Example usage for com.google.common.collect Iterables getOnlyElement

List of usage examples for com.google.common.collect Iterables getOnlyElement

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Introduction

In this page you can find the example usage for com.google.common.collect Iterables getOnlyElement.

Prototype

public static <T> T getOnlyElement(Iterable<T> iterable)

Source Link

Document

Returns the single element contained in iterable .

Usage

From source file:com.opengamma.financial.analytics.model.forex.option.callspreadblack.FXDigitalCallSpreadBlackVegaMatrixFunction.java

@Override
protected Set<ComputedValue> getResult(final InstrumentDerivative fxDigital,
        final ForexOptionDataBundle<?> data, final ComputationTarget target,
        final Set<ValueRequirement> desiredValues, final FunctionInputs inputs, final ValueSpecification spec,
        final FunctionExecutionContext executionContext) {
    final String spreadName = Iterables.getOnlyElement(desiredValues)
            .getConstraint(CalculationPropertyNamesAndValues.PROPERTY_CALL_SPREAD_VALUE);
    final double spread = Double.parseDouble(spreadName);
    final PresentValueBlackVolatilityNodeSensitivityCallSpreadBlackForexCalculator calculator = new PresentValueBlackVolatilityNodeSensitivityCallSpreadBlackForexCalculator(
            spread);/* ww w  .j a va  2 s .com*/
    final PresentValueForexBlackVolatilityNodeSensitivityDataBundle result = fxDigital.accept(calculator,
            (SmileDeltaTermStructureDataBundle) data.getVolatilityModel());
    final double[] expiries = result.getExpiries().getData();
    final double[] delta = result.getDelta().getData();
    final double[][] vega = result.getVega().getData();
    final int nDelta = delta.length;
    final int nExpiries = expiries.length;
    final Double[] rowValues = new Double[nExpiries];
    final String[] rowLabels = new String[nExpiries];
    final Double[] columnValues = new Double[nDelta];
    final String[] columnLabels = new String[nDelta];
    final double[][] values = new double[nDelta][nExpiries];
    for (int i = 0; i < nDelta; i++) {
        columnValues[i] = delta[i];
        columnLabels[i] = "P" + DELTA_FORMATTER.format(delta[i] * 100) + " "
                + result.getCurrencyPair().getFirst() + "/" + result.getCurrencyPair().getSecond();
        for (int j = 0; j < nExpiries; j++) {
            if (i == 0) {
                rowValues[j] = expiries[j];
                rowLabels[j] = getFormattedExpiry(expiries[j]);
            }
            values[i][j] = vega[j][i];
        }
    }
    return Collections.singleton(new ComputedValue(spec,
            new DoubleLabelledMatrix2D(rowValues, rowLabels, columnValues, columnLabels, values)));
}

From source file:grakn.core.graql.gremlin.sets.LabelFragmentSet.java

/**
 * Expand a {@link LabelFragmentSet} to match all sub-concepts of the single existing {@link Label}.
 *
 * Returns null if there is not exactly one label any of the {@link Label}s mentioned are not in the knowledge base.
 */// w w  w . j av a2 s  .c o  m
@Nullable
LabelFragmentSet tryExpandSubs(Variable typeVar, TransactionOLTP tx) {
    if (labels().size() != 1)
        return null;

    Label oldLabel = Iterables.getOnlyElement(labels());

    SchemaConcept concept = tx.getSchemaConcept(oldLabel);
    if (concept == null)
        return null;

    Set<Label> newLabels = concept.subs().map(SchemaConcept::label).collect(toSet());

    return new AutoValue_LabelFragmentSet(varProperty(), typeVar, ImmutableSet.copyOf(newLabels));
}

