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annotate src/org/tmatesoft/hg/internal/IterateControlMediator.java @ 599:55b7987c1796

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Do not instantiate intermediate arrays
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 03 May 2013 15:29:26 +0200
parents 1ee452f31187
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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.internal;
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19 import org.tmatesoft.hg.internal.Lifecycle.Callback;
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20 import org.tmatesoft.hg.util.CancelSupport;
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21 import org.tmatesoft.hg.util.CancelledException;
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22
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23 /**
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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 public class IterateControlMediator {
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30 private final CancelSupport src;
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31 private final Callback receiver;
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32 private CancelledException cancellation;
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34 public IterateControlMediator(CancelSupport source, Lifecycle.Callback target) {
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35 assert target != null;
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36 src = source;
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37 receiver = target;
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38 }
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40 public boolean checkCancelled() {
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41 if (src == null) {
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42 return false;
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43 }
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44 if (cancellation != null) {
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45 return true;
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46 }
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47 try {
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48 src.checkCancelled();
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49 return false;
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50 } catch (CancelledException ex) {
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51 receiver.stop();
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52 cancellation = ex;
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53 return true;
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54 }
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55 }
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57 public void stop() {
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58 receiver.stop();
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59 }
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61 public CancelledException getCancelException() {
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62 return cancellation;
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63 }
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64 }