X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;ds=inline;f=bundles%2Forg.simantics.browsing.ui.graph.impl%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fgraph%2Fimpl%2Fcontribution%2FCallbackViewpointContributionImpl.java;fp=bundles%2Forg.simantics.browsing.ui.graph.impl%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fgraph%2Fimpl%2Fcontribution%2FCallbackViewpointContributionImpl.java;h=94d6828000cc09b65a927b513a1ec2daff8128e2;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git
diff --git a/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/CallbackViewpointContributionImpl.java b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/CallbackViewpointContributionImpl.java
new file mode 100644
index 000000000..94d682800
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+++ b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/CallbackViewpointContributionImpl.java
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+/*******************************************************************************
+ * 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;
+ }
+
+}