Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/**
 * Copyright (C) 2014-2017 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.Collection;

import java.util.Map;

import java.util.function.Predicate;

import javax.annotation.Nullable;

public class Main {
    /**
     * Check if the passed collection contains only elements matching the
     * predicate. An empty collection does not fulfill this requirement! If no
     * filter is provided the return value is identical to
     * {@link #isNotEmpty(Iterable)}
     *
     * @param aCollection
     *        The collection to check. May be <code>null</code>.
     * @param aFilter
     *        Predicate to check against all elements. May not be
     *        <code>null</code>.
     * @return <code>true</code> only if the passed collection is neither
     *         <code>null</code> nor empty and if only matching elements are
     *         contained, or if no filter is provided and the collection is not
     *         empty.
     * @param <ELEMENTTYPE>
     *        Collection data type
     */
    public static <ELEMENTTYPE> boolean containsOnly(@Nullable final Iterable<? extends ELEMENTTYPE> aCollection,
            @Nullable final Predicate<? super ELEMENTTYPE> aFilter) {
        if (isEmpty(aCollection))
            return false;

        if (aFilter == null)
            return isNotEmpty(aCollection);

        for (final ELEMENTTYPE aElement : aCollection)
            if (!aFilter.test(aElement))
                return false;
        return true;
    }

    public static boolean isEmpty(@Nullable final Iterable<?> aCont) {
        return aCont == null || !aCont.iterator().hasNext();
    }

    public static boolean isEmpty(@Nullable final Collection<?> aCont) {
        return aCont == null || aCont.isEmpty();
    }

    public static boolean isEmpty(@Nullable final Map<?, ?> aCont) {
        return aCont == null || aCont.isEmpty();
    }

    public static boolean isNotEmpty(@Nullable final Iterable<?> aCont) {
        return aCont != null && aCont.iterator().hasNext();
    }

    public static boolean isNotEmpty(@Nullable final Collection<?> aCont) {
        return aCont != null && !aCont.isEmpty();
    }

    public static boolean isNotEmpty(@Nullable final Map<?, ?> aCont) {
        return aCont != null && !aCont.isEmpty();
    }
}