content: package act.data;
  
  /*-
   * #%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 org.osgl.mvc.util.Binder;
  import org.osgl.mvc.util.ParamValueProvider;
  import org.osgl.storage.ISObject;
  import org.osgl.util.IO;
  
  import static act.data.annotation.ReadContent.ATTR_MERCY;
  
  /**
   * Read content as string from resource URL
   */
  public class ContentStringBinder extends Binder<String> {
  
      public static final ContentStringBinder INSTANCE = new ContentStringBinder();
  
      @Override
      public String resolve(String bean, String model, ParamValueProvider params) {
          try {
              ISObject sobj = SObjectBinder.INSTANCE.resolve(null, model, params);
              return null == sobj ? fallBack(model, params) : IO.readContentAsString(sobj.asInputStream());
          } catch (Exception e) {
              return fallBack(model, params);
          }
      }
  
      private String fallBack(String model, ParamValueProvider params) {
          Boolean mercy = attribute(ATTR_MERCY);
          if (null == mercy) {
              mercy = false;
          }
          return mercy ? params.paramVal(model) : null;
      }
  
  
  }
  