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

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2013 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.objmap.graph.rules.range;
  13
  14 import java.lang.reflect.Field;
  15
  16 import org.apache.log4j.Logger;
  17 import org.simantics.objmap.exceptions.MappingException;
  18
  19
  20 /**
  21  * Accesses the given field of the element.
  22  * @author Hannu Niemistö
  23  */
  24 public class FieldAccessor<Range,T> implements IRangeAccessor<Range,T> {
  25
  26     static Logger LOGGER = Logger.getLogger("org.simantics.objmap");
  27
  28         Field field;
  29
  30         public FieldAccessor(Field field) {
  31                 this.field = field;
  32         }
  33
  34         @Override
  35         public T get(Range element) throws MappingException {
  36                 try {
  37                     @SuppressWarnings("unchecked")
  38                         T result = (T)field.get(element);
  39
  40                 if(LOGGER.isInfoEnabled())
  41                     LOGGER.info("        FieldAccessor.get " +
  42                             field.getName() + " -> " + result
  43                     );
  44
  45                         return result;
  46                 } catch (IllegalArgumentException e) {
  47                         throw new MappingException(e);
  48                 } catch (IllegalAccessException e) {
  49                         throw new MappingException(e);
  50                 }
  51         }
  52
  53         @Override
  54         public boolean set(Range element, T value) throws MappingException {
  55                 try {
  56                         Object currentValue = field.get(element);
  57
  58             if(LOGGER.isInfoEnabled())
  59                 LOGGER.info("        FieldAccessor.set " +
  60                         field.getName() + " " + currentValue +
  61                         " -> " + value
  62                 );
  63
  64                         if(value == null
  65                                 ? (currentValue == null || field.getType().isPrimitive())
  66                                 : value.equals(currentValue))
  67                                 return false;
  68                         field.set(element, value);
  69                         return true;
  70                 } catch (IllegalArgumentException e) {
  71                         throw new MappingException(e);
  72                 } catch (IllegalAccessException e) {
  73                         throw new MappingException(e);
  74                 }
  75         }
  76 }