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%2FFinalImagerContributionImpl.java;fp=bundles%2Forg.simantics.browsing.ui.graph.impl%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fgraph%2Fimpl%2Fcontribution%2FFinalImagerContributionImpl.java;h=aa3f203be2656f92ada49966c966b509dc3ed057;hp=0000000000000000000000000000000000000000;hb=969bd23cab98a79ca9101af33334000879fb60c5;hpb=866dba5cd5a3929bbeae85991796acb212338a08

diff --git a/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/FinalImagerContributionImpl.java b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/FinalImagerContributionImpl.java
new file mode 100644
index 000000000..aa3f203be
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+++ b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/FinalImagerContributionImpl.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.Collections;
+import java.util.Map;
+
+import org.eclipse.jface.resource.ImageDescriptor;
+import org.simantics.browsing.ui.BuiltinKeys;
+import org.simantics.browsing.ui.BuiltinKeys.ImagerKey;
+import org.simantics.browsing.ui.DataSource;
+import org.simantics.browsing.ui.NodeContext;
+import org.simantics.browsing.ui.PrimitiveQueryUpdater;
+import org.simantics.browsing.ui.content.Imager;
+import org.simantics.browsing.ui.graph.impl.request.ResourceQuery;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.layer0.exception.PendingVariableException;
+import org.simantics.db.procedure.Listener;
+import org.simantics.db.procedure.Procedure;
+import org.simantics.utils.ui.ErrorLogger;
+
+public abstract class FinalImagerContributionImpl implements Imager {
+
+    private final static Map<String, ImageDescriptor>         PENDING = Collections.emptyMap();
+
+    protected final PrimitiveQueryUpdater                     updater;
+    private final ResourceQuery<Map<String, ImageDescriptor>> imagerQuery;
+    
+    protected final NodeContext                                 context;
+    private final BuiltinKeys.ImagerKey                       key;
+
+    protected Map<String, ImageDescriptor>                      content = null;
+
+    public Object getIdentity(ImagerKey key) {
+        return key;
+    }
+
+    public FinalImagerContributionImpl(final PrimitiveQueryUpdater updater, final NodeContext context, final ImagerKey key) {
+
+        this.updater = updater;
+        this.context = context;
+        this.key = key;
+
+        imagerQuery = new ResourceQuery<Map<String, ImageDescriptor>>(getIdentity(key), context) {
+
+            @Override
+            public Map<String, ImageDescriptor> perform(ReadGraph graph) throws DatabaseException {
+                try {
+                    return getDescriptors(graph, context);
+                } catch (PendingVariableException e) {
+                    return PENDING;
+                } catch (DatabaseException e) {
+                    throw e;
+                } catch (Throwable t) {
+                    ErrorLogger.defaultLogError("LazyGraphLabeler.labelQuery produced unexpected exception.", t);
+                    return null;
+                }
+            }
+
+            @Override
+            public String toString() {
+                return FinalImagerContributionImpl.this + " with context " + context;
+            }
+
+        };
+
+    }
+
+    protected Procedure<Map<String, ImageDescriptor>> createProcedure() {
+
+        return new Procedure<Map<String, ImageDescriptor>>() {
+
+            @Override
+            public void execute(Map<String, ImageDescriptor> result) {
+                replaceResult(result);
+            }
+
+            @Override
+            public void exception(Throwable t) {
+                ErrorLogger.defaultLogError("FinalImagerContributionImpl.imagerQuery failed, see exception for details.", t);
+            }
+
+        };
+
+    }
+
+    protected void replaceResult(Map<String, ImageDescriptor> desc) {
+        content = desc;
+        updater.scheduleReplace(context, key, this);
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public ImageDescriptor getImage(String key) {
+    	
+        if (content == null) {
+
+            content = PENDING;
+
+            final DataSource<ReadGraph> source = updater.getDataSource(ReadGraph.class);
+            assert(source != null);
+
+            final Procedure<Map<String, ImageDescriptor>> procedure = createProcedure();
+            source.schedule(graph -> {
+                if(procedure instanceof Listener<?>)
+                    graph.asyncRequest(imagerQuery, (Listener<Map<String, ImageDescriptor>>)procedure);
+                else
+                    graph.asyncRequest(imagerQuery, procedure);
+            });
+
+            return null;
+
+        }
+
+        ImageDescriptor descriptor = content.get(key);
+        return descriptor;
+    }
+
+    // OVERRIDE
+
+    public abstract Map<String, ImageDescriptor> getDescriptors(ReadGraph graph, NodeContext context) throws DatabaseException;
+
+}