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package org.openide.util.lookup;

import java.lang.ref.WeakReference;

import java.util.*;

import junit.framework.*;

import org.netbeans.junit.*;

import org.openide.util.Lookup;

/** To simulate issue 42244.

 */

@SuppressWarnings("unchecked") // XXX ought to be corrected, just a lot of them

public class SimpleProxyLookupIssue42244Test extends AbstractLookupBaseHid implements AbstractLookupBaseHid.Impl {

    public SimpleProxyLookupIssue42244Test (java.lang.String testName) {

        super(testName, null);

    }

    public static Test suite() {

        // return new SimpleProxyLookupIssue42244Test("testGarbageCollect");

        return new NbTestSuite(SimpleProxyLookupIssue42244Test.class);

    }

    /** Creates an lookup for given lookup. This class just returns 

     * the object passed in, but subclasses can be different.

     * @param lookup in lookup

     * @return a lookup to use

     */

    public Lookup createLookup (final Lookup lookup) {

        class C implements Lookup.Provider {

            public Lookup getLookup () {

                return lookup;

            }

        }

        return Lookups.proxy (new C ());

    }

    public Lookup createInstancesLookup (InstanceContent ic) {

        return new KeepResultsProxyLookup (new AbstractLookup (ic));

    }

    public void clearCaches () {

        KeepResultsProxyLookup k = (KeepResultsProxyLookup)this.instanceLookup;

        ArrayList toGC = new ArrayList ();

        Iterator it = k.allQueries.iterator ();

        while (it.hasNext ()) {

            Lookup.Result r = (Lookup.Result)it.next ();

            toGC.add (new WeakReference (r));

        }

        k.allQueries = null;

        it = toGC.iterator ();

        while (it.hasNext ()) {

            WeakReference r = (WeakReference)it.next ();

            assertGC ("Trying to release all results from memory", r);

        }

    }

    class KeepResultsProxyLookup extends ProxyLookup {

        private ArrayList allQueries = new ArrayList ();

        private ThreadLocal in = new ThreadLocal ();

        public KeepResultsProxyLookup (Lookup delegate) {

            super (new Lookup[] { delegate });

        }

        @Override

        protected void beforeLookup (org.openide.util.Lookup.Template template) {

            super.beforeLookup (template);

            if (allQueries != null && in.get () == null) {

                in.set (this);

                Lookup.Result res = lookup (template);

                allQueries.add (res);

                in.set (null);

            }

        }

    }

}