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package org.apache.commons.collections;
import java.util.SortedMap;
/**
* Defines a map that allows bidirectional lookup between key and values
* and retains both keys and values in sorted order.
*
* Implementations should allow a value to be looked up from a key and
* a key to be looked up from a value with equal performance.
*
* @since Commons Collections 3.0
* @version $Revision: 1.5 $ $Date: 2004/01/14 21:43:05 $
*
* @author Stephen Colebourne
*/
public interface SortedBidiMap extends OrderedBidiMap, SortedMap {
/**
* Gets a view of this map where the keys and values are reversed.
*
* Changes to one map will be visible in the other and vice versa.
* This enables both directions of the map to be accessed equally.
*
* Implementations should seek to avoid creating a new object every time this
* method is called. See AbstractMap.values()
etc. Calling this
* method on the inverse map should return the original.
*
* Implementations must return a SortedBidiMap
instance,
* usually by forwarding to inverseSortedBidiMap()
.
*
* @return an inverted bidirectional map
*/
public BidiMap inverseBidiMap();
/**
* Gets a view of this map where the keys and values are reversed.
*
* Changes to one map will be visible in the other and vice versa.
* This enables both directions of the map to be accessed as a SortedMap
.
*
* Implementations should seek to avoid creating a new object every time this
* method is called. See AbstractMap.values()
etc. Calling this
* method on the inverse map should return the original.
*
* The inverse map returned by inverseBidiMap()
should be the
* same object as returned by this method.
*
* @return an inverted bidirectional map
*/
public SortedBidiMap inverseSortedBidiMap();
}