org.apache.tools.ant.util

Class LazyHashtable

java.lang.Object

java.util.Dictionary<K,V>

java.util.Hashtable

org.apache.tools.ant.util.LazyHashtable

All Implemented Interfaces:

Serializable, Cloneable, Map

public class LazyHashtable
extends Hashtable

Hashtable implementation that allows delayed construction of expensive objects All operations that need access to the full list of objects will call initAll() first. Get and put are cheap.

Since:

Ant 1.6

See Also:

Serialized Form

Nested Class Summary

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

Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	initAllDone

Constructor Summary

Constructors

Constructor and Description
LazyHashtable() No arg constructor.

Method Summary

Modifier and Type	Method and Description
boolean	contains(Object value) Check if the table contains a particular value.
boolean	containsKey(Object value) Check if the table contains a particular key.
boolean	containsValue(Object value) Delegates to contains.
Enumeration	elements() Get a enumeration over the elements.
protected void	initAll() Used to be part of init.
boolean	isEmpty() Check if the table is empty.
Enumeration	keys() Get an enumeration over the keys.
int	size() Get the size of the table.

Methods inherited from class java.util.Hashtable

clear, clone, entrySet, equals, get, hashCode, keySet, put, putAll, rehash, remove, toString, values

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

initAllDone

protected boolean initAllDone

Constructor Detail

LazyHashtable

public LazyHashtable()

No arg constructor.

Method Detail

contains

public boolean contains(Object value)

Check if the table contains a particular value.

Overrides:

contains in class Hashtable

Parameters:

value - the value to look for.

Returns:

true if the table contains the value.

containsKey

public boolean containsKey(Object value)

Check if the table contains a particular key.

Specified by:

containsKey in interface Map

Overrides:

containsKey in class Hashtable

Parameters:

value - the key to look for.

Returns:

true if the table contains key.

See Also:

Hashtable.contains(Object)

containsValue

public boolean containsValue(Object value)

Delegates to contains.

Specified by:

containsValue in interface Map

Overrides:

containsValue in class Hashtable

Parameters:

value - the value to look for.

Returns:

true if the table contains the value.

elements

public Enumeration elements()

Get a enumeration over the elements.

Overrides:

elements in class Hashtable

Returns:

an enumeration.

See Also:

Enumeration, Hashtable.keys(), Hashtable.values(), Map

initAll

protected void initAll()

Used to be part of init. It must be done once - but we delay it until we do need _all_ tasks. Otherwise we just get the tasks that we need, and avoid costly init.

isEmpty

public boolean isEmpty()

Check if the table is empty.

Specified by:

isEmpty in interface Map

Overrides:

isEmpty in class Hashtable

Returns:

true if it is.

keys

public Enumeration keys()

Get an enumeration over the keys.

Overrides:

keys in class Hashtable

Returns:

an enumeration.

See Also:

Enumeration, Hashtable.elements(), Hashtable.keySet(), Map

size

public int size()

Get the size of the table.

Specified by:

size in interface Map

Overrides:

size in class Hashtable

Returns:

the size.