org.columba.ristretto.message

Class IgnoreCaseHashtable<V>

java.lang.Object

java.util.Dictionary<java.lang.String,V>

org.columba.ristretto.message.IgnoreCaseHashtable<V>

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.util.Map<java.lang.String,V>

public class IgnoreCaseHashtable<V>
extends java.util.Dictionary<java.lang.String,V>
implements java.util.Map<java.lang.String,V>, java.lang.Cloneable, java.io.Serializable

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
IgnoreCaseHashtable() Constructs a new, empty hashtable with a default initial capacity (11) and load factor (0.75).
IgnoreCaseHashtable(int initialCapacity) Constructs a new, empty hashtable with the specified initial capacity and default load factor (0.75).
IgnoreCaseHashtable(int initialCapacity, float loadFactor) Constructs a new, empty hashtable with the specified initial capacity and the specified load factor.
IgnoreCaseHashtable(java.util.Map<? extends java.lang.String,? extends V> t) Constructs a new hashtable with the same mappings as the given Map.

Method Summary

Modifier and Type	Method and Description
void	clear() Clears this hashtable so that it contains no keys.
java.lang.Object	clone() Creates a shallow copy of this hashtable.
boolean	contains(java.lang.Object value) Tests if some key maps into the specified value in this hashtable.
boolean	containsKey(java.lang.Object key) Tests if the specified object is a key in this hashtable.
boolean	containsValue(java.lang.Object value) Returns true if this hashtable maps one or more keys to this value.
java.util.Enumeration<V>	elements() Returns an enumeration of the values in this hashtable.
java.util.Set<java.util.Map.Entry<java.lang.String,V>>	entrySet() Returns a Set view of the mappings contained in this map.
boolean	equals(java.lang.Object o) Compares the specified Object with this Map for equality, as per the definition in the Map interface.
V	get(java.lang.Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
int	hashCode() Returns the hash code value for this Map as per the definition in the Map interface.
boolean	isEmpty() Tests if this hashtable maps no keys to values.
java.util.Enumeration<java.lang.String>	keys() Returns an enumeration of the keys in this hashtable.
java.util.Set<java.lang.String>	keySet() Returns a Set view of the keys contained in this map.
V	put(java.lang.String key, V value) Maps the specified key to the specified value in this hashtable.
void	putAll(java.util.Map<? extends java.lang.String,? extends V> t) Copies all of the mappings from the specified map to this hashtable.
protected void	rehash() Increases the capacity of and internally reorganizes this hashtable, in order to accommodate and access its entries more efficiently.
V	remove(java.lang.Object key) Removes the key (and its corresponding value) from this hashtable.
int	size() Returns the number of keys in this hashtable.
java.lang.String	toString() Returns a string representation of this Hashtable object in the form of a set of entries, enclosed in braces and separated by the ASCII characters ", " (comma and space).
java.util.Collection<V>	values() Returns a Collection view of the values contained in this map.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Constructor Detail

IgnoreCaseHashtable

public IgnoreCaseHashtable(int initialCapacity,
                           float loadFactor)

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

Parameters:

initialCapacity - the initial capacity of the hashtable.

loadFactor - the load factor of the hashtable.

Throws:

java.lang.IllegalArgumentException - if the initial capacity is less than zero, or if the load factor is nonpositive.

IgnoreCaseHashtable

public IgnoreCaseHashtable(int initialCapacity)

Constructs a new, empty hashtable with the specified initial capacity and default load factor (0.75).

Parameters:

initialCapacity - the initial capacity of the hashtable.

Throws:

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

IgnoreCaseHashtable

public IgnoreCaseHashtable()

Constructs a new, empty hashtable with a default initial capacity (11) and load factor (0.75).

IgnoreCaseHashtable

public IgnoreCaseHashtable(java.util.Map<? extends java.lang.String,? extends V> t)

Constructs a new hashtable with the same mappings as the given Map. The hashtable is created with an initial capacity sufficient to hold the mappings in the given Map and a default load factor (0.75).

Parameters:

t - the map whose mappings are to be placed in this map.

Throws:

java.lang.NullPointerException - if the specified map is null.

Since:

1.2

Method Detail

size

public int size()

Returns the number of keys in this hashtable.

Specified by:

size in interface java.util.Map<java.lang.String,V>

Specified by:

size in class java.util.Dictionary<java.lang.String,V>

Returns:

the number of keys in this hashtable.

isEmpty

public boolean isEmpty()

Tests if this hashtable maps no keys to values.

Specified by:

isEmpty in interface java.util.Map<java.lang.String,V>

Specified by:

isEmpty in class java.util.Dictionary<java.lang.String,V>

Returns:

true if this hashtable maps no keys to values; false otherwise.

keys

public java.util.Enumeration<java.lang.String> keys()

Returns an enumeration of the keys in this hashtable.

Specified by:

keys in class java.util.Dictionary<java.lang.String,V>

Returns:

an enumeration of the keys in this hashtable.

See Also:

Enumeration, elements(), keySet(), Map

elements

public java.util.Enumeration<V> elements()

Returns an enumeration of the values in this hashtable. Use the Enumeration methods on the returned object to fetch the elements sequentially.

Specified by:

elements in class java.util.Dictionary<java.lang.String,V>

Returns:

an enumeration of the values in this hashtable.

See Also:

Enumeration, keys(), values(), Map

contains

public boolean contains(java.lang.Object value)

Tests if some key maps into the specified value in this hashtable. This operation is more expensive than the containsKey method.

