y.io.graphml
Class DictionaryLookup

java.lang.Object
  y.io.graphml.DictionaryLookup

All Implemented Interfaces:

Lookup

public final class DictionaryLookup
extends Object
implements Lookup

A simple mutable Lookup implementation that is backed by a Map.

Constructor Summary

DictionaryLookup()
Creates an instance with an initially empty map as backing store.

DictionaryLookup(Map map)
Creates an instance with the given map as the backing store.

Method Summary

boolean	hasLookup(Class type) Determines whether the specified type exists in this lookup.
Object	lookup(Class type) Performs the lookup
void	put(Class type, Object value) Adds an in instance to the map for the given type.
void	remove(Class type) Removes the specified type from this lookup.

Methods inherited from class java.lang.Object

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

Constructor Detail

DictionaryLookup

public DictionaryLookup()

Creates an instance with an initially empty map as backing store.

DictionaryLookup

public DictionaryLookup(Map map)

Creates an instance with the given map as the backing store.

Throws:

IllegalArgumentException - if the map is null

Parameters:

map - the backing store.

Method Detail

put

public void put(Class type,
                Object value)

Adds an in instance to the map for the given type.

If value is null the entry is removed from the map.

Throws:

IllegalArgumentException - if the parameters do not match

Parameters:

type - the type that will be used as a key for queries

value - the instance implementing type or null

lookup

public Object lookup(Class type)

Performs the lookup

Specified by:

lookup in interface Lookup

Parameters:

type - the type to query

Returns:

the instance found in the map or null

hasLookup

public boolean hasLookup(Class type)

Determines whether the specified type exists in this lookup.

Parameters:

type - The type to look up.

Returns:

true if the specified type exists in this lookup; false otherwise.

remove

public void remove(Class type)

Removes the specified type from this lookup.

Parameters:

type - The type to remove from this instance.