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.util;
  
  import org.apache.commons.lang.builder.EqualsBuilder;
  import org.apache.commons.lang.builder.HashCodeBuilder;
  
  /**
   * (created at 2010-8-4)
   * 
   * @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
   */
  public class Tuple {
      private final Object[] objects;
  
      public Tuple(Object... objects) {
          if (objects == null) throw new IllegalArgumentException("no argument!");
          this.objects = objects;
      }
  
      /**
       * @param index start from 0
       */
      public Object getElement(int index) {
          return objects[index];
      }
  
      @Override
      public int hashCode() {
          HashCodeBuilder builder = new HashCodeBuilder();
          for (Object obj : objects) {
              builder.append(obj);
          }
          return builder.toHashCode();
      }
  
      @Override
      public boolean equals(Object obj) {
          if (obj == this) return true;
          if (!(obj instanceof Tuple)) return false;
          Tuple that = (Tuple) obj;
          EqualsBuilder builder = new EqualsBuilder();
          builder.append(this.objects, that.objects);
          return builder.isEquals();
      }
  }
  