Java Collection Check isCollectionTypeHomogenous(final Collection collection, final Class expectedType)

Description

is Collection Type Homogenous

License

Apache License

Declaration

public static boolean isCollectionTypeHomogenous(final Collection collection, final Class expectedType) 

Method Source Code

//package com.java2s;
/*//ww w . j av  a2s. co m
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * 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;

public class Main {
    public static boolean isCollectionTypeHomogenous(final Collection collection) {
        if (collection.isEmpty()) {
            return true;
        } else {
            return isCollectionTypeHomogenous(collection, collection.iterator().next().getClass());
        }
    }

    public static boolean isCollectionTypeHomogenous(final Collection collection, final Class expectedType) {
        for (final Object object : collection) {
            if (object == null) {
                continue;
            } else if (!expectedType.isAssignableFrom(object.getClass())) {
                return false;
            }
        }
        return true;
    }
}

Related

1. isCollectionType(final Class cls)
2. isCollectionType(Object obj)
3. isCollectionType(Object obj)
4. isCollectionType(Object propertyValue)
5. isCollectionType(Object value)
6. isCompatibleTypes(Collection a, Collection b)