content: /**
   * Copyright (c) 2013, Andre Steingress
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
   * following conditions are met:
   *
   * 1.) Redistributions of source code must retain the above copyright notice, this list of conditions and the following
   * disclaimer.
   * 2.) Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
   * disclaimer in the documentation and/or other materials provided with the distribution.
   * 3.) Neither the name of Andre Steingress nor the names of its contributors may be used to endorse or
   * promote products derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
   * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
   * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  package org.gcontracts.generation;
  
  import java.util.HashSet;
  
  /**
   * Keeps track of contract executions to avoid cyclic contract checks.
   *
   * @author ast
   */
  public class ContractExecutionTracker {
  
      public static final class ContractExecution {
          final String className;
          final String methodIdentifier;
          final String assertionType;
          final boolean isStatic;
  
          public ContractExecution(String className, String methodIdentifier, String assertionType, boolean isStatic)  {
              this.className = className;
              this.methodIdentifier = methodIdentifier;
              this.assertionType = assertionType;
              this.isStatic = isStatic;
          }
  
          @Override
          public boolean equals(Object o) {
              if (this == o) return true;
              if (o == null || getClass() != o.getClass()) return false;
  
              ContractExecution that = (ContractExecution) o;
  
              if (isStatic != that.isStatic) return false;
              if (assertionType != null ? !assertionType.equals(that.assertionType) : that.assertionType != null)
                  return false;
              if (className != null ? !className.equals(that.className) : that.className != null) return false;
              if (methodIdentifier != null ? !methodIdentifier.equals(that.methodIdentifier) : that.methodIdentifier != null)
                  return false;
  
              return true;
          }
  
          @Override
          public int hashCode() {
              int result = className != null ? className.hashCode() : 0;
              result = 31 * result + (methodIdentifier != null ? methodIdentifier.hashCode() : 0);
              result = 31 * result + (assertionType != null ? assertionType.hashCode() : 0);
              result = 31 * result + (isStatic ? 1 : 0);
              return result;
          }
      }
  
  
      static class ContractExecutionThreadLocal extends ThreadLocal<HashSet<ContractExecution>> {
  
          @Override
          protected HashSet<ContractExecution> initialValue() {
              return new HashSet<ContractExecution>();
          }
      }
  
      private static ThreadLocal<HashSet<ContractExecution>> executions = new ContractExecutionThreadLocal();
  
      public static boolean track(String className, String methodIdentifier, String assertionType, boolean isStatic)  {
          final ContractExecution ce = new ContractExecution(className, methodIdentifier, assertionType, isStatic);
          final HashSet<ContractExecution> contractExecutions = executions.get();
  
          if (!contractExecutions.contains(ce))  {
              contractExecutions.add(ce);
              return true;
          }
  
          return false;
      }
  
      public static void clear(String className, String methodIdentifier, String assertionType, boolean isStatic) {
          final HashSet<ContractExecution> contractExecutions = executions.get();
  
          contractExecutions.remove(new ContractExecution(className, methodIdentifier, assertionType, isStatic));
      }
  }
  