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annotate src/org/tmatesoft/hg/internal/AdapterPlug.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 90df078d6418
children
rev   line source
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1 /*
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2 * Copyright (c) 2012-2013 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 java.util.ArrayList;
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20 import java.util.HashMap;
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21 import java.util.List;
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22 import java.util.Map;
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24 import org.tmatesoft.hg.util.Adaptable;
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26 /**
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27 * Implementation of {@link Adaptable} that allows to add ("plug")
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28 * adapters as needed
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29 *
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30 * @author Artem Tikhomirov
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31 * @author TMate Software Ltd.
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32 */
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33 public class AdapterPlug implements Adaptable {
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34 private final Map<Class<?>, Object> adapters = new HashMap<Class<?>, Object>();
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35 private final List<Class<?>> adapterUses = new ArrayList<Class<?>>();
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37 public <T> void attachAdapter(Class<T> adapterClass, T instance) {
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38 adapters.put(adapterClass, instance);
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39 }
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41 @SuppressWarnings("unchecked")
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42 public <T> T detachAdapter(Class<T> adapterClass) {
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43 return (T) adapters.remove(adapterClass);
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44 }
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46 public <T> T getAdapter(Class<T> adapterClass) {
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47 Object instance = adapters.get(adapterClass);
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48 if (instance != null) {
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49 adapterUses.add(adapterClass);
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50 return adapterClass.cast(instance);
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51 }
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52 return null;
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53 }
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55 public int getAdapterUse(Class<?> adapterClass) {
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56 int uses = 0;
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57 for (Class<?> c : adapterUses) {
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58 if (c == adapterClass) {
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59 uses++;
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60 }
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61 }
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62 return uses;
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63 }
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64 }