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

List of usage examples for com.google.common.base Optional transform

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Introduction

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

Prototype

public abstract <V> Optional<V> transform(Function<? super T, V> function);

Source Link

Document

If the instance is present, it is transformed with the given Function ; otherwise, Optional#absent is returned.

Usage

From source file:org.opendaylight.netconf.topology.singleton.impl.tx.NetconfReadOnlyTransaction.java

@Override
public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read(final LogicalDatastoreType store,
        final YangInstanceIdentifier path) {

    LOG.trace("{}: Read {} via NETCONF: {}", id, store, path);

    final Future<Optional<NormalizedNodeMessage>> future = delegate.read(store, path);
    final SettableFuture<Optional<NormalizedNode<?, ?>>> settableFuture = SettableFuture.create();
    final CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> checkedFuture;
    checkedFuture = Futures.makeChecked(settableFuture, new Function<Exception, ReadFailedException>() {
        @Nullable/*from  ww w.j ava 2 s.co m*/
        @Override
        public ReadFailedException apply(Exception cause) {
            return new ReadFailedException("Read from transaction failed", cause);
        }
    });
    future.onComplete(new OnComplete<Optional<NormalizedNodeMessage>>() {
        @Override
        public void onComplete(final Throwable throwable,
                final Optional<NormalizedNodeMessage> normalizedNodeMessage) throws Throwable {
            if (throwable == null) {
                if (normalizedNodeMessage.isPresent()) {
                    settableFuture.set(normalizedNodeMessage
                            .transform(new Function<NormalizedNodeMessage, NormalizedNode<?, ?>>() {

                                @Nullable
                                @Override
                                public NormalizedNode<?, ?> apply(final NormalizedNodeMessage input) {
                                    return input.getNode();
                                }
                            }));
                } else {
                    settableFuture.set(Optional.absent());
                }
            } else {
                settableFuture.setException(throwable);
            }
        }
    }, actorSystem.dispatcher());
    return checkedFuture;
}

From source file:org.robotninjas.barge.log.journalio.JournalRaftLog.java

@Override
protected void recordVote(Optional<Replica> vote) {
    write(LogProto.JournalEntry.newBuilder()
            .setVote(LogProto.Vote.newBuilder().setVotedFor(vote.transform(toStringFunction()).or("")))
            .build());//from w w w  . j av  a2s. c o m
}

From source file:org.opendaylight.yangtools.yang.data.impl.schema.tree.OperationWithModification.java

/**
 * Read a particular child. If the child has been modified and does not have a stable
 * view, one will we instantiated with specified version.
 *
 * @param child/* w  w  w .j a  v  a2  s  .  com*/
 * @param version
 * @return
 */
Optional<NormalizedNode<?, ?>> read(final PathArgument child, final Version version) {
    final Optional<ModifiedNode> maybeChild = modification.getChild(child);
    if (maybeChild.isPresent()) {
        final ModifiedNode childNode = maybeChild.get();

        Optional<TreeNode> snapshot = childNode.getSnapshot();
        if (snapshot == null) {
            // Snapshot is not present, force instantiation
            snapshot = applyOperation.getChild(child).get().apply(childNode, childNode.getOriginal(), version);
        }

        return snapshot.transform(TreeNode::getData);
    }

    Optional<TreeNode> snapshot = modification.getSnapshot();
    if (snapshot == null) {
        snapshot = apply(modification.getOriginal(), version);
    }

    if (snapshot.isPresent()) {
        return snapshot.get().getChild(child).transform(TreeNode::getData);
    }

    return Optional.absent();
}

From source file:org.apache.james.imap.processor.GetAnnotationProcessor.java

private List<MailboxAnnotation> filterItemsBySize(Responder responder, String mailboxName,
        List<MailboxAnnotation> mailboxAnnotations, final Optional<Integer> maxsize) {
    Predicate<MailboxAnnotation> lowerPredicate = new Predicate<MailboxAnnotation>() {
        @Override// ww w  .  java  2 s.c om
        public boolean apply(final MailboxAnnotation input) {
            return maxsize.transform(new Function<Integer, Boolean>() {
                @Override
                public Boolean apply(Integer maxSizeInput) {
                    return (input.size() <= maxSizeInput);
                }
            }).or(true);
        }
    };

    return FluentIterable.from(mailboxAnnotations).filter(lowerPredicate).toList();
}

