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comparison src/org/tmatesoft/hg/util/CancelSupport.java @ 312:f9f3e9b67ccc

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Facilitate cancellation and progress reporting in changelog and manifest iterations
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 27 Sep 2011 05:29:12 +0200
parents 41a778e3fd31
children 91d75e1bac9f
comparison
equal deleted inserted replaced
311:b9592e21176a 312:f9f3e9b67ccc
41 * 41 *
42 * @param target any object (or <code>null</code>) that might have cancel support. For <code>null</code>, returns an instance than never cancels. 42 * @param target any object (or <code>null</code>) that might have cancel support. For <code>null</code>, returns an instance than never cancels.
43 * @return target if it's capable checking cancellation status or no-op implementation that never cancels. 43 * @return target if it's capable checking cancellation status or no-op implementation that never cancels.
44 */ 44 */
45 public static CancelSupport get(Object target) { 45 public static CancelSupport get(Object target) {
46 CancelSupport cs = get(target, null);
47 if (cs != null) {
48 return cs;
49 }
50 return new CancelSupport() {
51 public void checkCancelled() {
52 }
53 };
54 }
55
56 public static CancelSupport get(Object target, CancelSupport defaultValue) {
46 if (target instanceof CancelSupport) { 57 if (target instanceof CancelSupport) {
47 return (CancelSupport) target; 58 return (CancelSupport) target;
48 } 59 }
49 if (target instanceof Adaptable) { 60 if (target instanceof Adaptable) {
50 CancelSupport cs = ((Adaptable) target).getAdapter(CancelSupport.class); 61 CancelSupport cs = ((Adaptable) target).getAdapter(CancelSupport.class);
51 if (cs != null) { 62 if (cs != null) {
52 return cs; 63 return cs;
53 } 64 }
54 } 65 }
55 return new CancelSupport() { 66 return defaultValue;
56 public void checkCancelled() {
57 }
58 };
59 } 67 }
60 } 68 }
61 69
62 interface Target<T> { 70 interface Target<T> {
63 T set(CancelSupport cs); 71 T set(CancelSupport cs);