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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")));
    }
}