content: /*
   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  /*
   * Copyright 2001-2004 The Apache Software Foundation.
   *
   * Licensed 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: AlternativePattern.java,v 1.2.4.1 2005/09/01 09:18:46 pvedula Exp $
   */
  
  package jaxp.sun.org.apache.xalan.internal.xsltc.compiler;
  
  import jaxp.sun.org.apache.bcel.internal.generic.GOTO;
  import jaxp.sun.org.apache.bcel.internal.generic.InstructionHandle;
  import jaxp.sun.org.apache.bcel.internal.generic.InstructionList;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
  
  /**
   * @author Jacek Ambroziak
   * @author Santiago Pericas-Geertsen
   */
  final class AlternativePattern extends Pattern {
      private final Pattern _left;
      private final Pattern _right;
  
      /**
       * Construct an alternative pattern. The method <code>setParent</code>
       * should not be called in this case.
       */
      public AlternativePattern(Pattern left, Pattern right) {
          _left = left;
          _right = right;
      }
  
      public void setParser(Parser parser) {
          super.setParser(parser);
          _left.setParser(parser);
          _right.setParser(parser);
      }
  
      public Pattern getLeft() {
          return _left;
      }
  
      public Pattern getRight() {
          return _right;
      }
  
      /**
       * The type of an '|' is not really defined, hence null is returned.
       */
      public Type typeCheck(SymbolTable stable) throws TypeCheckError {
          _left.typeCheck(stable);
          _right.typeCheck(stable);
          return null;
      }
  
      public double getPriority() {
          double left = _left.getPriority();
          double right = _right.getPriority();
  
          if (left < right)
              return(left);
          else
              return(right);
      }
  
      public String toString() {
          return "alternative(" + _left + ", " + _right + ')';
      }
  
      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
          final InstructionList il = methodGen.getInstructionList();
  
          _left.translate(classGen, methodGen);
          final InstructionHandle gotot = il.append(new GOTO(null));
          il.append(methodGen.loadContextNode());
          _right.translate(classGen, methodGen);
  
          _left._trueList.backPatch(gotot);
          _left._falseList.backPatch(gotot.getNext());
  
          _trueList.append(_right._trueList.add(gotot));
          _falseList.append(_right._falseList);
      }
  }
  