Package de.intarsys.tools.collection
Class PartitionedMap
java.lang.Object
de.intarsys.tools.collection.PartitionedMap
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Map
A map that wraps two other maps.
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Nested Class Summary
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
clear()
Removes all mappings from this map (optional operation).boolean
containsKey
(Object key) Returns true if this map contains a mapping for the specified key.boolean
containsValue
(Object value) Returns true if this map maps one or more keys to the specified value.static Map
entrySet()
Returns a set view of the mappings contained in this map.Returns the value to which this map maps the specified key.protected Map
getChild()
boolean
isEmpty()
Returns true if this map contains no key-value mappings.keySet()
Returns a set view of the keys contained in this map.Associates the specified value with the specified key in this map (optional operation).void
Copies all of the mappings from the specified map to this map (optional operation).Removes the mapping for this key from this map if present (optional operation).void
int
size()
Returns the number of key-value mappings in this map.toString()
values()
Returns a collection view of the values contained in this map.Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, equals, forEach, getOrDefault, hashCode, merge, putIfAbsent, remove, replace, replace, replaceAll
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Constructor Details
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PartitionedMap
public PartitionedMap() -
PartitionedMap
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Method Details
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create
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clear
public void clear()Removes all mappings from this map (optional operation). -
containsKey
Returns true if this map contains a mapping for the specified key.- Specified by:
containsKey
in interfaceMap
- Parameters:
key
- key whose presence in this map is to be tested.- Returns:
- true if this map contains a mapping for the specified key.
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containsValue
Returns true if this map maps one or more keys to the specified value. More formally, returns true if and only if this map contains at least one mapping to a value v such that (value==null ? v==null : value.equals(v)). This operation will probably require time linear in the map size for most implementations of the Map interface.- Specified by:
containsValue
in interfaceMap
- Parameters:
value
- value whose presence in this map is to be tested.- Returns:
- true if this map maps one or more keys to the specified value.
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entrySet
Returns a set view of the mappings contained in this map. Each element in the returned set is a Map.Entry. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress, the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations. -
get
Returns the value to which this map maps the specified key. Returns null if the map contains no mapping for this key. A return value of null does not necessarily indicate that the map contains no mapping for the key; it's also possible that the map explicitly maps the key to null. The containsKey operation may be used to distinguish these two cases. -
getChild
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getParent
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isEmpty
public boolean isEmpty()Returns true if this map contains no key-value mappings. -
keySet
Returns a set view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress, the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAllretainAll, and clear operations. It does not support the add or addAll operations. -
put
Associates the specified value with the specified key in this map (optional operation). If the map previously contained a mapping for this key, the old value is replaced.- Specified by:
put
in interfaceMap
- Parameters:
key
- key with which the specified value is to be associated.value
- value to be associated with the specified key.- Returns:
- previous value associated with specified key, or null if there was no mapping for key. A null return can also indicate that the map previously associated null with the specified key, if the implementation supports null values.
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putAll
Copies all of the mappings from the specified map to this map (optional operation). These mappings will replace any mappings that this map had for any of the keys currently in the specified map. -
remove
Removes the mapping for this key from this map if present (optional operation).- Specified by:
remove
in interfaceMap
- Parameters:
key
- key whose mapping is to be removed from the map.- Returns:
- previous value associated with specified key, or null if there was no mapping for key. A null return can also indicate that the map previously associated null with the specified key, if the implementation supports null values.
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setParent
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size
public int size()Returns the number of key-value mappings in this map. If the map contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE. -
toString
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values
Returns a collection view of the values contained in this map. The collection is backed by the map, so changes to the map are reflected in the collection, and vice-versa. If the map is modified while an iteration over the collection is in progress, the results of the iteration are undefined. The collection supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Collection.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.
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