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.axes;
  58. import javax.xml.transform.TransformerException;
  59. import org.apache.xpath.XPathContext;
  60. import org.apache.xpath.compiler.Compiler;
  61. import org.apache.xpath.patterns.NodeTest;
  62. import org.apache.xpath.objects.XObject;
  63. import org.apache.xml.dtm.DTM;
  64. import org.apache.xml.dtm.DTMIterator;
  65. import org.apache.xml.dtm.DTMFilter;
  66. /**
  67. * <meta name="usage" content="advanced"/>
  68. * This class implements an optimized iterator for
  69. * attribute axes patterns.
  70. * @see org.apache.xpath.axes.WalkerFactory#newLocPathIterator
  71. */
  72. public class AttributeIterator extends ChildTestIterator
  73. {
  74. /**
  75. * Create a AttributeIterator object.
  76. *
  77. * @param compiler A reference to the Compiler that contains the op map.
  78. * @param opPos The position within the op map, which contains the
  79. * location path expression for this itterator.
  80. *
  81. * @throws javax.xml.transform.TransformerException
  82. */
  83. AttributeIterator(Compiler compiler, int opPos, int analysis)
  84. throws javax.xml.transform.TransformerException
  85. {
  86. super(compiler, opPos, analysis);
  87. }
  88. /**
  89. * Get the next node via getFirstAttribute && getNextAttribute.
  90. */
  91. protected int getNextNode()
  92. {
  93. m_lastFetched = (DTM.NULL == m_lastFetched)
  94. ? m_cdtm.getFirstAttribute(m_context)
  95. : m_cdtm.getNextAttribute(m_lastFetched);
  96. return m_lastFetched;
  97. }
  98. /**
  99. * Returns the axis being iterated, if it is known.
  100. *
  101. * @return Axis.CHILD, etc., or -1 if the axis is not known or is of multiple
  102. * types.
  103. */
  104. public int getAxis()
  105. {
  106. return org.apache.xml.dtm.Axis.ATTRIBUTE;
  107. }
  108. }