/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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.
   */
  
  package org.apache.commons.jxpath.servlet;
  
  import java.util.Enumeration;
  import java.util.HashSet;
  
  import javax.servlet.ServletRequest;
  
  /**
   * Implementation of the {@link org.apache.commons.jxpath.DynamicPropertyHandler} interface that provides access to attributes and parameters of a
   * {@link ServletRequest}.
   */
  public class ServletRequestHandler extends HttpSessionHandler {
  
      /**
       * Constructs a new instance.
       */
      public ServletRequestHandler() {
          // empty
      }
  
      @Override
      protected void collectPropertyNames(final HashSet<String> set, final Object bean) {
          super.collectPropertyNames(set, bean);
          final ServletRequestAndContext handle = (ServletRequestAndContext) bean;
          final ServletRequest servletRequest = handle.getServletRequest();
          Enumeration<String> e = servletRequest.getAttributeNames();
          while (e.hasMoreElements()) {
              set.add(e.nextElement());
          }
          e = servletRequest.getParameterNames();
          while (e.hasMoreElements()) {
              set.add(e.nextElement());
          }
      }
  
      @Override
      public Object getProperty(final Object bean, final String property) {
          final ServletRequestAndContext handle = (ServletRequestAndContext) bean;
          final ServletRequest servletRequest = handle.getServletRequest();
          final String[] strings = servletRequest.getParameterValues(property);
          if (strings != null) {
              if (strings.length == 0) {
                  return null;
              }
              if (strings.length == 1) {
                  return strings[0];
              }
              return strings;
          }
          final Object object = servletRequest.getAttribute(property);
          if (object != null) {
              return object;
          }
          return super.getProperty(bean, property);
      }
  
      @Override
      public void setProperty(final Object request, final String property, final Object value) {
          ((ServletRequestAndContext) request).getServletRequest().setAttribute(property, value);
      }
  }