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.common.viewpoints;
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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.common.NodeContextBuilder;
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20 import org.simantics.browsing.ui.common.NodeContextUtil;
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21 import org.simantics.browsing.ui.content.Viewpoint;
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24 * @author Tuukka Lehtonen
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26 public abstract class ViewpointStub implements Viewpoint {
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28 protected NodeContext[] children = Viewpoint.PENDING_CHILDREN;
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29 protected Boolean hasChildren = Viewpoint.PENDING_HAS_CHILDREN;
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31 final public void setChildren(PrimitiveQueryUpdater updater, NodeContext[] children) {
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32 if (children == null)
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33 throw new NullPointerException(this + ": null children produced by " + getClass().getName());
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34 for(NodeContext c : children) updater.incRef(c);
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35 for(NodeContext c : this.children) updater.decRef(c);
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36 this.children = children;
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39 public void setHasChildren(Boolean hasChildren) {
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40 if (children == null)
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41 throw new NullPointerException(this + ": null hasChildren produced by " + getClass().getName());
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42 this.hasChildren = hasChildren;
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46 * A utility method for transforming an array of objects into an
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47 * INodeContext array which is the return value of a ViewpointFactory.
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50 * The INodeContext's are constructed using
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51 * {@link NodeContextBuilder#buildWithInput(Object)}.
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55 * @return the specified children wrapped into simple <code>INodeContext</code>s
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57 public NodeContext[] toContextsWithInput(Object... children) {
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58 return NodeContextUtil.toContextsWithInput(children);
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62 * A utility method for transforming a collection of objects into an
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63 * INodeContext array which is the return value of a ViewpointFactory.
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66 * The INodeContext's are constructed using
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67 * {@link NodeContextBuilder#buildWithInput(Object)}.
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71 * @return the specified children wrapped into simple <code>INodeContext</code>s
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73 public NodeContext[] toContextsWithInput(Collection<?> children) {
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74 return NodeContextUtil.toContextsWithInput(children);
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78 * A utility method for transforming a collection of objects into an
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79 * INodeContext array which is the return value of a ViewpointFactory.
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82 * The INodeContext's are constructed using the specified factory.
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86 * @return the specified children wrapped into INodeContext's through the
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87 * specified <code>factory</code>
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89 public NodeContext[] toContexts(Collection<?> children, NodeContextUtil.NodeContextFactory factory) {
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90 return NodeContextUtil.toContexts(children, factory);
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96 * @return input of the specified class
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97 * @throws ClassCastException if the input class does not match the
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99 * @throws NullPointerException if the input is null
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101 @SuppressWarnings("unchecked")
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102 protected <T> T getInput(NodeContext context) {
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103 Object o = context.getConstant(BuiltinKeys.INPUT);
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105 throw new NullPointerException("null input");
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112 * @return <code>null</code> if input is <code>null</code> or if the class
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115 @SuppressWarnings("unchecked")
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116 protected <T> T tryGetInput(NodeContext context, Class<T> clazz) {
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117 Object o = context.getConstant(BuiltinKeys.INPUT);
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118 if (o != null && clazz.isInstance(o))
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