X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.browsing.ui.graph%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fgraph%2Fcontributor%2Fviewpoint%2FViewpointFactory.java;fp=bundles%2Forg.simantics.browsing.ui.graph%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fgraph%2Fcontributor%2Fviewpoint%2FViewpointFactory.java;h=c2c1487ae4a81cc8332b2289f4aa6fe51fef18ba;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.browsing.ui.graph/src/org/simantics/browsing/ui/graph/contributor/viewpoint/ViewpointFactory.java b/bundles/org.simantics.browsing.ui.graph/src/org/simantics/browsing/ui/graph/contributor/viewpoint/ViewpointFactory.java
new file mode 100644
index 000000000..c2c1487ae
--- /dev/null
+++ b/bundles/org.simantics.browsing.ui.graph/src/org/simantics/browsing/ui/graph/contributor/viewpoint/ViewpointFactory.java
@@ -0,0 +1,68 @@
+/*******************************************************************************
+ * 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.contributor.viewpoint;
+
+import java.util.Collection;
+
+import org.simantics.browsing.ui.BuiltinKeys;
+import org.simantics.browsing.ui.NodeContext;
+import org.simantics.browsing.ui.PrimitiveQueryUpdater;
+import org.simantics.browsing.ui.BuiltinKeys.ViewpointKey;
+import org.simantics.browsing.ui.content.Viewpoint;
+import org.simantics.browsing.ui.graph.impl.LazyViewpoint;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.exception.DatabaseException;
+
+/**
+ * Extend and implement {@link #getChildren(ReadGraph, NodeContext)} to create a
+ * viewpoint factory that reads from the graph database.
+ * 
+ * @author Antti Villberg
+ */
+public abstract class ViewpointFactory<T> implements org.simantics.browsing.ui.content.ViewpointFactory {
+
+    @Override
+    public Viewpoint create(PrimitiveQueryUpdater updater, NodeContext context, ViewpointKey key) {
+
+        return new LazyViewpoint(updater, context, key) {
+            @SuppressWarnings("unchecked")
+            @Override
+            public NodeContext[] children(ReadGraph graph) throws DatabaseException {
+
+                T input = (T) context.getConstant(BuiltinKeys.INPUT);
+
+                return toContextsWithInput(ViewpointFactory.this.
+                        children(graph, input));
+
+            }
+
+            @Override
+            public Boolean hasChildren(ReadGraph graph) throws DatabaseException {
+                return children(graph).length > 0;
+            }
+
+            @Override
+            public String toString() {
+                return ViewpointFactory.this.toString();
+            }
+
+            @Override
+            public Object getIdentity() {
+                return ViewpointFactory.this.getClass();
+            }
+        };
+
+    }
+
+    abstract protected Collection<?> children(ReadGraph g, T input) throws DatabaseException;
+
+}