Example usage for java.util.function Predicate test

List of usage examples for java.util.function Predicate test

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Introduction

In this page you can find the example usage for java.util.function Predicate test.

Prototype

boolean test(T t);

Source Link

Document

Evaluates this predicate on the given argument.

Usage

From source file:fr.landel.utils.commons.ObjectUtils.java

/**
 * Get the transformed value if not {@code null}
 * // w  ww  .  j ava  2 s .  co m
 * @param predicate
 *            the predicate (cannot be {@code null})
 * @param object
 *            the object to transform
 * @param transformer
 *            the transformer function (cannot be {@code null})
 * @param <T>
 *            the type of the object to check
 * @param <X>
 *            the type of the output
 * @return the transformed value or {@code null}
 */
public static <T, X> X ifPredicate(final Predicate<T> predicate, final T object,
        final Function<T, X> transformer) {
    Objects.requireNonNull(predicate, PREDICATE_ERROR);
    Objects.requireNonNull(transformer, TRANSFORMER_ERROR);

    return predicate.test(object) ? transformer.apply(object) : null;
}

From source file:fr.landel.utils.commons.ObjectUtils.java

/**
 * Get the transformed value if not {@code null}
 * /*from   w w  w .j  a v  a  2 s . c o m*/
 * @param predicate
 *            the predicate (cannot be {@code null})
 * @param object
 *            the object to transform
 * @param transformer
 *            the transformer function (cannot be {@code null})
 * @param <T>
 *            the type of the object to check
 * @param <X>
 *            the type of the output
 * @return an {@link Optional} of the transformed value or
 *         {@link Optional#empty()}
 */
public static <T, X> Optional<X> ifPredicateOptional(final Predicate<T> predicate, final T object,
        final Function<T, X> transformer) {
    Objects.requireNonNull(predicate, PREDICATE_ERROR);
    Objects.requireNonNull(transformer, TRANSFORMER_ERROR);

    return predicate.test(object) ? Optional.ofNullable(transformer.apply(object)) : Optional.empty();
}

From source file:com.vmware.photon.controller.common.xenon.ServiceHostUtils.java

/**
 * Generic wait function./*from ww  w.  j  a va 2 s  .c om*/
 */
public static <T> T waitForState(Supplier<T> supplier, Predicate<T> predicate, long waitIterationSleepMillis,
        long waitIterationCount, Runnable cleanup, String timeoutMessage) throws Throwable {
    for (int i = 0; i < waitIterationCount; i++) {
        T t = supplier.get();
        if (predicate.test(t)) {
            return t;
        }
        Thread.sleep(waitIterationSleepMillis);
    }

    if (cleanup != null) {
        cleanup.run();
    }

    logger.warn(timeoutMessage);
    throw new TimeoutException(timeoutMessage);
}

From source file:at.gridtec.lambda4j.predicate.tri.obj.ObjBiBooleanPredicate.java

/**
 * Creates a {@link ObjBiBooleanPredicate} which uses the {@code first} parameter of this one as argument for the
 * given {@link Predicate}.//from w w w  . j  a va 2 s. com
 *
 * @param <T> The type of the first argument to the predicate
 * @param predicate The predicate which accepts the {@code first} parameter of this one
 * @return Creates a {@code ObjBiBooleanPredicate} which uses the {@code first} parameter of this one as argument
 * for the given {@code Predicate}.
 * @throws NullPointerException If given argument is {@code null}
 */
@Nonnull
static <T> ObjBiBooleanPredicate<T> onlyFirst(@Nonnull final Predicate<? super T> predicate) {
    Objects.requireNonNull(predicate);
    return (t, value1, value2) -> predicate.test(t);
}

From source file:fr.landel.utils.commons.ObjectUtils.java

/**
 * Returns a default value if the object doesn't match the predicate.
 * //from  w w  w.  ja  va2 s . c  o  m
 * <pre>
 * ObjectUtils.defaultIf(Objects::nonNull, null, () -&gt; null)          = null
 * ObjectUtils.defaultIf(Objects::nonNull, null, () -&gt; "")            = ""
 * ObjectUtils.defaultIf(Objects::nonNull, null, () -&gt; "zz")          = "zz"
 * ObjectUtils.defaultIf(Objects::nonNull, "abc", () -&gt; *)            = "abc"
 * ObjectUtils.defaultIf(Objects::nonNull, Boolean.TRUE, () -&gt; *)     = Boolean.TRUE
 * </pre>
 * 
 * @param predicate
 *            the predicate (cannot be {@code null})
 * @param object
 *            the {@code Object} to test, may be {@code null}
 * @param defaultValueSupplier
 *            the default value supplier, cannot be {@code null}, may supply
 *            {@code null}
 * @param <T>
 *            the type of the object
 * @return {@code object} if it matches the predicate, defaultValue
 *         otherwise
 * @throws NullPointerException
 *             if {@code predicate} or {@code defaultValueSupplier} are
 *             {@code null}
 */
public static <T> T defaultIf(final Predicate<T> predicate, final T object,
        final Supplier<? extends T> defaultValueSupplier) {
    Objects.requireNonNull(predicate, PREDICATE_ERROR);
    Objects.requireNonNull(defaultValueSupplier, SUPPLIER_ERROR);