From source file:org.apache.aurora.scheduler.TaskVars.java

private void updateRackCounters(IScheduledTask task, ScheduleStatus newState) {
    final String host = task.getAssignedTask().getSlaveHost();
    Optional<String> rack;
    if (Strings.isNullOrEmpty(task.getAssignedTask().getSlaveHost())) {
        rack = Optional.absent();
    } else {/*from   ww w.j  a v a2 s.  c  o m*/
        rack = storage.read(storeProvider -> {
            Optional<IAttribute> rack1 = FluentIterable
                    .from(AttributeStore.Util.attributesOrNone(storeProvider, host)).firstMatch(IS_RACK);
            return rack1.transform(ATTR_VALUE);
        });
    }

    // Always dummy-read the lost-tasks-per-rack stat. This ensures that there is at least a zero
    // exported for all racks.
    if (rack.isPresent()) {
        counters.getUnchecked(rackStatName(rack.get()));
    }

    if (newState == ScheduleStatus.LOST) {
        if (rack.isPresent()) {
            counters.getUnchecked(rackStatName(rack.get())).increment();
        } else {
            LOG.warn("Failed to find rack attribute associated with host " + host);
        }
    }
}

From source file:org.onos.yangtools.yang.data.impl.schema.tree.OperationWithModification.java

/**
 * Read a particular child. If the child has been modified and does not have a stable
 * view, one will we instantiated with specified version.
 *
 * @param child// w  ww. j  a  v  a 2 s. co  m
 * @param version
 * @return
 */
Optional<NormalizedNode<?, ?>> read(final PathArgument child, final Version version) {
    final Optional<ModifiedNode> maybeChild = modification.getChild(child);
    if (maybeChild.isPresent()) {
        final ModifiedNode childNode = maybeChild.get();

        Optional<TreeNode> snapshot = childNode.getSnapshot();
        if (snapshot == null) {
            // Snapshot is not present, force instantiation
            snapshot = applyOperation.getChild(child).get().apply(childNode, childNode.getOriginal(), version);
        }

        return snapshot.transform(READ_DATA);
    }

    Optional<TreeNode> snapshot = modification.getSnapshot();
    if (snapshot == null) {
        snapshot = apply(modification.getOriginal(), version);
    }

    if (snapshot.isPresent()) {
        return snapshot.get().getChild(child).transform(READ_DATA);
    }

    return Optional.absent();
}

From source file:ezbake.deployer.configuration.EzDeployerConfiguration.java

/**
 * Get a configuration value as an int.//from   www. ja v a 2 s.  c  om
 * If key did not specify a default value, and its not required, will return 0 if does not exist.
 */
private int getInt(Key key) {
    Optional<String> val = get(key);
    return val.transform(new Function<String, Integer>() {
        @Override
        public Integer apply(String input) {
            return Integer.parseInt(input);
        }
    }).or(0); // or 0 is if no default was defined, but the value was null and not required.
}

From source file:ezbake.deployer.configuration.EzDeployerConfiguration.java

/**
 * Get a configuration value as a long.//from  w w w  . j  a  v  a 2  s.c o  m
 * If key did not specify a default value, and its not required, will return 0 if does not exist.
 */
private long getLong(Key key) {
    Optional<String> val = get(key);
    return val.transform(new Function<String, Long>() {
        @Override
        public Long apply(String input) {
            return Long.parseLong(input);
        }
    }).or(0L); // or 0 is if no default was defined, but the value was null and not required.
}

From source file:ezbake.deployer.configuration.EzDeployerConfiguration.java

/**
 * Get a configuration value as a boolean.
 * If key did not specify a default value, and its not required, will return false if does not exist.
 *//*from  w w w . jav a2s .  c o  m*/
private boolean getBoolean(Key key) {
    Optional<String> val = get(key);
    return val.transform(new Function<String, Boolean>() {
        @Override
        public Boolean apply(String input) {
            return Boolean.parseBoolean(input);
        }
    }).or(false); // or false is if no default was defined, but the value was null and not required.
}

From source file:springfox.documentation.schema.property.ModelPropertiesKeyGenerator.java

@Override
public Object generate(Object target, Method method, Object... params) {
    Optional<ResolvedType> type = FluentIterable.from(newArrayList(params)).filter(ResolvedType.class).first();
    Optional<ModelContext> context = FluentIterable.from(newArrayList(params)).filter(ModelContext.class)
            .first();// w  ww. j a  v  a2s .  co  m
    if (!type.isPresent()) {
        throw new IllegalArgumentException(
                "Key generator can only be used where atleast one parameter is of type " + "ResolvedType");
    }
    StringBuilder sb = new StringBuilder();
    sb.append(type.get().toString());
    sb.append(context.transform(returnTypeComponent()).or(""));
    LOG.info("Cache key generated: {}", sb.toString());
    return sb.toString();
}