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    1   /*
    2    * Copyright 1999-2004 The Apache Software Foundation
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *     http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  package org.apache.commons.jxpath.ri.model.dom;
    17
    18  import org.apache.commons.jxpath.ri.Compiler;
    19  import org.apache.commons.jxpath.ri.QName;
    20  import org.apache.commons.jxpath.ri.compiler.NodeTest;
    21  import org.apache.commons.jxpath.ri.compiler.NodeTypeTest;
    22  import org.apache.commons.jxpath.ri.model.NodePointer;
    23
    24  /***
    25   * Represents a namespace node.
    26   *
    27   * @author Dmitri Plotnikov
    28   * @version $Revision: 1.13 $ $Date: 2004/04/01 02:55:32 $
    29   */
    30  public class NamespacePointer extends NodePointer {
    31      private String prefix;
    32      private String namespaceURI;
    33
    34      public NamespacePointer(NodePointer parent, String prefix) {
    35          super(parent);
    36          this.prefix = prefix;
    37      }
    38
    39      public NamespacePointer(
    40          NodePointer parent,
    41          String prefix,
    42          String namespaceURI)
    43      {
    44          super(parent);
    45          this.prefix = prefix;
    46          this.namespaceURI = namespaceURI;
    47      }
    48
    49      public QName getName() {
    50          return new QName(prefix);
    51      }
    52
    53      public Object getBaseValue() {
    54          return null;
    55      }
    56
    57      public boolean isCollection() {
    58          return false;
    59      }
    60
    61      public int getLength() {
    62          return 1;
    63      }
    64
    65      public Object getImmediateNode() {
    66          return getNamespaceURI();
    67      }
    68
    69      public String getNamespaceURI() {
    70          if (namespaceURI == null) {
    71              namespaceURI = parent.getNamespaceURI(prefix);
    72          }
    73          return namespaceURI;
    74      }
    75
    76      public boolean isLeaf() {
    77          return true;
    78      }
    79
    80      /***
    81       * Throws UnsupportedOperationException.
    82       */
    83      public void setValue(Object value) {
    84          throw new UnsupportedOperationException("Cannot modify DOM trees");
    85      }
    86
    87      public boolean testNode(NodeTest nodeTest) {
    88          return nodeTest == null
    89              || ((nodeTest instanceof NodeTypeTest)
    90                  && ((NodeTypeTest) nodeTest).getNodeType()
    91                      == Compiler.NODE_TYPE_NODE);
    92      }
    93
    94      public String asPath() {
    95          StringBuffer buffer = new StringBuffer();
    96          if (parent != null) {
    97              buffer.append(parent.asPath());
    98              if (buffer.length() == 0
    99                  || buffer.charAt(buffer.length() - 1) != '/') {
    100                 buffer.append('/');
    101             }
    102         }
    103         buffer.append("namespace::");
    104         buffer.append(prefix);
    105         return buffer.toString();
    106     }
    107
    108     public int hashCode() {
    109         return prefix.hashCode();
    110     }
    111
    112     public boolean equals(Object object) {
    113         if (object == this) {
    114             return true;
    115         }
    116
    117         if (!(object instanceof NamespacePointer)) {
    118             return false;
    119         }
    120
    121         NamespacePointer other = (NamespacePointer) object;
    122         return prefix.equals(other.prefix);
    123     }
    124
    125     public int compareChildNodePointers(
    126         NodePointer pointer1,
    127         NodePointer pointer2)
    128     {
    129         // Won't happen - namespaces don't have children
    130         return 0;
    131     }
    132  }