01: /*
02: * Copyright 2005 Joe Walker
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.directwebremoting.extend;
17:
18: import java.io.IOException;
19:
20: /**
21: * A DownloadManager allows you to inject files into the system and then
22: * retrieve them via a servlet at some later date.
23: * @author Joe Walker [joe at getahead dot ltd dot uk]
24: */
25: public interface DownloadManager {
26: /**
27: * Inject a file into the system for later download.
28: * @param generator The representation of the file to inject
29: * @return A URL for how to allow download of this data at a later time
30: * @throws IOException If there are problems reading from the {@link FileGenerator}
31: */
32: String addFile(FileGenerator generator) throws IOException;
33:
34: /**
35: * Retrieve a file previously injected into the system with
36: * {@link #addFile(FileGenerator)}
37: * @param id The id of the {@link FileGenerator} to retrieve
38: */
39: FileGenerator getFile(String id);
40: }
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