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annotate src/org/tmatesoft/hg/core/SessionContext.java @ 539:9edfd5a223b8

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Commit: handle empty repository case
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 13 Feb 2013 18:44:58 +0100
parents b3c16d1aede0
children e4ee4bf4c7d0
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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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18
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19 import org.tmatesoft.hg.util.LogFacility;
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21 /**
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22 * Access to objects that might need to be shared between various distinct operations ran during the same working session
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23 * (i.e. caches, log, etc.). It's unspecified whether session context is per repository or can span multiple repositories
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24 *
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25 * <p>Note, API is likely to be extended in future versions, adding more object to share.
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26 *
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27 * @author Artem Tikhomirov
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28 * @author TMate Software Ltd.
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29 */
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30 public abstract class SessionContext {
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31 // abstract class to facilitate adding more functionality without API break
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32
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33 /**
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34 * Access wrapper for a system log facility.
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35 * @return facility to direct dumps to, never <code>null</code>
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36 */
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37 public abstract LogFacility getLog();
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38
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39 /**
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40 * Access configuration parameters of the session.
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41 * @param name name of the session configuration parameter
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42 * @param defaultValue value to return if parameter is not configured
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43 * @return value of the session parameter, defaultValue if none found
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44 */
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45 public abstract Object getConfigurationProperty(String name, Object defaultValue);
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46 // perhaps, later may add Configuration object, with PropertyMarshal's helpers
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47 // e.g. when there's standalone Caches and WritableSessionProperties objects
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49 /**
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50 * Providers of the context may implement
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51 */
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52 public interface Source {
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53 SessionContext getSessionContext();
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54 }
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55 }