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.util;
17:
18: import java.io.Serializable;
19:
20: /**
21: * A strategy for generating ids for uniquely identifying execution artifacts
22: * such as FlowExecutions and any other uniquely identified flow artifact.
23: *
24: * @author Keith Donald
25: */
26: public interface UidGenerator {
27:
28: /**
29: * Generate a new unique id.
30: * @return a serializable id, guaranteed to be unique in some context
31: */
32: public Serializable generateUid();
33:
34: /**
35: * Convert the string-encoded uid into its original object form.
36: * @param encodedUid the string encoded uid
37: * @return the converted uid
38: */
39: public Serializable parseUid(String encodedUid);
40: }
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