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annotate src/org/tmatesoft/hg/internal/LifecycleProxy.java @ 520:1ee452f31187

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Experimental support for inverse direction history walking. Refactored/streamlined cancellation in HgLogCommand and down the stack
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 21 Dec 2012 21:20:26 +0100
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520
1ee452f31187 Experimental support for inverse direction history walking. Refactored/streamlined cancellation in HgLogCommand and down the stack
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1 /*
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2 * Copyright (c) 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.util.Adaptable;
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21 /**
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22 * Save callback and delegate to another lifecycle instance, if any
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23 *
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24 * @author Artem Tikhomirov
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25 * @author TMate Software Ltd.
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26 */
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27 public class LifecycleProxy implements Lifecycle {
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28
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29 private Callback lifecycleCallback;
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30 private Lifecycle target;
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31
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32 public LifecycleProxy() {
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33 }
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34
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35 public LifecycleProxy(Object delegate) {
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36 init(delegate);
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37 }
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39
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40 public void start(int count, Callback callback, Object token) {
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41 lifecycleCallback = callback;
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42 if (target != null) {
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43 target.start(count, callback, token);
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44 }
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45 }
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47 public void finish(Object token) {
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48 if (target != null) {
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49 target.finish(token);
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50 }
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51 lifecycleCallback = null;
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52 }
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54 public void init(Object delegate) {
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55 target = Adaptable.Factory.getAdapter(delegate, Lifecycle.class, null);
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56 }
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58 public void stop() {
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59 assert lifecycleCallback != null;
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60 if (lifecycleCallback != null) {
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61 lifecycleCallback.stop();
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62 }
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63 }
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64 }