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annotate src/org/tmatesoft/hg/util/CancelSupport.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents 9c9c442b5f2e
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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.util;
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19 /**
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20 * Mix-in for objects that support cancellation.
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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 CancelSupport {
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26
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27 /**
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28 * This method is invoked to check if target had been brought to canceled state. Shall silently return if target is
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29 * in regular state.
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30 * @throws CancelledException when target internal state has been changed to canceled.
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31 */
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32 void checkCancelled() throws CancelledException;
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34
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35 // Yeah, this factory class looks silly now, but perhaps in the future I'll need wrappers for other cancellation sources?
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36 // just don't want to have general Utils class with methods like get() below
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37 static class Factory {
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38
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39 /**
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40 * Obtain non-null cancel support object.
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41 *
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42 * @param target any object (or <code>null</code>) that might have cancel support. For <code>null</code>, returns an instance than never cancels.
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43 * @return target if it's capable checking cancellation status or no-op implementation that never cancels.
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44 */
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45 public static CancelSupport get(Object target) {
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46 CancelSupport cs = get(target, null);
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47 if (cs != null) {
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48 return cs;
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49 }
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50 class NoCancel implements CancelSupport {
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51 public void checkCancelled() {
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52 }
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53 };
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54 return new NoCancel();
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55 }
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57 public static CancelSupport get(Object target, CancelSupport defaultValue) {
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58 return Adaptable.Factory.getAdapter(target, CancelSupport.class, defaultValue);
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59 }
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60 }
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62 interface Target<T> {
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63 T set(CancelSupport cs);
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64 }
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65 }