edu.northwestern.at.utils

Class CompressedHashMap<K,V>

java.lang.Object

edu.northwestern.at.utils.CompressedHashMap<K,V>

All Implemented Interfaces:

java.util.Map<K,V>

public class CompressedHashMap<K,V>
extends java.lang.Object
implements java.util.Map<K,V>

A hash map which stores its values in compressed form.

Nested Class Summary

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

java.util.Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.HashMap<K,java.lang.Object>	delegateMap The delagated-to hash map used to store the compressed values.
protected static CompressedSerializer	serializer The object compressor for the values in the hash map.

Constructor Summary

Constructors

Constructor and Description
CompressedHashMap() Create hash map.
CompressedHashMap(int initialCapacity) Create hash map with specified initial capacity.
CompressedHashMap(int initialCapacity, float loadFactor) Create hash map with specified initial capacity and load factor.
CompressedHashMap(java.util.Map<? extends K,? extends V> map) Create hash map from another map.

Method Summary

Methods

Modifier and Type	Method and Description
void	clear()
java.lang.Object	clone()
protected java.lang.Object	compress(java.lang.Object o)
boolean	containsKey(java.lang.Object key)
boolean	containsValue(java.lang.Object value)
protected V	decompress(java.lang.Object o)
java.util.Set<java.util.Map.Entry<K,V>>	entrySet()
V	get(java.lang.Object key)
boolean	isEmpty()
java.util.Set<K>	keySet()
V	put(K key, V value)
void	putAll(java.util.Map<? extends K,? extends V> m)
V	remove(java.lang.Object key)
int	size()
java.util.Collection<V>	values()

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Map

equals, hashCode

Field Detail

serializer

protected static CompressedSerializer serializer

The object compressor for the values in the hash map.

delegateMap

protected java.util.HashMap<K,java.lang.Object> delegateMap

The delagated-to hash map used to store the compressed values.

Constructor Detail

CompressedHashMap

public CompressedHashMap()

Create hash map.

CompressedHashMap

public CompressedHashMap(int initialCapacity)

Create hash map with specified initial capacity.

Parameters:

initialCapacity - The initial capacity.

CompressedHashMap

public CompressedHashMap(int initialCapacity,
                 float loadFactor)

Create hash map with specified initial capacity and load factor.

Parameters:

initialCapacity - The initial capacity.

loadFactor - The load factor.

CompressedHashMap

public CompressedHashMap(java.util.Map<? extends K,? extends V> map)

Create hash map from another map.

Parameters:

map - The other map from which to load entries.

Method Detail

decompress

protected V decompress(java.lang.Object o)

compress

protected java.lang.Object compress(java.lang.Object o)

clear

public void clear()
           throws java.lang.UnsupportedOperationException

Specified by:

clear in interface java.util.Map<K,V>

Throws:

java.lang.UnsupportedOperationException

clone

public java.lang.Object clone()

Overrides:

clone in class java.lang.Object

containsKey

public boolean containsKey(java.lang.Object key)
                    throws java.lang.ClassCastException,
                           java.lang.NullPointerException

Specified by:

containsKey in interface java.util.Map<K,V>

Throws:

java.lang.ClassCastException

java.lang.NullPointerException

containsValue

public boolean containsValue(java.lang.Object value)
                      throws java.lang.ClassCastException,
                             java.lang.NullPointerException

Specified by:

containsValue in interface java.util.Map<K,V>

Throws:

java.lang.ClassCastException

java.lang.NullPointerException

entrySet

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

Specified by:

entrySet in interface java.util.Map<K,V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Map<K,V>

keySet

public java.util.Set<K> keySet()

Specified by:

keySet in interface java.util.Map<K,V>

size

public int size()

Specified by:

size in interface java.util.Map<K,V>

putAll

public void putAll(java.util.Map<? extends K,? extends V> m)
            throws java.lang.UnsupportedOperationException,
                   java.lang.ClassCastException,
                   java.lang.NullPointerException,
                   java.lang.IllegalArgumentException

Specified by:

putAll in interface java.util.Map<K,V>

Throws:

java.lang.UnsupportedOperationException

java.lang.ClassCastException

java.lang.NullPointerException

java.lang.IllegalArgumentException

values

public java.util.Collection<V> values()

Specified by:

values in interface java.util.Map<K,V>

remove

public V remove(java.lang.Object key)
         throws java.lang.UnsupportedOperationException,
                java.lang.ClassCastException,
                java.lang.NullPointerException

Specified by:

remove in interface java.util.Map<K,V>

Throws:

java.lang.UnsupportedOperationException

java.lang.ClassCastException

java.lang.NullPointerException

get

public V get(java.lang.Object key)
      throws java.lang.ClassCastException,
             java.lang.NullPointerException

Specified by:

get in interface java.util.Map<K,V>

Throws:

java.lang.ClassCastException

java.lang.NullPointerException

put

public V put(K key,
    V value)
      throws java.lang.UnsupportedOperationException,
             java.lang.ClassCastException,
             java.lang.NullPointerException,
             java.lang.IllegalArgumentException

Specified by:

put in interface java.util.Map<K,V>

Throws:

java.lang.UnsupportedOperationException

java.lang.ClassCastException

java.lang.NullPointerException

java.lang.IllegalArgumentException