content: /*
   * 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 com.aliyun.odps.mapred.bridge;
  
  import java.util.Arrays;
  import java.util.Iterator;
  import java.util.List;
  import java.util.NoSuchElementException;
  import com.aliyun.odps.data.Record;
  
  /**
   * @author zhe.oyz
   */
  public class NonGroupingRecordIterator implements Iterator<Record> {
  
    private WritableRecord value;
    private Object[] prefetch; // Prefetched Objects
    private int curIndex = 0;
    private List<Object[]> valueList;
  
    public NonGroupingRecordIterator(List<Object[]> curValuelist, WritableRecord value) {
      this.valueList = curValuelist;
      this.value = value;
    }
  
    private void fillKeyValue(Object[] objs) {
      value.set(Arrays.copyOf(objs, value.getColumnCount()));
    }
  
    @Override
    public boolean hasNext() {
      if (curIndex < valueList.size()) {
        return true;
      } else {
        return false;
      }
    }
  
    public boolean reset() {
      if (prefetch != null) {
        fillKeyValue(prefetch);
        return true;
      }
      return false;
    }
  
    @Override
    public Record next() {
      if (!hasNext()) {
        throw new NoSuchElementException();
      }
      fillKeyValue(valueList.get(curIndex));
      curIndex++;
      prefetch = null;
      return value;
    }
  
    @Override
    public void remove() {
      if (!hasNext()) {
        throw new NoSuchElementException();
      }
      prefetch = null;
    }
  
  }
  