01: /*
02: * Copyright 2004-2007 the original author or authors.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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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