1 /*
   2  * reserved comment block
   3  * DO NOT REMOVE OR ALTER!
   4  */
   5 /*
   6  * Licensed to the Apache Software Foundation (ASF) under one or more
   7  * contributor license agreements.  See the NOTICE file distributed with
   8  * this work for additional information regarding copyright ownership.
   9  * The ASF licenses this file to You under the Apache License, Version 2.0
  10  * (the "License"); you may not use this file except in compliance with
  11  * the License.  You may obtain a copy of the License at
  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  * Unless required by applicable law or agreed to in writing, software
  16  * distributed under the License is distributed on an "AS IS" BASIS,
  17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  * See the License for the specific language governing permissions and
  19  * limitations under the License.
  20  */
  21 
  22 package com.sun.org.apache.xalan.internal.xsltc.compiler;
  23 
  24 import java.util.Vector;
  25 
  26 import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
  27 import com.sun.org.apache.bcel.internal.generic.IFLT;
  28 import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
  29 import com.sun.org.apache.bcel.internal.generic.InstructionList;
  30 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
  31 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
  32 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
  33 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
  34 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
  35 
  36 /**
  37  * @author Jacek Ambroziak
  38  * @author Santiago Pericas-Geertsen
  39  * @author Morten Jorgensen
  40  */
  41 final class ContainsCall extends FunctionCall {
  42 
  43     private Expression _base = null;
  44     private Expression _token = null;
  45 
  46     /**
  47      * Create a contains() call - two arguments, both strings
  48      */
  49     public ContainsCall(QName fname, Vector arguments) {
  50         super(fname, arguments);
  51     }
  52 
  53     /**
  54      * This XPath function returns true/false values
  55      */
  56     public boolean isBoolean() {
  57         return true;
  58     }
  59 
  60     /**
  61      * Type check the two parameters for this function
  62      */
  63     public Type typeCheck(SymbolTable stable) throws TypeCheckError {
  64 
  65         // Check that the function was passed exactly two arguments
  66         if (argumentCount() != 2) {
  67             throw new TypeCheckError(ErrorMsg.ILLEGAL_ARG_ERR, getName(), this);
  68         }
  69 
  70         // The first argument must be a String, or cast to a String
  71         _base = argument(0);
  72         Type baseType = _base.typeCheck(stable);
  73         if (baseType != Type.String)
  74             _base = new CastExpr(_base, Type.String);
  75 
  76         // The second argument must also be a String, or cast to a String
  77         _token = argument(1);
  78         Type tokenType = _token.typeCheck(stable);
  79         if (tokenType != Type.String)
  80             _token = new CastExpr(_token, Type.String);
  81 
  82         return _type = Type.Boolean;
  83     }
  84 
  85     /**
  86      * Compile the expression - leave boolean expression on stack
  87      */
  88     public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
  89         translateDesynthesized(classGen, methodGen);
  90         synthesize(classGen, methodGen);
  91     }
  92 
  93     /**
  94      * Compile expression and update true/false-lists
  95      */
  96     public void translateDesynthesized(ClassGenerator classGen,
  97                                        MethodGenerator methodGen) {
  98         final ConstantPoolGen cpg = classGen.getConstantPool();
  99         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 }