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annotate src/org/tmatesoft/hg/util/Adaptable.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 91d75e1bac9f
children
rev   line source
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1 /*
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2 * Copyright (c) 2011 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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18
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19 /**
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20 * Extension mechanism.
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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 Adaptable {
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26
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27 <T> T getAdapter(Class<T> adapterClass);
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29 class Factory<T> {
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31 private final Class<T> adapterClass;
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32
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33 public Factory(Class<T> adapterClass) {
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34 assert adapterClass != null;
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35 this.adapterClass = adapterClass;
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36 }
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37
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38 public T get(Object target) {
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39 return getAdapter(target, adapterClass, null);
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40 }
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42 public T get(Object target, T defaultValue) {
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43 return getAdapter(target, adapterClass, defaultValue);
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44 }
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45
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46 /**
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47 * Try to adapt target to specified class, resort to defaultValue when not possible.
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48 * Instance lookup order is as follows: first, target is checked for being {@link Adaptable} and, if yes,
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49 * consulted for adapter. Then, plain {@link Class#isInstance(Object) instanceof} checks if target itself is
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50 * of desired type. {@link Adaptable} check comes first to allow classed that are in fact <code>instanceof</code>
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51 * desired type to respond to the demand conditionally
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52 *
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53 * @param target object to adapt, <code>null</code> value, although meaningless, is tolerable.
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54 * @param adapterClass desired target class
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55 * @param defaultValue value to use if target cannot be adapted to desired class, may be <code>null</code>
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56 * @return instance of the desired class
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57 */
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58 public static <C> C getAdapter(Object target, Class<C> adapterClass, C defaultValue) {
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59 if (target instanceof Adaptable) {
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60 return ((Adaptable) target).getAdapter(adapterClass);
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61 }
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62 if (adapterClass.isInstance(target)) {
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63 return adapterClass.cast(target);
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64 }
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65 return defaultValue;
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66 }
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67 }
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68 }