1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  * @LastModified: Oct 2017
   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 com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
  25 import com.sun.org.apache.bcel.internal.generic.IFLT;
  26 import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
  27 import com.sun.org.apache.bcel.internal.generic.InstructionList;
  28 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
  29 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
  30 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
  31 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
  32 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
  33 import java.util.List;
  34 
  35 /**
  36  * @author Jacek Ambroziak
  37  * @author Santiago Pericas-Geertsen
  38  * @author Morten Jorgensen
  39  */
  40 final class ContainsCall extends FunctionCall {
  41 
  42     private Expression _base = null;
  43     private Expression _token = null;
  44 
  45     /**
  46      * Create a contains() call - two arguments, both strings
  47      */
  48     public ContainsCall(QName fname, List<Expression> arguments) {
  49         super(fname, arguments);
  50     }
  51 
  52     /**
  53      * This XPath function returns true/false values
  54      */
  55     public boolean isBoolean() {
  56         return true;
  57     }
  58 
  59     /**
  60      * Type check the two parameters for this function
  61      */
  62     public Type typeCheck(SymbolTable stable) throws TypeCheckError {
  63 
  64         // Check that the function was passed exactly two arguments
  65         if (argumentCount() != 2) {
  66             throw new TypeCheckError(ErrorMsg.ILLEGAL_ARG_ERR, getName(), this);
  67         }
  68 
  69         // The first argument must be a String, or cast to a String
  70         _base = argument(0);
  71         Type baseType = _base.typeCheck(stable);
  72         if (baseType != Type.String)
  73             _base = new CastExpr(_base, Type.String);
  74 
  75         // The second argument must also be a String, or cast to a String
  76         _token = argument(1);
  77         Type tokenType = _token.typeCheck(stable);
  78         if (tokenType != Type.String)
  79             _token = new CastExpr(_token, Type.String);
  80 
  81         return _type = Type.Boolean;
  82     }
  83 
  84     /**
  85      * Compile the expression - leave boolean expression on stack
  86      */
  87     public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
  88         translateDesynthesized(classGen, methodGen);
  89         synthesize(classGen, methodGen);
  90     }
  91 
  92     /**
  93      * Compile expression and update true/false-lists
  94      */
  95     public void translateDesynthesized(ClassGenerator classGen,
  96                                        MethodGenerator methodGen) {
  97         final ConstantPoolGen cpg = classGen.getConstantPool();
  98         final InstructionList il = methodGen.getInstructionList();
  99         _base.translate(classGen, methodGen);
 100         _token.translate(classGen, methodGen);
 101         il.append(new INVOKEVIRTUAL(cpg.addMethodref(STRING_CLASS,
 102                                                      "indexOf",
 103                                                      "("+STRING_SIG+")I")));
 104         _falseList.add(il.append(new IFLT(null)));
 105     }
 106 }