| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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: ElemExsltFunction.java 468643 2006-10-28 06:56:03Z minchau $ |
| */ |
| package org.apache.xalan.templates; |
| |
| import javax.xml.transform.TransformerException; |
| |
| import org.apache.xalan.extensions.ExtensionNamespaceSupport; |
| import org.apache.xalan.transformer.TransformerImpl; |
| import org.apache.xpath.VariableStack; |
| import org.apache.xpath.XPathContext; |
| import org.apache.xpath.objects.XObject; |
| |
| import org.w3c.dom.Node; |
| import org.w3c.dom.NodeList; |
| |
| |
| /** |
| * Implement func:function. |
| * @xsl.usage advanced |
| */ |
| public class ElemExsltFunction extends ElemTemplate |
| { |
| static final long serialVersionUID = 272154954793534771L; |
| /** |
| * Get an integer representation of the element type. |
| * |
| * @return An integer representation of the element, defined in the |
| * Constants class. |
| * @see org.apache.xalan.templates.Constants |
| */ |
| public int getXSLToken() |
| { |
| return Constants.EXSLT_ELEMNAME_FUNCTION; |
| } |
| |
| /** |
| * Return the node name, defined in the |
| * Constants class. |
| * @see org.apache.xalan.templates.Constants |
| * @return The node name |
| * |
| */ |
| public String getNodeName() |
| { |
| return Constants.EXSLT_ELEMNAME_FUNCTION_STRING; |
| } |
| |
| public void execute(TransformerImpl transformer, XObject[] args) |
| throws TransformerException |
| { |
| XPathContext xctxt = transformer.getXPathContext(); |
| VariableStack vars = xctxt.getVarStack(); |
| |
| // Increment the frame bottom of the variable stack by the |
| // frame size |
| int thisFrame = vars.getStackFrame(); |
| int nextFrame = vars.link(m_frameSize); |
| |
| if (m_inArgsSize < args.length) { |
| throw new TransformerException ("function called with too many args"); |
| } |
| |
| // Set parameters, |
| // have to clear the section of the stack frame that has params. |
| if (m_inArgsSize > 0) { |
| vars.clearLocalSlots(0, m_inArgsSize); |
| |
| if (args.length > 0) { |
| vars.setStackFrame(thisFrame); |
| NodeList children = this.getChildNodes(); |
| |
| for (int i = 0; i < args.length; i ++) { |
| Node child = children.item(i); |
| if (children.item(i) instanceof ElemParam) { |
| ElemParam param = (ElemParam)children.item(i); |
| vars.setLocalVariable(param.getIndex(), args[i], nextFrame); |
| } |
| } |
| |
| vars.setStackFrame(nextFrame); |
| } |
| } |
| |
| // Removed ElemTemplate 'push' and 'pop' of RTFContext, in order to avoid losing the RTF context |
| // before a value can be returned. ElemExsltFunction operates in the scope of the template that called |
| // the function. |
| // xctxt.pushRTFContext(); |
| |
| vars.setStackFrame(nextFrame); |
| transformer.executeChildTemplates(this, true); |
| |
| // Reset the stack frame after the function call |
| vars.unlink(thisFrame); |
| |
| // Following ElemTemplate 'pop' removed -- see above. |
| // xctxt.popRTFContext(); |
| |
| } |
| |
| /** |
| * Called after everything else has been |
| * recomposed, and allows the function to set remaining |
| * values that may be based on some other property that |
| * depends on recomposition. |
| */ |
| public void compose(StylesheetRoot sroot) throws TransformerException |
| { |
| super.compose(sroot); |
| |
| // Register the function namespace (if not already registered). |
| String namespace = getName().getNamespace(); |
| String handlerClass = sroot.getExtensionHandlerClass(); |
| Object[] args ={namespace, sroot}; |
| ExtensionNamespaceSupport extNsSpt = |
| new ExtensionNamespaceSupport(namespace, handlerClass, args); |
| sroot.getExtensionNamespacesManager().registerExtension(extNsSpt); |
| // Make sure there is a handler for the EXSLT functions namespace |
| // -- for isElementAvailable(). |
| if (!(namespace.equals(Constants.S_EXSLT_FUNCTIONS_URL))) |
| { |
| namespace = Constants.S_EXSLT_FUNCTIONS_URL; |
| args = new Object[]{namespace, sroot}; |
| extNsSpt = new ExtensionNamespaceSupport(namespace, handlerClass, args); |
| sroot.getExtensionNamespacesManager().registerExtension(extNsSpt); |
| } |
| } |
| } |