1 | /**************************************************************** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one * |
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3 | * or more contributor license agreements. See the NOTICE file * |
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4 | * distributed with this work for additional information * |
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5 | * regarding copyright ownership. The ASF licenses this file * |
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6 | * to you under the Apache License, Version 2.0 (the * |
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7 | * "License"); you may not use this file except in compliance * |
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8 | * with the License. You may obtain a copy of the License at * |
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9 | * * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 * |
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11 | * * |
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12 | * Unless required by applicable law or agreed to in writing, * |
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13 | * software distributed under the License is distributed on an * |
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14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * |
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15 | * KIND, either express or implied. See the License for the * |
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16 | * specific language governing permissions and limitations * |
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17 | * under the License. * |
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18 | ****************************************************************/ |
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19 | |
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20 | package org.apache.james.mime4j.storage; |
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21 | |
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22 | import java.io.ByteArrayInputStream; |
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23 | import java.io.IOException; |
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24 | import java.io.InputStream; |
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25 | |
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26 | import org.apache.james.mime4j.util.ByteArrayBuffer; |
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27 | |
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28 | /** |
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29 | * A {@link StorageProvider} that stores the data entirely in memory. |
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30 | * <p> |
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31 | * Example usage: |
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32 | * |
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33 | * <pre> |
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34 | * StorageProvider provider = new MemoryStorageProvider(); |
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35 | * DefaultStorageProvider.setInstance(provider); |
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36 | * </pre> |
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37 | */ |
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38 | public class MemoryStorageProvider extends AbstractStorageProvider { |
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39 | |
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40 | /** |
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41 | * Creates a new <code>MemoryStorageProvider</code>. |
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42 | */ |
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43 | public MemoryStorageProvider() { |
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44 | } |
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45 | |
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46 | public StorageOutputStream createStorageOutputStream() { |
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47 | return new MemoryStorageOutputStream(); |
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48 | } |
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49 | |
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50 | private static final class MemoryStorageOutputStream extends |
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51 | StorageOutputStream { |
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52 | ByteArrayBuffer bab = new ByteArrayBuffer(1024); |
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53 | |
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54 | @Override |
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55 | protected void write0(byte[] buffer, int offset, int length) |
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56 | throws IOException { |
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57 | bab.append(buffer, offset, length); |
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58 | } |
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59 | |
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60 | @Override |
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61 | protected Storage toStorage0() throws IOException { |
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62 | return new MemoryStorage(bab.buffer(), bab.length()); |
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63 | } |
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64 | } |
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65 | |
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66 | static final class MemoryStorage implements Storage { |
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67 | private byte[] data; |
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68 | private final int count; |
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69 | |
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70 | public MemoryStorage(byte[] data, int count) { |
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71 | this.data = data; |
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72 | this.count = count; |
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73 | } |
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74 | |
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75 | public InputStream getInputStream() throws IOException { |
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76 | if (data == null) |
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77 | throw new IllegalStateException("storage has been deleted"); |
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78 | |
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79 | return new ByteArrayInputStream(data, 0, count); |
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80 | } |
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81 | |
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82 | public void delete() { |
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83 | data = null; |
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84 | } |
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85 | } |
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86 | |
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87 | } |
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