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
22package com.sun.org.apache.xalan.internal.xsltc.compiler;
23
24import java.util.Vector;
25
26import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
27import com.sun.org.apache.bcel.internal.generic.IFLT;
28import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
29import com.sun.org.apache.bcel.internal.generic.InstructionList;
30import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
31import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
32import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
33import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
34import 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 */
41final 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}
108