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IdentityMap - JBoss RULES 3.0.6 API 英文版文档

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org.drools.util
Class IdentityMap

java.lang.Object
  java.util.AbstractMap
      org.drools.util.AbstractHashedMap
          org.drools.util.IdentityMap

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.util.Map

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public class IdentityMap
extends AbstractHashedMap
implements java.io.Serializable, java.lang.Cloneable

A Map implementation that matches keys and values based on == not equals().

This map will violate the detail of various Map and map view contracts. As a general rule, don't compare this map to other maps.

Since:

Commons Collections 3.0

See Also:

Serialized Form

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Nested Class Summary
protected static class	IdentityMap.IdentityEntry           HashEntry

 

Nested classes/interfaces inherited from class org.drools.util.AbstractHashedMap
AbstractHashedMap.EntrySet, AbstractHashedMap.EntrySetIterator, AbstractHashedMap.HashEntry, AbstractHashedMap.HashIterator, AbstractHashedMap.HashMapIterator, AbstractHashedMap.KeySet, AbstractHashedMap.KeySetIterator, AbstractHashedMap.Values, AbstractHashedMap.ValuesIterator

 

Nested classes/interfaces inherited from interface java.util.Map
java.util.Map.Entry<K,V>

 

Field Summary

 

Fields inherited from class org.drools.util.AbstractHashedMap
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
IdentityMap()           Constructs a new empty map with default size and load factor.
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.
IdentityMap(java.util.Map map)           Constructor copying elements from another map.

 

Method Summary
java.lang.Object	clone()           Clones the map without cloning the keys or values.
protected  AbstractHashedMap.HashEntry	createEntry(AbstractHashedMap.HashEntry next, int hashCode, java.lang.Object key, java.lang.Object value)           Creates an entry to store the data.
protected  int	hash(java.lang.Object key)           Gets the hash code for the key specified.
protected  boolean	isEqualKey(java.lang.Object key1, java.lang.Object key2)           Compares two keys for equals.
protected  boolean	isEqualValue(java.lang.Object value1, java.lang.Object value2)           Compares two values for equals.

 

Methods inherited from class org.drools.util.AbstractHashedMap

addEntry, addMapping, calculateNewCapacity, calculateThreshold, checkCapacity, clear, containsKey, containsValue, convertKey, createEntrySetIterator, createKeySetIterator, createValuesIterator, destroyEntry, doReadObject, doWriteObject, ensureCapacity, entryHashCode, entryKey, entryNext, entrySet, entryValue, equals, get, getEntry, hashCode, hashIndex, init, isEmpty, keySet, put, putAll, remove, removeEntry, removeMapping, reuseEntry, size, toString, updateEntry, values

 

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

 

Constructor Detail

IdentityMap

public IdentityMap()

Constructs a new empty map with default size and load factor.

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IdentityMap

public IdentityMap(int initialCapacity)

Constructs a new, empty map with the specified initial capacity.

Parameters:

initialCapacity - the initial capacity

Throws:

java.lang.IllegalArgumentException - if the initial capacity is less than one

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IdentityMap

public IdentityMap(int initialCapacity,
                   float loadFactor)

Constructs a new, empty map with the specified initial capacity and load factor.

Parameters:

initialCapacity - the initial capacity

loadFactor - the load factor

Throws:

java.lang.IllegalArgumentException - if the initial capacity is less than one

java.lang.IllegalArgumentException - if the load factor is less than zero

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IdentityMap

public IdentityMap(java.util.Map map)

Constructor copying elements from another map.

Parameters:

map - the map to copy

Throws:

java.lang.NullPointerException - if the map is null

Method Detail

hash

protected int hash(java.lang.Object key)

Gets the hash code for the key specified. This implementation uses the identity hash code.

Overrides:

hash in class AbstractHashedMap

Parameters:

key - the key to get a hash code for

Returns:

the hash code

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isEqualKey

protected boolean isEqualKey(java.lang.Object key1,
                             java.lang.Object key2)

Compares two keys for equals. This implementation uses ==.

Overrides:

isEqualKey in class AbstractHashedMap

Parameters:

key1 - the first key to compare

key2 - the second key to compare

Returns:

true if equal by identity

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isEqualValue

protected boolean isEqualValue(java.lang.Object value1,
                               java.lang.Object value2)

Compares two values for equals. This implementation uses ==.

Overrides:

isEqualValue in class AbstractHashedMap

Parameters:

value1 - the first value to compare

value2 - the second value to compare

Returns:

true if equal by identity

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createEntry

protected AbstractHashedMap.HashEntry createEntry(AbstractHashedMap.HashEntry next,
                                                  int hashCode,
                                                  java.lang.Object key,
                                                  java.lang.Object value)

Creates an entry to store the data. This implementation creates an IdentityEntry instance.

Overrides:

createEntry in class AbstractHashedMap

Parameters:

next - the next entry in sequence

hashCode - the hash code to use

key - the key to store

value - the value to store

Returns:

the newly created entry

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clone

public java.lang.Object clone()

Clones the map without cloning the keys or values.

Overrides:

clone in class AbstractHashedMap

Returns:

a shallow clone

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