-
-
Notifications
You must be signed in to change notification settings - Fork 1.5k
/
ExtensionContext.java
712 lines (660 loc) · 25.7 KB
/
ExtensionContext.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
/*
* Copyright 2015-2024 the original author or authors.
*
* All rights reserved. This program and the accompanying materials are
* made available under the terms of the Eclipse Public License v2.0 which
* accompanies this distribution and is available at
*
* https://www.eclipse.org/legal/epl-v20.html
*/
package org.junit.jupiter.api.extension;
import static org.apiguardian.api.API.Status.STABLE;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;
import org.apiguardian.api.API;
import org.junit.jupiter.api.TestInstance.Lifecycle;
import org.junit.jupiter.api.parallel.ExecutionMode;
import org.junit.platform.commons.PreconditionViolationException;
import org.junit.platform.commons.support.ReflectionSupport;
import org.junit.platform.commons.util.Preconditions;
/**
* {@code ExtensionContext} encapsulates the <em>context</em> in which the
* current test or container is being executed.
*
* <p>{@link Extension Extensions} are provided an instance of
* {@code ExtensionContext} to perform their work.
*
* @since 5.0
* @see Store
* @see Namespace
*/
@API(status = STABLE, since = "5.0")
public interface ExtensionContext {
/**
* Get the parent extension context, if available.
*
* @return an {@code Optional} containing the parent; never {@code null} but
* potentially empty
* @see #getRoot()
*/
Optional<ExtensionContext> getParent();
/**
* Get the <em>root</em> {@code ExtensionContext}.
*
* @return the root extension context; never {@code null} but potentially
* <em>this</em> {@code ExtensionContext}
* @see #getParent()
*/
ExtensionContext getRoot();
/**
* Get the unique ID of the current test or container.
*
* @return the unique ID of the test or container; never {@code null} or blank
*/
String getUniqueId();
/**
* Get the display name for the current test or container.
*
* <p>The display name is either a default name or a custom name configured
* via {@link org.junit.jupiter.api.DisplayName @DisplayName}.
*
* <p>For details on default display names consult the Javadoc for
* {@link org.junit.jupiter.api.TestInfo#getDisplayName()}.
*
* <p>Note that display names are typically used for test reporting in IDEs
* and build tools and may contain spaces, special characters, and even emoji.
*
* @return the display name of the test or container; never {@code null} or blank
*/
String getDisplayName();
/**
* Get the set of all tags for the current test or container.
*
* <p>Tags may be declared directly on the test element or <em>inherited</em>
* from an outer context.
*
* @return the set of tags for the test or container; never {@code null} but
* potentially empty
*/
Set<String> getTags();
/**
* Get the {@link AnnotatedElement} corresponding to the current extension
* context, if available.
*
* <p>For example, if the current extension context encapsulates a test
* class, test method, test factory method, or test template method, the
* annotated element will be the corresponding {@link Class} or {@link Method}
* reference.
*
* <p>Favor this method over more specific methods whenever the
* {@code AnnotatedElement} API suits the task at hand — for example,
* when looking up annotations regardless of concrete element type.
*
* @return an {@code Optional} containing the {@code AnnotatedElement};
* never {@code null} but potentially empty
* @see #getTestClass()
* @see #getTestMethod()
*/
Optional<AnnotatedElement> getElement();
/**
* Get the {@link Class} associated with the current test or container,
* if available.
*
* @return an {@code Optional} containing the class; never {@code null} but
* potentially empty
* @see #getRequiredTestClass()
*/
Optional<Class<?>> getTestClass();
/**
* Get the <em>required</em> {@link Class} associated with the current test
* or container.
*
* <p>Use this method as an alternative to {@link #getTestClass()} for use
* cases in which the test class is required to be present.
*
* @return the test class; never {@code null}
* @throws PreconditionViolationException if the test class is not present
* in this {@code ExtensionContext}
*/
default Class<?> getRequiredTestClass() {
return Preconditions.notNull(getTestClass().orElse(null),
"Illegal state: required test class is not present in the current ExtensionContext");
}
/**
* Get the {@link Lifecycle} of the {@linkplain #getTestInstance() test
* instance} associated with the current test or container, if available.
*
* @return an {@code Optional} containing the test instance {@code Lifecycle};
* never {@code null} but potentially empty
* @since 5.1
* @see org.junit.jupiter.api.TestInstance {@code @TestInstance}
*/
@API(status = STABLE, since = "5.1")
Optional<Lifecycle> getTestInstanceLifecycle();
/**
* Get the test instance associated with the current test or container,
* if available.
