code: /*
   * 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
   * limitations under the License.
   */
  /*
   * $Id$
   */
  
  package org.apache.xalan.xsltc.compiler;
  
  import org.apache.bcel.generic.ConstantPoolGen;
  import org.apache.bcel.generic.GOTO;
  import org.apache.bcel.generic.InstructionList;
  import org.apache.bcel.generic.PUSH;
  import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
  import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
  import org.apache.xalan.xsltc.compiler.util.Type;
  import org.apache.xalan.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)));
  	}
      }
  }
  