ix.util
Class FanComposer

java.lang.Object
  ix.util.FanComposer

public class FanComposer
extends java.lang.Object

Composes Object-to-Collection mappings ("fans"). A "fan" is just a convenient term for a one-to-many mapping: think of each one-to-many as having a fan-like shape.

The result is not constructed until requested by a call to the getResultMap() method. The "apply" methods just remember the map or graph and invalidate any existing result.

The result is a map made by a call to makeResultMap(), and the values in that map are collections each made by the makeValueCollection() method. In this class, they construct a StableHashMap and a HashSet respectively. Subclasses should override those methods if different classes are desired.

Field Summary

protected LListCollector	allFans
protected java.util.Collection	keys
protected java.util.Map	result

Constructor Summary

FanComposer(java.util.Collection keys)
Construct a FanComposer that will build a map that has the specified keys.

Method Summary

void	apply(DirectedGraph g)
void	apply(Function1 f)
void	apply(java.util.Map m)
java.util.Map	getResultMap() Return the result as a Map.
protected java.util.Map	makeResultMap()
protected java.util.Collection	makeValueCollection()

Methods inherited from class java.lang.Object

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

Field Detail

keys

protected java.util.Collection keys

allFans

protected LListCollector allFans

result

protected java.util.Map result

Constructor Detail

FanComposer

public FanComposer(java.util.Collection keys)

Construct a FanComposer that will build a map that has the specified keys.

Method Detail

apply

public void apply(java.util.Map m)

apply

public void apply(DirectedGraph g)

apply

public void apply(Function1 f)

getResultMap

public java.util.Map getResultMap()

Return the result as a Map.

makeResultMap

protected java.util.Map makeResultMap()

makeValueCollection

protected java.util.Collection makeValueCollection()