edu.umass.cs.utils

Class NullIfEmptyMap<KeyType,ValueType>

java.lang.Object

edu.umass.cs.utils.NullIfEmptyMap<KeyType,ValueType>

Type Parameters:

KeyType -

ValueType -

public class NullIfEmptyMap<KeyType,ValueType>
extends java.lang.Object

Author:

V. Arun

Constructor Summary

Constructors

Constructor and Description
NullIfEmptyMap()

Method Summary

Modifier and Type	Method and Description
void	clear()
boolean	containsKey(KeyType key)
boolean	containsValue(ValueType value)
java.util.Set<java.util.Map.Entry<KeyType,ValueType>>	entrySet()
KeyType	firstKey()
ValueType	get(KeyType key)
java.util.TreeMap<KeyType,ValueType>	getMap() Make a copy and return.
boolean	isEmpty()
java.util.Set<KeyType>	keySet()
KeyType	lastKey()
static void	main(java.lang.String[] args)
void	put(KeyType key, ValueType value)
ValueType	remove(KeyType key)
int	size()
java.util.Collection<ValueType>	values()

Methods inherited from class java.lang.Object

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

Constructor Detail

NullIfEmptyMap

public NullIfEmptyMap()

Method Detail

put

public void put(KeyType key,
                ValueType value)

Parameters:

key -

value -

get

public ValueType get(KeyType key)

Parameters:

key -

Returns:

The value for the key.

remove

public ValueType remove(KeyType key)

Parameters:

key -

Returns:

The value removed.

containsKey

public boolean containsKey(KeyType key)

Parameters:

key -

Returns:

True if key present.

containsValue

public boolean containsValue(ValueType value)

Parameters:

value -

Returns:

True if value present.

keySet

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

Returns:

The key set.

values

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

Returns:

The values.

getMap

public java.util.TreeMap<KeyType,ValueType> getMap()

Make a copy and return. Caller can modify returned map without affecting this map.

Returns:

The copied map.

entrySet

public java.util.Set<java.util.Map.Entry<KeyType,ValueType>> entrySet()

Returns:

The entry set.

size

public int size()

Returns:

The size.

isEmpty

public boolean isEmpty()

Returns:

True if empty.

clear

public void clear()

firstKey

public KeyType firstKey()

Returns:

Minimum key.

lastKey

public KeyType lastKey()

Returns:

Minimum key.

main

public static void main(java.lang.String[] args)

Parameters:

args -