/*******************************************************************************
* Copyright (c) 2007, 2010 Association for Decentralized Information Management
* in Industry THTH ry.
* 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:
* VTT Technical Research Centre of Finland - initial API and implementation
*******************************************************************************/
package org.simantics.browsing.ui.graph.impl.contribution;
import java.util.Collection;
import java.util.function.Consumer;
import org.simantics.browsing.ui.BuiltinKeys;
import org.simantics.browsing.ui.BuiltinKeys.ViewpointContributionKey;
import org.simantics.browsing.ui.DataSource;
import org.simantics.browsing.ui.NodeContext;
import org.simantics.browsing.ui.PrimitiveQueryUpdater;
import org.simantics.browsing.ui.Tester;
import org.simantics.browsing.ui.common.NodeContextUtil;
import org.simantics.db.AsyncReadGraph;
import org.simantics.db.ReadGraph;
import org.simantics.db.common.request.ReadRequest;
import org.simantics.db.exception.DatabaseException;
import org.simantics.utils.ui.ErrorLogger;
/**
* Implement {@link #children(AsyncReadGraph)} and {@link #hasChildren(AsyncReadGraph)}.
*
* @author Tuukka Lehtonen
*/
abstract public class CallbackViewpointContributionImpl extends ContributionStub {
/**
* @param graph
* @param context
* @return a collection of contributions, must not be null
* @throws DatabaseException
*/
abstract public void children(ReadGraph graph, NodeContext context, Consumer> callback) throws DatabaseException;
public CallbackViewpointContributionImpl(PrimitiveQueryUpdater updater,
NodeContext context, ViewpointContributionKey key) {
assert updater != null;
assert context != null;
assert key != null;
this.updater = updater;
this.context = context;
this.key = key;
}
final protected PrimitiveQueryUpdater updater;
final private NodeContext context;
final private BuiltinKeys.ViewpointContributionKey key;
public NodeContext getContext() {
return context;
}
@Override
public Collection getContribution() {
//System.out.println("LazyViewpoint2@" + System.identityHashCode(this) + " getChildren() = " + children.length);
if (children == org.simantics.browsing.ui.content.ViewpointContribution.PENDING_CONTRIBUTION) {
DataSource source = updater.getDataSource(ReadGraph.class);
if (source != null) {
source.schedule(graph -> {
ReadRequest childQuery = new ReadRequest() {
@Override
public void run(ReadGraph graph) throws DatabaseException {
try {
children(graph, context,
result -> replaceChildrenResult(NodeContextUtil.toContextCollectionWithInput(CallbackViewpointContributionImpl.this, result)));
} catch (DatabaseException e) {
throw e;
} catch (Throwable t) {
ErrorLogger.defaultLogError("LazyContributionImpl.childQuery produced unexpected exception.", t);
}
}
@Override
public String toString() {
return "LazyContributionImpl[" + System.identityHashCode(CallbackViewpointContributionImpl.this) + "].childQuery";
}
};
graph.asyncRequest(childQuery);
});
}
}
//System.out.println("LazyViewpoint.getChildren returns " + children);
return children;
}
protected void replaceChildrenResult(Collection result) {
setChildren(updater, result);
updater.scheduleReplace(context, key, this);
}
/**
* @param
* @param clazz
* @return input of the specified class
* @throws ClassCastException if the input class does not match the
* specified class
* @throws NullPointerException if the input is null
*/
@SuppressWarnings("unchecked")
protected T getInput(Class clazz) throws ClassCastException {
Object o = context.getConstant(BuiltinKeys.INPUT);
if (o == null)
throw new NullPointerException("null input");
// return clazz.cast(o);
return (T) o;
}
/**
* @param
* @param clazz
* @return null
if input is null
or if the class does not match
*/
@SuppressWarnings("unchecked")
protected T tryGetInput(Class clazz) {
Object o = context.getConstant(BuiltinKeys.INPUT);
if (o != null && clazz.isInstance(o))
// return clazz.cast(o);
return (T) o;
return null;
}
@Override
public Tester getNodeContextTester() {
return null;
}
}