*
* @return an {@code Optional} containing the test instance; never
* {@code null} but potentially empty
* @see #getRequiredTestInstance()
* @see #getTestInstances()
*/
Optional<Object> getTestInstance();
/**
* Get the <em>required</em> test instance associated with the current test
* or container.
*
* <p>Use this method as an alternative to {@link #getTestInstance()} for use
* cases in which the test instance is required to be present.
*
* @return the test instance; never {@code null}
* @throws PreconditionViolationException if the test instance is not present
* in this {@code ExtensionContext}
*
* @see #getRequiredTestInstances()
*/
default Object getRequiredTestInstance() {
return Preconditions.notNull(getTestInstance().orElse(null),
"Illegal state: required test instance is not present in the current ExtensionContext");
}
/**
* Get the test instances associated with the current test or container,
* if available.
*
* <p>While top-level tests only have a single test instance, nested tests
* have one additional instance for each enclosing test class.
*
* @return an {@code Optional} containing the test instances; never
* {@code null} but potentially empty
* @since 5.4
* @see #getRequiredTestInstances()
*/
@API(status = STABLE, since = "5.7")
Optional<TestInstances> getTestInstances();
/**
* Get the <em>required</em> test instances associated with the current test
* or container.
*
* <p>Use this method as an alternative to {@link #getTestInstances()} for use
* cases in which the test instances are required to be present.
*
* @return the test instances; never {@code null}
* @throws PreconditionViolationException if the test instances are not present
* in this {@code ExtensionContext}
* @since 5.4
*/
@API(status = STABLE, since = "5.7")
default TestInstances getRequiredTestInstances() {
return Preconditions.notNull(getTestInstances().orElse(null),
"Illegal state: required test instances are not present in the current ExtensionContext");
}
/**
* Get the {@link Method} associated with the current test, if available.
*
* @return an {@code Optional} containing the method; never {@code null} but
* potentially empty
* @see #getRequiredTestMethod()
*/
Optional<Method> getTestMethod();
/**
* Get the <em>required</em> {@link Method} associated with the current test
* or container.
*
* <p>Use this method as an alternative to {@link #getTestMethod()} for use
* cases in which the test method is required to be present.
*
* @return the test method; never {@code null}
* @throws PreconditionViolationException if the test method is not present
* in this {@code ExtensionContext}
*/
default Method getRequiredTestMethod() {
return Preconditions.notNull(getTestMethod().orElse(null),
"Illegal state: required test method is not present in the current ExtensionContext");
}
/**
* Get the exception that was thrown during execution of the test or container
* associated with this {@code ExtensionContext}, if available.
*
* <p>This method is typically used for logging and tracing purposes. If you
* wish to actually <em>handle</em> an exception thrown during test execution,
* implement the {@link TestExecutionExceptionHandler} API.
*
* <p>Unlike the exception passed to a {@code TestExecutionExceptionHandler},
* an <em>execution exception</em> returned by this method can be any
* exception thrown during the invocation of a {@code @Test} method, its
* surrounding {@code @BeforeEach} and {@code @AfterEach} methods, or a
* test-level {@link Extension}. Similarly, if this {@code ExtensionContext}
* represents a test class, the <em>execution exception</em> returned by
* this method can be any exception thrown in a {@code @BeforeAll} or
* {@code AfterAll} method or a class-level {@link Extension}.
*
* <p>Note, however, that this method will never return an exception
* swallowed by a {@code TestExecutionExceptionHandler}. Furthermore, if
* multiple exceptions have been thrown during test execution, the exception
* returned by this method will be the first such exception with all
* additional exceptions {@linkplain Throwable#addSuppressed(Throwable)
* suppressed} in the first one.
*
* @return an {@code Optional} containing the exception thrown; never
* {@code null} but potentially empty if test execution has not (yet)
* resulted in an exception
*/
Optional<Throwable> getExecutionException();
/**
* Get the configuration parameter stored under the specified {@code key}.
*
* <p>If no such key is present in the {@code ConfigurationParameters} for
* the JUnit Platform, an attempt will be made to look up the value as a
* JVM system property. If no such system property exists, an attempt will
* be made to look up the value in the JUnit Platform properties file.
*
* @param key the key to look up; never {@code null} or blank
* @return an {@code Optional} containing the value; never {@code null}
* but potentially empty
*
* @since 5.1
* @see System#getProperty(String)
* @see org.junit.platform.engine.ConfigurationParameters
*/
@API(status = STABLE, since = "5.1")
Optional<String> getConfigurationParameter(String key);
/**
* Get and transform the configuration parameter stored under the specified
* {@code key} using the specified {@code transformer}.
