FlowExecutionKey


1   /*
2    * Copyright 2002-2006 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.springframework.webflow.execution.repository;
17  
18  import java.io.Serializable  ;
19  
20  /**
21   * A key that uniquely identifies a flow execution in a managed
22   * {@link FlowExecutionRepository}. Serves as a flow execution's persistent
23   * identity.
24   * <p>
25   * This class is abstract. The repository subsystem encapsulates the structure
26   * of concrete key implementations.
27   * 
28   * @author Keith Donald
29   */
30  public abstract class FlowExecutionKey implements Serializable   {
31  
32      /**
33       * Subclasses should override toString to return a parseable string form of
34       * the key.
35       * @see java.lang.Object#toString()
36       * @see FlowExecutionRepository#parseFlowExecutionKey(String)
37       */
38      public abstract String   toString();
39  }

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