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

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.google.errorprone.bugpatterns.IsInstanceOfClass.java

static String buildReplacement(MethodInvocationTree tree, VisitorState state) {

    Operand lhs = classify((JCTree) ASTHelpers.getReceiver(tree.getMethodSelect()), state);
    Operand rhs = classify((JCTree) Iterables.getOnlyElement(tree.getArguments()), state);

    // expr.getClass().isInstance(Bar.class) -> expr instanceof Bar
    if (lhs.kind() == Kind.GET_CLASS && rhs.kind() == Kind.LITERAL) {
        return String.format("%s instanceof %s", lhs.value(), rhs.value());
    }//  w ww  .j  av  a  2 s.  c  o m

    // expr1.getClass().isInstance(expr2.getClass()) -> expr2.getClass().isInstance(expr1)
    if (lhs.kind() == Kind.GET_CLASS && rhs.kind() == Kind.GET_CLASS) {
        return String.format("%s.getClass().isInstance(%s)", rhs.value(), lhs.value());
    }

    // Foo.class.isInstance(Bar.class) -> Bar.class == Class.class
    if (lhs.kind() == Kind.LITERAL && rhs.kind() == Kind.LITERAL) {
        return String.format("%s.class == Class.class", rhs.value()); // !!
    }

    // Foo.class.isInstance(expr.getClass()) -> expr instanceof Foo
    if (lhs.kind() == Kind.LITERAL && rhs.kind() == Kind.GET_CLASS) {
        return String.format("%s instanceof %s", rhs.value(), lhs.value());
    }

    // clazz.isInstance(expr.getClass()) -> clazz.isInstance(expr)
    if (rhs.kind() == Kind.GET_CLASS) {
        return String.format("%s.isInstance(%s)", lhs.source(), rhs.value());
    }

    // expr.getClass().isInstance(clazz) -> clazz.isInstance(expr)
    if (lhs.kind() == Kind.GET_CLASS) {
        return String.format("%s.isInstance(%s)", rhs.source(), lhs.value());
    }

    // clazz1.isInstance(clazz2) -> clazz2.isAssignableFrom(clazz1)
    // clazz.isInstance(Bar.class) -> Bar.class.isAssignableFrom(clazz)
    // Foo.class.isInstance(clazz) -> clazz.isAssignableFrom(Foo.class)
    return String.format("%s.isAssignableFrom(%s)", rhs.source(), lhs.source());
}

From source file:google.registry.util.X509Utils.java

/**
 * Loads an ASCII-armored public X.509 certificate.
 *
 * @throws CertificateParsingException on parsing errors.
 *///from   www.  j  a va  2 s. c  o  m
public static X509Certificate loadCertificate(InputStream input) throws CertificateParsingException {
    try {
        return Iterables.getOnlyElement(
                FluentIterable.from(CertificateFactory.getInstance("X.509").generateCertificates(input))
                        .filter(X509Certificate.class));
    } catch (CertificateException e) { // CertificateParsingException by specification.
        propagateIfInstanceOf(e, CertificateParsingException.class);
        throw new CertificateParsingException(e);
    } catch (NoSuchElementException e) {
        throw new CertificateParsingException("No X509Certificate found.");
    } catch (IllegalArgumentException e) {
        throw new CertificateParsingException("Multiple X509Certificate found.");
    }
}

From source file:org.apache.beam.runners.samza.translation.ConfigContext.java

public String getOutputId(TransformHierarchy.Node node) {
    return getIdForPValue(Iterables.getOnlyElement(node.getOutputs().values()));
}

From source file:org.onebusaway.voicexml.actions.StopSearchAction.java

@Override
public String execute() {
    _matches = _nycTransitDataService.getStops(makeSearchQuery(_stopCode)).getStops();

    if (_matches.size() == 1) {
        _stopId = Iterables.getOnlyElement(_matches).getId();
        return "showStopResult";
    } else {/*from  ww w.  java  2s  . c  om*/
        return SUCCESS;
    }
}

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

@Override
public Description matchCatch(CatchTree tree, VisitorState state) {
    List<? extends StatementTree> statements = tree.getBlock().getStatements();
    if (statements.size() != 1) {
        return NO_MATCH;
    }/*w  w w  .  j  av  a 2s.  c o m*/
    StatementTree statement = Iterables.getOnlyElement(statements);
    if (!MATCHER.matches(statement, state)) {
        return NO_MATCH;
    }
    return describeMatch(statement);
}

From source file:com.opengamma.financial.analytics.model.curve.HardCodedG2ppParametersFunction.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(G2PP_PARAMETERS, ComputationTargetSpecification.NULL,
            properties);/*from   ww w  . ja va2s .c  om*/
    return Collections.singleton(new ComputedValue(spec, CONSTANT_PARAMETERS));
}

From source file:com.google.devtools.build.lib.rules.android.ApplicationManifest.java

public static ApplicationManifest fromResourcesRule(RuleContext ruleContext) {
    final AndroidResourcesProvider resources = AndroidCommon.getAndroidResources(ruleContext);
    if (resources == null) {
        ruleContext.attributeError("manifest", "a resources or manifest attribute is mandatory.");
        return null;
    }// ww w  .j  av a 2  s.  c  om
    return new ApplicationManifest(ruleContext,
            Iterables.getOnlyElement(resources.getDirectAndroidResources()).getManifest());
}

From source file:org.jclouds.ec2.predicates.InstanceStateTerminated.java

private RunningInstance refresh(RunningInstance instance) {
    return Iterables.getOnlyElement(Iterables.getOnlyElement(
            client.getInstanceApi().get().describeInstancesInRegion(instance.getRegion(), instance.getId())));
}

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

/**
 * Create a union from a collection of types.
 *
 * @param members Member types of the union.
 * @return Union of those types. If there is exactly one distinct type in members, then this will
 *     not be a UnionType.// w w  w .ja v  a 2s . com
 */
public static SoyType of(Collection<SoyType> members) {
    ImmutableSet<SoyType> flattenedMembers = flatten(members);
    if (flattenedMembers.size() == 1) {
        return Iterables.getOnlyElement(flattenedMembers);
    }
    // unions with the error type should just resolve to the error type to simplify analysis.
    if (flattenedMembers.contains(ErrorType.getInstance())) {
        return ErrorType.getInstance();
    }
    return new UnionType(flattenedMembers);
}

From source file:org.jclouds.ec2.compute.predicates.SecurityGroupPresent.java

protected SecurityGroup refresh(RegionAndName securityGroup) {
    return Iterables.getOnlyElement(client.getSecurityGroupApi().get()
            .describeSecurityGroupsInRegion(securityGroup.getRegion(), securityGroup.getName()));
}