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package org.apache.juneau.internal;

import java.util.function.*;

/**
 * Utilities when working with {@link Predicate Predicates} and {@link Consumer Consumers}.
 */
public final class ConsumerUtils {

	/**
	 * Returns true if the specified predicate is null or matches the specified value.

	 * @param  The type being tested.
	 * @param predicate The predicate.
	 * @param value The value to test.
	 * @return true if the specified predicate is null or matches the specified value.
	 */
	public static  boolean test(Predicate predicate, T value) {
		return (predicate == null || predicate.test(value));
	}

	/**
	 * Returns true if the specified object is the specified type and the specified predicate is null or matches the specified value.
	 *
	 * @param  The type being tested.
	 * @param type The expected type.
	 * @param predicate The predicate.
	 * @param value The value.
	 * @return true if the specified predicate is null or matches the specified value.
	 */
	public static  boolean test(Class type, Predicate predicate, Object value) {
		return type.isInstance(value) && (predicate == null || predicate.test(type.cast(value)));
	}

	/**
	 * Consumes the specified value if the predicate is null or matches the specified value.
	 *
	 * @param  The type being consumed.
	 * @param predicate The predicate.
	 * @param consumer The consumer.
	 * @param value The value.
	 */
	public static  void consume(Predicate predicate, Consumer consumer, T value) {
		if (test(predicate, value))
			consumer.accept(value);
	}

	/**
	 * Consumes the specified value if it's the specified type and the predicate is null or matches the specified value.
	 *
	 * @param  The type being consumed.
	 * @param type The expected type.
	 * @param predicate The predicate.
	 * @param consumer The consumer.
	 * @param value The value.
	 */
	public static  void consume(Class type, Predicate predicate, Consumer consumer, Object value) {
		if (test(type, predicate, value))
			consumer.accept(type.cast(value));
	}
}