org.apache.ode.utils

Class CollectionUtils

java.lang.Object

org.apache.ode.utils.CollectionUtils

public class CollectionUtils
extends java.lang.Object

Utility class for dealing with arrays.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.Class[]	EMPTY_CLASS_ARRAY
static java.lang.Object[]	EMPTY_OBJECT_ARRAY

Constructor Summary

Constructors

Constructor and Description
CollectionUtils()

Method Summary

Modifier and Type	Method and Description
static boolean	equals(java.util.Map m1, java.util.Map m2) Compares the two specified maps for equality.
static <T> java.util.Collection<T>	makeCollection(java.lang.Class<? extends java.util.Collection> type, T[] elements) Make a Collection out of an array.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

EMPTY_OBJECT_ARRAY

public static final java.lang.Object[] EMPTY_OBJECT_ARRAY

EMPTY_CLASS_ARRAY

public static final java.lang.Class[] EMPTY_CLASS_ARRAY

Constructor Detail

CollectionUtils

public CollectionUtils()

Method Detail

makeCollection

public static <T> java.util.Collection<T> makeCollection(java.lang.Class<? extends java.util.Collection> type,
                                                         T[] elements)

Make a Collection out of an array.

Parameters:

type - the type of Collection to make.

elements - objects to put into the collection.

Returns:

a Collection of the type given in the type argument containing elements

equals

public static boolean equals(java.util.Map m1,
                             java.util.Map m2)

Compares the two specified maps for equality. Returns true if the two maps represent the same mappings. More formally, two maps m1 and m2 represent the same mappings if m1.keySet().equals(m2.keySet()) and for every key k in m1.keySet(), (m1.get(k)==null ? m2.get(k)==null : m1.get(k).equals(m2.get(k))) .

This implementation first checks if the m1 and m2 are the same object; if so it returns true. Then, it checks if the two maps have the same sizw; if not, it returns false. If so, it iterates over m1's entrySet collection, and checks that map m1 contains each mapping that map m2 contains. If map m1 fails to contain such a mapping, false is returned. If the iteration completes, true is returned.

Returns:

true if the specified object is equal to this map.