find Value Of Type from Collection - Android java.util

Android examples for java.util:Collection Find

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Description

find Value Of Type from Collection

Demo Code

/*/*from   w w w. ja  va2s .  c o  m*/
 * Copyright 2002-2008 the original author or authors.
 *
 * 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.Arrays;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;

public class Main{
    public static void main(String[] argv){
        Collection collection = java.util.Arrays.asList("asdf","book2s.com");
        Class type = String.class;
        System.out.println(findValueOfType(collection,type));
    }
    @SuppressWarnings("unchecked")
    public static <T> T findValueOfType(Collection collection, Class<T> type) {
        if (isEmpty(collection)) {
            return null;
        }
        T value = null;
        for (Object element : collection) {
            if (type == null || type.isInstance(element)) {
                if (value != null) {
                    // More than one value found... no clear single value.
                    return null;
                }
                value = (T) element;
            }
        }
        return value;
    }
    public static Object findValueOfType(Collection<?> collection,
            Class<?>[] types) {
        if (isEmpty(collection) || ObjectUtil.isEmpty(types)) {
            return null;
        }
        for (Class<?> type : types) {
            Object value = findValueOfType(collection, type);
            if (value != null) {
                return value;
            }
        }
        return null;
    }
    public static boolean isEmpty(Collection<?> collection) {
        return (collection == null || collection.isEmpty());
    }
    public static boolean isEmpty(Map<?, ?> map) {
        return (map == null || map.isEmpty());
    }
}

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