*
* <p>If no such key is present in the {@code ConfigurationParameters} for
* the JUnit Platform, an attempt will be made to look up the value as a
* JVM system property. If no such system property exists, an attempt will
* be made to look up the value in the JUnit Platform properties file.
*
* <p>In case the transformer throws an exception, it will be wrapped in a
* {@link org.junit.platform.commons.JUnitException} with a helpful message.
*
* @param key the key to look up; never {@code null} or blank
* @param transformer the transformer to apply in case a value is found;
* never {@code null}
* @return an {@code Optional} containing the value; never {@code null}
* but potentially empty
*
* @since 5.7
* @see System#getProperty(String)
* @see org.junit.platform.engine.ConfigurationParameters
*/
@API(status = STABLE, since = "5.10")
<T> Optional<T> getConfigurationParameter(String key, Function<String, T> transformer);
/**
* Publish a map of key-value pairs to be consumed by an
* {@code org.junit.platform.engine.EngineExecutionListener} in order to
* supply additional information to the reporting infrastructure.
*
* @param map the key-value pairs to be published; never {@code null};
* keys and values within entries in the map also must not be
* {@code null} or blank
* @see #publishReportEntry(String, String)
* @see #publishReportEntry(String)
* @see org.junit.platform.engine.EngineExecutionListener#reportingEntryPublished
*/
void publishReportEntry(Map<String, String> map);
/**
* Publish the specified key-value pair to be consumed by an
* {@code org.junit.platform.engine.EngineExecutionListener} in order to
* supply additional information to the reporting infrastructure.
*
* @param key the key of the published pair; never {@code null} or blank
* @param value the value of the published pair; never {@code null} or blank
* @see #publishReportEntry(Map)
* @see #publishReportEntry(String)
* @see org.junit.platform.engine.EngineExecutionListener#reportingEntryPublished
*/
default void publishReportEntry(String key, String value) {
this.publishReportEntry(Collections.singletonMap(key, value));
}
/**
* Publish the specified value to be consumed by an
* {@code org.junit.platform.engine.EngineExecutionListener} in order to
* supply additional information to the reporting infrastructure.
*
* <p>This method delegates to {@link #publishReportEntry(String, String)},
* supplying {@code "value"} as the key and the supplied {@code value}
* argument as the value.
*
* @param value the value to be published; never {@code null} or blank
* @since 5.3
* @see #publishReportEntry(Map)
* @see #publishReportEntry(String, String)
* @see org.junit.platform.engine.EngineExecutionListener#reportingEntryPublished
*/
@API(status = STABLE, since = "5.3")
default void publishReportEntry(String value) {
this.publishReportEntry("value", value);
}
/**
* Get the {@link Store} for the supplied {@link Namespace}.
*
* <p>Use {@code getStore(Namespace.GLOBAL)} to get the default, global {@link Namespace}.
*
* <p>A store is bound to its extension context lifecycle. When an extension
* context lifecycle ends it closes its associated store. All stored values
* that are instances of {@link ExtensionContext.Store.CloseableResource} are
* notified by invoking their {@code close()} methods.
*
* @param namespace the {@code Namespace} to get the store for; never {@code null}
* @return the store in which to put and get objects for other invocations
* working in the same namespace; never {@code null}
* @see Namespace#GLOBAL
*/
Store getStore(Namespace namespace);
/**
* Get the {@link ExecutionMode} associated with the current test or container.
*
* @return the {@code ExecutionMode} of the test; never {@code null}
*
* @since 5.8.1
* @see org.junit.jupiter.api.parallel.ExecutionMode {@code @ExecutionMode}
*/
@API(status = STABLE, since = "5.8.1")
ExecutionMode getExecutionMode();
/**
* Get an {@link ExecutableInvoker} to invoke methods and constructors
* with support for dynamic resolution of parameters.
*
* @since 5.9
*/
@API(status = STABLE, since = "5.11")
ExecutableInvoker getExecutableInvoker();
/**
* {@code Store} provides methods for extensions to save and retrieve data.
*/
interface Store {
/**
* Classes implementing this interface indicate that they want to {@link #close}
* some underlying resource or resources when the enclosing {@link Store Store}
* is closed.
*
* <p>Note that the {@code CloseableResource} API is only honored for
* objects stored within an extension context {@link Store Store}.
*
* <p>The resources stored in a {@link Store Store} are closed in the
* inverse order they were added in.
*
* @since 5.1
*/
@API(status = STABLE, since = "5.1")
interface CloseableResource {
/**
* Close underlying resources.
