TempStorage.java revision 96c5af40d639d629267794f4f0338a267ff94ce5 
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2 * Licensed to the Apache Software Foundation (ASF) under one   *
3 * or more contributor license agreements.  See the NOTICE file *
4 * distributed with this work for additional information        *
5 * regarding copyright ownership.  The ASF licenses this file   *
6 * to you under the Apache License, Version 2.0 (the            *
7 * "License"); you may not use this file except in compliance   *
8 * with the License.  You may obtain a copy of the License at   *
9 *                                                              *
10 *   http://www.apache.org/licenses/LICENSE-2.0                 *
11 *                                                              *
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13 * software distributed under the License is distributed on an  *
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
15 * KIND, either express or implied.  See the License for the    *
16 * specific language governing permissions and limitations      *
17 * under the License.                                           *
18 ****************************************************************/
19
20package org.apache.james.mime4j.util;
21
22import org.apache.commons.logging.Log;
23import org.apache.commons.logging.LogFactory;
24
25/**
26 *
27 * @version $Id: TempStorage.java,v 1.2 2004/10/02 12:41:11 ntherning Exp $
28 */
29public abstract class TempStorage {
30    private static Log log = LogFactory.getLog(TempStorage.class);
31    private static TempStorage inst = null;
32
33    static {
34
35        String clazz = System.getProperty("org.apache.james.mime4j.tempStorage");
36        try {
37
38            if (inst != null) {
39                inst = (TempStorage) Class.forName(clazz).newInstance();
40            }
41
42        } catch (Throwable t) {
43            log.warn("Unable to create or instantiate TempStorage class '"
44                      + clazz + "' using SimpleTempStorage instead", t);
45        }
46
47        if (inst == null) {
48            inst = new SimpleTempStorage();
49        }
50    }
51
52    /**
53     * Gets the root temporary path which should be used to
54     * create new temporary paths or files.
55     *
56     * @return the root temporary path.
57     */
58    public abstract TempPath getRootTempPath();
59
60    public static TempStorage getInstance() {
61        return inst;
62    }
63
64    public static void setInstance(TempStorage inst) {
65        if (inst == null) {
66            throw new NullPointerException("inst");
67        }
68        TempStorage.inst = inst;
69    }
70}
71