Package org.apache.openjpa.lib.util.collections

Class UnmodifiableOrderedMap<K,V>

java.lang.Object

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

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

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

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

Type Parameters:

K - the type of the keys in this map

V - the type of the values in this map

All Implemented Interfaces:

Serializable, Map<K,V>, IterableMap<K,V>, OrderedMap<K,V>, Unmodifiable

public final class UnmodifiableOrderedMap<K,V>
extends AbstractOrderedMapDecorator<K,V>
implements Unmodifiable, Serializable

Decorates another OrderedMap to ensure it can't be altered.

This class is Serializable from Commons Collections 3.1.

Attempts to modify it will result in an UnsupportedOperationException.

Since:

3.0

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K extends Object,V extends Object>

Method Summary

Modifier and Type	Method	Description
void	clear()
Set<Map.Entry<K,V>>	entrySet()
Set<K>	keySet()
OrderedMapIterator<K,V>	mapIterator()	Obtains a MapIterator over the map.
V	put(K key, V value)	Note that the return type is Object, rather than V as in the Map interface.
void	putAll(Map<? extends K,? extends V> mapToCopy)
V	remove(Object key)
static <K, V> OrderedMap<K,V>	unmodifiableOrderedMap(OrderedMap<? extends K,? extends V> map)	Factory method to create an unmodifiable sorted map.
Collection<V>	values()

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

decorated, firstKey, lastKey, nextKey, previousKey

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

containsKey, containsValue, equals, get, hashCode, isEmpty, size, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, equals, forEach, get, getOrDefault, hashCode, isEmpty, merge, putIfAbsent, remove, replace, replace, replaceAll, size

Method Details

unmodifiableOrderedMap

public static <K,
V> OrderedMap<K,V> unmodifiableOrderedMap(OrderedMap<? extends K,? extends V> map)

Factory method to create an unmodifiable sorted map.

Type Parameters:

K - the key type

V - the value type

Parameters:

map - the map to decorate, must not be null

Returns:

a new ordered map

Throws:

NullPointerException - if map is null

Since:

4.0

mapIterator

public OrderedMapIterator<K,V> mapIterator()

Description copied from class: AbstractIterableMap

Obtains a MapIterator over the map.

A map iterator is an efficient way of iterating over maps. There is no need to access the entry set or use Map Entry objects.

 IterableMap<String,Integer> map = new HashedMap<String,Integer>();
 MapIterator<String,Integer> it = map.mapIterator();
 while (it.hasNext()) {
   String key = it.next();
   Integer value = it.getValue();
   it.setValue(value + 1);
 }
 

Specified by:

mapIterator in interface IterableMap<K,V>

Specified by:

mapIterator in interface OrderedMap<K,V>

Overrides:

mapIterator in class AbstractOrderedMapDecorator<K,V>

Returns:

a map iterator

clear

public void clear()

Specified by:

clear in interface IterableMap<K,V>

Specified by:

clear in interface Map<K,V>

Overrides:

clear in class AbstractMapDecorator<K,V>

See Also:

• Map.clear()

put

public V put(K key,
 V value)

Description copied from interface: IterableMap

Note that the return type is Object, rather than V as in the Map interface. See the class Javadoc for further info.

Specified by:

put in interface IterableMap<K,V>

Specified by:

put in interface Map<K,V>

Overrides:

put in class AbstractMapDecorator<K,V>

Parameters:

key - key with which the specified value is to be associated

value - value to be associated with the specified key

Returns:

the previous value associated with key, or null if there was no mapping for key. (A null return can also indicate that the map previously associated null with key, if the implementation supports null values.)

See Also:

• Map.put(Object, Object)

putAll

public void putAll(Map<? extends K,? extends V> mapToCopy)

Specified by:

putAll in interface IterableMap<K,V>

Specified by:

putAll in interface Map<K,V>

Overrides:

putAll in class AbstractMapDecorator<K,V>

Parameters:

mapToCopy - mappings to be stored in this map

See Also:

• Map.putAll(Map)

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

Overrides:

remove in class AbstractMapDecorator<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<K,V>

Overrides:

entrySet in class AbstractMapDecorator<K,V>

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K,V>

Overrides:

keySet in class AbstractMapDecorator<K,V>

values

public Collection<V> values()

Specified by:

values in interface Map<K,V>

Overrides:

values in class AbstractMapDecorator<K,V>