content: package act.inject.param;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 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.Act;
  import act.app.ActionContext;
  import act.app.App;
  import act.app.data.StringValueResolverManager;
  import act.inject.DependencyInjector;
  import act.util.ActContext;
  import com.alibaba.fastjson.JSON;
  import com.alibaba.fastjson.JSONObject;
  import org.osgl.$;
  import org.osgl.inject.BeanSpec;
  import org.osgl.util.S;
  
  import java.lang.reflect.Array;
  import java.util.Collection;
  import java.util.Map;
  import javax.inject.Provider;
  
  class JsonParamValueLoader implements ParamValueLoader {
  
      private static final Provider NULL_PROVIDER = new Provider() {
          @Override
          public Object get() {
              return null;
          }
      };
  
      private ParamValueLoader fallBack;
      private BeanSpec spec;
      private Provider defValProvider;
      private boolean notController;
  
      JsonParamValueLoader(ParamValueLoader fallBack, BeanSpec spec, DependencyInjector<?> injector) {
          this.fallBack = $.requireNotNull(fallBack);
          this.spec = $.requireNotNull(spec);
          this.defValProvider = findDefValProvider(spec, injector);
          this.notController = null == Act.app().classLoader().controllerClassMetaInfo(spec.rawType().getName());
      }
  
      private JsonParamValueLoader(JsonParamValueLoader parent, Class runtimeType) {
          this.fallBack = parent.fallBack.wrapWithRuntimeType(runtimeType);
          this.spec = parent.spec;
          this.defValProvider = parent.defValProvider;
      }
  
      @Override
      public String toString() {
          return S.concat("json param|", fallBack);
      }
  
      @Override
      public Object load(Object bean, ActContext<?> context, boolean noDefaultValue) {
          if (context instanceof ActionContext && ((ActionContext)context).isPathVar(spec.name())) {
              return fallBack.load(bean, context, noDefaultValue);
          }
          JsonDto dto = notController ? (JsonDto) context.attribute(JsonDto.CTX_ATTR_KEY) : null;
          if (null == dto) {
              return this.fallBack.load(bean, context, noDefaultValue);
          } else {
              String key = spec.name();
              Object o = dto.get(key);
              if (null != o) {
                  return o;
              }
              if (context instanceof ActionContext) {
                  if (key.contains(".")) {
                      String body = ((ActionContext) context).patchedJsonBody();
                      JSONObject json = JSON.parseObject(body);
                      o = $.getProperty(json, key);
                  }
              }
              return null != o ? o : defValProvider.get();
          }
      }
  
      @Override
      public String bindName() {
          return spec.name();
      }
  
      @Override
      public boolean supportScopeCaching() {
          return fallBack.supportScopeCaching();
      }
  
      @Override
      public boolean supportJsonDecorator() {
          return false;
      }
  
      private static Provider findDefValProvider(BeanSpec beanSpec, DependencyInjector<?> injector) {
          final Class c = beanSpec.rawType();
          final StringValueResolverManager resolver = App.instance().resolverManager();
          if (c.isPrimitive()) {
              return new Provider() {
                  @Override
                  public Object get() {
                      return resolver.resolve(null, c);
                  }
              };
          } else if (Collection.class.isAssignableFrom(c) || Map.class.isAssignableFrom(c)) {
              return injector.getProvider(c);
          } else if (c.isArray()) {
              return new Provider() {
                  @Override
                  public Object get() {
                      return Array.newInstance(c.getComponentType(), 0);
                  }
              };
          } else {
              return NULL_PROVIDER;
          }
      }
  
      @Override
      public boolean requireRuntimeTypeInfo() {
          return fallBack.requireRuntimeTypeInfo();
      }
  
      @Override
      public ParamValueLoader wrapWithRuntimeType(Class<?> type) {
          return new JsonParamValueLoader(this, type);
      }
  }
  