content: /*
   * Copyright 2016 HuntBugs contributors
   * 
   * 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.
   */
  package one.util.huntbugs.flow;
  
  import com.strobel.decompiler.ast.Expression;
  
  /**
   * @author lan
   *
   */
  interface Dataflow<FACT, STATE> {
      public STATE makeEntryState();
  
      public STATE transferState(STATE src, Expression expr);
  
      public STATE transferExceptionalState(STATE src, Expression expr);
      
      public TrueFalse<STATE> transferConditionalState(STATE src, Expression expr);
  
      public STATE mergeStates(STATE s1, STATE s2);
      
      public boolean sameState(STATE s1, STATE s2);
      
      public FACT makeFact(STATE state, Expression expr);
      
      public FACT makeUnknownFact();
      
      public FACT mergeFacts(FACT f1, FACT f2);
      
      public boolean sameFact(FACT f1, FACT f2);
      
      public default void onSuccess(STATE exitState) {};
      
      public default void onFail(STATE exitState) {};
  }
  