bundles/org.simantics.databoard/src/org/simantics/databoard/binding/impl/ThrowableBinding.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2011 Association for Decentralized Information Management in\r
   3  * 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.databoard.binding.impl;\r
  13 \r
  14 import java.lang.reflect.Constructor;\r
  15 import java.lang.reflect.InvocationTargetException;\r
  16 \r
  17 import org.simantics.databoard.Bindings;\r
  18 import org.simantics.databoard.Datatypes;\r
  19 import org.simantics.databoard.binding.Binding;\r
  20 import org.simantics.databoard.binding.RecordBinding;\r
  21 import org.simantics.databoard.binding.error.BindingConstructionException;\r
  22 import org.simantics.databoard.binding.error.BindingException;\r
  23 import org.simantics.databoard.type.OptionalType;\r
  24 import org.simantics.databoard.type.RecordType;\r
  25 \r
  26 /**\r
  27  * This class Binds throwables to the following record: \r
  28  *   { detailMessage : Optional(String) }\r
  29  *   \r
  30  * The bound throwable class must have constructor( String ).\r
  31  *\r
  32  * @author toni.kalajainen\r
  33  */\r
  34 public class ThrowableBinding extends RecordBinding {\r
  35 \r
  36         private Class<Throwable> boundClass;\r
  37         private Constructor<Throwable> constructor;\r
  38         private Constructor<Throwable> constructorNoArgs;\r
  39         \r
  40         public ThrowableBinding( Class<Throwable> classToBindTo ) throws BindingConstructionException {\r
  41                 this.boundClass = classToBindTo;\r
  42                 type = new RecordType();\r
  43                 RecordType rt = (RecordType) type;\r
  44                 rt.addComponent("detailMessage", new OptionalType( Datatypes.STRING ));         \r
  45                 this.componentBindings = new Binding[1];\r
  46                 this.componentBindings[0] = new OptionalBindingDefault( Bindings.STRING );\r
  47                 try {\r
  48                         constructor = boundClass.getConstructor( String.class );\r
  49                         constructor.setAccessible( true );\r
  50                 } catch (SecurityException e) {\r
  51                         throw new BindingConstructionException( e );\r
  52                 } catch (NoSuchMethodException e) {\r
  53                         throw new BindingConstructionException( e );\r
  54                 }\r
  55                 \r
  56                 try {\r
  57                         constructorNoArgs = boundClass.getConstructor();\r
  58                         constructorNoArgs.setAccessible( true );\r
  59                 } catch (SecurityException e) {\r
  60                 } catch (NoSuchMethodException e) {\r
  61                 }\r
  62                 \r
  63         }\r
  64 \r
  65         @Override\r
  66         public Object getComponent(Object obj, int index) throws BindingException {\r
  67                 if ( index != 0 ) throw new BindingException("Index out of range");\r
  68                 if ( obj instanceof Throwable == false ) throw new BindingException("not Throwable");\r
  69                 Throwable t = (Throwable) obj;\r
  70                 return t.getMessage();\r
  71         }\r
  72 \r
  73         @Override\r
  74         public Object create(Object... values) throws BindingException {\r
  75                 if (values.length!=1) throw new BindingException("Invalid argument");\r
  76                 try {\r
  77                         return constructor.newInstance( values );\r
  78                 } catch (IllegalArgumentException e) {\r
  79                         throw new BindingException( e ); \r
  80                 } catch (InstantiationException e) {\r
  81                         throw new BindingException( e ); \r
  82                 } catch (IllegalAccessException e) {\r
  83                         throw new BindingException( e ); \r
  84                 } catch (InvocationTargetException e) {\r
  85                         throw new BindingException( e.getCause() ); \r
  86                 }\r
  87         }\r
  88 \r
  89         @Override\r
  90         public Object createPartial() throws BindingException {\r
  91                 if ( constructorNoArgs!=null ) {\r
  92                         try {\r
  93                                 return constructorNoArgs.newInstance();\r
  94                         } catch (IllegalArgumentException e) {\r
  95                                 throw new BindingException( e );\r
  96                         } catch (InstantiationException e) {\r
  97                                 throw new BindingException( e );\r
  98                         } catch (IllegalAccessException e) {\r
  99                                 throw new BindingException( e );\r
 100                         } catch (InvocationTargetException e) {\r
 101                                 throw new BindingException( e.getCause() );\r
 102                         }\r
 103                 }\r
 104                 \r
 105                 try {\r
 106                         return constructor.newInstance((Object[]) null);\r
 107                 } catch (IllegalArgumentException e) {\r
 108                         throw new BindingException( e );\r
 109                 } catch (InstantiationException e) {\r
 110                         throw new BindingException( e );\r
 111                 } catch (IllegalAccessException e) {\r
 112                         throw new BindingException( e );\r
 113                 } catch (InvocationTargetException e) {\r
 114                         throw new BindingException( e.getCause() );\r
 115                 }\r
 116         }\r
 117 \r
 118         @Override\r
 119         public void setComponents(Object obj, Object... value)\r
 120                         throws BindingException {\r
 121 //              if ( value.length != 1 ) throw new BindingException("Array out of range");\r
 122 //              if ( obj instanceof Throwable == false ) throw new BindingException("not Throwable");\r
 123 //              Throwable t = (Throwable) obj;\r
 124                 throw new BindingException("Cannot set message to Throwable");\r
 125         }\r
 126 \r
 127         @Override\r
 128         public void setComponent(Object obj, int index, Object value)\r
 129                         throws BindingException {\r
 130                 throw new BindingException("Cannot set message to Throwable");\r
 131         }\r
 132 \r
 133         @Override\r
 134         public boolean isInstance(Object obj) {\r
 135                 return obj instanceof Throwable;\r
 136         }\r
 137 \r
 138         @Override\r
 139         protected boolean baseEquals(Object obj) {\r
 140                 ThrowableBinding o = (ThrowableBinding)obj;\r
 141                 return super.baseEquals(obj) && o.boundClass.equals(boundClass);\r
 142         }\r
 143         \r
 144         @Override\r
 145         public int baseHashCode() {\r
 146                 return super.baseHashCode() + 13 * boundClass.hashCode();\r
 147         }\r
 148 }\r