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annotate src/org/tmatesoft/hg/core/SessionContext.java @ 585:b47ef0d2777b

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 25 Apr 2013 17:53:44 +0200
parents e4ee4bf4c7d0
children fba85bc1dfb8
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1 /*
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2 * Copyright (c) 2011-2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.core;
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19 import org.tmatesoft.hg.util.LogFacility;
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20 import org.tmatesoft.hg.util.Path;
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22 /**
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23 * Access to objects that might need to be shared between various distinct operations ran during the same working session
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24 * (i.e. caches, log, etc.). It's unspecified whether session context is per repository or can span multiple repositories
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25 *
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26 * <p>Note, API is likely to be extended in future versions, adding more object to share.
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27 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 public abstract class SessionContext {
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32 // abstract class to facilitate adding more functionality without API break
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34 /**
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35 * Access wrapper for a system log facility.
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36 * @return facility to direct dumps to, never <code>null</code>
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37 */
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38 public abstract LogFacility getLog();
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39
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40 /**
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41 * Access configuration parameters of the session.
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42 * @param name name of the session configuration parameter
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43 * @param defaultValue value to return if parameter is not configured
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44 * @return value of the session parameter, defaultValue if none found
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45 */
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46 public abstract Object getConfigurationProperty(String name, Object defaultValue);
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47 // perhaps, later may add Configuration object, with PropertyMarshal's helpers
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48 // e.g. when there's standalone Caches and WritableSessionProperties objects
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50 /**
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51 * Provide a factory to create {@link Path} objects.
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52 *
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53 * Occasionally, there's a need to construct a {@link Path} object from a string/byte data
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54 * kept in mercurial control files. Generally, default implementation (with {@link Path#create(CharSequence)}
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55 * is enough, however, if there's a need to control number of string objects in memory (i.e. prevent duplicates),
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56 * default implementation might need to be replaced with more sophisticated (e.g. using weak references or
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57 * just a huge hash set).
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58 *
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59 * @return factory to construct Path objects, never <code>null</code>
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60 */
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61 public Path.Source getPathFactory() {
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62 return new Path.Source() {
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63 public Path path(CharSequence p) {
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64 return Path.create(p);
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65 }
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66 };
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67 }
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68
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69 /**
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70 * Providers of the context may implement
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71 */
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72 public interface Source {
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73 SessionContext getSessionContext();
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74 }
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75 }