+/*******************************************************************************\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