/*
    * Grapht, an open source dependency injector.
    * Copyright 2014-2015 various contributors (see CONTRIBUTORS.txt)
    * Copyright 2010-2014 Regents of the University of Minnesota
    *
    * This program is free software; you can redistribute it and/or modify
    * it under the terms of the GNU Lesser General Public License as
    * published by the Free Software Foundation; either version 2.1 of the
    * License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
   * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
   * details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, write to the Free Software Foundation, Inc., 51
   * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
   */
  package org.grouplens.grapht.reflect.internal;
  
  import org.grouplens.grapht.reflect.InjectionPoint;
  import org.grouplens.grapht.util.MethodProxy;
  import org.grouplens.grapht.util.Preconditions;
  
  import javax.annotation.Nonnull;
  import javax.annotation.Nullable;
  import java.io.InvalidObjectException;
  import java.io.ObjectInputStream;
  import java.io.ObjectStreamException;
  import java.io.Serializable;
  import java.lang.annotation.Annotation;
  import java.lang.reflect.Method;
  import java.lang.reflect.Type;
  import java.util.Collection;
  import java.util.Collections;
  
  public class NoArgumentInjectionPoint implements InjectionPoint, Serializable {
      private static final long serialVersionUID = -1L;
      private final transient Method method;
  
      /**
       * Create a NoArgumentInjectionPoint that wraps the given no-argument
       * method.
       *
       * @param method The method to invoke without arguments
       */
      public NoArgumentInjectionPoint(@Nonnull Method method) {
          Preconditions.notNull("method", method);
          if (method.getParameterTypes().length != 0) {
              throw new IllegalArgumentException("Method takes arguments: " + method);
          }
  
          this.method = method;
      }
  
      /**
       * @return The setter method wrapped by this injection point
       */
      @Override @Nonnull
      public Method getMember() {
          return method;
      }
  
      @Override
      public boolean isNullable() {
          return true;
      }
  
      @Override
      public Type getType() {
          return Void.class;
      }
  
      @Override
      public Class<?> getErasedType() {
          return Void.class;
      }
  
      @Nullable
      @Override
      public Annotation getQualifier() {
          return null;
      }
  
      @Nullable
      @Override
      public <A extends Annotation> A getAttribute(Class<A> atype) {
          return null;
      }
  
      @Override
      public Collection<Annotation> getAttributes() {
          return Collections.emptyList();
      }
  
      @Override
      public boolean equals(Object o) {
          if (!(o instanceof NoArgumentInjectionPoint)) {
             return false;
         }
         NoArgumentInjectionPoint p = (NoArgumentInjectionPoint) o;
         return p.method.equals(method) && p.method == method;
     }
 
     @Override
     public int hashCode() {
         return method.hashCode();
     }
 
     @Override
     public String toString() {
         return method.toString();
     }
 
     private Object writeReplace() {
         return new SerialProxy(method);
     }
 
     private void readObject(ObjectInputStream stream) throws ObjectStreamException {
         throw new InvalidObjectException("Serialization proxy required");
     }
 
     private static class SerialProxy implements Serializable {
         private static final long serialVersionUID = 1L;
         private final MethodProxy method;
         public SerialProxy(Method m) {
             method = MethodProxy.of(m);
         }
 
         private Object readResolve() throws ObjectStreamException {
             try {
                 return new NoArgumentInjectionPoint(method.resolve());
             } catch (ClassNotFoundException e) {
                 InvalidObjectException ex =
                         new InvalidObjectException("no class for " + method.toString());
                 ex.initCause(e);
                 throw ex;
             } catch (NoSuchMethodException e) {
                 InvalidObjectException ex =
                         new InvalidObjectException("cannot resolve " + method.toString());
                 ex.initCause(e);
                 throw ex;
             }
         }
     }
 }