1. /*
  2. * The Apache Software License, Version 1.1
  3. *
  4. *
  5. * Copyright (c) 1999 The Apache Software Foundation. All rights
  6. * reserved.
  7. *
  8. * Redistribution and use in source and binary forms, with or without
  9. * modification, are permitted provided that the following conditions
  10. * are met:
  11. *
  12. * 1. Redistributions of source code must retain the above copyright
  13. * notice, this list of conditions and the following disclaimer.
  14. *
  15. * 2. Redistributions in binary form must reproduce the above copyright
  16. * notice, this list of conditions and the following disclaimer in
  17. * the documentation and/or other materials provided with the
  18. * distribution.
  19. *
  20. * 3. The end-user documentation included with the redistribution,
  21. * if any, must include the following acknowledgment:
  22. * "This product includes software developed by the
  23. * Apache Software Foundation (http://www.apache.org/)."
  24. * Alternately, this acknowledgment may appear in the software itself,
  25. * if and wherever such third-party acknowledgments normally appear.
  26. *
  27. * 4. The names "Xalan" and "Apache Software Foundation" must
  28. * not be used to endorse or promote products derived from this
  29. * software without prior written permission. For written
  30. * permission, please contact apache@apache.org.
  31. *
  32. * 5. Products derived from this software may not be called "Apache",
  33. * nor may "Apache" appear in their name, without prior written
  34. * permission of the Apache Software Foundation.
  35. *
  36. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
  37. * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  38. * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  39. * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
  40. * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  41. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  42. * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  43. * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  44. * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  45. * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  46. * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  47. * SUCH DAMAGE.
  48. * ====================================================================
  49. *
  50. * This software consists of voluntary contributions made by many
  51. * individuals on behalf of the Apache Software Foundation and was
  52. * originally based on software copyright (c) 1999, Lotus
  53. * Development Corporation., http://www.lotus.com. For more
  54. * information on the Apache Software Foundation, please see
  55. * <http://www.apache.org/>.
  56. */
  57. package org.apache.xpath.functions;
  58. import org.apache.xpath.res.XPATHErrorResources;
  59. //import org.w3c.dom.Node;
  60. //import org.w3c.dom.traversal.NodeIterator;
  61. import org.apache.xml.dtm.DTM;
  62. import org.apache.xml.dtm.DTMIterator;
  63. import java.util.Vector;
  64. import org.apache.xpath.XPathContext;
  65. import org.apache.xpath.XPath;
  66. import org.apache.xpath.objects.XObject;
  67. import org.apache.xpath.objects.XNodeSet;
  68. import org.apache.xpath.axes.PredicatedNodeTest;
  69. import org.apache.xpath.axes.LocPathIterator;
  70. import org.apache.xpath.axes.ContextNodeList;
  71. import org.apache.xpath.axes.SubContextList;
  72. /**
  73. * <meta name="usage" content="advanced"/>
  74. * Execute the current() function.
  75. */
  76. public class FuncCurrent extends Function
  77. {
  78. /**
  79. * Execute the function. The function must return
  80. * a valid object.
  81. * @param xctxt The current execution context.
  82. * @return A valid XObject.
  83. *
  84. * @throws javax.xml.transform.TransformerException
  85. */
  86. public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
  87. {
  88. // If we're in a predicate, then this will return non-null.
  89. Object subContextList = xctxt.getSubContextList();
  90. int currentNode;
  91. // %TBD% Hack city...
  92. if (null != subContextList && subContextList instanceof PredicatedNodeTest)
  93. {
  94. // PredicatedNodeTest iter = (PredicatedNodeTest) xctxt.getSubContextList();
  95. // LocPathIterator lpi = iter.getLocPathIterator();
  96. LocPathIterator lpi = xctxt.getCurrentNodeList();
  97. currentNode = lpi.getCurrentContextNode();
  98. }
  99. else if(xctxt.getIteratorRoot() != DTM.NULL)
  100. {
  101. currentNode = xctxt.getIteratorRoot();
  102. }
  103. else
  104. {
  105. DTMIterator cnl = xctxt.getContextNodeList();
  106. if (null != cnl)
  107. {
  108. // %REVIEW% Not so certain that this is doing the right thing?
  109. currentNode = cnl.getCurrentNode();
  110. }
  111. else
  112. currentNode = DTM.NULL;
  113. }
  114. // if(DTM.NULL != currentNode)
  115. // {
  116. // DTM dtm = xctxt.getDTM(currentNode);
  117. // System.err.println("current node: "+dtm.getNodeName(currentNode)+"["+Integer.toHexString(currentNode)+"]");
  118. // }
  119. // else
  120. // {
  121. // System.err.println("current node: DTM.NULL");
  122. // }
  123. return new XNodeSet(currentNode, xctxt.getDTMManager());
  124. }
  125. /**
  126. * No arguments to process, so this does nothing.
  127. */
  128. public void fixupVariables(java.util.Vector vars, int globalsSize)
  129. {
  130. // no-op
  131. }
  132. }