org.simantics.objmap2/src/org/simantics/objmap/graph/rules/range/FieldAccessor.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2013 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.objmap.graph.rules.range;\r
  13 \r
  14 import java.lang.reflect.Field;\r
  15 \r
  16 import org.apache.log4j.Logger;\r
  17 import org.simantics.objmap.exceptions.MappingException;\r
  18 \r
  19 \r
  20 /**\r
  21  * Accesses the given field of the element.\r
  22  * @author Hannu Niemistö\r
  23  */\r
  24 public class FieldAccessor<Range,T> implements IRangeAccessor<Range,T> {\r
  25     \r
  26     static Logger LOGGER = Logger.getLogger("org.simantics.objmap");\r
  27     \r
  28         Field field;\r
  29 \r
  30         public FieldAccessor(Field field) {\r
  31                 this.field = field;\r
  32         }\r
  33 \r
  34         @Override\r
  35         public T get(Range element) throws MappingException {\r
  36                 try {\r
  37                     T result = (T)field.get(element);\r
  38                     \r
  39                 if(LOGGER.isInfoEnabled())\r
  40                     LOGGER.info("        FieldAccessor.get " +\r
  41                             field.getName() + " -> " + result\r
  42                     );\r
  43                 \r
  44                         return result;\r
  45                 } catch (IllegalArgumentException e) {\r
  46                         throw new MappingException(e);\r
  47                 } catch (IllegalAccessException e) {\r
  48                         throw new MappingException(e);\r
  49                 }\r
  50         }\r
  51 \r
  52         @Override\r
  53         public boolean set(Range element, T value) throws MappingException {\r
  54                 try {\r
  55                         Object currentValue = field.get(element);\r
  56                         \r
  57             if(LOGGER.isInfoEnabled())\r
  58                 LOGGER.info("        FieldAccessor.set " +\r
  59                         field.getName() + " " + currentValue +  \r
  60                         " -> " + value\r
  61                 );\r
  62                         \r
  63                         if(value == null \r
  64                                 ? (currentValue == null || field.getType().isPrimitive()) \r
  65                                 : value.equals(currentValue))\r
  66                                 return false;                   \r
  67                         field.set(element, value);\r
  68                         return true;\r
  69                 } catch (IllegalArgumentException e) {\r
  70                         throw new MappingException(e);\r
  71                 } catch (IllegalAccessException e) {\r
  72                         throw new MappingException(e);\r
  73                 }\r
  74         }       \r
  75 }\r