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/*
* $Id: IdKeyPattern.java,v 1.11 2010-11-01 04:34:16 joehw 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(new INVOKEVIRTUAL(lookupId));
}
else
{
il.append(new INVOKEVIRTUAL(lookupKey));
}
_trueList.add(il.append(new IFNE(null)));
_falseList.add(il.append(new GOTO(null)));
}
}