Example usage for com.google.common.base Optional of

Introduction

In this page you can find the example usage for com.google.common.base Optional of.

Prototype

public static <T> Optional<T> of(T reference)

Source Link

Document

Returns an Optional instance containing the given non-null reference.

Usage

From source file:com.shufudong.GuavaExample.collect.OptionalExample.java

/**
 * @return/*from  ww  w.  j ava 2 s. co m*/
 * @category <p>??</p>
 * <ol>
 * <li>Optional.of(T)Optional??nullT?T=null</li>
 * <li>Optional.absent()Optional?</li>
 * <li>Optional.fromNullable(T)T?OptionalT???[Optional.fromNullable(null)Optional.absent()</li>
 * </ol>
 * @throw
 */
public static void testOptional2() throws Exception {
    Optional<Integer> possible = Optional.of(6);
    Optional<Integer> absentOpt = Optional.absent();
    Optional<Integer> NullableOpt = Optional.fromNullable(null);
    Optional<Integer> NoNullableOpt = Optional.fromNullable(10);
    if (possible.isPresent()) {
        System.out.println("possible isPresent:" + possible.isPresent());
        System.out.println("possible value:" + possible.get());
    }
    if (absentOpt.isPresent()) {
        System.out.println("absentOpt isPresent:" + absentOpt.isPresent());
    }
    if (NullableOpt.isPresent()) {
        System.out.println("fromNullableOpt isPresent:" + NullableOpt.isPresent());
    }
    if (NoNullableOpt.isPresent()) {
        System.out.println("NoNullableOpt isPresent:" + NoNullableOpt.isPresent());
    }
}

From source file:dagger.internal.codegen.writer.FieldWriter.java

public void setInitializer(String initializer, Object... args) {
    this.initializer = Optional.of(Snippet.format(initializer, args));
}

From source file:org.opendaylight.netvirt.qosservice.UuidUtil.java

Optional<Uuid> newUuidIfValidPattern(String possibleUuid) {
    Preconditions.checkNotNull(possibleUuid, "possibleUuid == null");

    if (uuidPattern == null) {
        // Thread safe because it really doesn't matter even if we were to do this initialization more than once
        if (Uuid.PATTERN_CONSTANTS.size() != 1) {
            throw new IllegalStateException("Uuid.PATTERN_CONSTANTS.size() != 1");
        }/*  ww  w .java 2 s  . c o m*/
        uuidPattern = Pattern.compile(Uuid.PATTERN_CONSTANTS.get(0));
    }

    if (uuidPattern.matcher(possibleUuid).matches()) {
        return Optional.of(new Uuid(possibleUuid));
    } else {
        return Optional.absent();
    }
}

From source file:ezbake.ezbroadcast.core.InMemoryBroadcaster.java

@Override
protected Optional<byte[]> receiveImpl(String topic) throws IOException {
    return Optional.of(broadcasted.remove(topic));
}

From source file:info.rynkowski.hamsterclient.ui.AndroidApplication.java

private void initializeDependencyInjector() {
    this.applicationComponent = Optional
            .of(DaggerApplicationComponent.builder().applicationModule(new ApplicationModule(this)).build());
}

From source file:com.dangdang.ddframe.job.cloud.scheduler.ha.FrameworkIDService.java

/**
 * ?FrameworkID,?./*from   ww w  .  j a  v  a2s  . c om*/
 * 
 * @return ?FrameworkID?
 */
public Optional<String> fetch() {
    String frameworkId = regCenter.getDirectly(HANode.FRAMEWORK_ID_NODE);
    return Strings.isNullOrEmpty(frameworkId) ? Optional.<String>absent() : Optional.of(frameworkId);
}

From source file:org.eclipse.buildship.core.util.binding.Validators.java

public static Validator<File> optionalDirectoryValidator(final String prefix) {
    return new Validator<File>() {

        @Override/*from   w w  w  . ja  va  2  s. c om*/
        public Optional<String> validate(File file) {
            if (file == null) {
                return Optional.absent();
            } else if (!file.exists()) {
                return Optional.of(NLS.bind(CoreMessages.ErrorMessage_0_DoesNotExist, prefix));
            } else if (!file.isDirectory()) {
                return Optional.of(NLS.bind(CoreMessages.ErrorMessage_0_MustBeDirectory, prefix));
            } else {
                return Optional.absent();
            }
        }
    };
}

From source file:com.google.cloud.genomics.localrepo.BamFile.java

public static Optional<BamFile> create(File file) {
    return isReadableFile(file) && file.getName().endsWith(".bam") ? Optional.of(new BamFile(file))
            : Optional.<BamFile>absent();
}

From source file:io.crate.analyze.KillAnalyzedStatement.java

public KillAnalyzedStatement(UUID jobId) {
    this.jobId = Optional.of(jobId);
}

From source file:com.facebook.buck.android.ApkGenruleBuilder.java

public ApkGenruleBuilder setBash(String bash) {
    arg.bash = Optional.of(bash);
    return this;
}