| /* |
| * 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.xpath.functions; |
| |
| import java.util.Vector; |
| |
| import org.apache.xpath.Expression; |
| import org.apache.xpath.XPathContext; |
| import org.apache.xpath.objects.*; |
| import org.apache.xalan.extensions.ExtensionsTable; |
| |
| //import org.w3c.dom.Node; |
| import org.w3c.dom.DocumentFragment; |
| import org.w3c.dom.traversal.NodeIterator; |
| |
| /** |
| * <meta name="usage" content="advanced"/> |
| * An object of this class represents an extension call expression. When |
| * the expression executes, it calls ExtensionsTable#extFunction, and then |
| * converts the result to the appropriate XObject. |
| */ |
| public class FuncExtFunction extends Function |
| { |
| |
| /** The namespace for the extension function, which should not normally |
| * be null or empty. |
| * @serial */ |
| String m_namespace; |
| |
| /** The local name of the extension. |
| * @serial */ |
| String m_extensionName; |
| |
| /** Unique method key, which is passed to ExtensionsTable#extFunction in |
| * order to allow caching of the method. |
| * @serial */ |
| Object m_methodKey; |
| |
| /** Array of static expressions which represent the parameters to the |
| * function. |
| * @serial */ |
| Vector m_argVec = new Vector(); |
| |
| /** |
| * Create a new FuncExtFunction based on the qualified name of the extension, |
| * and a unique method key. |
| * |
| * @param namespace The namespace for the extension function, which should |
| * not normally be null or empty. |
| * @param extensionName The local name of the extension. |
| * @param methodKey Unique method key, which is passed to |
| * ExtensionsTable#extFunction in order to allow caching |
| * of the method. |
| */ |
| public FuncExtFunction(java.lang.String namespace, |
| java.lang.String extensionName, Object methodKey) |
| { |
| |
| m_namespace = namespace; |
| m_extensionName = extensionName; |
| m_methodKey = methodKey; |
| } |
| |
| /** |
| * Execute the function. The function must return |
| * a valid object. |
| * @param xctxt The current execution context. |
| * @return A valid XObject. |
| * |
| * @throws javax.xml.transform.TransformerException |
| */ |
| public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException |
| { |
| |
| XObject result; |
| Vector argVec = new Vector(); |
| int nArgs = m_argVec.size(); |
| |
| for (int i = 0; i < nArgs; i++) |
| { |
| Expression arg = (Expression) m_argVec.elementAt(i); |
| |
| argVec.addElement(arg.execute(xctxt)); |
| } |
| |
| ExtensionsTable etable = xctxt.getExtensionsTable(); |
| Object val = etable.extFunction(m_namespace, m_extensionName, argVec, |
| m_methodKey, xctxt.getExpressionContext()); |
| |
| if (null != val) |
| { |
| if (val instanceof XObject) |
| { |
| result = (XObject) val; |
| } |
| |
| // else if(val instanceof XLocator) |
| // { |
| // XLocator locator = (XLocator)val; |
| // opPos = getNextOpPos(opPos+1); |
| // result = locator.connectToNodes(this, opPos, argVec); |
| // System.out.println("nodeset len: "+result.nodeset().getLength()); |
| // } |
| else if (val instanceof String) |
| { |
| result = new XString((String) val); |
| } |
| else if (val instanceof Boolean) |
| { |
| result = ((Boolean) val).booleanValue() |
| ? XBoolean.S_TRUE : XBoolean.S_FALSE; |
| } |
| else if (val instanceof Double) |
| { |
| result = new XNumber(((Double) val).doubleValue()); |
| } |
| // %TBD% |
| // else if (val instanceof DocumentFragment) |
| // { |
| // result = new XRTreeFrag((DocumentFragment) val); |
| // } |
| // else if (val instanceof NodeIterator) |
| // { |
| // result = new XNodeSet((NodeIterator) val); |
| // } |
| else if (val instanceof org.w3c.dom.Node) |
| { |
| result = new XNodeSet(xctxt.getDTMHandleFromNode((org.w3c.dom.Node)val), |
| xctxt.getDTMManager()); |
| } |
| else |
| { |
| result = new XObject(val); |
| } |
| } |
| else |
| { |
| result = new XNull(); |
| } |
| |
| return result; |
| } |
| |
| /** |
| * Set an argument expression for a function. This method is called by the |
| * XPath compiler. |
| * |
| * @param arg non-null expression that represents the argument. |
| * @param argNum The argument number index. |
| * |
| * @throws WrongNumberArgsException If the argNum parameter is beyond what |
| * is specified for this function. |
| */ |
| public void setArg(Expression arg, int argNum) |
| throws WrongNumberArgsException |
| { |
| m_argVec.addElement(arg); |
| } |
| |
| /** |
| * Check that the number of arguments passed to this function is correct. |
| * |
| * |
| * @param argNum The number of arguments that is being passed to the function. |
| * |
| * @throws WrongNumberArgsException |
| */ |
| public void checkNumberArgs(int argNum) throws WrongNumberArgsException{} |
| } |