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ProxyLookup (Utilities API) - NetBeans API Javadoc (Current Development Version)

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org.openide.util.lookup
Class ProxyLookup

java.lang.Object
  org.openide.util.Lookup
      org.openide.util.lookup.ProxyLookup

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public class ProxyLookup
extends Lookup

Implementation of lookup that can delegate to others.

Since:

1.9

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Nested Class Summary

 

Nested classes/interfaces inherited from class org.openide.util.Lookup
Lookup.Item<T>, Lookup.Provider, Lookup.Result<T>, Lookup.Template<T>

 

Field Summary

 

Fields inherited from class org.openide.util.Lookup
EMPTY

 

Constructor Summary
protected	ProxyLookup()           Create a lookup initially proxying to no others.
	ProxyLookup(Lookup... lookups)           Create a proxy to some other lookups.

 

Method Summary
protected  void	beforeLookup(Lookup.Template<?> template)           Notifies subclasses that a query is about to be processed.
protected  Lookup[]	getLookups()           Getter for the delegates.
<T> T	lookup(Class<T> clazz)           Look up an object matching a given interface.
<T> Lookup.Result<T>	lookup(Lookup.Template<T> template)           The general lookup method.
<T> Lookup.Item<T>	lookupItem(Lookup.Template<T> template)           Look up the first item matching a given template.
protected  void	setLookups(Lookup... lookups)           Changes the delegates.
String	toString()

 

Methods inherited from class org.openide.util.Lookup
getDefault, lookupAll, lookupResult

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Constructor Detail

ProxyLookup

public ProxyLookup(Lookup... lookups)

Create a proxy to some other lookups.

Parameters:

lookups - the initial delegates

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ProxyLookup

protected ProxyLookup()

Create a lookup initially proxying to no others. Permits serializable subclasses.

Since:

3.27

Method Detail

toString

public String toString()

Overrides:

toString in class Object

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getLookups

protected final Lookup[] getLookups()

Getter for the delegates.

Returns:

the array of lookups we delegate to

Since:

1.19

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setLookups

protected final void setLookups(Lookup... lookups)

Changes the delegates.

Parameters:

lookups - the new lookups to delegate to

Since:

1.19 protected

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beforeLookup

protected void beforeLookup(Lookup.Template<?> template)

Notifies subclasses that a query is about to be processed. Subclasses can update its state before the actual processing begins. It is allowed to call setLookups method to change/update the set of objects the proxy delegates to.

Parameters:

template - the template of the query

Since:

1.31

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lookup

public final <T> T lookup(Class<T> clazz)

Description copied from class: Lookup

Look up an object matching a given interface. This is the simplest method to use. If more than one object matches, the first will be returned. The template class may be a class or interface; the instance is guaranteed to be assignable to it.

Specified by:

lookup in class Lookup

Parameters:

clazz - class of the object we are searching for

Returns:

an object implementing the given class or null if no such implementation is found

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lookupItem

public final <T> Lookup.Item<T> lookupItem(Lookup.Template<T> template)

Description copied from class: Lookup

Look up the first item matching a given template. Includes not only the instance but other associated information.

Overrides:

lookupItem in class Lookup

Parameters:

template - the template to check

Returns:

a matching item or null

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lookup

public final <T> Lookup.Result<T> lookup(Lookup.Template<T> template)

Description copied from class: Lookup

The general lookup method. Callers can get list of all instances and classes that match the given template, request more info about them in form of Lookup.Item and attach a listener to this be notified about changes. The general interface does not specify whether subsequent calls with the same template produce new instance of the Lookup.Result or return shared instance. The prefered behaviour however is to return shared one.

Specified by:

lookup in class Lookup

Parameters:

template - a template describing the services to look for

Returns:

an object containing the results

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