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

Introduction

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

Prototype

public static <T> Optional<T> absent()

Source Link

Document

Returns an Optional instance with no contained reference.

Usage

From source file:manifestor.util.ManifestUtil.java

public final static Optional<Map<String, String>> readManifestFromInputStream(final InputStream inputStream) {
    try {//  w  ww  . ja  va2 s  .  c o  m
        final Map<String, String> manifestMap = ManifestUtil.load(inputStream);
        return Optional.of(manifestMap);
    } catch (IOException ioex) {
        logger.error("Failed to fetch manifest details", ioex);
    }

    return Optional.absent();
}

From source file:org.eclipse.mylyn.internal.wikitext.commonmark.inlines.StringCharactersSpan.java

@Override
public Optional<? extends Inline> createInline(Cursor cursor) {
    Matcher matcher = cursor.matcher(pattern);
    if (matcher.matches()) {
        String group = matcher.group(1);
        int length = cursor.getOffset(matcher.end(1)) - cursor.getOffset();
        return Optional.of(new Characters(cursor.getLineAtOffset(), cursor.getOffset(), length, group));
    }//from  w w w  .j a  v a2 s  .co  m
    return Optional.absent();
}

From source file:org.opendaylight.controller.netconf.confignetconfconnector.mapping.attributes.mapping.ArrayAttributeMappingStrategy.java

@Override
public Optional<List<Object>> mapAttribute(Object value) {
    if (value == null) {
        return Optional.absent();
    }// w  ww.  ja va2s .c om

    Preconditions.checkArgument(value.getClass().isArray(), "Value has to be instanceof Array ");

    List<Object> retVal = Lists.newArrayList();

    for (int i = 0; i < Array.getLength(value); i++) {
        Object innerValue = Array.get(value, i);
        Optional<?> mapAttribute = innerElementStrategy.mapAttribute(innerValue);

        if (mapAttribute.isPresent()) {
            retVal.add(mapAttribute.get());
        }
    }

    return Optional.of(retVal);
}

From source file:org.apache.aurora.scheduler.filter.ConstraintMatcher.java

/**
 * Gets the veto (if any) for a scheduling constraint based on the {@link AttributeAggregate} this
 * filter was created with./* www .j  a  v a 2  s  .  co m*/
 *
 * @param constraint Scheduling filter to check.
 * @return A veto if the constraint is not satisfied based on the existing state of the job.
 */
static Optional<Veto> getVeto(AttributeAggregate cachedjobState, Iterable<IAttribute> hostAttributes,
        IConstraint constraint) {

    Iterable<IAttribute> sameNameAttributes = Iterables.filter(hostAttributes,
            new NameFilter(constraint.getName()));
    Optional<IAttribute> attribute;
    if (Iterables.isEmpty(sameNameAttributes)) {
        attribute = Optional.absent();
    } else {
        Set<String> attributeValues = ImmutableSet
                .copyOf(Iterables.concat(Iterables.transform(sameNameAttributes, GET_VALUES)));
        attribute = Optional.of(IAttribute.build(new Attribute(constraint.getName(), attributeValues)));
    }

    ITaskConstraint taskConstraint = constraint.getConstraint();
    switch (taskConstraint.getSetField()) {
    case VALUE:
        boolean matches = AttributeFilter.matches(attribute.transform(GET_VALUES).or(ImmutableSet.of()),
                taskConstraint.getValue());
        return matches ? Optional.absent() : Optional.of(Veto.constraintMismatch(constraint.getName()));

    case LIMIT:
        if (!attribute.isPresent()) {
            return Optional.of(Veto.constraintMismatch(constraint.getName()));
        }

        boolean satisfied = AttributeFilter.matches(attribute.get(), taskConstraint.getLimit().getLimit(),
                cachedjobState);
        return satisfied ? Optional.absent() : Optional.of(Veto.unsatisfiedLimit(constraint.getName()));

    default:
        throw new SchedulerException(
                "Failed to recognize the constraint type: " + taskConstraint.getSetField());
    }
}

From source file:com.stepstone.sonar.plugin.coldfusion.cflint.xml.LocationAttributes.java

public LocationAttributes(XMLStreamReader stream) {
    file = getAttributeValue("file", stream);
    message = getAttributeValue("message", stream);

    Optional<String> line = getAttributeValue("line", stream);

    if (line.isPresent()) {
        this.line = Optional.of(Integer.parseInt(line.get()));
    } else {/*from w w  w . j a v  a  2  s .c o  m*/
        this.line = Optional.absent();
    }
}

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

public KillAnalyzedStatement() {
    jobId = Optional.absent();
}

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

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

        @Override/*  w  ww.j ava 2s  .  co m*/
        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:retrofit.processor.GwtCompatibility.java

GwtCompatibility(TypeElement type) {
    Optional<AnnotationMirror> gwtCompatibleAnnotation = Optional.absent();
    List<? extends AnnotationMirror> annotations = type.getAnnotationMirrors();
    for (AnnotationMirror annotation : annotations) {
        Name name = annotation.getAnnotationType().asElement().getSimpleName();
        if (name.contentEquals("GwtCompatible")) {
            gwtCompatibleAnnotation = Optional.of(annotation);
        }/*from w  w w.  j  av  a 2 s.  c o  m*/
    }
    this.gwtCompatibleAnnotation = gwtCompatibleAnnotation;
}

From source file:org.opendaylight.controller.config.facade.xml.mapping.attributes.mapping.ObjectNameAttributeMappingStrategy.java

@Override
public Optional<MappedDependency> mapAttribute(Object value) {
    if (value == null) {
        return Optional.absent();
    }/*from   w  w  w .  ja v a 2s  .  c o  m*/

    String expectedClass = getOpenType().getClassName();
    String realClass = value.getClass().getName();
    Preconditions.checkArgument(realClass.equals(expectedClass),
            "Type mismatch, expected " + expectedClass + " but was " + realClass);
    Util.checkType(value, ObjectName.class);

    ObjectName on = (ObjectName) value;

    String refName = ObjectNameUtil.getReferenceName(on);

    //we want to use the exact service name that was configured in xml so services that are referencing it can be resolved
    return Optional.of(new MappedDependency(namespace,
            QName.create(ObjectNameUtil.getServiceQName(on)).getLocalName(), refName));
}

From source file:io.crate.sql.tree.AllColumns.java

public AllColumns() {
    prefix = Optional.absent();
}