/*
    * 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 org.grouplens.grapht.util.Types;
  
  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;
  
  /**
   * SetterInjectionPoint represents an injection point via a setter method.
   *
   * @author <a href="http://grouplens.org">GroupLens Research</a>
   */
  public class SetterInjectionPoint implements InjectionPoint, Serializable {
      private static final long serialVersionUID = -1L;
      // transient because we use a serialization proxy
      private final transient Method setter;
      private final transient int parameter;
      private final transient AnnotationHelper annotations;
  
      /**
       * Create a SetterInjectionPoint that wraps the given setter method.
       *
       * @param setter The setter method
       * @param parameter The parameter index to apply
       */
      public SetterInjectionPoint(@Nonnull Method setter, int parameter) {
          Preconditions.notNull("setter method", setter);
          Preconditions.inRange(parameter, 0, setter.getParameterTypes().length);
  
          this.annotations = new AnnotationHelper(setter.getParameterAnnotations()[parameter]);
          this.setter = setter;
          this.parameter = parameter;
      }
  
      /**
       * @return The setter method wrapped by this injection point
       */
      @Override @Nonnull
      public Method getMember() {
          return setter;
      }
  
      /**
       * @return The parameter index of this injection point within the
       *         setter's parameters
       */
      public int getParameterIndex() {
          return parameter;
      }
  
      @Override
      public boolean isNullable() {
          // we'll check both setter and parameter annotations
          return Types.hasNullableAnnotation(setter.getAnnotations()) ||
                 Types.hasNullableAnnotation(setter.getParameterAnnotations()[parameter]);
      }
  
      @Override
      public Type getType() {
          return Types.box(setter.getGenericParameterTypes()[parameter]);
      }
  
      @Override
      public Class<?> getErasedType() {
          return Types.box(setter.getParameterTypes()[parameter]);
      }
  
      @Nullable
      @Override
     public Annotation getQualifier() {
         return annotations.getQualifier();
     }
 
     @Nullable
     @Override
     public <A extends Annotation> A getAttribute(Class<A> atype) {
         return annotations.getAttribute(atype);
     }
 
     @Nonnull
     @Override
     public Collection<Annotation> getAttributes() {
         return annotations.getAttributes();
     }
 
     @Override
     public boolean equals(Object o) {
         if (!(o instanceof SetterInjectionPoint)) {
             return false;
         }
         SetterInjectionPoint p = (SetterInjectionPoint) o;
         return p.setter.equals(setter) && p.parameter == parameter;
     }
 
     @Override
     public int hashCode() {
         return setter.hashCode() ^ (37 * 17 * parameter);
     }
 
     @Override
     public String toString() {
         // method setFoo(..., @Qual Type argN, ...)
         StringBuilder sb = new StringBuilder();
         sb.append("method ")
           .append(setter.getName())
           .append("(");
         if (parameter > 0) {
             sb.append("..., ");
         }
         if (annotations.getQualifier() != null) {
             sb.append(annotations.getQualifier())
               .append(" ");
         }
         sb.append(setter.getParameterTypes()[parameter].getName())
           .append(" arg")
           .append(parameter);
         if (parameter < setter.getParameterTypes().length) {
             sb.append(", ...");
         }
         sb.append(")");
 
         return sb.toString();
     }
 
     private Object writeReplace() {
         return new SerialProxy(setter, parameter);
     }
 
     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;
         private final int parameterIndex;
         public SerialProxy(Method m, int pidx) {
             method = MethodProxy.of(m);
             parameterIndex = pidx;
         }
 
         private Object readResolve() throws ObjectStreamException {
             try {
                 return new SetterInjectionPoint(method.resolve(), parameterIndex);
             } 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;
             }
         }
     }
 }