/*
    *  Copyright 2010, 2011 Chris Pheby
    *
    *  Licensed under the Apache License, Version 2.0 (the "License");
    *  you may not use this file except in compliance with the License.
    *  You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
    *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   */
  package org.jadira.bindings.core.general.binding;
  
  import java.lang.reflect.Constructor;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.lang.reflect.Modifier;
  
  import org.jadira.bindings.core.api.Binding;
  import org.jadira.bindings.core.api.BindingException;
  import org.jadira.bindings.core.general.marshaller.MethodToMarshaller;
  
  /**
   * Binding that supports a to contract, and a constructor parameterised by a S
   * @param <S> Source type for the conversion
   * @param <T> Target type
   */
  public final class MethodConstructorBinding<S, T> extends MethodToMarshaller<S, T> implements Binding<S, T> {
  
      private final Constructor<S> unmarshal;
  
      /**
       * Constructs a binding that supports a marshal method and an unmarshalling constructor
       * @param unmarshal The Constructor
       * @param targetClass The target class for marshalling to
       * @param marshal The marshalling method
       */
      public MethodConstructorBinding(Constructor<S> unmarshal, Class<T> targetClass, Method marshal) {
          
          super(unmarshal.getDeclaringClass(), targetClass, marshal);
          
          if (getBoundClass().isInterface() 
                  || Modifier.isAbstract(getBoundClass().getModifiers()) 
                  || getBoundClass().isLocalClass() 
                  || getBoundClass().isMemberClass()) {
              throw new IllegalStateException("unmarshal constructor must have an instantiable target class");
          }
          
          this.unmarshal = unmarshal;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public S unmarshal(T str) {
          try {
              return unmarshal.newInstance(str);
          } catch (IllegalAccessException ex) {
              throw new IllegalStateException("Constructor is not accessible");
          } catch (InstantiationException ex) {
              throw new IllegalStateException("Constructor is not valid");
          } catch (InvocationTargetException ex) {
              if (ex.getCause() instanceof RuntimeException) {
                  throw (RuntimeException) ex.getCause();
              }
              throw new BindingException(ex.getMessage(), ex.getCause());
          }
      }
  }