code: /****************************************************************************
  
      ePMC - an extensible probabilistic model checker
      Copyright (C) 2017
  
      This program 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.
  
      This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
  
   *****************************************************************************/
  
  package epmc.jani.explorer;
  
  import java.util.HashSet;
  import java.util.Set;
  
  import epmc.graph.explorer.ExplorerNodeProperty;
  import epmc.value.TypeBoolean;
  import epmc.value.ValueBoolean;
  
  /**
   * Node property stating whether a certain node is an initial node.
   * 
   * @author Ernst Moritz Hahn
   */
  final class PropertyNodeInitialNodes implements ExplorerNodeProperty {
      /** Explorer to which this property belongs. */
      private final ExplorerJANI explorer;
      /** Used to return the value of the property. */
      private final ValueBoolean value;
      /** Set of initial nodes of the explorer. */
      private final Set<NodeJANI> initialNodes;
  
      PropertyNodeInitialNodes(ExplorerJANI explorer) {
          assert explorer != null;
          this.explorer = explorer;
          this.initialNodes = new HashSet<>(explorer.getInitialNodes());
          TypeBoolean type = TypeBoolean.get();
          value = type.newValue();
      }
  
      @Override
      public ValueBoolean get() {
          value.set(initialNodes.contains(explorer.getQueriedNode()));
          return value;
      }
  
      @Override
      public boolean getBoolean() {
          return initialNodes.contains(explorer.getQueriedNode());
      }
  
      @Override
      public TypeBoolean getType() {
          return TypeBoolean.get();
      }
  }
  