| /******************************************************************************* |
| * Copyright (c) 2010 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 |
| *******************************************************************************/ |
| package org.eclipse.e4.core.services.internal.context; |
| |
| import java.lang.ref.WeakReference; |
| import org.eclipse.e4.core.services.context.ContextChangeEvent; |
| import org.eclipse.e4.core.services.injector.IObjectProvider; |
| import org.eclipse.e4.core.services.injector.ObjectDescriptor; |
| import org.eclipse.e4.core.services.internal.annotations.AnnotationsSupport; |
| |
| abstract public class InjectionAbstract implements IRunAndTrackObject { |
| |
| final static protected Object NOT_A_VALUE = new Object(); |
| |
| final protected WeakReference userObjectRef; |
| final protected AnnotationsSupport annotationSupport; |
| final protected IObjectProvider primarySupplier; |
| |
| protected boolean optional = false; |
| final private boolean batchProcess; |
| |
| abstract public boolean notify(ContextChangeEvent event); |
| |
| public InjectionAbstract(Object userObject, IObjectProvider primarySupplier, |
| boolean batchProcess) { |
| userObjectRef = new WeakReference(userObject); |
| // plug-in class that gets replaced in Java 1.5+ |
| annotationSupport = new AnnotationsSupport(); // TBD this should be a static util class |
| this.primarySupplier = primarySupplier; |
| this.batchProcess = batchProcess; |
| } |
| |
| public Object getObject() { |
| if (userObjectRef == null) |
| return null; |
| return userObjectRef.get(); |
| } |
| |
| protected boolean injectNulls(int eventType, IObjectProvider changed) { |
| if ((eventType != ContextChangeEvent.UNINJECTED) |
| && (eventType != ContextChangeEvent.DISPOSE)) |
| return false; |
| return (changed.equals(primarySupplier)); |
| } |
| |
| protected boolean ignoreMissing(int eventType, IObjectProvider changed) { |
| if (eventType == ContextChangeEvent.REMOVED) |
| return true; |
| if ((eventType != ContextChangeEvent.UNINJECTED) |
| && (eventType != ContextChangeEvent.DISPOSE)) |
| return false; |
| return (changed.equals(primarySupplier)); |
| } |
| |
| protected Object getValue(ObjectDescriptor objectDescriptor, InjectionProperties properties, |
| Class parameterType, boolean ignoreMissing, boolean injectWithNulls) { |
| // 1) if we have a provider, use it |
| Object provider = properties.getProvider(); |
| if (provider != null) |
| return provider; |
| |
| // 2) if we have the key in the context |
| if (primarySupplier.containsKey(objectDescriptor)) { |
| if (injectWithNulls) |
| return null; |
| Object value = primarySupplier.get(objectDescriptor); |
| if (value == null) |
| return value; |
| if (parameterType.isAssignableFrom(value.getClass())) |
| return value; |
| } |
| |
| // 3) can we ignore this argument? |
| if (ignoreMissing || properties.isOptional()) |
| return null; |
| |
| if (!optional) { |
| String msg = "Unable to find value for \"" + objectDescriptor.toString() + "\""; |
| throw new IllegalArgumentException(msg); |
| } |
| return NOT_A_VALUE; |
| } |
| |
| protected void logError(Object destination, Exception e) { |
| String msg = "Injection failed " + destination.toString(); |
| logError(msg, e); |
| } |
| |
| protected void logError(String msg, Exception e) { |
| System.out.println(msg); //$NON-NLS-1$ |
| if (e != null) |
| e.printStackTrace(); |
| // TBD convert this into real logging |
| // String msg = NLS.bind("Injection failed", destination.toString()); |
| // RuntimeLog.log(new Status(IStatus.WARNING, |
| // IRuntimeConstants.PI_COMMON, 0, msg, e)); |
| } |
| |
| public boolean batchProcess() { |
| return batchProcess; |
| } |
| |
| } |