org.freehep.util

Class DoubleHashtable

java.lang.Object

java.util.AbstractCollection

org.freehep.util.DoubleHashtable

All Implemented Interfaces:

java.io.Serializable, java.lang.Iterable, java.util.Collection

public class DoubleHashtable
extends java.util.AbstractCollection
implements java.io.Serializable

Stores a hashtable of hashtables, which can be indexed by a key and a subkey. Keys and Values can be null.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
DoubleHashtable() creates a hashtable of hashtables

Method Summary

Modifier and Type	Method and Description
void	clear() removes all entries and sub-tables
void	clear(java.lang.Object key) removes all entries from a subtable
java.lang.Object	clone()
boolean	contains(java.lang.Object value)
boolean	containsKey(java.lang.Object key)
boolean	containsKey(java.lang.Object key, java.lang.Object subKey)
java.util.Enumeration	elements()
java.util.Hashtable	get(java.lang.Object key)
java.lang.Object	get(java.lang.Object key, java.lang.Object subKey)
boolean	isEmpty()
java.util.Iterator	iterator()
java.util.Enumeration	keys()
java.util.Enumeration	keys(java.lang.Object key)
java.lang.Object	put(java.lang.Object key, java.lang.Object subKey, java.lang.Object value) puts a value in sub-table specified by key and subkey.
java.lang.Object	remove(java.lang.Object key, java.lang.Object subKey) removes value from sub-table specified by key and subkey.
int	size()
java.lang.String	toString()

Methods inherited from class java.util.AbstractCollection

add, addAll, containsAll, remove, removeAll, retainAll, toArray, toArray

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

equals, hashCode, parallelStream, removeIf, spliterator, stream

Methods inherited from interface java.lang.Iterable

forEach

Constructor Detail

DoubleHashtable

public DoubleHashtable()

creates a hashtable of hashtables

Method Detail

clear

public void clear()

removes all entries and sub-tables

Specified by:

clear in interface java.util.Collection

Overrides:

clear in class java.util.AbstractCollection

clear

public void clear(java.lang.Object key)

removes all entries from a subtable

clone

public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException

Overrides:

clone in class java.lang.Object

Throws:

java.lang.CloneNotSupportedException

contains

public boolean contains(java.lang.Object value)

Specified by:

contains in interface java.util.Collection

Overrides:

contains in class java.util.AbstractCollection

Returns:

true if value exists in some sub-table

containsKey

public boolean containsKey(java.lang.Object key)

Returns:

true if sub-table exists for key

containsKey

public boolean containsKey(java.lang.Object key,
                           java.lang.Object subKey)

Returns:

true if value exists for key and subkey

elements

public java.util.Enumeration elements()

Returns:

enumeration over all values in all sub-tables

iterator

public java.util.Iterator iterator()

Specified by:

iterator in interface java.lang.Iterable

Specified by:

iterator in interface java.util.Collection

Specified by:

iterator in class java.util.AbstractCollection

Returns:

iterator over all values in all sub-tables

get

public java.util.Hashtable get(java.lang.Object key)

Returns:

sub-table for key

get

public java.lang.Object get(java.lang.Object key,
                            java.lang.Object subKey)

Returns:

value for key and subkey, null in non-existent or null value was stored

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Collection

Overrides:

isEmpty in class java.util.AbstractCollection

Returns:

true if table is empty

keys

public java.util.Enumeration keys()

Returns:

enumeration of keys in table

keys

public java.util.Enumeration keys(java.lang.Object key)

Returns:

enumeration in subkeys of sub-table pointed by key, and empty if sub-table does not exist

put

public java.lang.Object put(java.lang.Object key,
                            java.lang.Object subKey,
                            java.lang.Object value)

puts a value in sub-table specified by key and subkey.

Returns:

previous value

remove

public java.lang.Object remove(java.lang.Object key,
                               java.lang.Object subKey)

removes value from sub-table specified by key and subkey.

Returns:

previous value

size

public int size()

Specified by:

size in interface java.util.Collection

Specified by:

size in class java.util.AbstractCollection

Returns:

size of all tables

toString

public java.lang.String toString()

Overrides:

toString in class java.util.AbstractCollection

Returns:

a string representation of the table