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annotate src/org/tmatesoft/hg/util/ProgressSupport.java @ 195:c9b305df0b89

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 15 Apr 2011 05:17:44 +0200
parents d5268ca7715b
children 41a778e3fd31
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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.util;
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18
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19 /**
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20 * Mix-in to report progress of a long-running operation
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21 *
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22 * @author Artem Tikhomirov
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23 * @author TMate Software Ltd.
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24 */
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25 public interface ProgressSupport {
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26
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27 public void start(long totalUnits);
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28 public void worked(int units);
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29 public void done();
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30
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31 static class Factory {
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32
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33 /**
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34 * @param target object that might be capable to report progress. Can be <code>null</code>
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35 * @return support object extracted from target or an empty, no-op implementation
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36 */
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37 public static ProgressSupport get(Object target) {
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38 if (target instanceof ProgressSupport) {
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39 return (ProgressSupport) target;
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40 }
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41 if (target instanceof Adaptable) {
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42 ProgressSupport ps = ((Adaptable) target).getAdapter(ProgressSupport.class);
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43 if (ps != null) {
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44 return ps;
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45 }
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46 }
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47 return new ProgressSupport() {
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48 public void start(long totalUnits) {
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49 }
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50 public void worked(int units) {
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51 }
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52 public void done() {
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53 }
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54 };
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55 }
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56 }
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57 }