JAVA MAPS UTILITY

public class Maps {

/**
* Checks whether the map is {@code null} or empty
* @param map a nullable map
* @return true if map is either {@code null} or empty, false otherwise
*/
public static boolean isNullOrEmpty(Map<?, ?> map) {
return map == null || map.isEmpty();
}

/**
* Before JDK 7, constructing new generic collections requires unpleasant code duplication:
* {@code Map<TypeThatsTooLongForItsOwnGood, AnotherTypeThatsTooLong> map =
* new HashMap<TypeThatsTooLongForItsOwnGood, AnotherTypeThatsTooLong>();}
*
* <p>But using these static factory methods, the type on the right side is automatically inferred:
* {@code Map<TypeThatsTooLongForItsOwnGood, AnotherTypeThatsTooLong> map = Maps.newHashMap();}
* @return a new empty {@code HashMap}
*/
public static <K, V> HashMap<K, V> newHashMap() {
return new HashMap<K, V>();
}

/**
* Before JDK 7, constructing new generic collections requires unpleasant code duplication:
* {@code Map<TypeThatsTooLongForItsOwnGood, AnotherTypeThatsTooLong> map =
* new LinkedHashMap<TypeThatsTooLongForItsOwnGood, AnotherTypeThatsTooLong>();}
*
* <p>But using these static factory methods, the type on the right side is automatically inferred:
* {@code Map<TypeThatsTooLongForItsOwnGood, AnotherTypeThatsTooLong> map = Maps.newLinkedHashMap();}
* @return a new empty {@code LinkedHashMap}
*/
public static <K, V> HashMap<K, V> newLinkedHashMap() {
return new LinkedHashMap<K, V>();
}
}