bundles/org.simantics.db.services/src/org/simantics/db/services/adaption/reflection/AdaptingDynamicAdapter2.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 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.db.services.adaption.reflection;
  13
  14 import java.util.ArrayList;
  15 import java.util.Collection;
  16
  17 import org.simantics.db.ReadGraph;
  18 import org.simantics.db.Resource;
  19 import org.simantics.db.exception.AdaptionException;
  20 import org.simantics.db.exception.DatabaseException;
  21
  22 public class AdaptingDynamicAdapter2 implements IDynamicAdapter2 {
  23
  24     IDynamicAdapter2 adapter;
  25     Class<?> targetType;
  26
  27     public AdaptingDynamicAdapter2(IDynamicAdapter2 adapter, Class<?> targetType) {
  28         this.adapter = adapter;
  29         this.targetType = targetType;
  30     }
  31
  32     @Override
  33     public Object adapt(ReadGraph g, Resource r) throws DatabaseException {
  34         Object obj = adapter.adapt(g, r);
  35         if(obj == null)
  36             return null;
  37         if(obj instanceof Resource)
  38             return g.adapt((Resource)obj, targetType);
  39         if(obj instanceof Collection<?>) {
  40             Collection<?> c = (Collection<?>)obj;
  41             Collection<Object> ret = new ArrayList<Object>(c.size());
  42             for(Object o : c)
  43                 ret.add(g.adapt((Resource)o, targetType));
  44             return ret;
  45         }
  46         throw new AdaptionException("Invalid type.");
  47     }
  48
  49     @Override
  50     public Class<?> getType() throws DatabaseException {
  51         if(adapter.getType().equals(Resource.class))
  52             return targetType;
  53         else if(adapter.getType().equals(Collection.class))
  54             return Collection.class;
  55         else
  56             throw new AdaptionException("Invalid type.");
  57     }
  58
  59 }