- /*
- * 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: IdKeyPattern.java,v 1.10 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.GOTO;
- import com.sun.org.apache.bcel.internal.generic.IFNE;
- import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
- 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.PUSH;
- 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.Type;
- import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
-
- /**
- * @author Jacek Ambroziak
- * @author Santiago Pericas-Geertsen
- */
- abstract class IdKeyPattern extends LocationPathPattern {
-
- protected RelativePathPattern _left = null;;
- private String _index = null;
- private String _value = null;;
-
- public IdKeyPattern(String index, String value) {
- _index = index;
- _value = value;
- }
-
- public String getIndexName() {
- return(_index);
- }
-
- public Type typeCheck(SymbolTable stable) throws TypeCheckError {
- return Type.NodeSet;
- }
-
- public boolean isWildcard() {
- return false;
- }
-
- public void setLeft(RelativePathPattern left) {
- _left = left;
- }
-
- public StepPattern getKernelPattern() {
- return(null);
- }
-
- public void reduceKernelPattern() { }
-
- public String toString() {
- return "id/keyPattern(" + _index + ", " + _value + ')';
- }
-
- /**
- * This method is called when the constructor is compiled in
- * Stylesheet.compileConstructor() and not as the syntax tree is traversed.
- */
- public void translate(ClassGenerator classGen,
- MethodGenerator methodGen) {
-
- final ConstantPoolGen cpg = classGen.getConstantPool();
- final InstructionList il = methodGen.getInstructionList();
-
- // Returns the KeyIndex object of a given name
- final int getKeyIndex = cpg.addMethodref(TRANSLET_CLASS,
- "getKeyIndex",
- "(Ljava/lang/String;)"+
- KEY_INDEX_SIG);
-
- // Initialises a KeyIndex to return nodes with specific values
- final int lookupId = cpg.addMethodref(KEY_INDEX_CLASS,
- "containsID",
- "(ILjava/lang/Object;)I");
- final int lookupKey = cpg.addMethodref(KEY_INDEX_CLASS,
- "containsKey",
- "(ILjava/lang/Object;)I");
- final int getNodeIdent = cpg.addInterfaceMethodref(DOM_INTF,
- "getNodeIdent",
- "(I)"+NODE_SIG);
-
- // Call getKeyIndex in AbstractTranslet with the name of the key
- // to get the index for this key (which is also a node iterator).
- il.append(classGen.loadTranslet());
- il.append(new PUSH(cpg,_index));
- il.append(new INVOKEVIRTUAL(getKeyIndex));
-
- // Now use the value in the second argument to determine what nodes
- // the iterator should return.
- il.append(SWAP);
- il.append(new PUSH(cpg,_value));
- if (this instanceof IdPattern)
- {
- il.append(SWAP);
- il.append(methodGen.loadDOM());
- il.append(SWAP);
- il.append(new INVOKEINTERFACE(getNodeIdent, 2));
- il.append(SWAP);
- il.append(new INVOKEVIRTUAL(lookupId));
- }
- else
- {
- il.append(SWAP);
- il.append(methodGen.loadDOM());
- il.append(SWAP);
- il.append(new INVOKEINTERFACE(getNodeIdent, 2));
- il.append(SWAP);
- il.append(new INVOKEVIRTUAL(lookupKey));
- }
-
- _trueList.add(il.append(new IFNE(null)));
- _falseList.add(il.append(new GOTO(null)));
- }
-
- }
-