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