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.
   */
  /**
   * (created at 2011-7-19)
   */
  package com.alibaba.cobar.route.function;
  
  import java.util.List;
  import java.util.Map;
  
  import com.alibaba.cobar.parser.ast.expression.Expression;
  import com.alibaba.cobar.parser.ast.expression.primary.function.FunctionExpression;
  import com.alibaba.cobar.route.util.PartitionUtil;
  import com.alibaba.cobar.util.SplitUtil;
  
  /**
   * @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
   */
  public abstract class PartitionFunction extends FunctionExpression {
      public PartitionFunction(String functionName, List<Expression> arguments) {
          super(functionName, arguments);
      }
  
      protected int[] count;
      protected int[] length;
      protected PartitionUtil partitionUtil;
  
      public void setPartitionCount(String partitionCount) {
          this.count = toIntArray(partitionCount);
      }
  
      public void setPartitionLength(String partitionLength) {
          this.length = toIntArray(partitionLength);
      }
  
      private static int[] toIntArray(String string) {
          String[] strs = SplitUtil.split(string, ',', true);
          int[] ints = new int[strs.length];
          for (int i = 0; i < strs.length; ++i) {
              ints[i] = Integer.parseInt(strs[i]);
          }
          return ints;
      }
  
      @Override
      public void init() {
          partitionUtil = new PartitionUtil(count, length);
      }
  
      protected int partitionIndex(long hash) {
          return partitionUtil.partition(hash);
      }
  
      @Override
      public abstract Object evaluationInternal(Map<? extends Object, ? extends Object> parameters);
  
  }
  