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/*
* $Id: ConcatCall.java,v 1.10 2010-11-01 04:34:15 joehw Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler;
import java.util.Vector;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
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.Instruction;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.NEW;
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
*/
final class ConcatCall extends FunctionCall {
public ConcatCall(QName fname, Vector arguments) {
super(fname, arguments);
}
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
for (int i = 0; i < argumentCount(); i++) {
final Expression exp = argument(i);
if (!exp.typeCheck(stable).identicalTo(Type.String)) {
setArgument(i, new CastExpr(exp, Type.String));
}
}
return _type = Type.String;
}
/** translate leaves a String on the stack */
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
final int nArgs = argumentCount();
switch (nArgs) {
case 0:
il.append(new PUSH(cpg, EMPTYSTRING));
break;
case 1:
argument().translate(classGen, methodGen);
break;
default:
final int initBuffer = cpg.addMethodref(STRING_BUFFER_CLASS,
"", "()V");
final Instruction append =
new INVOKEVIRTUAL(cpg.addMethodref(STRING_BUFFER_CLASS,
"append",
"("+STRING_SIG+")"
+STRING_BUFFER_SIG));
final int toString = cpg.addMethodref(STRING_BUFFER_CLASS,
"toString",
"()"+STRING_SIG);
il.append(new NEW(cpg.addClass(STRING_BUFFER_CLASS)));
il.append(DUP);
il.append(new INVOKESPECIAL(initBuffer));
for (int i = 0; i < nArgs; i++) {
argument(i).translate(classGen, methodGen);
il.append(append);
}
il.append(new INVOKEVIRTUAL(toString));
}
}
}