1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.browsing.ui.graph.contributor.viewpoint;
14 import java.util.Collection;
16 import org.simantics.browsing.ui.BuiltinKeys;
17 import org.simantics.browsing.ui.NodeContext;
18 import org.simantics.browsing.ui.PrimitiveQueryUpdater;
19 import org.simantics.browsing.ui.BuiltinKeys.ViewpointKey;
20 import org.simantics.browsing.ui.content.Viewpoint;
21 import org.simantics.browsing.ui.graph.impl.LazyViewpoint;
22 import org.simantics.db.ReadGraph;
23 import org.simantics.db.exception.DatabaseException;
26 * Extend and implement {@link #getChildren(ReadGraph, NodeContext)} to create a
27 * viewpoint factory that reads from the graph database.
29 * @author Antti Villberg
31 public abstract class ViewpointFactory<T> implements org.simantics.browsing.ui.content.ViewpointFactory {
34 public Viewpoint create(PrimitiveQueryUpdater updater, NodeContext context, ViewpointKey key) {
36 return new LazyViewpoint(updater, context, key) {
37 @SuppressWarnings("unchecked")
39 public NodeContext[] children(ReadGraph graph) throws DatabaseException {
41 T input = (T) context.getConstant(BuiltinKeys.INPUT);
43 return toContextsWithInput(ViewpointFactory.this.
44 children(graph, input));
49 public Boolean hasChildren(ReadGraph graph) throws DatabaseException {
50 return children(graph).length > 0;
54 public String toString() {
55 return ViewpointFactory.this.toString();
59 public Object getIdentity() {
60 return ViewpointFactory.this.getClass();
66 abstract protected Collection<?> children(ReadGraph g, T input) throws DatabaseException;