## 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 occured because of the wrong order. The implementing class should implement a useful toString() method.

Since:
  Ant 1.6
Version:
  2003-09-13
Author:
  Jan Matèrne

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` `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

    public boolean isValid()

  Checks its prerequisites.

  Returns:
    true if all is ok, otherwise false.

### delete

    public void delete()

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

### load

    public void load()

  Loads the cache, must handle not existing cache.

### save

    public void save()

  Saves modification of the cache.

### get

    public 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

    public 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

    public java.util.Iterator iterator()

  Returns an iterator over the keys in the cache.

  Returns:
    An iterator over the keys.

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