X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=blobdiff_plain;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;hp=0000000000000000000000000000000000000000;hb=969bd23cab98a79ca9101af33334000879fb60c5;hpb=866dba5cd5a3929bbeae85991796acb212338a08

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
@@ -0,0 +1,148 @@
+/*******************************************************************************
+ * 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 <code>null</code>
+     * @throws DatabaseException
+     */
+    abstract public void children(ReadGraph graph, NodeContext context, Consumer<Collection<?>> 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<NodeContext> getContribution() {
+
+        //System.out.println("LazyViewpoint2@" + System.identityHashCode(this) + " getChildren() = " + children.length);
+
+        if (children == org.simantics.browsing.ui.content.ViewpointContribution.PENDING_CONTRIBUTION) {
+            DataSource<ReadGraph> 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<NodeContext> result) {
+        setChildren(updater, result);
+        updater.scheduleReplace(context, key, this);
+    }
+
+    /**
+     * @param <T>
+     * @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> T getInput(Class<T> 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 <T>
+     * @param clazz
+     * @return <code>null</code> if input is <code>null</code> or if the class does not match
+     */
+    @SuppressWarnings("unchecked")
+    protected <T> T tryGetInput(Class<T> 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;
+    }
+
+}