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.BuiltinKeys;
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17 import org.simantics.browsing.ui.NodeContext;
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18 import org.simantics.browsing.ui.PrimitiveQueryUpdater;
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19 import org.simantics.browsing.ui.BuiltinKeys.ViewpointKey;
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20 import org.simantics.browsing.ui.content.Viewpoint;
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21 import org.simantics.browsing.ui.content.ViewpointFactory;
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22 import org.simantics.db.ReadGraph;
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23 import org.simantics.db.Resource;
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24 import org.simantics.db.exception.DatabaseException;
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26 public abstract class GraphViewpointFactory implements ViewpointFactory {
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29 public Viewpoint create(PrimitiveQueryUpdater updater,
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30 NodeContext context, ViewpointKey key) {
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31 assert(updater != null);
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32 assert(context != null);
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34 return new LazyViewpoint(updater, context, key) {
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36 public NodeContext[] children(ReadGraph graph) throws DatabaseException {
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37 return toContextsWithInput(GraphViewpointFactory.this.
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38 getChildren(graph, (Resource) context.getConstant(BuiltinKeys.INPUT)));
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42 public Boolean hasChildren(ReadGraph graph) throws DatabaseException {
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43 return children(graph).length > 0;
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47 public String toString() {
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48 return GraphViewpointFactory.this.toString();
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52 public Object getIdentity() {
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53 return GraphViewpointFactory.this.getClass();
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59 abstract protected Collection<?> getChildren(ReadGraph g, Resource r) throws DatabaseException;
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60 protected boolean hasChildren(ReadGraph g, Resource r) throws DatabaseException {
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61 return !getChildren(g, r).isEmpty();
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