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/*******************************************************************************
* Copyright (c) 2009, 2011 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.internal.contexts;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Stack;
import javax.inject.Named;
import org.eclipse.e4.core.contexts.Active;
import org.eclipse.e4.core.contexts.IEclipseContext;
import org.eclipse.e4.core.contexts.RunAndTrack;
import org.eclipse.e4.core.di.IInjector;
import org.eclipse.e4.core.di.suppliers.IObjectDescriptor;
import org.eclipse.e4.core.di.suppliers.IRequestor;
import org.eclipse.e4.core.di.suppliers.PrimaryObjectSupplier;
public class ContextObjectSupplier extends PrimaryObjectSupplier {
final static protected String ECLIPSE_CONTEXT_NAME = IEclipseContext.class.getName();
public static class ContextInjectionListener extends RunAndTrackExt {
final private Object[] result;
final private String[] keys;
final private boolean[] active;
final private IRequestor requestor;
final private IEclipseContext context;
public ContextInjectionListener(IEclipseContext context, Object[] result, String[] keys, boolean[] active, IRequestor requestor, boolean group) {
super(group);
this.result = result;
this.keys = keys;
this.active = active;
this.requestor = requestor;
this.context = context;
}
public boolean update(IEclipseContext eventsContext, int eventType, Object[] extraArguments) {
if (eventType == ContextChangeEvent.INITIAL) {
// needs to be done inside runnable to establish dependencies
for (int i = 0; i < keys.length; i++) {
if (keys[i] == null)
continue;
IEclipseContext targetContext = (active[i]) ? context.getActiveLeaf() : context;
if (ECLIPSE_CONTEXT_NAME.equals(keys[i])) {
result[i] = targetContext;
targetContext.getParent(); // creates pseudo-link
} else if (targetContext.containsKey(keys[i]))
result[i] = targetContext.get(keys[i]);
}
return true;
}
if (eventType == ContextChangeEvent.DISPOSE) {
if (eventsContext == context) {
ContextObjectSupplier originatingSupplier = eventsContext.getLocal(ContextObjectSupplier.class);
requestor.disposed(originatingSupplier);
return false;
}
} else if (eventType == ContextChangeEvent.UNINJECTED) {
if (eventsContext == context) {
ContextObjectSupplier originatingSupplier = eventsContext.getLocal(ContextObjectSupplier.class);
return requestor.uninject(extraArguments[0], originatingSupplier);
}
} else {
if (!requestor.isValid())
return false; // remove this listener
requestor.resolveArguments(false);
requestor.execute();
}
return true;
}
public boolean changed(IEclipseContext eventsContext) {
return true;
}
@Override
public int hashCode() {
final int prime = 31;
int hashRresult = 1;
hashRresult = prime * hashRresult + ((context == null) ? 0 : context.hashCode());
hashRresult = prime * hashRresult + ((requestor == null) ? 0 : requestor.hashCode());
return hashRresult;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
ContextInjectionListener other = (ContextInjectionListener) obj;
if (context == null) {
if (other.context != null)
return false;
} else if (!context.equals(other.context))
return false;
if (requestor == null) {
if (other.requestor != null)
return false;
} else if (!requestor.equals(other.requestor))
return false;
return true;
}
@Override
public String toString() {
return requestor.toString();
}
}
final private IEclipseContext context;
public ContextObjectSupplier(IEclipseContext context, IInjector injector) {
this.context = context;
}
public IEclipseContext getContext() {
return context;
}
@Override
public void get(IObjectDescriptor[] descriptors, Object[] actualArgs, final IRequestor requestor, boolean initial, boolean track, boolean group) {
final String[] keys = new String[descriptors.length];
final boolean[] active = new boolean[descriptors.length];
for (int i = 0; i < descriptors.length; i++) {
String key = getKey(descriptors[i]);
if ((actualArgs[i] == IInjector.NOT_A_VALUE))
keys[i] = key;
else if (ECLIPSE_CONTEXT_NAME.equals(key)) // allow provider to override IEclipseContext
keys[i] = ECLIPSE_CONTEXT_NAME;
else
keys[i] = null;
if (descriptors[i] == null)
active[i] = false;
else
active[i] = (descriptors[i].hasQualifier(Active.class));
}
if (requestor != null && track) { // only track if requested
if (initial) {
RunAndTrack trackable = new ContextInjectionListener(context, actualArgs, keys, active, requestor, group);
context.runAndTrack(trackable);
} else { // we do track if this is done inside a computation, but don't create another runnable
fillArgs(actualArgs, keys, active);
}
} else {
if (descriptors.length > 0) {
pauseRecording();
try {
fillArgs(actualArgs, keys, active);
} finally {
resumeRecoding();
}
}
}
}
private void fillArgs(Object[] actualArgs, String[] keys, boolean[] active) {
for (int i = 0; i < keys.length; i++) {
if (keys[i] == null)
continue;
IEclipseContext targetContext = (active[i]) ? context.getActiveLeaf() : context;
if (ECLIPSE_CONTEXT_NAME.equals(keys[i]))
actualArgs[i] = targetContext;
else if (targetContext.containsKey(keys[i]))
actualArgs[i] = targetContext.get(keys[i]);
}
}
private String getKey(IObjectDescriptor descriptor) {
if (descriptor.hasQualifier(Named.class)) {
Named namedAnnotation = descriptor.getQualifier(Named.class);
return namedAnnotation.value();
}
Type elementType = descriptor.getDesiredType();
return typeToString(elementType);
}
private String typeToString(Type type) {
if (type == null)
return null;
if (type instanceof Class<?>)
return ((Class<?>) type).getName();
if (type instanceof ParameterizedType) {
Type rawType = ((ParameterizedType) type).getRawType();
return typeToString(rawType);
}
return null;
}
synchronized public void pauseRecording() {
Stack<Computation> current = EclipseContext.getCalculatedComputations();
current.push(null);
}
synchronized public void resumeRecoding() {
Stack<Computation> current = EclipseContext.getCalculatedComputations();
Computation plug = current.pop();
if (plug != null)
throw new IllegalArgumentException("Internal error in nested computation processing"); //$NON-NLS-1$
}
static public ContextObjectSupplier getObjectSupplier(IEclipseContext context, IInjector injector) {
if (context == null)
return null;
ContextObjectSupplier supplier = context.getLocal(ContextObjectSupplier.class);
if (supplier != null)
return supplier;
ContextObjectSupplier objectSupplier = new ContextObjectSupplier(context, injector);
context.set(ContextObjectSupplier.class, objectSupplier);
return objectSupplier;
}
}
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