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

Introduction

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

Prototype

public static boolean isEmpty(Iterable<?> iterable)

Source Link

Document

Determines if the given iterable contains no elements.

Usage

From source file:com.github.ferstl.maven.pomenforcers.priority.CompoundPriorityOrdering.java

public static <T, P extends Comparable<P>, F extends PriorityOrderingFactory<P, T>> CompoundPriorityOrdering<T, P, F> orderBy(
        Iterable<F> artifactElements) {
    if (Iterables.isEmpty(artifactElements)) {
        throw new IllegalArgumentException("No order specified.");
    }//  w  ww. j  a va 2 s .  c o m
    return new CompoundPriorityOrdering<>(artifactElements);
}

From source file:nextmethod.web.razor.tokenizer.symbols.SymbolExtensions.java

public static LocationTagged<String> getContent(@Nullable final Iterable<? extends ISymbol> symbols,
        @Nonnull final SourceLocation spanStart) {
    if (symbols == null || Iterables.isEmpty(symbols)) {
        return new LocationTagged<>(Strings.Empty, spanStart);
    } else {//www .j a v a  2 s. c o  m
        final ISymbol first = Iterables.getFirst(symbols, null);
        final StringBuilder sb = new StringBuilder();
        for (ISymbol symbol : symbols) {
            sb.append(symbol.getContent());
        }
        return new LocationTagged<>(sb.toString(), SourceLocation.add(spanStart, first.getStart()));
    }
}

From source file:org.apache.mahout.math.als.AlternatingLeastSquaresSolver.java

public static Vector solve(Iterable<Vector> featureVectors, Vector ratingVector, double lambda,
        int numFeatures) {

    Preconditions.checkNotNull(featureVectors, "Feature Vectors cannot be null");
    Preconditions.checkArgument(!Iterables.isEmpty(featureVectors));
    Preconditions.checkNotNull(ratingVector, "Rating Vector cannot be null");
    Preconditions.checkArgument(ratingVector.getNumNondefaultElements() > 0, "Rating Vector cannot be empty");
    Preconditions.checkArgument(Iterables.size(featureVectors) == ratingVector.getNumNondefaultElements());

    int nui = ratingVector.getNumNondefaultElements();

    Matrix MiIi = createMiIi(featureVectors, numFeatures);
    Matrix RiIiMaybeTransposed = createRiIiMaybeTransposed(ratingVector);

    /* compute Ai = MiIi * t(MiIi) + lambda * nui * E */
    Matrix Ai = miTimesMiTransposePlusLambdaTimesNuiTimesE(MiIi, lambda, nui);
    /* compute Vi = MiIi * t(R(i,Ii)) */
    Matrix Vi = MiIi.times(RiIiMaybeTransposed);
    /* compute Ai * ui = Vi */
    return solve(Ai, Vi);
}

From source file:org.richfaces.cdk.util.MorePredicates.java

public static <S, D> Predicate<D> none(Iterable<S> options, Function<S, Predicate<D>> function) {
    if (options == null || Iterables.isEmpty(options)) {
        return Predicates.alwaysTrue();
    }// w w w  . java  2 s.  c  om

    Predicate<D> compositePredicate = Predicates.or(Iterables.transform(options, function));
    return Predicates.not(compositePredicate);
}

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

public static QualifiedName of(Iterable<String> parts) {
    Preconditions.checkNotNull(parts, "parts is null");
    Preconditions.checkArgument(!Iterables.isEmpty(parts), "parts is empty");

    return new QualifiedName(parts);
}

From source file:org.apache.aurora.scheduler.config.validators.NotEmptyIterable.java

@Override
public void validate(String name, Iterable<?> value) throws ParameterException {
    if (Iterables.isEmpty(value)) {
        throw new ParameterException(String.format("%s must not be empty", name));
    }/*from   ww w.  j  a  v a2  s. c  om*/
}

From source file:nz.co.testamation.core.waiting.WaitForEmpty.java

public WaitForEmpty() {
    super(new Predicate<T>() {
        @Override/*from  w w  w. ja  v a2s  .co m*/
        public boolean apply(T t) {
            return Iterables.isEmpty(t);
        }
    });
}

From source file:nz.co.testamation.core.waiting.WaitForNotEmpty.java

public WaitForNotEmpty() {
    super(new Predicate<T>() {
        @Override//from  ww w.ja va 2 s .  c  o m
        public boolean apply(T t) {
            return !Iterables.isEmpty(t);
        }
    });
}

From source file:org.jpmml.evaluator.BatchUtil.java

/**
 * Evaluates the model using arguments from the specified CSV resource.
 *
 * @return <code>true</code> If there were no differences between expected and actual results, <code>false</code> otherwise.
 */// w w  w .  j  av  a  2  s .  c o  m
static public boolean evaluate(Batch batch, double precision, double zeroThreshold) throws Exception {
    List<MapDifference<FieldName, ?>> differences = difference(batch, precision, zeroThreshold);

    return Iterables.isEmpty(differences);
}

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

/** Returns the earliest element in a {@link DateTime} iterable. */
public static DateTime earliestOf(Iterable<DateTime> dates) {
    checkArgument(!Iterables.isEmpty(dates));
    return Ordering.<DateTime>natural().min(dates);
}