content: /*
   * Copyright 1999-2012 Alibaba Group.
   *  
   * 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.
   */
  
  package com.alibaba.cobar.manager.web.ajax;
  
  import javax.servlet.http.HttpServletRequest;
  
  import org.apache.commons.lang.builder.ToStringBuilder;
  
  /**
   * (created at 2010-9-15)
   * 
   * @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
   * @author wenfeng.cenwf 2011-3-28
   * @author haiqing.zhuhq 2011-9-1
   */
  public abstract class AbstractAjaxParams {
  
      public AbstractAjaxParams(HttpServletRequest request) {
          super();
      }
  
      @Override
      public String toString() {
          ToStringBuilder builder = new ToStringBuilder(this);
          appendToStringBuilder(builder);
          return builder.toString();
      }
  
      protected abstract void appendToStringBuilder(ToStringBuilder builder);
  
      protected Integer getInt(HttpServletRequest request, String name, boolean required) {
          try {
              return Integer.parseInt(request.getParameter(name));
          } catch (Exception e) {
              if (required) throw new IllegalArgumentException("parameter '" + name + "' is invalid!");
              else return null;
          }
      }
  
      protected long getLong(HttpServletRequest request, String name, boolean required) {
          try {
              return Long.parseLong(request.getParameter(name));
          } catch (Exception e) {
              if (required) throw new IllegalArgumentException("parameter '" + name + "' is invalid!");
              else return -1;
          }
      }
  
      protected Long getLongObj(HttpServletRequest request, String name, boolean required) {
          try {
              return Long.parseLong(request.getParameter(name));
          } catch (Exception e) {
              if (required) throw new IllegalArgumentException("parameter '" + name + "' is invalid!");
              else return null;
          }
      }
  
      protected String getString(HttpServletRequest request, String name, boolean required) {
  
          String rst = request.getParameter(name);
          if (rst == null && required) throw new NullPointerException("parameter '" + name + "' is null!");
          return rst;
      }
  
  }
  