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/*******************************************************************************
* Copyright (c) 2006 Oracle Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Cameron Bateman/Oracle - initial API and implementation
*
********************************************************************************/
package org.eclipse.jst.jsf.context;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import org.eclipse.core.runtime.IAdaptable;
/**
* An abstract implementation of the IDelegatingFactory interface
*
* Clients may extend this class.
*
* @author cbateman
*
*/
public abstract class AbstractDelegatingFactory implements IDelegatingFactory
{
/* instance attributes */
/**
* the list of registered factory delegates
*/
protected final CopyOnWriteArrayList<IAdaptable> _delegates;
private final List<Class> _supportedDelegates;
/**
* @param supportedDelegateTypes
* -- populates the list of classes used by the isValidDelegate
* contract
*/
protected AbstractDelegatingFactory(final Class[] supportedDelegateTypes)
{
_delegates = new CopyOnWriteArrayList<IAdaptable>();
final List<Class> supportedTypes = new ArrayList<Class>();
supportedTypes.addAll(Arrays.asList(supportedDelegateTypes));
_supportedDelegates = Collections.unmodifiableList(supportedTypes);
}
/**
* @see org.eclipse.jst.jsf.context.IDelegatingFactory#addFactoryDelegate(org.eclipse.core.runtime.IAdaptable)
*/
public final void addFactoryDelegate(final IAdaptable delegate)
{
if (isValidDelegate(delegate))
{
synchronized(_delegates)
{
_delegates.addIfAbsent(delegate);
if (_delegates.size() > 1)
{
List<IAdaptable> delegates = new ArrayList<IAdaptable>(_delegates);
Collections.sort(delegates, new Comparator()
{
public int compare(Object delegate1, Object delegate2)
{
final Class<?> clazz1 = delegate1.getClass();
final Class<?> clazz2 = delegate2.getClass();
Package package1 = clazz1.getPackage();
Package package2 = clazz2.getPackage();
boolean package1IsOSS = package1.getName().startsWith("org.eclipse.jst"); //$NON-NLS-1$
boolean package2IsOSS = package2.getName().startsWith("org.eclipse.jst"); //$NON-NLS-1$
if (package1IsOSS && !package2IsOSS)
{
// sort the oss one after the non-oss one
return 1;
}
else if (!package1IsOSS && package2IsOSS)
{
return -1;
}
// otherwise they are either both oss or both non-oss, so just
// sort canonically by name.
return clazz1.getName().compareTo(clazz2.getName());
}
});
_delegates.clear();
_delegates.addAll(delegates);
}
}
}
}
/**
* @see org.eclipse.jst.jsf.context.IDelegatingFactory#removeFactoryDelegate(org.eclipse.core.runtime.IAdaptable)
*/
public final boolean removeFactoryDelegate(final IAdaptable delegate)
{
return _delegates.remove(delegate);
}
/**
* @see org.eclipse.jst.jsf.context.IDelegatingFactory#getValidDelegateTypes()
*/
public final List<Class> getValidDelegateTypes()
{
return _supportedDelegates;
}
/**
* @see org.eclipse.jst.jsf.context.IDelegatingFactory#isValidDelegate(org.eclipse.core.runtime.IAdaptable)
*/
public final boolean isValidDelegate(final IAdaptable delegate)
{
for (final Class clazz : _supportedDelegates)
{
// if the delegate supports one of the valid delegate classes
// via adaptation, then it is a valid delegate
if (delegate.getAdapter(clazz) != null)
{
return true;
}
}
// if no found, delegate is not supported
return false;
}
}
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