| /* |
| * 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.operations; |
| |
| import javax.xml.transform.TransformerException; |
| |
| import org.apache.xml.utils.QName; |
| import org.apache.xpath.Expression; |
| import org.apache.xpath.XPath; |
| import org.apache.xpath.XPathContext; |
| import org.apache.xpath.objects.XObject; |
| import org.apache.xpath.objects.XNodeSet; |
| |
| import org.w3c.dom.Node; |
| |
| import org.apache.xpath.res.XPATHErrorResources; |
| import org.apache.xalan.res.XSLMessages; |
| |
| /** |
| * The variable reference expression executer. |
| */ |
| public class Variable extends Expression |
| { |
| /** Tell if fixupVariables was called. |
| * @serial */ |
| private boolean m_fixUpWasCalled = false; |
| |
| /** The qualified name of the variable. |
| * @serial */ |
| protected QName m_qname; |
| |
| /** |
| * The index of the variable, which is either an absolute index to a |
| * global, or, if higher than the globals area, must be adjusted by adding |
| * the offset to the current stack frame. |
| */ |
| protected int m_index; |
| |
| protected boolean m_isGlobal = false; |
| |
| /** |
| * 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_fixUpWasCalled = true; |
| int sz = vars.size(); |
| for (int i = vars.size()-1; i >= 0; i--) |
| { |
| QName qn = (QName)vars.elementAt(i); |
| // System.out.println("qn: "+qn); |
| if(qn.equals(m_qname)) |
| { |
| |
| if(i < globalsSize) |
| { |
| m_isGlobal = true; |
| m_index = i; |
| } |
| else |
| { |
| m_index = i-globalsSize; |
| } |
| |
| return; |
| } |
| } |
| java.lang.String msg = XSLMessages.createXPATHMessage(XPATHErrorResources.ER_COULD_NOT_FIND_VAR, |
| new Object[]{m_qname.toString()}); |
| |
| TransformerException te = new TransformerException(msg, m_slocator); |
| |
| throw new org.apache.xml.utils.WrappedRuntimeException(te); |
| |
| } |
| |
| |
| /** |
| * Set the qualified name of the variable. |
| * |
| * @param qname Must be a non-null reference to a qualified name. |
| */ |
| public void setQName(QName qname) |
| { |
| m_qname = qname; |
| } |
| |
| /** |
| * Dereference the variable, and return the reference value. Note that lazy |
| * evaluation will occur. If a variable within scope is not found, a warning |
| * will be sent to the error listener, and an empty nodeset will be returned. |
| * |
| * |
| * @param xctxt The runtime execution context. |
| * |
| * @return The evaluated variable, or an empty nodeset if not found. |
| * |
| * @throws javax.xml.transform.TransformerException |
| */ |
| public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException |
| { |
| |
| // Is the variable fetched always the same? |
| // XObject result = xctxt.getVariable(m_qname); |
| if(m_fixUpWasCalled) |
| { |
| XObject result; |
| if(m_isGlobal) |
| result = xctxt.getVarStack().getGlobalVariable(xctxt, m_index); |
| else |
| result = xctxt.getVarStack().getLocalVariable(xctxt, m_index); |
| |
| if (null == result) |
| { |
| // This should now never happen... |
| warn(xctxt, XPATHErrorResources.WG_ILLEGAL_VARIABLE_REFERENCE, |
| new Object[]{ m_qname.getLocalPart() }); //"VariableReference given for variable out "+ |
| // (new RuntimeException()).printStackTrace(); |
| // error(xctxt, XPATHErrorResources.ER_COULDNOT_GET_VAR_NAMED, |
| // new Object[]{ m_qname.getLocalPart() }); //"Could not get variable named "+varName); |
| |
| result = new XNodeSet(xctxt.getDTMManager()); |
| } |
| |
| return result; |
| } |
| else |
| { |
| // Hack city... big time. This is needed to evaluate xpaths from extensions, |
| // pending some bright light going off in my head. Some sort of callback? |
| synchronized(this) |
| { |
| org.apache.xml.utils.PrefixResolver prefixResolver = xctxt.getNamespaceContext(); |
| |
| // Get the current ElemTemplateElement, which must be pushed in as the |
| // prefix resolver, and then walk backwards in document order, searching |
| // for an xsl:param element or xsl:variable element that matches our |
| // qname. If we reach the top level, use the StylesheetRoot's composed |
| // list of top level variables and parameters. |
| |
| if (prefixResolver instanceof org.apache.xalan.templates.ElemTemplateElement) |
| { |
| |
| org.apache.xalan.templates.ElemVariable vvar; |
| |
| org.apache.xalan.templates.ElemTemplateElement prev = |
| (org.apache.xalan.templates.ElemTemplateElement) prefixResolver; |
| |
| if (!(prev instanceof org.apache.xalan.templates.Stylesheet)) |
| { |
| while ( !(prev.getParentNode() instanceof org.apache.xalan.templates.Stylesheet) ) |
| { |
| org.apache.xalan.templates.ElemTemplateElement savedprev = prev; |
| |
| while (null != (prev = prev.getPreviousSiblingElem())) |
| { |
| if(prev instanceof org.apache.xalan.templates.ElemVariable) |
| { |
| vvar = (org.apache.xalan.templates.ElemVariable) prev; |
| |
| if (vvar.getName().equals(m_qname)) |
| { |
| m_index = vvar.getIndex(); |
| m_isGlobal = false; |
| m_fixUpWasCalled = true; |
| return execute(xctxt); |
| } |
| } |
| } |
| prev = savedprev.getParentElem(); |
| } |
| } |
| |
| vvar = prev.getStylesheetRoot().getVariableOrParamComposed(m_qname); |
| if (null != vvar) |
| { |
| m_index = vvar.getIndex(); |
| m_isGlobal = true; |
| m_fixUpWasCalled = true; |
| return execute(xctxt); |
| } |
| |
| } |
| } |
| throw new javax.xml.transform.TransformerException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_VAR_NOT_RESOLVABLE, new Object[]{m_qname.toString()})); //"Variable not resolvable: "+m_qname); |
| } |
| } |
| |
| /** |
| * Tell if this expression returns a stable number that will not change during |
| * iterations within the expression. This is used to determine if a proximity |
| * position predicate can indicate that no more searching has to occur. |
| * |
| * |
| * @return true if the expression represents a stable number. |
| */ |
| public boolean isStableNumber() |
| { |
| return true; |
| } |
| |
| } |