content: package act.util;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2018 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import act.app.App;
  import com.alibaba.fastjson.parser.ParserConfig;
  import com.alibaba.fastjson.parser.deserializer.ObjectDeserializer;
  import com.alibaba.fastjson.serializer.ObjectSerializer;
  import com.alibaba.fastjson.serializer.SerializeConfig;
  import org.osgl.Lang;
  
  import java.lang.annotation.ElementType;
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  import java.lang.annotation.Target;
  import javax.inject.Inject;
  import javax.inject.Singleton;
  
  /**
   * Namespace for FastJSON relevant annotations/utilities
   */
  public enum FastJson {
      ;
  
      /**
       * Used to annotate on user defined {@link com.alibaba.fastjson.serializer.ObjectSerializer}
       * or {@link com.alibaba.fastjson.parser.deserializer.ObjectDeserializer} to specify
       * the type and sub type to which it shall apply
       */
      @Retention(RetentionPolicy.RUNTIME)
      @Target(ElementType.TYPE)
      public @interface For {
          /**
           * Specify the classes of the type the annotated Serializer/Deserializer shall
           * apply to.
           *
           * @return the classes as described above
           */
          Class[] value();
      }
  
      /**
       * Used to annotate on a class that specified {@link com.alibaba.fastjson.serializer.ObjectSerializer}
       * shall be applied to.
       */
      @Retention(RetentionPolicy.RUNTIME)
      @Target(ElementType.TYPE)
      public @interface Serializer {
          /**
           * Specify the Serializer class the annotated type and it's sub type shall be applied
           *
           * @return the Serializer type
           */
          Class<? extends ObjectSerializer> value();
      }
  
      /**
       * Used to annotate on a class that specified {@link com.alibaba.fastjson.parser.deserializer.ObjectDeserializer}
       * shall be applied to.
       */
      @Retention(RetentionPolicy.RUNTIME)
      @Target(ElementType.TYPE)
      public @interface Deserializer {
          /**
           * Specify the Deserializer class the annotated type and it's sub type shall be applied
           *
           * @return the Deserializer type
           */
          Class<? extends ObjectDeserializer> value();
      }
  
      @Singleton
      public static class Explorer extends LogSupport {
  
          @Inject
          private App app;
  
          @Inject
          private ClassInfoRepository repo;
  
          @AnnotatedClassFinder(For.class)
          public void foundFor(Class<?> type) {
              For forAnno = type.getAnnotation(For.class);
              Class[] targetTypes = forAnno.value();
              if (0 == targetTypes.length) {
                  warn("@For annotation on [%s] must have target type specified", type.getName());
                  return;
              }
              if (ObjectSerializer.class.isAssignableFrom(type)) {
                  ObjectSerializer serializer = (ObjectSerializer) app.getInstance(type);
                  handleForSerializer(serializer, targetTypes);
              }
              if (ObjectDeserializer.class.isAssignableFrom(type)) {
                  ObjectDeserializer deserializer = (ObjectDeserializer) app.getInstance(type);
                  handleForDeserializer(deserializer, targetTypes);
              }
          }
  
          @AnnotatedClassFinder(Serializer.class)
          public void foundSerializer(Class<?> targetType) {
              Serializer serializerAnno = targetType.getAnnotation(Serializer.class);
              Class<? extends ObjectSerializer> serializerType = serializerAnno.value();
              ObjectSerializer serializer = app.getInstance(serializerType);
              handleForSerializer(serializer, targetType);
          }
  
          @AnnotatedClassFinder(Deserializer.class)
          public void foundDeserializer(Class<?> targetType) {
              Deserializer deserializerAnno = targetType.getAnnotation(Deserializer.class);
              Class<? extends ObjectDeserializer> deserializerType = deserializerAnno.value();
              ObjectDeserializer deserializer = app.getInstance(deserializerType);
              handleForDeserializer(deserializer, targetType);
          }
  
          private void handleForSerializer(ObjectSerializer serializer, Class[] targetTypes) {
              for (Class type : targetTypes) {
                  handleForSerializer(serializer, type);
              }
          }
  
          private void handleForSerializer(final ObjectSerializer serializer, Class targetType) {
              ClassNode node = repo.node(targetType.getName());
              if (null == node) {
                  warn("Unknown target type: " + targetType.getName());
                  return;
              }
              final SerializeConfig config = SerializeConfig.getGlobalInstance();
              node.visitSubTree(new Lang.Visitor<ClassNode>() {
                  @Override
                  public void visit(ClassNode classNode) throws Lang.Break {
                      Class type = app.classForName(classNode.name());
                      config.put(type, serializer);
                  }
              });
              config.put(targetType, serializer);
          }
  
          private void handleForDeserializer(ObjectDeserializer serializer, Class[] targetTypes) {
              for (Class type : targetTypes) {
                  handleForDeserializer(serializer, type);
              }
          }
  
          private void handleForDeserializer(final ObjectDeserializer deserializer, Class targetType) {
              ClassNode node = repo.node(targetType.getName());
              if (null == node) {
                  warn("Unknown target type: " + targetType.getName());
                  return;
              }
              final ParserConfig config = ParserConfig.getGlobalInstance();
              node.visitSubTree(new Lang.Visitor<ClassNode>() {
                  @Override
                  public void visit(ClassNode classNode) throws Lang.Break {
                      Class type = app.classForName(classNode.name());
                      config.putDeserializer(type, deserializer);
                  }
              });
              config.putDeserializer(targetType, deserializer);
          }
      }
  
  }
  