*
* @throws Throwable any throwable will be caught and rethrown
*/
void close() throws Throwable;
}
/**
* Get the value that is stored under the supplied {@code key}.
*
* <p>If no value is stored in the current {@link ExtensionContext}
* for the supplied {@code key}, ancestors of the context will be queried
* for a value with the same {@code key} in the {@code Namespace} used
* to create this store.
*
* <p>For greater type safety, consider using {@link #get(Object, Class)}
* instead.
*
* @param key the key; never {@code null}
* @return the value; potentially {@code null}
* @see #get(Object, Class)
* @see #getOrDefault(Object, Class, Object)
*/
Object get(Object key);
/**
* Get the value of the specified required type that is stored under
* the supplied {@code key}.
*
* <p>If no value is stored in the current {@link ExtensionContext}
* for the supplied {@code key}, ancestors of the context will be queried
* for a value with the same {@code key} in the {@code Namespace} used
* to create this store.
*
* @param key the key; never {@code null}
* @param requiredType the required type of the value; never {@code null}
* @param <V> the value type
* @return the value; potentially {@code null}
* @see #get(Object)
* @see #getOrDefault(Object, Class, Object)
*/
<V> V get(Object key, Class<V> requiredType);
/**
* Get the value of the specified required type that is stored under
* the supplied {@code key}, or the supplied {@code defaultValue} if no
* value is found for the supplied {@code key} in this store or in an
* ancestor.
*
* <p>If no value is stored in the current {@link ExtensionContext}
* for the supplied {@code key}, ancestors of the context will be queried
* for a value with the same {@code key} in the {@code Namespace} used
* to create this store.
*
* @param key the key; never {@code null}
* @param requiredType the required type of the value; never {@code null}
* @param defaultValue the default value
* @param <V> the value type
* @return the value; potentially {@code null}
* @since 5.5
* @see #get(Object, Class)
*/
@API(status = STABLE, since = "5.5")
default <V> V getOrDefault(Object key, Class<V> requiredType, V defaultValue) {
V value = get(key, requiredType);
return (value != null ? value : defaultValue);
}
/**
* Get the object of type {@code type} that is present in this
* {@code Store} (<em>keyed</em> by {@code type}); and otherwise invoke
* the default constructor for {@code type} to generate the object,
* store it, and return it.
*
* <p>This method is a shortcut for the following, where {@code X} is
* the type of object we wish to retrieve from the store.
*
* <pre style="code">
* X x = store.getOrComputeIfAbsent(X.class, key -> new X(), X.class);
* // Equivalent to:
* // X x = store.getOrComputeIfAbsent(X.class);
* </pre>
*
* <p>See {@link #getOrComputeIfAbsent(Object, Function, Class)} for
* further details.
*
* <p>If {@code type} implements {@link ExtensionContext.Store.CloseableResource}
* the {@code close()} method will be invoked on the stored object when
* the store is closed.
*
* @param type the type of object to retrieve; never {@code null}
* @param <V> the key and value type
* @return the object; never {@code null}
* @since 5.1
* @see #getOrComputeIfAbsent(Object, Function)
* @see #getOrComputeIfAbsent(Object, Function, Class)
* @see CloseableResource
*/
@API(status = STABLE, since = "5.1")
default <V> V getOrComputeIfAbsent(Class<V> type) {
return getOrComputeIfAbsent(type, ReflectionSupport::newInstance, type);
}
/**
* Get the value that is stored under the supplied {@code key}.
*
* <p>If no value is stored in the current {@link ExtensionContext}
* for the supplied {@code key}, ancestors of the context will be queried
* for a value with the same {@code key} in the {@code Namespace} used
* to create this store. If no value is found for the supplied {@code key},
* a new value will be computed by the {@code defaultCreator} (given
* the {@code key} as input), stored, and returned.
*
* <p>For greater type safety, consider using
* {@link #getOrComputeIfAbsent(Object, Function, Class)} instead.
*
* <p>If the created value is an instance of {@link ExtensionContext.Store.CloseableResource}
* the {@code close()} method will be invoked on the stored object when
* the store is closed.
*
* @param key the key; never {@code null}
* @param defaultCreator the function called with the supplied {@code key}
* to create a new value; never {@code null} but may return {@code null}
* @param <K> the key type
* @param <V> the value type
* @return the value; potentially {@code null}
* @see #getOrComputeIfAbsent(Class)
* @see #getOrComputeIfAbsent(Object, Function, Class)
* @see CloseableResource
*/
<K, V> Object getOrComputeIfAbsent(K key, Function<K, V> defaultCreator);
/**
* Get the value of the specified required type that is stored under the
* supplied {@code key}.
