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.engine;
17:
18: import org.springframework.webflow.execution.FlowExecutionException;
19: import org.springframework.webflow.execution.ViewSelection;
20:
21: /**
22: * A strategy for handling an exception that occurs at runtime during the
23: * execution of a flow definition.
24: *
25: * @author Keith Donald
26: */
27: public interface FlowExecutionExceptionHandler {
28:
29: /**
30: * Can this handler handle the given exception?
31: * @param exception the exception that occured
32: * @return true if yes, false if no
33: */
34: public boolean handles(FlowExecutionException exception);
35:
36: /**
37: * Handle the exception in the context of the current request, optionally
38: * making an error view selection that should be rendered.
39: * @param exception the exception that occured
40: * @param context the execution control context for this request
41: * @return the selected error view that should be displayed (may be null if
42: * the handler chooses not to select a view, in which case other exception
43: * handlers may be given a chance to handle the exception)
44: */
45: public ViewSelection handle(FlowExecutionException exception,
46: RequestControlContext context);
47: }
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