Main.java Source code

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Here is the source code for Main.java

Source

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

public class Main {
    /**
     * Return the first element in '<code>candidates</code>' that is contained in
     * '<code>source</code>'. If no element in '<code>candidates</code>' is present in
     * '<code>source</code>' returns <code>null</code>. Iteration order is
     * {@link Collection} implementation specific.
     * @param source the source Collection
     * @param candidates the candidates to search for
     * @return the first present object, or <code>null</code> if not found
     */
    public static Object findFirstMatch(Collection source, Collection candidates) {
        if (isEmpty(source) || isEmpty(candidates)) {
            return null;
        }
        for (Iterator it = candidates.iterator(); it.hasNext();) {
            Object candidate = it.next();
            if (source.contains(candidate)) {
                return candidate;
            }
        }
        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());
    }

    /**
     * Check whether the given Iterator contains the given element.
     * @param iterator the Iterator to check
     * @param element the element to look for
     * @return <code>true</code> if found, <code>false</code> else
     */
    public static boolean contains(Iterator iterator, Object element) {
        if (iterator != null) {
            while (iterator.hasNext()) {
                Object candidate = iterator.next();
                if (ObjectUtils.nullSafeEquals(candidate, element)) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * Check whether the given Enumeration contains the given element.
     * @param enumeration the Enumeration to check
     * @param element the element to look for
     * @return <code>true</code> if found, <code>false</code> else
     */
    public static boolean contains(Enumeration enumeration, Object element) {
        if (enumeration != null) {
            while (enumeration.hasMoreElements()) {
                Object candidate = enumeration.nextElement();
                if (ObjectUtils.nullSafeEquals(candidate, element)) {
                    return true;
                }
            }
        }
        return false;
    }
}