| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 1999-2003 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 org.apache.xalan.templates.StylesheetRoot; |
| import org.apache.xpath.ExpressionOwner; |
| import org.apache.xpath.XPathVisitor; |
| import org.apache.xpath.functions.FuncExtFunction; |
| import org.apache.xpath.functions.FuncExtFunctionAvailable; |
| import org.apache.xpath.functions.Function; |
| |
| /** |
| * When {@link org.apache.xalan.processor.StylesheetHandler} creates |
| * an {@link org.apache.xpath.XPath}, the ExpressionVisitor |
| * visits the XPath expression. For any extension functions it |
| * encounters, it instructs StylesheetRoot to register the |
| * extension namespace. |
| * |
| * This mechanism is required to locate extension functions |
| * that may be embedded within an expression. |
| */ |
| public class ExpressionVisitor extends XPathVisitor |
| { |
| private StylesheetRoot m_sroot; |
| |
| /** |
| * The constructor sets the StylesheetRoot variable which |
| * is used to register extension namespaces. |
| * @param sroot the StylesheetRoot that is being constructed. |
| */ |
| public ExpressionVisitor (StylesheetRoot sroot) |
| { |
| m_sroot = sroot; |
| } |
| |
| /** |
| * If the function is an extension function, register the namespace. |
| * |
| * @param owner The current XPath object that owns the expression. |
| * @param function The function currently being visited. |
| * |
| * @return true to continue the visit in the subtree, if any. |
| */ |
| public boolean visitFunction(ExpressionOwner owner, Function func) |
| { |
| if (func instanceof FuncExtFunction) |
| { |
| String namespace = ((FuncExtFunction)func).getNamespace(); |
| m_sroot.getExtensionNamespacesManager().registerExtension(namespace); |
| } |
| else if (func instanceof FuncExtFunctionAvailable) |
| { |
| String arg = ((FuncExtFunctionAvailable)func).getArg0().toString(); |
| if (arg.indexOf(":") > 0) |
| { |
| String prefix = arg.substring(0,arg.indexOf(":")); |
| String namespace = this.m_sroot.getNamespaceForPrefix(prefix); |
| m_sroot.getExtensionNamespacesManager().registerExtension(namespace); |
| } |
| } |
| return true; |
| } |
| |
| } |