/*
* 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: IdKeyPattern.java 468650 2006-10-28 07:03:30Z minchau $
*/
package org.apache.xalan.xsltc.compiler;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.GOTO;
import org.apache.bcel.generic.IFNE;
import org.apache.bcel.generic.INVOKEINTERFACE;
import org.apache.bcel.generic.INVOKEVIRTUAL;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.PUSH;
import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
import org.apache.xalan.xsltc.compiler.util.Type;
import org.apache.xalan.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(new INVOKEVIRTUAL(lookupId));
}
else
{
il.append(new INVOKEVIRTUAL(lookupKey));
}
_trueList.add(il.append(new IFNE(null)));
_falseList.add(il.append(new GOTO(null)));
}
}