Java 类org.apache.commons.collections4.functors.NotNullPredicate 实例源码

public static void main(String[] args)
{
   Map<String, String> map = PredicatedMap.predicatedMap(new CaseInsensitiveMap<String, String>(), NotNullPredicate.notNullPredicate(), NotNullPredicate.notNullPredicate());

   map.put("one", "A");

   System.out.println(map);
   System.out.printf("using oNe as the key to get the value from the map: %s\n", map.get("oNe"));
   System.out.println("Going to put a null key on the map");

   try
   {
      map.put(null, "B");
   }
   catch(Exception e) //I don't like that this process throws an exception.  I'd much rather it just not put a null key in.
   {
      System.out.println(e.getMessage());
   }

   //so to fix this I implemented my own using the abstractions provided by Commons Collections 4
   Map<String, String> map2 = new FilteringPredicatedMap<>();

   map2.put("one", "A");
   map2.put(null, "B");
   map2.put("three", null);
   map2.put("four", "D");

   System.out.println(map2);

   Map<String, String> map3 = new FilteringPredicatedMap<>(new TreeMap<>(), (i -> i != null && i.equals("one")), FilteringPredicatedMap.nullPredicateInstance());

   map3.put("one", "A");
   map3.put(null, "B");
   map3.put("three", null);
   map3.put("four", "D");

   System.out.println(map3);
}

/** 
     * Test that all Predicate singletones hold singleton pattern in
     * serialization/deserialization process.
     */
@Test
    public void testSingletonPatternInSerialization() {
        fr.inria.diversify.testamplification.logger.Logger.writeTestStart(Thread.currentThread(),this, "testSingletonPatternInSerialization");
        final Object[] singletones = new Object[]{ ExceptionPredicate.INSTANCE , FalsePredicate.INSTANCE , NotNullPredicate.INSTANCE , NullPredicate.INSTANCE , TruePredicate.INSTANCE };
        for (final Object original : singletones) {
            org.apache.commons.collections4.TestUtils.assertSameAfterSerialization(("Singletone patern broken for " + (original.getClass())), original);
        }
        fr.inria.diversify.testamplification.logger.Logger.writeTestFinish(Thread.currentThread());
    }

/** 
     * Test that all Predicate singletones hold singleton pattern in
     * serialization/deserialization process.
     */
@Test(timeout = 1000)
    public void testSingletonPatternInSerialization_add2917() {
        fr.inria.diversify.testamplification.logger.Logger.writeTestStart(Thread.currentThread(),this, "testSingletonPatternInSerialization_add2917");
        final Object[] singletones = new Object[]{ ExceptionPredicate.INSTANCE , FalsePredicate.INSTANCE , NotNullPredicate.INSTANCE , NullPredicate.INSTANCE , TruePredicate.INSTANCE };
        for (final Object original : singletones) {
            org.apache.commons.collections4.TestUtils.assertSameAfterSerialization(("Singletone patern broken for " + (original.getClass())), original);
            org.apache.commons.collections4.TestUtils.assertSameAfterSerialization(("Singletone patern broken for " + (original.getClass())), original);
        }
        fr.inria.diversify.testamplification.logger.Logger.writeTestFinish(Thread.currentThread());
    }

/** 
     * Test that all Predicate singletones hold singleton pattern in
     * serialization/deserialization process.
     */
@Test
    public void testSingletonPatternInSerialization_literalMutation3032() {
        fr.inria.diversify.testamplification.logger.Logger.writeTestStart(Thread.currentThread(),this, "testSingletonPatternInSerialization_literalMutation3032");
        final Object[] singletones = new Object[]{ ExceptionPredicate.INSTANCE , FalsePredicate.INSTANCE , NotNullPredicate.INSTANCE , NullPredicate.INSTANCE , TruePredicate.INSTANCE };
        for (final Object original : singletones) {
            org.apache.commons.collections4.TestUtils.assertSameAfterSerialization(("foo" + (original.getClass())), original);
        }
        fr.inria.diversify.testamplification.logger.Logger.writeTestFinish(Thread.currentThread());
    }

/** 
     * Test that all Predicate singletones hold singleton pattern in
     * serialization/deserialization process.
     */
@Test(timeout = 1000)
    public void testSingletonPatternInSerialization_remove2351() {
        fr.inria.diversify.testamplification.logger.Logger.writeTestStart(Thread.currentThread(),this, "testSingletonPatternInSerialization_remove2351");
        final Object[] singletones = new Object[]{ ExceptionPredicate.INSTANCE , FalsePredicate.INSTANCE , NotNullPredicate.INSTANCE , NullPredicate.INSTANCE , TruePredicate.INSTANCE };
        for (final Object original : singletones) {
        }
        fr.inria.diversify.testamplification.logger.Logger.writeTestFinish(Thread.currentThread());
    }

/**
 * Gets a Predicate that checks if the input object passed in is not null.
 *
 * @param <T>  the type that the predicate queries
 * @return the predicate
 * @see NotNullPredicate
 */
public static <T> Predicate<T> notNullPredicate() {
    return NotNullPredicate.notNullPredicate();
}

/**
 * Returns a Builder with a NotNullPredicate.
 *
 * @param <E>  the element type
 * @return a new Builder for predicated collections that ignores null values.
 * @since 4.1
 */
public static <E> Builder<E> notNullBuilder() {
    return new Builder<E>(NotNullPredicate.<E>notNullPredicate());
}

/**
 * Gets a Predicate that checks if the input object passed in is not null.
 *
 * @param <T>  the type that the predicate queries
 * @return the predicate
 * @see NotNullPredicate
 */
public static <T> Predicate<T> notNullPredicate() {
    return NotNullPredicate.notNullPredicate();
}

/**
 * Returns a Builder with a NotNullPredicate.
 *
 * @param <E>  the element type
 * @return a new Builder for predicated collections that ignores null values.
 * @since 4.1
 */
public static <E> Builder<E> notNullBuilder() {
    return new Builder<E>(NotNullPredicate.<E>notNullPredicate());
}