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Java example source code file (ExsltCommon.java)

This example Java source code file (ExsltCommon.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

boolean, dtmiterator, dtmnodeiterator, exsltcommon, nodeset, number, object, rtf, string

The ExsltCommon.java Java example source code

/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * Copyright 1999-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: ExsltCommon.java,v 1.2.4.1 2005/09/15 02:45:24 jeffsuttor Exp $
 */
package com.sun.org.apache.xalan.internal.lib;

import com.sun.org.apache.xalan.internal.extensions.ExpressionContext;
import com.sun.org.apache.xml.internal.dtm.DTMIterator;
import com.sun.org.apache.xml.internal.dtm.ref.DTMNodeIterator;
import com.sun.org.apache.xpath.internal.NodeSet;

/**
 * This class contains EXSLT common extension functions.
 * It is accessed by specifying a namespace URI as follows:
 * <pre>
 *    xmlns:exslt="http://exslt.org/common"
 * </pre>
 *
 * The documentation for each function has been copied from the relevant
 * EXSLT Implementer page.
 *
 * @see <a href="http://www.exslt.org/">EXSLT
 * @xsl.usage general
 */
public class ExsltCommon
{
  /**
   * The exsl:object-type function returns a string giving the type of the object passed
   * as the argument. The possible object types are: 'string', 'number', 'boolean',
   * 'node-set', 'RTF', or 'external'.
   *
   * Most XSLT object types can be coerced to each other without error. However, there are
   * certain coercions that raise errors, most importantly treating anything other than a
   * node set as a node set. Authors of utilities such as named templates or user-defined
   * extension functions may wish to give some flexibility in the parameter and argument values
   * that are accepted by the utility; the exsl:object-type function enables them to do so.
   *
   * The Xalan extensions MethodResolver converts 'object-type' to 'objectType'.
   *
   * @param obj The object to be typed.
   * @return objectType 'string', 'number', 'boolean', 'node-set', 'RTF', or 'external'.
   *
   * @see <a href="http://www.exslt.org/">EXSLT
   */
  public static String objectType (Object obj)
  {
    if (obj instanceof String)
      return "string";
    else if (obj instanceof Boolean)
      return "boolean";
    else if (obj instanceof Number)
      return "number";
    else if (obj instanceof DTMNodeIterator)
    {
      DTMIterator dtmI = ((DTMNodeIterator)obj).getDTMIterator();
      if (dtmI instanceof com.sun.org.apache.xpath.internal.axes.RTFIterator)
        return "RTF";
      else
        return "node-set";
    }
    else
      return "unknown";
  }

  /**
   * The exsl:node-set function converts a result tree fragment (which is what you get
   * when you use the content of xsl:variable rather than its select attribute to give
   * a variable value) into a node set. This enables you to process the XML that you create
   * within a variable, and therefore do multi-step processing.
   *
   * You can also use this function to turn a string into a text node, which is helpful
   * if you want to pass a string to a function that only accepts a node set.
   *
   * The Xalan extensions MethodResolver converts 'node-set' to 'nodeSet'.
   *
   * @param myProcessor is passed in by the Xalan extension processor
   * @param rtf The result tree fragment to be converted to a node-set.
   *
   * @return node-set with the contents of the result tree fragment.
   *
   * Note: Already implemented in the xalan namespace as nodeset.
   *
   * @see <a href="http://www.exslt.org/">EXSLT
   */
  public static NodeSet nodeSet(ExpressionContext myProcessor, Object rtf)
  {
    return Extensions.nodeset(myProcessor, rtf);
  }

}

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