org.apache.tools.ant.types.selectors.modifiedselector
Interface Cache

All Known Implementing Classes:

PropertiesfileCache

public interface Cache

A Cache let the user store key-value-pairs in a permanent manner and access them. It is possible that a client uses get() before load() therefore the implementation must ensure that no error occurred because of the wrong order. The implementing class should implement a useful toString() method.

Since:

Ant 1.6

Version:

2003-09-13

Method Summary

void	delete() Deletes the cache.
java.lang.Object	get(java.lang.Object key) Returns a value for a given key from the cache.
boolean	isValid() Checks its prerequisites.
java.util.Iterator<java.lang.String>	iterator() Returns an iterator over the keys in the cache.
void	load() Loads the cache, must handle not existing cache.
void	put(java.lang.Object key, java.lang.Object value) Saves a key-value-pair in the cache.
void	save() Saves modification of the cache.

Method Detail

isValid

boolean isValid()

Checks its prerequisites.

Returns:

true if all is ok, otherwise false.

delete

void delete()

Deletes the cache. If file based the file has to be deleted also.

load

void load()

Loads the cache, must handle not existing cache.

save

void save()

Saves modification of the cache.

get

java.lang.Object get(java.lang.Object key)

Returns a value for a given key from the cache.

Parameters:

key - the key

Returns:

the stored value

put

void put(java.lang.Object key,
         java.lang.Object value)

Saves a key-value-pair in the cache.

Parameters:

key - the key

value - the value

iterator

java.util.Iterator<java.lang.String> iterator()

Returns an iterator over the keys in the cache.

Returns:

An iterator over the keys.