- /*
- * Copyright 2001-2004 The Apache Software Foundation.
- *
- * Licensed 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: StartsWithCall.java,v 1.7 2004/02/16 22:24:29 minchau 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")));
- }
- }