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.inject.util.ArrayLoader;
  import org.osgl.util.E;
  import org.osgl.util.Keyword;
  import org.osgl.util.S;
  import org.osgl.util.StringValueResolver;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  
  class HeaderValueLoader extends ParamValueLoader.NonCacheable {
  
      private final String key;
      private final boolean multiValues;
      private final boolean isArray;
      private final Class elementType;
      private final Class targetType;
      private final StringValueResolver stringValueResolver;
      private final Object defVal;
  
      public HeaderValueLoader(String name, BeanSpec beanSpec) {
          this.key = key(name, beanSpec);
          this.targetType = beanSpec.rawType();
          this.isArray = targetType.isArray();
          this.multiValues = (isArray || Collection.class.isAssignableFrom(targetType));
          if (this.isArray) {
              this.elementType = this.targetType.getComponentType();
          } else if (this.multiValues) {
              this.elementType = (Class)(beanSpec.typeParams().get(0));
          } else {
              this.elementType = null;
          }
          Class effectiveType = null != elementType ? elementType : targetType;
          this.stringValueResolver = App.instance().resolverManager().resolver(effectiveType, 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, effectiveType);
          }
      }
  
      @Override
      public String toString() {
          return S.concat("header 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) {
          if (multiValues) {
              Iterable<String> iterable = context.req().headers(key);
              List list = new ArrayList();
              if (null != iterable) {
                  for (String s : iterable) {
                      Object obj = stringValueResolver.resolve(s);
                      if (null != obj) {
                          list.add(obj);
                      }
                  }
              }
              if (isArray) {
                  return ArrayLoader.listToArray(list, elementType);
              } else {
                  Collection c = (Collection) App.instance().injector().get(targetType);
                  c.addAll(list);
                  return c;
              }
          } else {
              String value = context.req().header(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;
          }
          name = spec.name();
          return Keyword.of(name).httpHeader();
      }
  }
  