Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import org.springframework.util.ObjectUtils;
import java.util.*;

public class Main {
    /**
     * Find a single value of the given type in the given Collection.
     * @param collection the Collection to search
     * @param type the type to look for
     * @return a value of the given type found if there is a clear match,
     * or <code>null</code> if none or more than one such value found
     */
    public static Object findValueOfType(Collection collection, Class type) {
        if (isEmpty(collection)) {
            return null;
        }
        Object value = null;
        for (Iterator it = collection.iterator(); it.hasNext();) {
            Object obj = it.next();
            if (type == null || type.isInstance(obj)) {
                if (value != null) {
                    // More than one value found... no clear single value.
                    return null;
                }
                value = obj;
            }
        }
        return value;
    }

    /**
     * Find a single value of one of the given types in the given Collection:
     * searching the Collection for a value of the first type, then
     * searching for a value of the second type, etc.
     * @param collection the collection to search
     * @param types the types to look for, in prioritized order
     * @return a value of one of the given types found if there is a clear match,
     * or <code>null</code> if none or more than one such value found
     */
    public static Object findValueOfType(Collection collection, Class[] types) {
        if (isEmpty(collection) || ObjectUtils.isEmpty(types)) {
            return null;
        }
        for (int i = 0; i < types.length; i++) {
            Object value = findValueOfType(collection, types[i]);
            if (value != null) {
                return value;
            }
        }
        return null;
    }

    /**
     * Return <code>true</code> if the supplied Collection is <code>null</code>
     * or empty. Otherwise, return <code>false</code>.
     * @param collection the Collection to check
     * @return whether the given Collection is empty
     */
    public static boolean isEmpty(Collection collection) {
        return (collection == null || collection.isEmpty());
    }

    /**
     * Return <code>true</code> if the supplied Map is <code>null</code>
     * or empty. Otherwise, return <code>false</code>.
     * @param map the Map to check
     * @return whether the given Map is empty
     */
    public static boolean isEmpty(Map map) {
        return (map == null || map.isEmpty());
    }
}