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/*
* $Id: StartsWithCall.java,v 1.10 2010-11-01 04:34:17 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.INVOKEVIRTUAL;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
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
* @author Morten Jorgensen
*/
final class StartsWithCall extends FunctionCall {
private Expression _base = null;
private Expression _token = null;
/**
* Create a starts-with() call - two arguments, both strings
*/
public StartsWithCall(QName fname, Vector arguments) {
super(fname, arguments);
}
/**
* Type check the two parameters for this function
*/
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
// Check that the function was passed exactly two arguments
if (argumentCount() != 2) {
ErrorMsg err = new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR,
getName(), this);
throw new TypeCheckError(err);
}
// The first argument must be a String, or cast to a String
_base = argument(0);
Type baseType = _base.typeCheck(stable);
if (baseType != Type.String)
_base = new CastExpr(_base, Type.String);
// The second argument must also be a String, or cast to a String
_token = argument(1);
Type tokenType = _token.typeCheck(stable);
if (tokenType != Type.String)
_token = new CastExpr(_token, Type.String);
return _type = Type.Boolean;
}
/**
* Compile the expression - leave boolean expression on stack
*/
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
_base.translate(classGen, methodGen);
_token.translate(classGen, methodGen);
il.append(new INVOKEVIRTUAL(cpg.addMethodref(STRING_CLASS,
"startsWith",
"("+STRING_SIG+")Z")));
}
}