*
* <p>If no value is stored in the current {@link ExtensionContext}
* for the supplied {@code key}, ancestors of the context will be queried
* for a value with the same {@code key} in the {@code Namespace} used
* to create this store. If no value is found for the supplied {@code key},
* a new value will be computed by the {@code defaultCreator} (given
* the {@code key} as input), stored, and returned.
*
* <p>If {@code requiredType} implements {@link ExtensionContext.Store.CloseableResource}
* the {@code close()} method will be invoked on the stored object when
* the store is closed.
*
* @param key the key; never {@code null}
* @param defaultCreator the function called with the supplied {@code key}
* to create a new value; never {@code null} but may return {@code null}
* @param requiredType the required type of the value; never {@code null}
* @param <K> the key type
* @param <V> the value type
* @return the value; potentially {@code null}
* @see #getOrComputeIfAbsent(Class)
* @see #getOrComputeIfAbsent(Object, Function)
* @see CloseableResource
*/
<K, V> V getOrComputeIfAbsent(K key, Function<K, V> defaultCreator, Class<V> requiredType);
/**
* Store a {@code value} for later retrieval under the supplied {@code key}.
*
* <p>A stored {@code value} is visible in child {@link ExtensionContext
* ExtensionContexts} for the store's {@code Namespace} unless they
* overwrite it.
*
* <p>If the {@code value} is an instance of {@link ExtensionContext.Store.CloseableResource}
* the {@code close()} method will be invoked on the stored object when
* the store is closed.
*
* @param key the key under which the value should be stored; never
* {@code null}
* @param value the value to store; may be {@code null}
* @see CloseableResource
*/
void put(Object key, Object value);
/**
* Remove the value that was previously stored under the supplied {@code key}.
*
* <p>The value will only be removed in the current {@link ExtensionContext},
* not in ancestors. In addition, the {@link CloseableResource} API will not
* be honored for values that are manually removed via this method.
*
* <p>For greater type safety, consider using {@link #remove(Object, Class)}
* instead.
*
* @param key the key; never {@code null}
* @return the previous value or {@code null} if no value was present
* for the specified key
* @see #remove(Object, Class)
*/
Object remove(Object key);
/**
* Remove the value of the specified required type that was previously stored
* under the supplied {@code key}.
*
* <p>The value will only be removed in the current {@link ExtensionContext},
* not in ancestors. In addition, the {@link CloseableResource} API will not
* be honored for values that are manually removed via this method.
*
* @param key the key; never {@code null}
* @param requiredType the required type of the value; never {@code null}
* @param <V> the value type
* @return the previous value or {@code null} if no value was present
* for the specified key
* @see #remove(Object)
*/
<V> V remove(Object key, Class<V> requiredType);
}
/**
* A {@code Namespace} is used to provide a <em>scope</em> for data saved by
* extensions within a {@link Store}.
*
* <p>Storing data in custom namespaces allows extensions to avoid accidentally
* mixing data between extensions or across different invocations within the
* lifecycle of a single extension.
*/
class Namespace {
/**
* The default, global namespace which allows access to stored data from
* all extensions.
*/
public static final Namespace GLOBAL = Namespace.create(new Object());
/**
* Create a namespace which restricts access to data to all extensions
* which use the same sequence of {@code parts} for creating a namespace.
*
* <p>The order of the {@code parts} is significant.
*
* <p>Internally the {@code parts} are compared using {@link Object#equals(Object)}.
*/
public static Namespace create(Object... parts) {
Preconditions.notEmpty(parts, "parts array must not be null or empty");
Preconditions.containsNoNullElements(parts, "individual parts must not be null");
return new Namespace(new ArrayList<>(Arrays.asList(parts)));
}
private final List<Object> parts;
private Namespace(List<Object> parts) {
this.parts = parts;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Namespace that = (Namespace) o;
return this.parts.equals(that.parts);
}
@Override
public int hashCode() {
return this.parts.hashCode();
}
/**
* Create a new namespace by appending the supplied {@code parts} to the
* existing sequence of parts in this namespace.
*
* @return new namespace; never {@code null}
* @since 5.8
*/
@API(status = STABLE, since = "5.10")
public Namespace append(Object... parts) {
Preconditions.notEmpty(parts, "parts array must not be null or empty");
Preconditions.containsNoNullElements(parts, "individual parts must not be null");
ArrayList<Object> newParts = new ArrayList<>(this.parts.size() + parts.length);
newParts.addAll(this.parts);
Collections.addAll(newParts, parts);
return new Namespace(newParts);
}
}
}