Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.g2d / src / org / simantics / g2d / canvas / impl / DependencyReflection.java

diff --git a/bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/DependencyReflection.java b/bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/DependencyReflection.java
new file mode 100644 (file)
index 0000000..d451754
--- /dev/null
+++ b/bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/DependencyReflection.java
@@ -0,0 +1,101 @@
+/*******************************************************************************\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.g2d.canvas.impl;\r
+\r
+import java.lang.annotation.ElementType;\r
+import java.lang.annotation.Retention;\r
+import java.lang.annotation.RetentionPolicy;\r
+import java.lang.annotation.Target;\r
+import java.lang.reflect.Field;\r
+import java.util.ArrayList;\r
+import java.util.Collection;\r
+import java.util.List;\r
+\r
+import org.simantics.g2d.canvas.ICanvasParticipant;\r
+import org.simantics.g2d.diagram.handler.DiagramHandler;\r
+\r
+/**\r
+ * @author Toni Kalajainen\r
+ */\r
+public class DependencyReflection {\r
+\r
+       private final static ReferenceDefinition[] EMPTY = new ReferenceDefinition[0]; \r
+       \r
+       @Retention(RetentionPolicy.RUNTIME)\r
+       @Target(ElementType.FIELD)\r
+       public static @interface Dependency {}\r
+       @Retention(RetentionPolicy.RUNTIME)\r
+       @Target(ElementType.FIELD)\r
+       public static @interface Reference {}\r
+       \r
+       /**\r
+        * Scans an object with reflection for all dependencies \r
+        * <p>\r
+        * Example:\r
+        * \r
+        * @Dependency\r
+        * ViewportInteractor vi;\r
+        * \r
+        * @param obj object to scan\r
+        * @return an array of painters and their priorities\r
+        */\r
+       public static ReferenceDefinition[] getDependencies(final Object obj, ReferenceType type)\r
+       {\r
+               List<ReferenceDefinition> result = new ArrayList<ReferenceDefinition>();\r
+               Class<?> clazz = obj.getClass();\r
+               _addDependencies(clazz, result, type);\r
+               //if (result==null) return EMPTY;\r
+               return result.toArray(EMPTY);\r
+       }\r
+\r
+    private static void _addDependencies(Class<?> clazz, Collection<ReferenceDefinition> result, ReferenceType type)\r
+       {\r
+               for (final Field f : clazz.getDeclaredFields()) {\r
+                       Class<?> c = f.getType();\r
+                       Dependency dep = (Dependency) f.getAnnotation(Dependency.class);\r
+                       Reference ref = (Reference) f.getAnnotation(Reference.class);\r
+                       if (dep==null && ref==null) continue;\r
+                       ReferenceType referenceType = null;                     \r
+                       if ( ICanvasParticipant.class.isAssignableFrom( c ) )\r
+                               referenceType = ReferenceType.CanvasParticipant;\r
+                       else if ( DiagramHandler.class.isAssignableFrom( c ) )\r
+                               referenceType = ReferenceType.DiagramHandler;\r
+                       else assert(false);\r
+                       if (referenceType!=type) continue;\r
+                       \r
+                       assert(!(dep!=null && ref!=null));\r
+                       ReferenceDefinition rd = new ReferenceDefinition();\r
+                       rd.dependency = dep!=null;\r
+                       rd.field = f;\r
+                       rd.requirement = c;\r
+                       rd.referenceType = referenceType;\r
+                       \r
+                       f.setAccessible(true);\r
+                       result.add(rd);\r
+               }\r
+               Class<?> superClass = clazz.getSuperclass();\r
+               if (superClass!=null)\r
+                       _addDependencies(superClass, result, type);\r
+       }\r
+       \r
+       public final static class ReferenceDefinition {\r
+               public Class<?> requirement;\r
+               public Field field;\r
+               public boolean dependency;\r
+               public ReferenceType referenceType; \r
+       }       \r
+       \r
+       public static enum ReferenceType {\r
+               CanvasParticipant, DiagramHandler\r
+       }\r
+       \r
+}\r