Note that this method is identical in functionality to containsValue, (which is part of the Map interface in the collections framework).

Parameters:

value - a value to search for

Returns:

true if and only if some key maps to the value argument in this hashtable as determined by the equals method; false otherwise.

Throws:

java.lang.NullPointerException - if the value is null

containsValue

public boolean containsValue(java.lang.Object value)

Returns true if this hashtable maps one or more keys to this value.

Note that this method is identical in functionality to contains (which predates the Map interface).

Specified by:

containsValue in interface java.util.Map<java.lang.String,V>

Parameters:

value - value whose presence in this hashtable is to be tested

Returns:

true if this map maps one or more keys to the specified value

Throws:

java.lang.NullPointerException - if the value is null

Since:

1.2

containsKey

public boolean containsKey(java.lang.Object key)

Tests if the specified object is a key in this hashtable.

Specified by:

containsKey in interface java.util.Map<java.lang.String,V>

Parameters:

key - possible key

Returns:

true if and only if the specified object is a key in this hashtable, as determined by the equals method; false otherwise.

Throws:

java.lang.NullPointerException - if the key is null

See Also:

contains(Object)

get

public V get(java.lang.Object key)

Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.

More formally, if this map contains a mapping from a key k to a value v such that (key.equals(k)), then this method returns v; otherwise it returns null. (There can be at most one such mapping.)

Specified by:

get in interface java.util.Map<java.lang.String,V>

Specified by:

get in class java.util.Dictionary<java.lang.String,V>

Parameters:

key - the key whose associated value is to be returned

Returns:

the value to which the specified key is mapped, or null if this map contains no mapping for the key

Throws:

java.lang.NullPointerException - if the specified key is null

See Also:

Dictionary.put(Object, Object)

rehash

protected void rehash()

Increases the capacity of and internally reorganizes this hashtable, in order to accommodate and access its entries more efficiently. This method is called automatically when the number of keys in the hashtable exceeds this hashtable's capacity and load factor.

put

public V put(java.lang.String key,
             V value)

Maps the specified key to the specified value in this hashtable. Neither the key nor the value can be null .

The value can be retrieved by calling the get method with a key that is equal to the original key.

Specified by:

put in interface java.util.Map<java.lang.String,V>

Specified by:

put in class java.util.Dictionary<java.lang.String,V>

Parameters:

key - the hashtable key

value - the value

Returns:

the previous value of the specified key in this hashtable, or null if it did not have one

Throws:

java.lang.NullPointerException - if the key or value is null

See Also:

Object.equals(Object), get(Object)

remove

public V remove(java.lang.Object key)

Removes the key (and its corresponding value) from this hashtable. This method does nothing if the key is not in the hashtable.

Specified by:

remove in interface java.util.Map<java.lang.String,V>

Specified by:

remove in class java.util.Dictionary<java.lang.String,V>

Parameters:

key - the key that needs to be removed

Returns:

the value to which the key had been mapped in this hashtable, or null if the key did not have a mapping

Throws:

java.lang.NullPointerException - if the key is null

putAll

public void putAll(java.util.Map<? extends java.lang.String,? extends V> t)

Copies all of the mappings from the specified map to this hashtable. These mappings will replace any mappings that this hashtable had for any of the keys currently in the specified map.

Specified by:

putAll in interface java.util.Map<java.lang.String,V>

Parameters:

t - mappings to be stored in this map

Throws:

java.lang.NullPointerException - if the specified map is null

Since:

1.2

clear

public void clear()

Clears this hashtable so that it contains no keys.

Specified by:

clear in interface java.util.Map<java.lang.String,V>

clone

public java.lang.Object clone()

Creates a shallow copy of this hashtable. All the structure of the hashtable itself is copied, but the keys and values are not cloned. This is a relatively expensive operation.

Overrides:

clone in class java.lang.Object

Returns:

a clone of the hashtable

toString

public java.lang.String toString()

Returns a string representation of this Hashtable object in the form of a set of entries, enclosed in braces and separated by the ASCII characters ", " (comma and space). Each entry is rendered as the key, an equals sign =, and the associated element, where the toString method is used to convert the key and element to strings.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of this hashtable

keySet

public java.util.Set<java.lang.String> 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 (except through the iterator's own remove operation), 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.

Specified by:

keySet in interface java.util.Map<java.lang.String,V>

Since:

1.2

entrySet

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

Returns a Set view of the mappings 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 (except through the iterator's own remove operation, or through the setValue operation on a map entry returned by the iterator) 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.

Specified by:

entrySet in interface java.util.Map<java.lang.String,V>

Since:

1.2

values

public java.util.Collection<V> 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 (except through the iterator's own remove operation), 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.

Specified by:

values in interface java.util.Map<java.lang.String,V>

Since:

1.2

equals

public boolean equals(java.lang.Object o)

Compares the specified Object with this Map for equality, as per the definition in the Map interface.

Specified by:

equals in interface java.util.Map<java.lang.String,V>

Overrides:

equals in class java.lang.Object

Parameters:

o - object to be compared for equality with this hashtable

Returns:

true if the specified Object is equal to this Map

Since:

1.2

See Also:

Map.equals(Object)

hashCode

public int hashCode()

Returns the hash code value for this Map as per the definition in the Map interface.

Specified by:

hashCode in interface java.util.Map<java.lang.String,V>

Overrides:

hashCode in class java.lang.Object

Since:

1.2

See Also:

Map.hashCode()