| /* |
| * @(#)$Id$ |
| * |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 2001 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) 2001, Sun |
| * Microsystems., http://www.sun.com. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| * @author Morten Jorgensen |
| * |
| */ |
| |
| package org.apache.xalan.xsltc.compiler; |
| |
| import java.util.Vector; |
| import java.util.Enumeration; |
| |
| import javax.xml.parsers.*; |
| |
| import org.xml.sax.*; |
| |
| import org.apache.xalan.xsltc.compiler.util.Type; |
| import org.apache.xalan.xsltc.compiler.util.ReferenceType; |
| import org.apache.bcel.generic.*; |
| import org.apache.xalan.xsltc.compiler.util.*; |
| |
| final class ForEach extends Instruction { |
| |
| private Expression _select; |
| private Type _type; |
| |
| public void display(int indent) { |
| indent(indent); |
| Util.println("ForEach"); |
| indent(indent + IndentIncrement); |
| Util.println("select " + _select.toString()); |
| displayContents(indent + IndentIncrement); |
| } |
| |
| public void parseContents(Parser parser) { |
| _select = parser.parseExpression(this, "select", null); |
| |
| parseChildren(parser); |
| |
| // make sure required attribute(s) have been set |
| if (_select.isDummy()) { |
| reportError(this, parser, ErrorMsg.REQUIRED_ATTR_ERR, "select"); |
| return; |
| } |
| } |
| |
| public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
| _type = _select.typeCheck(stable); |
| |
| if (_type instanceof ReferenceType || _type instanceof NodeType) { |
| _select = new CastExpr(_select, Type.NodeSet); |
| typeCheckContents(stable); |
| return Type.Void; |
| } |
| if (_type instanceof NodeSetType||_type instanceof ResultTreeType) { |
| typeCheckContents(stable); |
| return Type.Void; |
| } |
| throw new TypeCheckError(this); |
| } |
| |
| public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| final InstructionList il = methodGen.getInstructionList(); |
| |
| // Save current node and current iterator on the stack |
| il.append(methodGen.loadCurrentNode()); |
| il.append(methodGen.loadIterator()); |
| |
| // Collect sort objects associated with this instruction |
| final Vector sortObjects = new Vector(); |
| Enumeration children = elements(); |
| while (children.hasMoreElements()) { |
| final Object child = children.nextElement(); |
| if (child instanceof Sort) { |
| sortObjects.addElement(child); |
| } |
| } |
| |
| if ((_type != null) && (_type instanceof ResultTreeType)) { |
| // Store existing DOM on stack - must be restored when loop is done |
| il.append(methodGen.loadDOM()); |
| |
| // <xsl:sort> cannot be applied to a result tree - issue warning |
| if (sortObjects.size() > 0) { |
| ErrorMsg msg = new ErrorMsg(ErrorMsg.RESULT_TREE_SORT_ERR,this); |
| getParser().reportError(WARNING, msg); |
| } |
| |
| // Put the result tree on the stack (DOM) |
| _select.translate(classGen, methodGen); |
| // Get an iterator for the whole DOM - excluding the root node |
| _type.translateTo(classGen, methodGen, Type.NodeSet); |
| // Store the result tree as the default DOM |
| il.append(SWAP); |
| il.append(methodGen.storeDOM()); |
| } |
| else { |
| // Compile node iterator |
| if (sortObjects.size() > 0) { |
| Sort.translateSortIterator(classGen, methodGen, |
| _select, sortObjects); |
| } |
| else { |
| _select.translate(classGen, methodGen); |
| } |
| if (!(_type instanceof ReferenceType)) { |
| _select.startResetIterator(classGen, methodGen); |
| } |
| } |
| |
| |
| // Overwrite current iterator |
| il.append(methodGen.storeIterator()); |
| |
| // Give local variables (if any) default values before starting loop |
| initializeVariables(classGen, methodGen); |
| |
| final BranchHandle nextNode = il.append(new GOTO(null)); |
| final InstructionHandle loop = il.append(NOP); |
| |
| translateContents(classGen, methodGen); |
| |
| nextNode.setTarget(il.append(methodGen.loadIterator())); |
| il.append(methodGen.nextNode()); |
| il.append(DUP); |
| il.append(methodGen.storeCurrentNode()); |
| il.append(new IFNE(loop)); |
| |
| // Restore current DOM (if result tree was used instead for this loop) |
| if ((_type != null) && (_type instanceof ResultTreeType)) { |
| il.append(methodGen.storeDOM()); |
| } |
| |
| // Restore current node and current iterator from the stack |
| il.append(methodGen.storeIterator()); |
| il.append(methodGen.storeCurrentNode()); |
| } |
| |
| /** |
| * The code that is generated by nested for-each loops can appear to some |
| * JVMs as if it is accessing un-initialized variables. We must add some |
| * code that pushes the default variable value on the stack and pops it |
| * into the variable slot. This is done by the Variable.initialize() |
| * method. The code that we compile for this loop looks like this: |
| * |
| * initialize iterator |
| * initialize variables <-- HERE!!! |
| * goto Iterate |
| * Loop: : |
| * : (code for <xsl:for-each> contents) |
| * : |
| * Iterate: node = iterator.next(); |
| * if (node != END) goto Loop |
| */ |
| public void initializeVariables(ClassGenerator classGen, |
| MethodGenerator methodGen) { |
| final int n = elementCount(); |
| for (int i = 0; i < n; i++) { |
| final Object child = getContents().elementAt(i); |
| if (child instanceof Variable) { |
| Variable var = (Variable)child; |
| var.initialize(classGen, methodGen); |
| } |
| } |
| } |
| |
| } |