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 com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
25import com.sun.org.apache.bcel.internal.generic.GOTO;
26import com.sun.org.apache.bcel.internal.generic.InstructionList;
27import com.sun.org.apache.bcel.internal.generic.PUSH;
28import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
29import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
30import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
31import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
32
33/**
34 * This class implements inlined calls to the XSLT standard functions
35 * true() and false().
36 * @author Jacek Ambroziak
37 * @author Santiago Pericas-Geertsen
38 */
39final class BooleanExpr extends Expression {
40    private boolean _value;
41
42    public BooleanExpr(boolean value) {
43        _value = value;
44    }
45
46    public Type typeCheck(SymbolTable stable) throws TypeCheckError {
47        _type = Type.Boolean;
48        return _type;
49    }
50
51    public String toString() {
52        return _value ? "true()" : "false()";
53    }
54
55    public boolean getValue() {
56        return _value;
57    }
58
59    public boolean contextDependent() {
60        return false;
61    }
62
63    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
64        ConstantPoolGen cpg = classGen.getConstantPool();
65        InstructionList il = methodGen.getInstructionList();
66        il.append(new PUSH(cpg, _value));
67    }
68
69    public void translateDesynthesized(ClassGenerator classGen,
70                                       MethodGenerator methodGen) {
71        final InstructionList il = methodGen.getInstructionList();
72        if (_value) {
73            il.append(NOP);     // true list falls through
74        }
75        else {
76            _falseList.add(il.append(new GOTO(null)));
77        }
78    }
79}
80