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comparison src/org/tmatesoft/hg/internal/AdapterPlug.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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children 90df078d6418
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519:934037edbea0 520:1ee452f31187
1 /*
2 * Copyright (c) 2012 TMate Software Ltd
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * For information on how to redistribute this software under
14 * the terms of a license other than GNU General Public License
15 * contact TMate Software at support@hg4j.com
16 */
17 package org.tmatesoft.hg.internal;
18
19 import java.util.ArrayList;
20 import java.util.HashMap;
21 import java.util.List;
22 import java.util.Map;
23
24 import org.tmatesoft.hg.util.Adaptable;
25
26 /**
27 * Implementation of {@link Adaptable} that allows to add ("plug")
28 * adapters as needed
29 *
30 * @author Artem Tikhomirov
31 * @author TMate Software Ltd.
32 */
33 public class AdapterPlug implements Adaptable {
34 private final Map<Class<?>, Object> adapters = new HashMap<Class<?>, Object>();
35 private final List<Class<?>> adapterUses = new ArrayList<Class<?>>();
36
37 public <T> void attachAdapter(Class<T> adapterClass, T instance) {
38 adapters.put(adapterClass, instance);
39 }
40
41 public <T> T getAdapter(Class<T> adapterClass) {
42 Object instance = adapters.get(adapterClass);
43 if (instance != null) {
44 adapterUses.add(adapterClass);
45 return adapterClass.cast(instance);
46 }
47 return null;
48 }
49
50 public int getAdapterUse(Class<?> adapterClass) {
51 int uses = 0;
52 for (Class<?> c : adapterUses) {
53 if (c == adapterClass) {
54 uses++;
55 }
56 }
57 return uses;
58 }
59 }