- /*
- * 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 1.10 2004/02/11 17:56:36 minchau 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</a>
- * @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</a>
- */
- 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 myProcesser 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</a>
- */
- public static NodeSet nodeSet(ExpressionContext myProcessor, Object rtf)
- {
- return Extensions.nodeset(myProcessor, rtf);
- }
-
- }