Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.objmap2 / src / org / simantics / objmap / graph / rules / range / ListAccessor.java

diff --git a/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/range/ListAccessor.java b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/range/ListAccessor.java
new file mode 100644 (file)
index 0000000..5f79c58
--- /dev/null
+++ b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/range/ListAccessor.java
@@ -0,0 +1,94 @@
+/*******************************************************************************\r
+ * Copyright (c) 2012, 2013 Association for Decentralized Information Management in\r
+ * 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.objmap.graph.rules.range;\r
+\r
+import java.lang.reflect.InvocationTargetException;\r
+import java.lang.reflect.Method;\r
+import java.util.ArrayList;\r
+import java.util.Collection;\r
+\r
+import org.simantics.objmap.exceptions.MappingException;\r
+import org.simantics.utils.datastructures.Pair;\r
+\r
+\r
+/**\r
+ * Accessor for mapped collections. \r
+ * Uses three methods:\r
+ * - Getter: returns the collection.\r
+ * - Adder: adds one item into the collection.\r
+ * - Remover: removes one item from the collection. \r
+ * \r
+ * @author Marko Luukkainen <marko.luukkainen@vtt.fi>\r
+ *\r
+ * @param <T>\r
+ */\r
+public class ListAccessor<Range,T>  implements IRangeAccessor<Range,Collection<T>> {\r
+       \r
+       private Method getter;\r
+       private Method adder;\r
+       private Method remover;\r
+       \r
+       public ListAccessor(Method getter, Method adder, Method remover) {\r
+               this.getter = getter;\r
+               this.adder = adder;\r
+               this.remover = remover;\r
+       }\r
+       \r
+       @SuppressWarnings("unchecked")\r
+       public java.util.Collection<T> get(Object element) throws MappingException {\r
+               try {\r
+                       return (Collection<T>) getter.invoke(element);\r
+               } catch (IllegalArgumentException e) {\r
+                       throw new MappingException(e);\r
+               } catch (IllegalAccessException e) {\r
+                       throw new MappingException(e);\r
+               } catch (InvocationTargetException e) {\r
+                       throw new MappingException(e);\r
+               }\r
+       };\r
+\r
+       @Override\r
+       public boolean set(Range element, Collection<T> value)\r
+                       throws MappingException {\r
+               java.util.Collection<T> current = get(element);\r
+               Collection<Pair<Integer, T>> adding = new ArrayList<Pair<Integer, T>>();\r
+               Collection<T> removing = new ArrayList<T>();\r
+               for (T e : current) {\r
+                       if (!value.contains(e))\r
+                               removing.add(e);\r
+               }\r
+               int i = 0;\r
+               for (T e : value) {\r
+                       if (!current.contains(e))\r
+                               adding.add(new Pair<Integer, T>(i, e));\r
+                       i++;\r
+               }\r
+               \r
+               try {\r
+                       for (T e : removing) {\r
+                               remover.invoke(element, e);\r
+                       }\r
+                       \r
+                       for (Pair<Integer,T> e : adding) {\r
+                               adder.invoke(element, e.first,e.second);\r
+                       }\r
+               } catch (IllegalArgumentException e) {\r
+                       throw new MappingException(e);\r
+               } catch (IllegalAccessException e) {\r
+                       throw new MappingException(e);\r
+               } catch (InvocationTargetException e) {\r
+                       throw new MappingException(e);\r
+               }\r
+               return removing.size() > 0 || adding.size() > 0;\r
+               \r
+       }\r
+}\r