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java.lang.Object java.util.AbstractMap<K,V> org.apache.commons.collections.map.AbstractHashedMap<K,V> org.apache.commons.collections.map.IdentityMap<K,V>
public class IdentityMap<K,V>
A Map
implementation that matches keys and values based
on ==
not equals()
.
Nested Class Summary | |
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protected static class |
IdentityMap.IdentityEntry<K,V>
HashEntry |
Nested classes/interfaces inherited from class org.apache.commons.collections.map.AbstractHashedMap |
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AbstractHashedMap.EntrySet<K,V>, AbstractHashedMap.EntrySetIterator<K,V>, AbstractHashedMap.HashEntry<K,V>, AbstractHashedMap.HashIterator<K,V>, AbstractHashedMap.HashMapIterator<K,V>, AbstractHashedMap.KeySet<K,V>, AbstractHashedMap.KeySetIterator<K,V>, AbstractHashedMap.Values<K,V>, AbstractHashedMap.ValuesIterator<K,V> |
Nested classes/interfaces inherited from interface java.util.Map |
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Map.Entry<K,V> |
Field Summary |
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Fields inherited from class org.apache.commons.collections.map.AbstractHashedMap |
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data, DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR, DEFAULT_THRESHOLD, entrySet, GETKEY_INVALID, GETVALUE_INVALID, keySet, loadFactor, MAXIMUM_CAPACITY, modCount, NO_NEXT_ENTRY, NO_PREVIOUS_ENTRY, NULL, REMOVE_INVALID, SETVALUE_INVALID, size, threshold, values |
Constructor Summary | |
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IdentityMap()
Constructs a new empty map with default size and load factor. |
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IdentityMap(int initialCapacity)
Constructs a new, empty map with the specified initial capacity. |
|
IdentityMap(int initialCapacity,
float loadFactor)
Constructs a new, empty map with the specified initial capacity and load factor. |
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IdentityMap(Map<? extends K,? extends V> map)
Constructor copying elements from another map. |
Method Summary | |
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Object |
clone()
Clones the map without cloning the keys or values. |
protected AbstractHashedMap.HashEntry<K,V> |
createEntry(AbstractHashedMap.HashEntry<K,V> next,
int hashCode,
K key,
V value)
Creates an entry to store the data. |
protected int |
hash(Object key)
Gets the hash code for the key specified. |
protected boolean |
isEqualKey(Object key1,
Object key2)
Compares two keys for equals. |
protected boolean |
isEqualValue(Object value1,
Object value2)
Compares two values for equals. |
Methods inherited from class org.apache.commons.collections.map.AbstractHashedMap |
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addEntry, addMapping, calculateNewCapacity, calculateThreshold, checkCapacity, clear, containsKey, containsValue, createEntrySetIterator, createKeySetIterator, createValuesIterator, destroyEntry, doReadObject, doWriteObject, ensureCapacity, entryHashCode, entryKey, entryNext, entrySet, entryValue, equals, get, getEntry, hashCode, hashIndex, init, isEmpty, keySet, mapIterator, put, putAll, remove, removeEntry, removeMapping, reuseEntry, size, toString, updateEntry, values |
Methods inherited from class java.lang.Object |
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finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public IdentityMap()
public IdentityMap(int initialCapacity)
initialCapacity
- the initial capacity
IllegalArgumentException
- if the initial capacity is less than onepublic IdentityMap(int initialCapacity, float loadFactor)
initialCapacity
- the initial capacityloadFactor
- the load factor
IllegalArgumentException
- if the initial capacity is less than one
IllegalArgumentException
- if the load factor is less than zeropublic IdentityMap(Map<? extends K,? extends V> map)
map
- the map to copy
NullPointerException
- if the map is nullMethod Detail |
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protected int hash(Object key)
hash
in class AbstractHashedMap<K,V>
key
- the key to get a hash code for
protected boolean isEqualKey(Object key1, Object key2)
==
.
isEqualKey
in class AbstractHashedMap<K,V>
key1
- the first key to comparekey2
- the second key to compare
protected boolean isEqualValue(Object value1, Object value2)
==
.
isEqualValue
in class AbstractHashedMap<K,V>
value1
- the first value to comparevalue2
- the second value to compare
protected AbstractHashedMap.HashEntry<K,V> createEntry(AbstractHashedMap.HashEntry<K,V> next, int hashCode, K key, V value)
createEntry
in class AbstractHashedMap<K,V>
next
- the next entry in sequencehashCode
- the hash code to usekey
- the key to storevalue
- the value to store
public Object clone()
clone
in class AbstractHashedMap<K,V>
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