    return predicate.test(object) ? object : defaultValueSupplier.get();
}

From source file:fr.landel.utils.commons.ObjectUtils.java

/**
 * Returns a default value if the object doesn't match the predicate.
 *
 * <pre>/*from  www. j ava  2  s.  c  om*/
 * ObjectUtils.defaultIf(Objects::nonNull, null, null, o -&gt; o.getTitle())              = null
 * ObjectUtils.defaultIf(Objects::nonNull, null, "",  o -&gt; o.getTitle())               = ""
 * ObjectUtils.defaultIf(Objects::nonNull, null, "zz", o -&gt; o.getTitle())              = "zz"
 * ObjectUtils.defaultIf(Objects::nonNull, "abc", "NO_TEXT", o -&gt; o.toUpperCase())     = "ABC"
 * ObjectUtils.defaultIf(Objects::nonNull, "false", Boolean.TRUE, Boolean::parseBoolean)  = Boolean.TRUE
 * </pre>
 * 
 * @param predicate
 *            the predicate (cannot be {@code null})
 * @param object
 *            the {@code Object} to test, may be {@code null}
 * @param defaultObject
 *            the default value
 * @param transformer
 *            the object mapper
 * @param <T>
 *            the type of the object
 * @param <X>
 *            the type of output
 * @return {@code object} if it matches the predicate, defaultValue
 *         otherwise
 * @throws NullPointerException
 *             if {@code predicate} or {@code transformer} are {@code null}
 */
public static <T, X> X defaultIf(final Predicate<T> predicate, final T object, final X defaultObject,
        final Function<T, X> transformer) {
    Objects.requireNonNull(predicate, PREDICATE_ERROR);
    Objects.requireNonNull(transformer, TRANSFORMER_ERROR);

    return predicate.test(object) ? transformer.apply(object) : defaultObject;
}

From source file:at.gridtec.lambda4j.predicate.tri.obj.ObjBiBytePredicate.java

/**
 * Creates a {@link ObjBiBytePredicate} which uses the {@code first} parameter of this one as argument for the given
 * {@link Predicate}./*  w ww.j a v a2 s .c  o  m*/
 *
 * @param <T> The type of the first argument to the predicate
 * @param predicate The predicate which accepts the {@code first} parameter of this one
 * @return Creates a {@code ObjBiBytePredicate} which uses the {@code first} parameter of this one as argument for
 * the given {@code Predicate}.
 * @throws NullPointerException If given argument is {@code null}
 */
@Nonnull
static <T> ObjBiBytePredicate<T> onlyFirst(@Nonnull final Predicate<? super T> predicate) {
    Objects.requireNonNull(predicate);
    return (t, value1, value2) -> predicate.test(t);
}

From source file:at.gridtec.lambda4j.predicate.tri.obj.ObjBiCharPredicate.java

/**
 * Creates a {@link ObjBiCharPredicate} which uses the {@code first} parameter of this one as argument for the given
 * {@link Predicate}./*from   w  w  w .j  a v  a  2 s  . co  m*/
 *
 * @param <T> The type of the first argument to the predicate
 * @param predicate The predicate which accepts the {@code first} parameter of this one
 * @return Creates a {@code ObjBiCharPredicate} which uses the {@code first} parameter of this one as argument for
 * the given {@code Predicate}.
 * @throws NullPointerException If given argument is {@code null}
 */
@Nonnull
static <T> ObjBiCharPredicate<T> onlyFirst(@Nonnull final Predicate<? super T> predicate) {
    Objects.requireNonNull(predicate);
    return (t, value1, value2) -> predicate.test(t);
}

From source file:at.gridtec.lambda4j.predicate.tri.obj.ObjBiFloatPredicate.java

/**
 * Creates a {@link ObjBiFloatPredicate} which uses the {@code first} parameter of this one as argument for the
 * given {@link Predicate}./*  www.  j a va  2  s  .  c  o  m*/
 *
 * @param <T> The type of the first argument to the predicate
 * @param predicate The predicate which accepts the {@code first} parameter of this one
 * @return Creates a {@code ObjBiFloatPredicate} which uses the {@code first} parameter of this one as argument for
 * the given {@code Predicate}.
 * @throws NullPointerException If given argument is {@code null}
 */
@Nonnull
static <T> ObjBiFloatPredicate<T> onlyFirst(@Nonnull final Predicate<? super T> predicate) {
    Objects.requireNonNull(predicate);
    return (t, value1, value2) -> predicate.test(t);
}

From source file:at.gridtec.lambda4j.predicate.tri.obj.ObjBiIntPredicate.java

/**
 * Creates a {@link ObjBiIntPredicate} which uses the {@code first} parameter of this one as argument for the given
 * {@link Predicate}.//w  w w  .j a v  a2  s.  co  m
 *
 * @param <T> The type of the first argument to the predicate
 * @param predicate The predicate which accepts the {@code first} parameter of this one
 * @return Creates a {@code ObjBiIntPredicate} which uses the {@code first} parameter of this one as argument for
 * the given {@code Predicate}.
 * @throws NullPointerException If given argument is {@code null}
 */
@Nonnull
static <T> ObjBiIntPredicate<T> onlyFirst(@Nonnull final Predicate<? super T> predicate) {
    Objects.requireNonNull(predicate);
    return (t, value1, value2) -> predicate.test(t);
}