| /* |
| * 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: AVTPartXPath.java 468643 2006-10-28 06:56:03Z minchau $ |
| */ |
| package org.apache.xalan.templates; |
| |
| import org.apache.xml.utils.FastStringBuffer; |
| import org.apache.xpath.XPath; |
| import org.apache.xpath.XPathContext; |
| import org.apache.xpath.XPathFactory; |
| import org.apache.xpath.compiler.XPathParser; |
| import org.apache.xpath.objects.XObject; |
| |
| /** |
| * Simple string part of a complex AVT. |
| * @xsl.usage internal |
| */ |
| public class AVTPartXPath extends AVTPart |
| { |
| static final long serialVersionUID = -4460373807550527675L; |
| |
| /** |
| * The XPath object contained in this part. |
| * @serial |
| */ |
| private XPath m_xpath; |
| |
| /** |
| * This function is used to fixup variables from QNames to stack frame |
| * indexes at stylesheet build time. |
| * @param vars List of QNames that correspond to variables. This list |
| * should be searched backwards for the first qualified name that |
| * corresponds to the variable reference qname. The position of the |
| * QName in the vector from the start of the vector will be its position |
| * in the stack frame (but variables above the globalsTop value will need |
| * to be offset to the current stack frame). |
| */ |
| public void fixupVariables(java.util.Vector vars, int globalsSize) |
| { |
| m_xpath.fixupVariables(vars, globalsSize); |
| } |
| |
| /** |
| * Tell if this expression or it's subexpressions can traverse outside |
| * the current subtree. |
| * |
| * @return true if traversal outside the context node's subtree can occur. |
| */ |
| public boolean canTraverseOutsideSubtree() |
| { |
| return m_xpath.getExpression().canTraverseOutsideSubtree(); |
| } |
| |
| /** |
| * Construct a simple AVT part. |
| * |
| * @param xpath Xpath section of AVT |
| */ |
| public AVTPartXPath(XPath xpath) |
| { |
| m_xpath = xpath; |
| } |
| |
| /** |
| * Construct a simple AVT part. |
| * |
| * @param val A pure string section of an AVT. |
| * @param nsNode An object which can be used to determine the |
| * Namespace Name (URI) for any Namespace prefix used in the XPath. |
| * Usually this is based on the context where the XPath was specified, |
| * such as a node within a Stylesheet. |
| * @param xpathProcessor XPath parser |
| * @param factory XPath factory |
| * @param liaison An XPathContext object, providing infomation specific |
| * to this invocation and this thread. Maintains SAX output state, |
| * variables, error handler and so on, so the transformation/XPath |
| * object itself can be simultaneously invoked from multiple threads. |
| * |
| * @throws javax.xml.transform.TransformerException |
| * TODO: Fix or remove this unused c'tor. |
| */ |
| public AVTPartXPath( |
| String val, org.apache.xml.utils.PrefixResolver nsNode, |
| XPathParser xpathProcessor, XPathFactory factory, |
| XPathContext liaison) |
| throws javax.xml.transform.TransformerException |
| { |
| m_xpath = new XPath(val, null, nsNode, XPath.SELECT, liaison.getErrorListener()); |
| } |
| |
| /** |
| * Get the AVT part as the original string. |
| * |
| * @return the AVT part as the original string. |
| */ |
| public String getSimpleString() |
| { |
| return "{" + m_xpath.getPatternString() + "}"; |
| } |
| |
| /** |
| * Write the value into the buffer. |
| * |
| * @param xctxt An XPathContext object, providing infomation specific |
| * to this invocation and this thread. Maintains SAX state, variables, |
| * error handler and so on, so the transformation/XPath object itself |
| * can be simultaneously invoked from multiple threads. |
| * @param buf Buffer to write into. |
| * @param context The current source tree context. |
| * @param nsNode The current namespace context (stylesheet tree context). |
| * |
| * @throws javax.xml.transform.TransformerException |
| */ |
| public void evaluate( |
| XPathContext xctxt, FastStringBuffer buf, int context, org.apache.xml.utils.PrefixResolver nsNode) |
| throws javax.xml.transform.TransformerException |
| { |
| |
| XObject xobj = m_xpath.execute(xctxt, context, nsNode); |
| |
| if (null != xobj) |
| { |
| xobj.appendToFsb(buf); |
| } |
| } |
| |
| /** |
| * @see XSLTVisitable#callVisitors(XSLTVisitor) |
| */ |
| public void callVisitors(XSLTVisitor visitor) |
| { |
| m_xpath.getExpression().callVisitors(m_xpath, visitor); |
| } |
| } |