org.apache.openjpa.lib.util.collections

Class AbstractMapEntry<K,V>

java.lang.Object

org.apache.openjpa.lib.util.collections.AbstractKeyValue<K,V>

org.apache.openjpa.lib.util.collections.AbstractMapEntry<K,V>

Type Parameters:

K - the type of keys

V - the type of mapped values

All Implemented Interfaces:

Map.Entry<K,V>, KeyValue<K,V>

Direct Known Subclasses:

DefaultMapEntry, UnmodifiableMapEntry

public abstract class AbstractMapEntry<K,V>
extends AbstractKeyValue<K,V>
implements Map.Entry<K,V>

Abstract Pair class to assist with creating correct Map.Entry implementations.

Since:

3.0

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractMapEntry(K key, V value) Constructs a new entry with the given key and given value.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj) Compares this Map.Entry with another Map.Entry.
int	hashCode() Gets a hashCode compatible with the equals method.
V	setValue(V value) Sets the value stored in this Map.Entry.

Methods inherited from class org.apache.openjpa.lib.util.collections.AbstractKeyValue

getKey, getValue, setKey, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map.Entry

comparingByKey, comparingByKey, comparingByValue, comparingByValue, getKey, getValue

Constructor Detail

AbstractMapEntry

protected AbstractMapEntry(K key,
                           V value)

Constructs a new entry with the given key and given value.

Parameters:

key - the key for the entry, may be null

value - the value for the entry, may be null

Method Detail

setValue

public V setValue(V value)

Sets the value stored in this Map.Entry.

This Map.Entry is not connected to a Map, so only the local data is changed.

Specified by:

setValue in interface Map.Entry<K,V>

Overrides:

setValue in class AbstractKeyValue<K,V>

Parameters:

value - the new value

Returns:

the previous value

equals

public boolean equals(Object obj)

Compares this Map.Entry with another Map.Entry.

Implemented per API documentation of Map.Entry#equals(Object)

Specified by:

equals in interface Map.Entry<K,V>

Overrides:

equals in class Object

Parameters:

obj - the object to compare to

Returns:

true if equal key and value

hashCode

public int hashCode()

Gets a hashCode compatible with the equals method.

Implemented per API documentation of Map.Entry#hashCode()

Specified by:

hashCode in interface Map.Entry<K,V>

Overrides:

hashCode in class Object

Returns:

a suitable hash code