- /*
- * Copyright 2001-2004 The Apache Software Foundation.
- *
- * Licensed 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: FilterParentPath.java,v 1.13 2004/02/16 22:24:29 minchau Exp $
- */
-
- package com.sun.org.apache.xalan.internal.xsltc.compiler;
-
- import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
- import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
- import com.sun.org.apache.bcel.internal.generic.INVOKESPECIAL;
- import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
- import com.sun.org.apache.bcel.internal.generic.InstructionList;
- import com.sun.org.apache.bcel.internal.generic.NEW;
- import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
- import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
- import com.sun.org.apache.xalan.internal.xsltc.compiler.util.NodeSetType;
- import com.sun.org.apache.xalan.internal.xsltc.compiler.util.NodeType;
- import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ReferenceType;
- import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
- import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
-
- /**
- * @author Jacek Ambroziak
- * @author Santiago Pericas-Geertsen
- */
- final class FilterParentPath extends Expression {
-
- private Expression _filterExpr;
- private Expression _path;
- private boolean _hasDescendantAxis = false;
-
- public FilterParentPath(Expression filterExpr, Expression path) {
- (_path = path).setParent(this);
- (_filterExpr = filterExpr).setParent(this);
- }
-
- public void setParser(Parser parser) {
- super.setParser(parser);
- _filterExpr.setParser(parser);
- _path.setParser(parser);
- }
-
- public String toString() {
- return "FilterParentPath(" + _filterExpr + ", " + _path + ')';
- }
-
- public void setDescendantAxis() {
- _hasDescendantAxis = true;
- }
-
- /**
- * Type check a FilterParentPath. If the filter is not a node-set add a
- * cast to node-set only if it is of reference type. This type coercion is
- * needed for expressions like $x/LINE where $x is a parameter reference.
- */
- public Type typeCheck(SymbolTable stable) throws TypeCheckError {
- final Type ftype = _filterExpr.typeCheck(stable);
- if (ftype instanceof NodeSetType == false) {
- if (ftype instanceof ReferenceType) {
- _filterExpr = new CastExpr(_filterExpr, Type.NodeSet);
- }
- /*
- else if (ftype instanceof ResultTreeType) {
- _filterExpr = new CastExpr(_filterExpr, Type.NodeSet);
- }
- */
- else if (ftype instanceof NodeType) {
- _filterExpr = new CastExpr(_filterExpr, Type.NodeSet);
- }
- else {
- throw new TypeCheckError(this);
- }
- }
-
- // Wrap single node path in a node set
- final Type ptype = _path.typeCheck(stable);
- if (!(ptype instanceof NodeSetType)) {
- _path = new CastExpr(_path, Type.NodeSet);
- }
-
- return _type = Type.NodeSet;
- }
-
- public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
- final ConstantPoolGen cpg = classGen.getConstantPool();
- final InstructionList il = methodGen.getInstructionList();
- // Create new StepIterator
- final int initSI = cpg.addMethodref(STEP_ITERATOR_CLASS,
- "<init>",
- "("
- +NODE_ITERATOR_SIG
- +NODE_ITERATOR_SIG
- +")V");
- il.append(new NEW(cpg.addClass(STEP_ITERATOR_CLASS)));
- il.append(DUP);
-
- // Recursively compile 2 iterators
- _filterExpr.translate(classGen, methodGen);
- _path.translate(classGen, methodGen);
-
- // Initialize StepIterator with iterators from the stack
- il.append(new INVOKESPECIAL(initSI));
-
- // This is a special case for the //* path with or without predicates
- if (_hasDescendantAxis) {
- final int incl = cpg.addMethodref(NODE_ITERATOR_BASE,
- "includeSelf",
- "()" + NODE_ITERATOR_SIG);
- il.append(new INVOKEVIRTUAL(incl));
- }
-
- if (!(getParent() instanceof RelativeLocationPath) &&
- !(getParent() instanceof FilterParentPath)) {
- final int order = cpg.addInterfaceMethodref(DOM_INTF,
- ORDER_ITERATOR,
- ORDER_ITERATOR_SIG);
- il.append(methodGen.loadDOM());
- il.append(SWAP);
- il.append(methodGen.loadContextNode());
- il.append(new INVOKEINTERFACE(order, 3));
- }
- }
- }