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.app.ActionContext;
  import act.app.App;
  import act.inject.DefaultValue;
  import act.util.ActContext;
  import org.osgl.inject.BeanSpec;
  import org.osgl.util.E;
  import org.osgl.util.S;
  import org.osgl.util.StringValueResolver;
  
  class SessionValueLoader extends ParamValueLoader.NonCacheable {
  
      private final String key;
      private final Class targetType;
      private final StringValueResolver stringValueResolver;
      private final Object defVal;
  
      public SessionValueLoader(String name, BeanSpec beanSpec) {
          this.key = key(name, beanSpec);
          this.targetType = beanSpec.rawType();
          this.stringValueResolver = App.instance().resolverManager().resolver(targetType, beanSpec);
          E.illegalArgumentIf(null == this.stringValueResolver, "Cannot find out StringValueResolver for %s", beanSpec);
          DefaultValue defValAnno = beanSpec.getAnnotation(DefaultValue.class);
          if (null != defValAnno) {
              this.defVal = stringValueResolver.resolve(defValAnno.value());
          } else {
              this.defVal = StringValueResolverValueLoaderBase.defVal(null, targetType);
          }
      }
  
      @Override
      public String toString() {
          return S.concat("session value loader[", bindName(), "]");
      }
  
      @Override
      public Object load(Object bean, ActContext<?> context, boolean noDefaultValue) {
          if (context instanceof ActionContext) {
              return load((ActionContext) context, noDefaultValue);
          }
          throw E.unsupport();
      }
  
      private Object load(ActionContext context, boolean noDefaultValue) {
          String value = context.session(key);
          Object obj = (null == value) ? null : stringValueResolver.resolve(value);
          return (null == obj) && !noDefaultValue ? defVal : obj;
      }
  
      @Override
      public String bindName() {
          return key;
      }
  
      private String key(String name, BeanSpec spec) {
          if (S.notBlank(name)) {
              return name;
          }
          return spec.name();
      }
  }
  