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Home -> Cog -> Distribution -> 1.1 -> Api -> Org -> Globus -> Common

org.globus.common
Class MVHashtable

java.lang.Object
  |
  +--org.globus.common.MVHashtable

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

ConstrainedMVHashtable, MDSResult

public class MVHashtable

extends Object

implements Serializable

MVHashtable is an implementation of a multi-valued hashtable. Each entry of the hashtable is identified by a String key. Besides the key being a String rather than an object, MVHashtable differs from Hashtable in that it maps a single key to multiple values. Each attribute uses a vector for storing multiple values under the same key. Methods are available which help access and manipulate the entries. Where possible, methods are named analogous to similar methods in Hashtable.

See Also:

Serialized Form

Field Summary

protected Hashtable

attribs holds the attributes of the MVHashtable

Constructor Summary

MVHashtable()
Default Constructor creates empty MVHashtable.

MVHashtable(int initialSize)
Initial-size Constructor creates empty MVHashtable with specified initial size.

MVHashtable(MVHashtable multivaluedHashtable)
Copy Constructor

Method Summary

void	add(MVHashtable multivaluedHashtable) Adds attributes that are stored in a seperate MVHashtable object.
void	add(String key, Object value) Adds a single value to the specified key.
void	add(String key, Object[] values) Adds multiple values to the attribute associated with the given key.
void	add(String key, Vector values) Adds multiple values to the attribute associated with the given key.
void	clear() Deletes all attributes.
boolean	contains(String key, Object value) Returns true if the given value is stored under a specific attribute.
boolean	containsName(String key) Returns true if the attribute associated with the given key exists.
Vector	get(String key) Returns a vector of values for a specific attribute.
Object	getFirstValue(String key) Returns the first value for a specific attribute.
Vector	getKeys() Returns a vector of the keys.
Object	getLastValue(String key) Returns the last value for a specific attribute.
Object	getValueAt(String key, int index) Returns a value at the given position index for a specific attribute.
Enumeration	keys() Returns an enumeration of all attribute keys.
void	print() Prints out the contents of the data structure.
Object	remove(String key) Remove an attribute and all values associated with it.
Object	remove(String key, int index) Removes a value at the specified index within the attribute.
boolean	remove(String key, Object value) Removes a particular value within an attribute.
Vector	set(String key, Object value) Sets a new value for the specified attribute.
int	size() Returns the number of attributes.
int	size(String key) Returns the number of entries for an attribute.
String	toString() Converts the internal data structure to a string.

Methods inherited from class java.lang.Object

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

Field Detail

attribs

protected Hashtable attribs

holds the attributes of the MVHashtable

Constructor Detail

MVHashtable

public MVHashtable()

Default Constructor creates empty MVHashtable.

MVHashtable

public MVHashtable(int initialSize)

Initial-size Constructor creates empty MVHashtable with specified initial size.

Parameters:

initialSize - the initial capacity of the hashtable.

MVHashtable

public MVHashtable(MVHashtable multivaluedHashtable)

Copy Constructor

Parameters:

multivaluedHashtable - the MVHashtable that will start as the base of this new MVHashtable

Method Detail

set

public Vector set(String key,
                  Object value)

Sets a new value for the specified attribute.

Parameters:

key - the attribute key.

value - the entry value.

Returns:

Vector of previous values associated with the attribute. Null, if the attribute was not associated with any values.

add

public void add(String key,
                Object value)

Adds a single value to the specified key. If there is already an attribute with this key, the value is appended to the end of values list.

Parameters:

key - the attribute key.

value - the value to add.

add

public void add(String key,
                Object[] values)

Adds multiple values to the attribute associated with the given key. The values are appended to the end of the values list (if any).

Parameters:

key - the attribute key.

values - the array of values.

add

public void add(String key,
                Vector values)

Adds multiple values to the attribute associated with the given key. The values are appended to the end of the values list (if any).

Parameters:

key - the attribute key.

value - the Vector of values to add.

add

public void add(MVHashtable multivaluedHashtable)

Adds attributes that are stored in a seperate MVHashtable object.

Parameters:

multivaluedHashtable - The to-be-absorbed MVHashtable

remove

public Object remove(String key)

Remove an attribute and all values associated with it.

Parameters:

key - the attribute key.

Returns:

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

remove

public boolean remove(String key,
                      Object value)

Removes a particular value within an attribute.

Parameters:

key - the attribute key.

value - the value to delete.

Returns:

true if the value was removed, false otherwise.

remove

public Object remove(String key,
                     int index)

Removes a value at the specified index within the attribute. Note that the indicies of all objects greater than "index" are decremented by one.

Parameters:

key - the attribute key.

index - the index of the value to delete.

Returns:

the element that was removed from the list of valus

clear

public void clear()

Deletes all attributes.

size

public int size()

Returns the number of attributes.

Returns:

int the number of attributes

size

public int size(String key)

Returns the number of entries for an attribute.

Parameters:

key - The attribute key.

Returns:

int the number of entries of the attribute

containsName

public boolean containsName(String key)

Returns true if the attribute associated with the given key exists.

Parameters:

key - The attribute key.

Returns:

boolean true if attribute exists, false if not

contains

public boolean contains(String key,
                        Object value)

Returns true if the given value is stored under a specific attribute.

Parameters:

key - the attribute key.

value - the entry value.

Returns:

boolean true if value is stored under specified attribute

keys

public Enumeration keys()

Returns an enumeration of all attribute keys.

Returns:

Enumeration of all attribute keys

getKeys

public Vector getKeys()

Returns a vector of the keys. Keys are strings.

Returns:

Vector of keys

get

public Vector get(String key)

Returns a vector of values for a specific attribute.

Parameters:

key - the attribute key.

Returns:

Vector of values for the specified attribute

getFirstValue

public Object getFirstValue(String key)

Returns the first value for a specific attribute.

Parameters:

key - the attribute key.

Returns:

Object the first value for the specified attribute

getLastValue

public Object getLastValue(String key)

Returns the last value for a specific attribute.

Parameters:

key - the attribute key.

Returns:

Object the last value for the specified attribute

getValueAt

public Object getValueAt(String key,
                         int index)

Returns a value at the given position index for a specific attribute.

Parameters:

key - the attribute key.

index - the index of the value to return for the attribute.

Returns:

Object the value at the specified index position of the specified attribute. Null if not found.

print

public void print()

Prints out the contents of the data structure. This method is used for debugging purposes.

toString

public String toString()

Converts the internal data structure to a string.

Overrides:

toString in class Object

Returns:

String a string representation of this structure.