bundles/org.simantics.databoard/src/org/simantics/databoard/binding/reflection/AsmBindingProvider.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2011 Association for Decentralized Information Management in
   3  * 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.databoard.binding.reflection;
  13
  14 import java.lang.reflect.Constructor;
  15 import java.lang.reflect.InvocationTargetException;
  16 import java.util.WeakHashMap;
  17
  18 import org.simantics.databoard.binding.Binding;
  19 import org.simantics.databoard.binding.RecordBinding;
  20 import org.simantics.databoard.binding.error.BindingConstructionException;
  21 import org.simantics.databoard.type.RecordType;
  22
  23 /**
  24  * AsmBindingFactory creates code-generated bindings for classes.
  25  *
  26  * @author toni.kalajainen
  27  */
  28 public class AsmBindingProvider implements RecordBindingProvider {
  29
  30         WeakHashMap<ClassLoader, AsmBindingClassLoader> bindingClassLoaders = new WeakHashMap<ClassLoader, AsmBindingClassLoader>();
  31
  32         public AsmBindingProvider() {
  33         }
  34
  35         @Override
  36         public synchronized RecordBinding provideRecordBinding(Class<?> clazz, RecordType type)
  37                         throws BindingConstructionException {
  38
  39                 ClassLoader cl = clazz.getClassLoader();
  40                 if (cl == null) {
  41                         cl = Thread.currentThread().getContextClassLoader();
  42                 }
  43                 AsmBindingClassLoader bcl = bindingClassLoaders.get(cl);
  44                 if ( bcl == null ) {
  45                         bcl = new AsmBindingClassLoader(cl);
  46                         bindingClassLoaders.put(cl, bcl);
  47                 }
  48
  49                 ClassInfo ci = ClassInfo.getInfo(clazz);
  50                 try {
  51                         Class<?> bindingClass = bcl.getBindingClass( clazz );
  52                         Constructor<?> c = bindingClass.getConstructor( RecordType.class );
  53                         RecordBinding binding = (RecordBinding) c.newInstance( type );
  54                 binding.componentBindings = new Binding[ ci.fields.length ];
  55                         return binding;
  56                 } catch (InstantiationException e) {
  57                         throw new BindingConstructionException(e);
  58                 } catch (IllegalAccessException e) {
  59                         throw new BindingConstructionException(e);
  60                 } catch (SecurityException e) {
  61                         throw new BindingConstructionException(e);
  62                 } catch (NoSuchMethodException e) {
  63                         throw new BindingConstructionException(e);
  64                 } catch (IllegalArgumentException e) {
  65                         throw new BindingConstructionException(e);
  66                 } catch (InvocationTargetException e) {
  67                         throw new BindingConstructionException(e.getCause());
  68                 } catch (ClassNotFoundException e) {
  69                         throw new BindingConstructionException(e);
  70                 }
  71         }
  72
  73 }