From source file:com.google.devtools.build.lib.exec.FileWriteStrategy.java

@Override
public void exec(AbstractFileWriteAction action, ActionExecutionContext actionExecutionContext)
        throws ExecException, InterruptedException {

    try (AutoProfiler p = AutoProfiler.logged("running " + action.prettyPrint(), LOG,
            /*minTimeForLoggingInMilliseconds=*/ 100)) {
        try {//from   w  w w .java2 s .  c  o  m
            Path outputPath = Iterables.getOnlyElement(action.getOutputs()).getPath();
            try (OutputStream out = new BufferedOutputStream(outputPath.getOutputStream())) {
                action.newDeterministicWriter(actionExecutionContext).writeOutputFile(out);
            }
            if (action.makeExecutable()) {
                outputPath.setExecutable(true);
            }
        } catch (IOException e) {
            throw new EnvironmentalExecException(
                    "failed to create file '" + Iterables.getOnlyElement(action.getOutputs()).prettyPrint()
                            + "' due to I/O error: " + e.getMessage(),
                    e);
        }
    }
}

From source file:com.google.errorprone.bugpatterns.InfiniteRecursion.java

@Override
public Description matchMethod(MethodTree tree, VisitorState state) {
    if (tree.getBody() == null || tree.getBody().getStatements().size() != 1) {
        return NO_MATCH;
    }//from w  ww.j a v a 2 s  .  c o m
    Tree statement = TreeInfo.skipParens((JCTree) Iterables.getOnlyElement(tree.getBody().getStatements()));
    ExpressionTree expr = statement.accept(new SimpleTreeVisitor<ExpressionTree, Void>() {
        @Override
        public ExpressionTree visitExpressionStatement(ExpressionStatementTree tree, Void unused) {
            return tree.getExpression();
        }

        @Override
        public ExpressionTree visitReturn(ReturnTree tree, Void unused) {
            return tree.getExpression();
        }
    }, null);
    if (!(expr instanceof MethodInvocationTree)) {
        return NO_MATCH;
    }
    ExpressionTree select = ((MethodInvocationTree) expr).getMethodSelect();
    switch (select.getKind()) {
    case IDENTIFIER:
        break;
    case MEMBER_SELECT:
        ExpressionTree receiver = ((MemberSelectTree) select).getExpression();
        if (receiver.getKind() != Kind.IDENTIFIER) {
            return NO_MATCH;
        }
        if (!((IdentifierTree) receiver).getName().contentEquals("this")) {
            return NO_MATCH;
        }
        break;
    default:
        return NO_MATCH;
    }
    MethodSymbol sym = ASTHelpers.getSymbol(tree);
    if (sym == null || !sym.equals(ASTHelpers.getSymbol(expr))) {
        return NO_MATCH;
    }
    return describeMatch(statement);
}

From source file:org.apache.accumulo.test.merkle.MerkleTree.java

public MerkleTreeNode getRootNode() throws NoSuchAlgorithmException {
    ArrayList<MerkleTreeNode> buffer = new ArrayList<>(leaves.size());
    buffer.addAll(leaves);//  ww  w .ja  va 2s  .  c om

    while (buffer.size() > 1) {
        // Find two nodes that we want to roll up
        Pair<Integer, Integer> pairToJoin = findNextPair(buffer);

        // Make a parent node from them
        MerkleTreeNode parent = new MerkleTreeNode(
                Arrays.asList(buffer.get(pairToJoin.getFirst()), buffer.get(pairToJoin.getSecond())),
                digestAlgorithm);

        // Insert it back into the "tree" at the position of the first child
        buffer.set(pairToJoin.getFirst(), parent);

        // Remove the second child completely
        buffer.remove(pairToJoin.getSecond().intValue());

        // "recurse"
    }

    return Iterables.getOnlyElement(buffer);
}

From source file:com.google.template.soy.types.aggregate.UnionType.java

/**
 * Create a union from a collection of types.
 * @param members Member types of the union.
 * @return Union of those types./*from w  w  w.  j a  v a  2 s.co  m*/
 *    If there is exactly one distinct type in members, then this will not be a UnionType.
 */
public static SoyType of(Collection<SoyType> members) {
    ImmutableSet<SoyType> flattenedMembers = flatten(members);
    if (flattenedMembers.size() == 1) {
        return Iterables.getOnlyElement(flattenedMembers);
    }
    return new UnionType(flattenedMembers);
}

