/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You under the Apache License, Version 2.0

 * (the "License"); you may not use this file except in compliance with

 * the License.  You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

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package com.sun.org.apache.xalan.internal.xsltc.compiler;

import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;

import com.sun.org.apache.bcel.internal.generic.GOTO;

import com.sun.org.apache.bcel.internal.generic.InstructionList;

import com.sun.org.apache.bcel.internal.generic.PUSH;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;

/**

 * This class implements inlined calls to the XSLT standard functions

 * true() and false().

 * @author Jacek Ambroziak

 * @author Santiago Pericas-Geertsen

 */

final class BooleanExpr extends Expression {

    private boolean _value;

    public BooleanExpr(boolean value) {

        _value = value;

    }

    public Type typeCheck(SymbolTable stable) throws TypeCheckError {

        _type = Type.Boolean;

        return _type;

    }

    public String toString() {

        return _value ? "true()" : "false()";

    }

    public boolean getValue() {

        return _value;

    }

    public boolean contextDependent() {

        return false;

    }

    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {

        ConstantPoolGen cpg = classGen.getConstantPool();

        InstructionList il = methodGen.getInstructionList();

        il.append(new PUSH(cpg, _value));

    }

    public void translateDesynthesized(ClassGenerator classGen,

                                       MethodGenerator methodGen) {

        final InstructionList il = methodGen.getInstructionList();

        if (_value) {

            il.append(NOP);     // true list falls through

        }

        else {

            _falseList.add(il.append(new GOTO(null)));

        }

    }

}