001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018 /*
019 * $Id: ContainsCall.java 468650 2006-10-28 07:03:30Z minchau $
020 */
021
022 package org.apache.xalan.xsltc.compiler;
023
024 import java.util.Vector;
025
026 import org.apache.bcel.generic.ConstantPoolGen;
027 import org.apache.bcel.generic.IFLT;
028 import org.apache.bcel.generic.INVOKEVIRTUAL;
029 import org.apache.bcel.generic.InstructionList;
030 import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
031 import org.apache.xalan.xsltc.compiler.util.ErrorMsg;
032 import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
033 import org.apache.xalan.xsltc.compiler.util.Type;
034 import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
035
036 /**
037 * @author Jacek Ambroziak
038 * @author Santiago Pericas-Geertsen
039 * @author Morten Jorgensen
040 */
041 final class ContainsCall extends FunctionCall {
042
043 private Expression _base = null;
044 private Expression _token = null;
045
046 /**
047 * Create a contains() call - two arguments, both strings
048 */
049 public ContainsCall(QName fname, Vector arguments) {
050 super(fname, arguments);
051 }
052
053 /**
054 * This XPath function returns true/false values
055 */
056 public boolean isBoolean() {
057 return true;
058 }
059
060 /**
061 * Type check the two parameters for this function
062 */
063 public Type typeCheck(SymbolTable stable) throws TypeCheckError {
064
065 // Check that the function was passed exactly two arguments
066 if (argumentCount() != 2) {
067 throw new TypeCheckError(ErrorMsg.ILLEGAL_ARG_ERR, getName(), this);
068 }
069
070 // The first argument must be a String, or cast to a String
071 _base = argument(0);
072 Type baseType = _base.typeCheck(stable);
073 if (baseType != Type.String)
074 _base = new CastExpr(_base, Type.String);
075
076 // The second argument must also be a String, or cast to a String
077 _token = argument(1);
078 Type tokenType = _token.typeCheck(stable);
079 if (tokenType != Type.String)
080 _token = new CastExpr(_token, Type.String);
081
082 return _type = Type.Boolean;
083 }
084
085 /**
086 * Compile the expression - leave boolean expression on stack
087 */
088 public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
089 translateDesynthesized(classGen, methodGen);
090 synthesize(classGen, methodGen);
091 }
092
093 /**
094 * Compile expression and update true/false-lists
095 */
096 public void translateDesynthesized(ClassGenerator classGen,
097 MethodGenerator methodGen) {
098 final ConstantPoolGen cpg = classGen.getConstantPool();
099 final InstructionList il = methodGen.getInstructionList();
100 _base.translate(classGen, methodGen);
101 _token.translate(classGen, methodGen);
102 il.append(new INVOKEVIRTUAL(cpg.addMethodref(STRING_CLASS,
103 "indexOf",
104 "("+STRING_SIG+")I")));
105 _falseList.add(il.append(new IFLT(null)));
106 }
107 }