Mercurial > hg > blitz_stable
annotate src/org/prevayler/implementation/NumberFileFinder.java @ 0:3dc0c5604566
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author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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1 /* |
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2 The copyright of all source code included in this Prevayler distribution is |
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3 held by Klaus Wuestefeld, except the files that specifically state otherwise. |
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4 All rights are reserved. "PREVAYLER" is a trademark of Klaus Wuestefeld. |
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5 |
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6 |
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7 BSD License: |
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8 |
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9 Redistribution and use in source and binary forms, with or without |
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10 modification, are permitted provided that the following conditions are met: |
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11 |
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12 - Redistributions of source code must retain the above copyright notice, this |
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13 list of conditions and the following disclaimer. |
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14 |
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15 - Redistributions in binary form must reproduce the above copyright notice, |
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16 this list of conditions and the following disclaimer in the documentation |
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17 and/or other materials provided with the distribution. |
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18 |
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19 - Neither the name of Prevayler nor the names of its contributors may be used |
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20 to endorse or promote products derived from this software without specific |
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21 prior written permission. |
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22 |
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23 |
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24 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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25 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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26 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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27 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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28 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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29 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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30 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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31 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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32 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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33 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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34 POSSIBILITY OF SUCH DAMAGE. |
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35 */ |
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36 |
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37 package org.prevayler.implementation; |
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38 |
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39 import java.io.*; |
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40 import java.util.Arrays; |
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41 import java.text.*; |
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42 |
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43 /** Finds the last .snapshot file by number and finds all the subsequent pending .log files. |
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44 */ |
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45 class NumberFileFinder { |
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46 |
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47 private File directory; |
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48 private File lastSnapshot; |
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49 private long fileNumber; |
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50 private NumberFileCreator fileCreator; |
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51 |
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52 /** @throws IOException if location does not exist and cannot be created as a directory. |
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53 * @throws IllegalArgumentException If location exists and is not a directory. |
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54 */ |
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55 public NumberFileFinder(String directoryName) throws IOException { |
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56 this.directory = new File(directoryName); |
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57 if (!directory.exists() && !directory.mkdirs()) throw new IOException("Directory doesn't exist and could not be created: " + directoryName); |
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58 if (!directory.isDirectory()) throw new IllegalArgumentException("Path exists but is not a directory: " + directoryName); |
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59 |
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60 init(); |
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61 } |
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62 |
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63 /** Returns the last snapshot file. Returns null if there are no snapshots. |
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64 */ |
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65 public File lastSnapshot() { |
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66 return lastSnapshot; |
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67 } |
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68 |
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69 /** @throws EOFException if there are no more pending .log files. |
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70 */ |
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71 public File nextPendingLog() throws EOFException { |
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72 File log = new File(directory, NumberFileCreator.LOG_FORMAT.format(fileNumber + 1)); |
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73 if (!log.exists()) { |
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74 fileCreator = new NumberFileCreator(directory, fileNumber + 1); |
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75 throw new EOFException(); |
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76 } |
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77 ++fileNumber; |
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78 return log; |
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79 } |
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80 |
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81 /** Returns a NumberFileCreator that will start off with the first number after the last .log file number. |
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82 * @return null if there are still .log files pending. |
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83 */ |
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84 public NumberFileCreator fileCreator() { |
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85 return fileCreator; |
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86 } |
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87 |
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88 private void init() throws IOException { |
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89 findLastSnapshot(); |
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90 fileNumber = lastSnapshot == null |
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91 ? 0 |
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92 : number(lastSnapshot); |
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93 } |
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94 |
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95 private long number(File snapshot) throws NumberFormatException { //NumberFomatException is a RuntimeException. |
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96 String name = snapshot.getName(); |
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97 if (!name.endsWith("." + NumberFileCreator.SNAPSHOT_SUFFIX)) throw new NumberFormatException(); |
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98 return Long.parseLong(name.substring(0,name.indexOf('.'))); // "00000.snapshot" becomes "00000". |
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99 //The following doesn't work! It throws ParseException (UnparseableNumber): return (NumberFileCreator.SNAPSHOT_FORMAT.parse(snapshot.getName())).longValue(); |
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100 } |
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101 |
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102 private void findLastSnapshot() throws IOException { |
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103 File[] snapshots = directory.listFiles(new SnapshotFilter()); |
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104 if (snapshots == null) throw new IOException("Error reading file list from directory " + directory); |
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105 |
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106 Arrays.sort(snapshots); |
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107 |
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108 lastSnapshot = snapshots.length > 0 |
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109 ? snapshots[snapshots.length - 1] |
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110 : null; |
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111 } |
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112 |
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113 |
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114 private class SnapshotFilter implements FileFilter { |
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115 |
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116 public boolean accept(File file) { |
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parents:
diff
changeset
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117 try { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
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118 number(file); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
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119 } catch (NumberFormatException nfx) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
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120 return false; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
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121 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
122 return true; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
123 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
124 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
125 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
126 } |