.getOwnerDocument().createTextNode( text );
    107             node.appendChild( textNode );
    108         }
    109     }
    110 }