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%2FFinalLabelDecoratorContributionImpl.java;fp=bundles%2Forg.simantics.browsing.ui.graph.impl%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fgraph%2Fimpl%2Fcontribution%2FFinalLabelDecoratorContributionImpl.java;h=348e823ba93057c0a0aa5eaace08450b9ad6f11d;hp=0000000000000000000000000000000000000000;hb=969bd23cab98a79ca9101af33334000879fb60c5;hpb=866dba5cd5a3929bbeae85991796acb212338a08

diff --git a/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/FinalLabelDecoratorContributionImpl.java b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/FinalLabelDecoratorContributionImpl.java
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+++ b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/FinalLabelDecoratorContributionImpl.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 org.simantics.browsing.ui.BuiltinKeys.LabelDecoratorKey;
+import org.simantics.browsing.ui.DataSource;
+import org.simantics.browsing.ui.NodeContext;
+import org.simantics.browsing.ui.PrimitiveQueryUpdater;
+import org.simantics.browsing.ui.content.LabelDecorator;
+import org.simantics.browsing.ui.graph.impl.request.ResourceQuery;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.procedure.Listener;
+import org.simantics.db.procedure.Procedure;
+import org.simantics.utils.ui.ErrorLogger;
+
+public abstract class FinalLabelDecoratorContributionImpl extends LabelDecorator.Stub {
+
+    final LabelDecorator FRESH = new LabelDecorator.Stub();
+    final LabelDecorator PENDING = new LabelDecorator.Stub();
+    final LabelDecorator NO_DECORATION = new LabelDecorator.Stub();
+
+    protected final PrimitiveQueryUpdater       updater;
+    private final ResourceQuery<LabelDecorator> labelQuery;
+    private final LabelDecoratorKey             key;
+
+    /**
+     * The current decorator result produced for this contribution. The value
+     * should never be <code>null</code>, but one of {@link #FRESH},
+     * {@link #PENDING}, {@link #NO_DECORATION} instead.
+     */
+    protected LabelDecorator                      decorator = FRESH;
+
+    final protected NodeContext                   context;
+
+    public Object getIdentity(LabelDecoratorKey key) {
+        return key;
+    }
+
+    private void request() {
+
+        final DataSource<ReadGraph> source = updater.getDataSource(ReadGraph.class);
+        assert(source != null);
+        
+        final Procedure<LabelDecorator> procedure = createProcedure();
+
+        source.schedule(graph -> {
+            if(procedure instanceof Listener<?>)
+                graph.asyncRequest(labelQuery, (Listener<LabelDecorator>)procedure);
+            else
+                graph.asyncRequest(labelQuery, procedure);
+        });
+
+    }
+
+
+
+    @Override
+    public <Color_> Color_ decorateBackground(Color_ color, String column, int itemIndex) {
+        if(FRESH == decorator) {
+            decorator = PENDING;
+            request();
+        }
+        return decorator.decorateBackground(color, column, itemIndex);
+    }
+
+    @Override
+    public <Font_> Font_ decorateFont(Font_ font, String column, int itemIndex) {
+        if(FRESH == decorator) {
+            decorator = PENDING;
+            request();
+        }
+        return decorator.decorateFont(font, column, itemIndex);
+    }
+
+    @Override
+    public String decorateLabel(String label, String column, int itemIndex) {
+        if(FRESH == decorator) {
+            decorator = PENDING;
+            request();
+        }
+        return decorator.decorateLabel(label, column, itemIndex);
+    }
+
+    @Override
+    public <Color_> Color_ decorateForeground(Color_ color, String column, int itemIndex) {
+        if(FRESH == decorator) {
+            decorator = PENDING;
+            request();
+        }
+        return decorator.decorateForeground(color, column, itemIndex);
+    }
+
+    public FinalLabelDecoratorContributionImpl(final PrimitiveQueryUpdater updater, final NodeContext context, final LabelDecoratorKey key) {
+
+        this.updater = updater;
+        this.context = context;
+        this.key = key;
+
+        labelQuery = new ResourceQuery<LabelDecorator>(getIdentity(key), context) {
+
+            @Override
+            public LabelDecorator perform(ReadGraph graph) throws DatabaseException {
+                try {
+                    return getDecorator(graph, context);
+                } catch (DatabaseException e) {
+                    throw e;
+                } catch (Throwable t) {
+                    ErrorLogger.defaultLogError("LazyGraphLabeler.labelQuery produced unexpected exception.", t);
+                    return null;
+                }
+            }
+
+            @Override
+            public String toString() {
+                return FinalLabelDecoratorContributionImpl.this + " with context " + context;
+            }
+
+        };
+
+    }
+
+    protected Procedure<LabelDecorator> createProcedure() {
+
+        return new Procedure<LabelDecorator>() {
+
+            @Override
+            public void execute(LabelDecorator result) {
+                replaceResult(result);
+            }
+
+            @Override
+            public void exception(Throwable t) {
+                ErrorLogger.defaultLogError("LazyContributionImpl.childQuery failed, see exception for details.", t);
+            }
+
+        };
+
+    }
+
+    protected void replaceResult(LabelDecorator result) {
+        // Never let decorator become null, use a stub decorator instead.
+        if (result == null)
+            result = NO_DECORATION;
+
+        decorator = result;
+        updater.scheduleReplace(context, key, this);
+    }
+
+    // OVERRIDE
+
+    public abstract LabelDecorator getDecorator(ReadGraph graph, NodeContext context) throws DatabaseException;
+
+}