Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.browsing.ui.graph.impl / src / org / simantics / browsing / ui / graph / impl / EnumerationVariableModifier.java

diff --git a/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/EnumerationVariableModifier.java b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/EnumerationVariableModifier.java
new file mode 100644 (file)
index 0000000..42fa404
--- /dev/null
+++ b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/EnumerationVariableModifier.java
@@ -0,0 +1,110 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.browsing.ui.graph.impl;\r
+\r
+import java.util.List;\r
+\r
+import org.simantics.browsing.ui.content.Labeler.EnumerationModifier;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.RequestProcessor;\r
+import org.simantics.db.Session;\r
+import org.simantics.db.UndoContext;\r
+import org.simantics.db.common.request.ReadRequest;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.layer0.variable.Variable;\r
+import org.simantics.db.layer0.variable.VariableWrite;\r
+import org.simantics.utils.datastructures.Callback;\r
+import org.simantics.utils.ui.ErrorLogger;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class EnumerationVariableModifier implements EnumerationModifier {\r
+\r
+    protected final Session      session;\r
+    protected final UndoContext  undoContext;\r
+    protected final Variable     variable;\r
+    protected final List<String> allowedValues;\r
+    protected final String       defaultValue;\r
+\r
+    private String             initialValue;\r
+    protected Throwable        modifierFailed;\r
+\r
+    public EnumerationVariableModifier(RequestProcessor processor, UndoContext undoContext, Variable variable,\r
+            List<String> allowedValues, String defaultValue) {\r
+        this.session = processor.getSession();\r
+        this.undoContext = undoContext;\r
+        this.variable = variable;\r
+        this.allowedValues = allowedValues;\r
+        this.defaultValue = defaultValue;\r
+\r
+        initializeModifier(processor);\r
+    }\r
+\r
+    protected void initializeModifier(RequestProcessor processor) {\r
+        try {\r
+            processor.syncRequest(new ReadRequest() {\r
+                @Override\r
+                public void run(ReadGraph graph) throws DatabaseException {\r
+                    initialValue = getInitialValue(graph);\r
+                }\r
+            });\r
+        } catch (DatabaseException e) {\r
+            modifierFailed = e;\r
+        }\r
+    }\r
+\r
+    protected void doModify(final String label) {\r
+        session.asyncRequest(new VariableWrite(variable, label, null, null),\r
+                new Callback<DatabaseException>() {\r
+            @Override\r
+            public void run(DatabaseException parameter) {\r
+                if (parameter != null)\r
+                    ErrorLogger.defaultLogError(parameter);\r
+            }\r
+        });\r
+    }\r
+\r
+    protected String getInitialValue(ReadGraph graph) throws DatabaseException {\r
+        Object value = variable.getValue(graph);\r
+        return value == null ? defaultValue : value.toString();\r
+    }\r
+\r
+    @Override\r
+    public String getValue() {\r
+        return initialValue;\r
+    }\r
+\r
+    @Override\r
+    public String isValid(String label) {\r
+        if (modifierFailed != null)\r
+            return "Could not resolve validator for this value, modification denied. Reason: "\r
+            + modifierFailed.getMessage();\r
+        // Validity should already be enforced by the editing UI for\r
+        // enumerations.\r
+        return null;\r
+    }\r
+\r
+    @Override\r
+    public final void modify(String label) {\r
+        if (modifierFailed != null)\r
+            // Should never end up here, isValid should prevent it.\r
+            throw new Error("modifier failed: " + modifierFailed.getMessage());\r
+        doModify(label);\r
+    }\r
+\r
+    @Override\r
+    public List<String> getValues() {\r
+        return allowedValues;\r
+    }\r
+\r
+};\r