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annotate src/org/tmatesoft/hg/core/HgAbstractCommand.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents d68dcb3b5f49
children
rev   line source
215
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1 /*
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2 * Copyright (c) 2011 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.CancelSupport;
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20 import org.tmatesoft.hg.util.ProgressSupport;
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21
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22 /**
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23 * intentionally package-local, might be removed or refactored in future
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24 *
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25 * @author Artem Tikhomirov
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26 * @author TMate Software Ltd.
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27 */
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28 class HgAbstractCommand<T extends HgAbstractCommand<?>> implements ProgressSupport.Target<T>, CancelSupport.Target<T> {
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29 private ProgressSupport progressHelper;
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30 private CancelSupport cancelHelper;
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31
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32 @SuppressWarnings("unchecked")
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33 public T set(ProgressSupport ps) {
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34 progressHelper = ps;
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35 return (T) this;
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36 }
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37
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38 @SuppressWarnings("unchecked")
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39 public T set(CancelSupport cs) {
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40 cancelHelper = cs;
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41 return (T) this;
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42 }
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43
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44 // shall not return null
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45 protected ProgressSupport getProgressSupport(Object context) {
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46 if (progressHelper != null) {
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47 return progressHelper;
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48 }
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49 return ProgressSupport.Factory.get(context);
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50 }
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51
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52 // shall not return null if create is true
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53 // CancelSupport from context, if any, takes precedence
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54 protected CancelSupport getCancelSupport(Object context, boolean create) {
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55 CancelSupport rv = CancelSupport.Factory.get(context, null);
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56 if (rv != null) {
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57 return rv;
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58 }
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59 if (cancelHelper != null) {
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60 return cancelHelper;
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61 }
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62 if (create) {
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63 return CancelSupport.Factory.get(null);
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64 }
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65 return null;
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66 }
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67
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68 }