netbeans.apache.org/src/content/wiki/DevFaqLookupForDataNode.asciidoc

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= DevFaqLookupForDataNode
:jbake-type: wiki
:jbake-tags: wiki, devfaq, needsreview
:jbake-status: published
:keywords: Apache NetBeans wiki DevFaqLookupForDataNode
:description: Apache NetBeans wiki DevFaqLookupForDataNode
:toc: left
:toc-title:
:syntax: true

=== How can I add support for `Lookup`s on nodes representing my file type?

Any object you create can implement `Lookup.Provider`. The simplest way to create a mutable lookup is by using `InstanceContent` and `AbstractLookup`.  Simplified typical usage:

[source,java]
----

public SomeObject implements Lookup.Provider {
   private InstanceContent content = new InstanceContent();
   private final AbstractLookup lkp = new AbstractLookup(content);
   
   public someMethod() {
      ic.set (someCollection...);
   }

   public Lookup getLookup() {
      return lkp;
   }
}

----

This is how you create a lookup with dynamic content of your choosing.  See also Tom Wheeler's  link:http://www.tomwheeler.com/netbeans/[TodoListManager] for an example of some code that illustrates how to do this.

If you are using `link:http://bits.netbeans.org/dev/javadoc/org-openide-util-lookup/org/openide/util/lookup/ProxyLookup.html[ProxyLookup]` to proxy another (or multiple) lookups, and you want to change the set of Lookups you are proxying on the fly, you will need to subclass `ProxyLookup` and call the protected method [link:http://bits.netbeans.org/dev/javadoc/org-openide-util-lookup/org/openide/util/lookup/ProxyLookup.html#setLookups(org.openide.util.Lookup[http://bits.netbeans.org/dev/javadoc/org-openide-util-lookup/org/openide/util/lookup/ProxyLookup.html#setLookups(org.openide.util.Lookup]...) `setLookups(Lookup... lookups)`].

=== Apache Migration Information

The content in this page was kindly donated by Oracle Corp. to the
Apache Software Foundation.

This page was exported from link:http://wiki.netbeans.org/DevFaqLookupForDataNode[http://wiki.netbeans.org/DevFaqLookupForDataNode] , 
that was last modified by NetBeans user Jtulach 
on 2010-07-24T20:17:21Z.


*NOTE:* This document was automatically converted to the AsciiDoc format on 2018-02-07, and needs to be reviewed.