From source file:com.google.template.soy.jssrc.dsl.ConditionalExpressionBuilder.java

@Nullable
private Expression tryCreateTernary(ImmutableList<IfThenPair<Expression>> pairs) {
    if (pairs.size() != 1 || trailingElse == null) {
        return null;
    }/*  www  . j  a va  2 s  .c  o m*/

    IfThenPair<Expression> ifThen = Iterables.getOnlyElement(pairs);
    Expression predicate = ifThen.predicate;
    Expression consequent = ifThen.consequent;
    // TODO(lukes): we could support nested ternaries with little additional difficulty
    if (predicate.initialStatements().containsAll(consequent.initialStatements())
            && predicate.initialStatements().containsAll(trailingElse.initialStatements())) {
        return Ternary.create(predicate, consequent, trailingElse);
    }
    return null;
}

From source file:com.opengamma.financial.analytics.model.curve.HardCodedHullWhiteOneFactorParametersFunction.java

@Override
public Set<ComputedValue> execute(final FunctionExecutionContext executionContext, final FunctionInputs inputs,
        final ComputationTarget target, final Set<ValueRequirement> desiredValues)
        throws AsynchronousExecution {
    final ValueProperties properties = Iterables.getOnlyElement(desiredValues).getConstraints().copy().get();
    final ValueSpecification spec = new ValueSpecification(HULL_WHITE_ONE_FACTOR_PARAMETERS,
            target.toSpecification(), properties);
    return Collections.singleton(new ComputedValue(spec, CONSTANT_PARAMETERS));
}

From source file:com.eucalyptus.compute.vpc.persist.PersistenceInternetGateways.java

@Override
public <T> T lookupByVpc(@Nullable final OwnerFullName ownerFullName, final String vpcId,
        final Function<? super InternetGateway, T> transform) throws VpcMetadataException {
    try {/*from ww w. ja  v a  2 s. c  o  m*/
        return Iterables.getOnlyElement(listByExample(InternetGateway.exampleWithOwner(ownerFullName),
                Predicates.alwaysTrue(), Restrictions.eq("vpc.displayName", vpcId),
                Collections.singletonMap("vpc", "vpc"), transform));
    } catch (NoSuchElementException e) {
        throw new VpcMetadataNotFoundException("Internet gateway not found for " + vpcId);
    }
}

From source file:io.druid.indexing.common.task.MoveTask.java

@Override
public TaskStatus run(TaskToolbox toolbox) throws Exception {
    // Confirm we have a lock (will throw if there isn't exactly one element)
    final TaskLock myLock = Iterables.getOnlyElement(getTaskLocks(toolbox));

    if (!myLock.getDataSource().equals(getDataSource())) {
        throw new ISE("WTF?! Lock dataSource[%s] != task dataSource[%s]", myLock.getDataSource(),
                getDataSource());/* w  ww  .  j  a v  a  2s . com*/
    }

    if (!myLock.getInterval().equals(getInterval())) {
        throw new ISE("WTF?! Lock interval[%s] != task interval[%s]", myLock.getInterval(), getInterval());
    }

    // List unused segments
    final List<DataSegment> unusedSegments = toolbox.getTaskActionClient()
            .submit(new SegmentListUnusedAction(myLock.getDataSource(), myLock.getInterval()));

    // Verify none of these segments have versions > lock version
    for (final DataSegment unusedSegment : unusedSegments) {
        if (unusedSegment.getVersion().compareTo(myLock.getVersion()) > 0) {
            throw new ISE("WTF?! Unused segment[%s] has version[%s] > task version[%s]",
                    unusedSegment.getIdentifier(), unusedSegment.getVersion(), myLock.getVersion());
        }

        log.info("OK to move segment: %s", unusedSegment.getIdentifier());
    }

    // Move segments
    for (DataSegment segment : unusedSegments) {
        final DataSegment movedSegment = toolbox.getDataSegmentMover().move(segment, targetLoadSpec);
        toolbox.getTaskActionClient().submit(new SegmentMetadataUpdateAction(ImmutableSet.of(movedSegment)));
    }

    return TaskStatus.success(getId());
}