- /*
- * The Apache Software License, Version 1.1
- *
- *
- * Copyright (c) 1999 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xalan" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation and was
- * originally based on software copyright (c) 1999, Lotus
- * Development Corporation., http://www.lotus.com. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- package org.apache.xalan.extensions;
-
- import java.util.Vector;
- import java.lang.reflect.Method;
- import java.lang.reflect.Modifier;
- import java.lang.reflect.Constructor;
- import java.lang.reflect.InvocationTargetException;
- import java.io.IOException;
-
- import org.w3c.dom.NodeList;
- import org.w3c.dom.Node;
-
- import org.apache.xalan.transformer.TransformerImpl;
-
- import org.apache.xalan.templates.ElemTemplateElement;
- import org.apache.xalan.templates.Stylesheet;
- import org.apache.xalan.templates.StylesheetRoot;
- import org.apache.xalan.templates.ElemTemplate;
- import org.apache.xalan.templates.ElemExsltFunction;
- import org.apache.xalan.templates.ElemExsltFuncResult;
- import org.apache.xalan.templates.Constants;
-
- import org.apache.xml.utils.QName;
-
- import org.apache.xpath.XPathContext;
- import org.apache.xpath.VariableStack;
- import org.apache.xpath.objects.XObject;
- import org.apache.xpath.objects.XString;
- import javax.xml.transform.TransformerException;
-
- /**
- * Execute EXSLT functions, determine the availability of EXSLT functions, and the
- * availability of an EXSLT result element.
- */
- public class ExtensionHandlerExsltFunction extends ExtensionHandler
- {
- private String m_namespace;
- private StylesheetRoot m_stylesheet;
- private static final QName RESULTQNAME =
- new QName(Constants.S_EXSLT_FUNCTIONS_URL,
- Constants.EXSLT_ELEMNAME_FUNCRESULT_STRING);
- /**
- * Constructor called from ElemExsltFunction runtimeInit().
- */
- public ExtensionHandlerExsltFunction(String ns, StylesheetRoot stylesheet)
- {
- super(ns, "xml"); // required by ExtensionHandler interface.
- m_namespace = ns;
- m_stylesheet = stylesheet;
- }
-
- /**
- * Required by ExtensionHandler (an abstract method). No-op.
- */
- public void processElement(
- String localPart, ElemTemplateElement element, TransformerImpl transformer,
- Stylesheet stylesheetTree, Object methodKey) throws TransformerException, IOException
- {}
-
- /**
- * Get the ElemExsltFunction element associated with the
- * function.
- *
- * @param funcName Local name of the function.
- * @return the ElemExsltFunction element associated with
- * the function, null if none exists.
- */
- public ElemExsltFunction getFunction(String funcName)
- {
- QName qname = new QName(m_namespace, funcName);
- ElemTemplate templ = m_stylesheet.getTemplateComposed(qname);
- if (templ != null && templ instanceof ElemExsltFunction)
- return (ElemExsltFunction) templ;
- else
- return null;
- }
-
-
- /**
- * Does the EXSLT function exist?
- *
- * @param funcName Local name of the function.
- * @return true if the function exists.
- */
- public boolean isFunctionAvailable(String funcName)
- {
- return getFunction(funcName)!= null;
- }
-
- /** If an element-available() call applies to an EXSLT result element within
- * an EXSLT function element, return true.
- *
- * Note: The EXSLT function element is a template-level element, and
- * element-available() returns false for it.
- *
- * @param Local name of the function.
- * @return true if the function is available.
- */
- public boolean isElementAvailable(String elemName)
- {
- if (!(new QName(m_namespace, elemName).equals(RESULTQNAME)))
- {
- return false;
- }
- else
- {
- ElemTemplateElement elem = m_stylesheet.getFirstChildElem();
- while (elem != null && elem != m_stylesheet)
- {
- if (elem instanceof ElemExsltFuncResult && ancestorIsFunction(elem))
- return true;
- ElemTemplateElement nextElem = elem.getFirstChildElem();
- if (nextElem == null)
- nextElem = elem.getNextSiblingElem();
- if (nextElem == null)
- nextElem = elem.getParentElem();
- elem = nextElem;
- }
- }
- return false;
- }
-
- /**
- * Determine whether the func:result element is within a func:function element.
- * If not, it is illegal.
- */
- private boolean ancestorIsFunction(ElemTemplateElement child)
- {
- while (child.getParentElem() != null
- && !(child.getParentElem() instanceof StylesheetRoot))
- {
- if (child.getParentElem() instanceof ElemExsltFunction)
- return true;
- child = child.getParentElem();
- }
- return false;
- }
-
- /**
- * Execute the EXSLT function and return the result value.
- *
- * @param funcName Name of the EXSLT function.
- * @param args The arguments of the function call.
- * @param methodKey Not used.
- * @param exprContext Used to get the XPathContext.
- * @return the return value of the function evaluation.
- * @throws TransformerException
- */
- public Object callFunction(
- String funcName, Vector args, Object methodKey,
- ExpressionContext exprContext) throws TransformerException
- {
- XObject[] methodArgs;
- methodArgs = new XObject[args.size()];
- try
- {
- for (int i = 0; i < methodArgs.length; i++)
- {
- methodArgs[i] = XObject.create(args.elementAt(i));
- }
- ElemExsltFunction elemFunc = getFunction(funcName);
- XPathContext context = exprContext.getXPathContext();
- TransformerImpl transformer = (TransformerImpl)context.getOwnerObject();
- elemFunc.execute(transformer, methodArgs);
-
- VariableStack varStack = context.getVarStack();
- XObject val = new XString(""); // value returned if no result element.
-
- int resultIndex = elemFunc.getResultIndex();
- if (varStack.isLocalSet(resultIndex))
- val = varStack.getLocalVariable(context, resultIndex);
- return val;
- }
- catch (Exception e)
- {
- // e.printStackTrace();
- throw new TransformerException(e);
- }
- }
-
- }