| /******************************************************************************* |
| * Copyright (c) 2001, 2004 IBM Corporation and others. |
| * 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: |
| * IBM Corporation - initial API and implementation |
| * Jens Lukowski/Innoopract - initial renaming/restructuring |
| * |
| *******************************************************************************/ |
| package org.eclipse.wst.sse.core.internal.model; |
| |
| |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.wst.sse.core.internal.Logger; |
| import org.eclipse.wst.sse.core.internal.provisional.INodeAdapterFactory; |
| |
| |
| /** |
| * This class simply maintains the list of factories and returns singleton |
| * instances of them. Some "built in" types are automatically created form |
| * FactoryConfig, if not found registerd, but normally clients can/should |
| * register their own factories. |
| * |
| * Not intended for clients to subclass or instantiate. |
| * |
| */ |
| public final class FactoryRegistry { |
| |
| private List factories; |
| |
| /** |
| * intentionally default access |
| */ |
| FactoryRegistry() { |
| super(); |
| |
| } |
| |
| private List _getFactories() { |
| |
| if (factories == null) { |
| // may need to use java.util.Collections.synchronizedList() if |
| // syncronization becomes |
| // necessary (and if so, remember to synchronize on factories) |
| factories = new ArrayList(); |
| } |
| return factories; |
| |
| } |
| |
| public void addFactory(INodeAdapterFactory factory) { |
| _getFactories().add(factory); |
| } |
| |
| public void clearFactories() { |
| factories.clear(); |
| } |
| |
| /* |
| * @see FactoryRegistry#contains(Object) |
| */ |
| public boolean contains(Object type) { |
| boolean result = false; |
| // note: we're not using cloned list, so strictly speaking |
| // is not thread safe. |
| List internalList = _getFactories(); |
| for (int i = 0; i < internalList.size(); i++) { |
| INodeAdapterFactory factory = (INodeAdapterFactory) internalList.get(i); |
| if (factory.isFactoryForType(type)) { |
| result = true; |
| break; |
| } |
| } |
| return result; |
| } |
| |
| /** |
| * Returns a shallow copy of the list of factories in the registry. Note: |
| * this can not be used to add/remove factories. Its primarily provided |
| * for those few cases where a list of factories must be copied from one |
| * model and added to another. |
| */ |
| public List getFactories() { |
| // note: for object integrity, we don't let anyone get |
| // our main list (so they have to add through addFactory), |
| // but we will return a shallow "cloned" list. |
| List factoryList = new ArrayList(_getFactories()); |
| return factoryList; |
| } |
| |
| /** |
| * This method is a not a pure resistry. Factories retrieved based on |
| * their response to "isFactoryForType(type)". Note that if there is more |
| * than one factory that can answer 'true' that the most recently added |
| * factory is used. |
| */ |
| public INodeAdapterFactory getFactoryFor(Object type) { |
| |
| INodeAdapterFactory result = null; |
| if (factories == null) |
| return null; |
| int listSize = factories.size(); |
| for (int i = listSize - 1; i >= 0; i--) { |
| // It is the adapter factories responsibility to answer |
| // isFactoryForType so it gets choosen. |
| // Notice we are going through the list backwards to get the |
| // factory added last. |
| INodeAdapterFactory a = (INodeAdapterFactory) factories.get(i); |
| if (a.isFactoryForType(type)) { |
| result = a; |
| break; |
| } |
| } |
| return result; |
| |
| } |
| |
| /** |
| * |
| */ |
| public void release() { |
| // modified to work on copy of list, for V5PTF1 |
| // send release to local copy of list |
| // of factories, since some factories, during |
| // their release function, may remove |
| // themselves from the registry. |
| List localList = getFactories(); |
| for (int i = 0; i < localList.size(); i++) { |
| INodeAdapterFactory a = (INodeAdapterFactory) localList.get(i); |
| // To help bullet proof code, we'll catch and log |
| // any messages thrown by factories during release, |
| // but we'll attempt to keep going. |
| // In nearly all cases, though, such errors are |
| // severe for product/client, and need to be fixed. |
| try { |
| a.release(); |
| } |
| catch (Exception e) { |
| Logger.logException("Program problem releasing factory" + a, e); //$NON-NLS-1$ |
| } |
| } |
| } |
| |
| /** |
| * Removes a factory if it can be retrieved by getFactoryFor(type). If |
| * there is more than one, all are removed. If there is none, the call |
| * simply returns (that is, it is not considered an error). |
| */ |
| public void removeFactoriesFor(java.lang.Object type) { |
| if (factories != null) { |
| int listSize = factories.size(); |
| // we'll go backwards through list, since we're removing, so |
| // 'size' change won't matter. |
| // Note: I'm assuming other items in the collection do not change |
| // position |
| // simply because another was removed. |
| for (int i = listSize - 1; i >= 0; i--) { |
| // It is the adapter factories responsibility to answer |
| // isFactoryForType so it gets choosen. |
| INodeAdapterFactory a = (INodeAdapterFactory) factories.get(i); |
| if (a.isFactoryForType(type)) { |
| factories.remove(a); |
| } |
| } |
| } |
| } |
| |
| public void removeFactory(INodeAdapterFactory factory) { |
| _getFactories().remove(factory); |
| |
| } |
| |
| } |