private <T extends OWLEntity> T createNew(String entityName, final Class<T> entityType)
throws OWLEntityCreationException {
String localName = getLocalName(entityName);
Optional<IRI> prefix = getPrefix(entityName);
IRI baseIri = prefix.orElseGet(() -> null);
return entityFactory.createOWLEntity(entityType, localName, baseIri).getOWLEntity();
}
@Test
public void testOptional() {
Optional<String> fullName = Optional.ofNullable(null);
Assert.assertEquals("Optional.empty", fullName.toString());
Assert.assertEquals("[none]", fullName.orElseGet(() -> "[none]"));
Assert.assertEquals("[none2]", fullName.orElse("[none2]"));
}
@Rank(Integer.MAX_VALUE)
@Singleton
@Override
public Client provide() {
if (!httpServer.isStarted()) {
throw new TestException("test server not started");
}
Object testInstance = testContext.getTestInstance();
Class<? extends Object> testClass = testInstance.getClass();
Optional<ClientConfig> optional =
of(testClass.getDeclaredMethods())
.filter(p -> p.getDeclaredAnnotation(Config.class) != null)
.filter(p -> p.getParameterCount() == 0)
.filter(p -> p.getReturnType().isAssignableFrom(ClientConfig.class))
.findFirst()
.map(p -> reflectionUtil.invokeMethod(testInstance, p))
.map(ClientConfig.class::cast);
ClientConfig clientConfig = optional.orElseGet(ClientConfig::new);
JerseyTest jerseyTest =
testContext.getTestInstance().getClass().getAnnotation(JerseyTest.class);
if (jerseyTest.logTraffic() && !clientConfig.isRegistered(LoggingFilter.class)) {
clientConfig.register(new LoggingFilter(log, jerseyTest.dumpEntity()));
}
return ClientBuilder.newClient(clientConfig);
}
static void optionalTest() {
// 不要这样,这与!=null没什么区别
Optional<String> stringOptional = Optional.of("alibaba");
if (stringOptional.isPresent()) {
System.out.println(stringOptional.get().length());
}
Optional<String> optionalValue = Optional.of("alibaba");
// 下面是推荐的常用操作
optionalValue.ifPresent(s -> System.out.println(s + " contains red"));
// 增加到集合汇总
List<String> results = Lists.newArrayList();
optionalValue.ifPresent(results::add);
// 增加到集合中，并返回操作结果
Optional<Boolean> added = optionalValue.map(results::add);
// 无值的optional
Optional<String> optionalString = Optional.empty();
// 不存在值，返回“No word”
String result = optionalValue.orElse("No word");
// 没值，计算一个默认值
result = optionalString.orElseGet(() -> System.getProperty("user.dir"));
// 无值，抛一个异常
try {
result = optionalString.orElseThrow(NoSuchElementException::new);
} catch (Throwable t) {
t.getCause();
}
}
@Test
public void _07_옵션_다루기() {
final Optional<String> optional = words.stream().filter(w -> w.contains("red")).findFirst();
try {
optional.ifPresent(
v -> {
throw new RuntimeException();
});
assert false; // 이 행은 실행되면 안됨.
} catch (RuntimeException e) {
}
// 비어있는 경우는 실행되지 않음.
Optional.empty()
.ifPresent(
v -> {
throw new RuntimeException();
});
Set<String> results = new HashSet<>();
optional.ifPresent(results::add);
assertThat(results.contains("tired"), is(true));
// 실행 결과를 받고 싶은 경우에는 map 사용.
