| /******************************************************************************* |
| * 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.Iterator; |
| import java.util.List; |
| |
| 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 List<IAdaptable> _delegates; |
| |
| private final List<Class> _supportedDelegates; |
| |
| /** |
| * @param supportedDelegateTypes -- populates the list of classes used |
| * by the isValidDelegate contract |
| */ |
| protected AbstractDelegatingFactory(Class[] supportedDelegateTypes) |
| { |
| _delegates = new ArrayList<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(IAdaptable delegate) |
| { |
| synchronized(_delegates) |
| { |
| |
| if (!_delegates.contains(delegate) |
| && isValidDelegate(delegate)) |
| { |
| _delegates.add(delegate); |
| } |
| } |
| } |
| |
| /** |
| * @see org.eclipse.jst.jsf.context.IDelegatingFactory#removeFactoryDelegate(org.eclipse.core.runtime.IAdaptable) |
| */ |
| public final boolean removeFactoryDelegate(IAdaptable delegate) |
| { |
| synchronized(_delegates) |
| { |
| 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(IAdaptable delegate) |
| { |
| for (final Iterator<Class> it = _supportedDelegates.iterator(); it.hasNext();) |
| { |
| final Class clazz = it.next(); |
| |
| // 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; |
| } |
| } |