results = new HashSet<>();
Optional<Boolean> added = optional.map(results::add);
assertThat(added, is(Optional.of(Boolean.TRUE)));
// 대상이 빈경우에는 empty Optional 반환
Optional<Boolean> a = Optional.empty().map(v -> true);
assertThat(a.isPresent(), is(false));
Optional<String> emptyOptional = Optional.empty();
// orElse로 기본값 지정 가능
String result = emptyOptional.orElse("기본값");
assertThat(result, is("기본값"));
// 기본값 생성하는 코드 호출 가능
result = emptyOptional.orElseGet(() -> System.getProperty("user.dir"));
assertThat(result, is(System.getProperty("user.dir")));
// 값이 없는 경우 예외 던지기
try {
emptyOptional.orElseThrow(NoSuchElementException::new);
assert false;
} catch (NoSuchElementException e) {
}
}
private void setCSSContextVariables(
IApplicationContext applicationContext, IEclipseContext context) {
boolean highContrastMode = getApplicationDisplay().getHighContrast();
Optional<String> cssURI =
highContrastMode
? Optional.empty()
: getArgValue(IWorkbench.CSS_URI_ARG, applicationContext, false);
cssURI.ifPresent(
cssURIValue -> {
context.set(IWorkbench.CSS_URI_ARG, cssURIValue);
});
Optional<String> themeId =
highContrastMode
? Optional.of(HIGH_CONTRAST_THEME_ID)
: getArgValue(E4Application.THEME_ID, applicationContext, false);
if (!themeId.isPresent() && !cssURI.isPresent()) {
context.set(E4Application.THEME_ID, DEFAULT_THEME_ID);
} else {
context.set(E4Application.THEME_ID, themeId.orElseGet(() -> null));
}
// validate static CSS URI
cssURI
.filter(cssURIValue -> !cssURIValue.startsWith("platform:/plugin/"))
.ifPresent(
cssURIValue -> {
System.err.println(
"Warning. Use the \"platform:/plugin/Bundle-SymbolicName/path/filename.extension\" URI for the parameter: "
+ IWorkbench.CSS_URI_ARG); // $NON-NLS-1$
context.set(E4Application.THEME_ID, cssURIValue);
});
Optional<String> cssResourcesURI =
getArgValue(IWorkbench.CSS_RESOURCE_URI_ARG, applicationContext, false);
cssResourcesURI.ifPresent(
cssResourcesURIValue -> {
context.set(IWorkbench.CSS_RESOURCE_URI_ARG, cssResourcesURIValue);
});
}
public ServerStorageImpl(
final String databaseId, final String tableName, final ChangeTrackerImpl changeTracker)
throws ServerStorageException {
this.databaseId = databaseId;
this.tableName = tableName;
this.changeTracker = changeTracker;
this.database.bind(FrameworkServiceImpl.getDatabasePoolService().requestConnection(databaseId));
final Optional<TableSchema> trySchema =
FrameworkServiceImpl.getConfigService()
.getActiveEnvironment()
.getDatabaseConfig(databaseId)
.schema()
.get()
.getSchemaOf(tableName);
// Estimate tables without provided schema
// Create empty schema
final TableSchema providedSchema =
trySchema.orElseGet(
() -> {
return new TableSchema() {
private final List<MappingMetaData> entries = Collections.emptyList();
@Override
public SchemaPolicy getPolicy() {
return SchemaPolicy.LAZY;
}
@Override
public String getStructure() {
return UnknownServerStorageStructure.class.getCanonicalName();
}
@Override
public String getName() {
return tableName;
}
@Override
public ClientStorageFormat getFormat() {
throw new UnsupportedOperationException();
}
@Override
public List<MappingMetaData> getEntries() {
return entries;
}
};
});
final TableSchema schema;
final Function<MappingMetaData, Optional<TypeToken<?>>> typeReceiver;
if (!providedSchema.getPolicy().hasPermissionToComplete()) {
schema = providedSchema;
typeReceiver = metaData -> Optional.empty();
} else {
final Pair<TableSchema, Function<MappingMetaData, Optional<TypeToken<?>>>> result =
estimateSchema(providedSchema);
schema = result.first();
typeReceiver = result.second();
}
this.structureName = schema.getStructure();
mapper =
new JsonMapper<>(
schema,
SQLToPropertyMappingAdapterHolder.<T>get(),
Arrays.asList(ServerStorageStructurePrivateBase.class),
ServerStorageStructureBaseImplementation.class,
typeReceiver);
statementObject =
tableName + PreparedStatements.STATEMENT_SELECT_ROW.toString() + (/*FIXME*/ INCREMENT++);
selectLowPart = createSelectFormat();
statementFormat = createStatementFormat();
this.database.addListener(
new ChangeListener<Database>() {
@Override
public void changed(
final ObservableValue<? extends Database> observable,
final Database oldValue,
final Database newValue) {
alive.unbind();
if (Objects.nonNull(newValue)) {
alive.bind(newValue.alive());
registerStatements();
} else alive.set(false);
}
});
registerStatements();
}
@Override
default Ty TmAbbBind(Term t, Optional<Ty> tyOpt) {
return tyOpt.orElseGet(() -> m().empty());
}
/**
* This routine implements the main operator lookup process. Each operator is tested using an
* applicability predicate; if the test suceeds that same operator is returned, otherwise a
* dummy symbol is returned.
*/
final Symbol doLookup(Predicate<Symbol> applicabilityTest) {
return Stream.of(alternatives.orElseGet(this::initOperators))
.filter(applicabilityTest)
.findFirst()
.orElse(syms.noSymbol);
}
