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/**
 * 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.
 */

/*
 * This source file is based on code taken from SQLLine 1.0.2
 * See SQLLine notice in LICENSE
 */
package org.apache.hive.beeline;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Iterator;
import java.util.LinkedList;

/**
 * Rows implementation which buffers all rows in a linked list.
 */
class BufferedRows extends Rows {
  private final LinkedList list;
  private final Iterator iterator;

  BufferedRows(BeeLine beeLine, ResultSet rs) throws SQLException {
    super(beeLine, rs);
    list = new LinkedList();
    int count = rsMeta.getColumnCount();
    list.add(new Row(count));
    while (rs.next()) {
      list.add(new Row(count, rs));
    }
    iterator = list.iterator();
  }

  public boolean hasNext() {
    return iterator.hasNext();
  }

  public Object next() {
    return iterator.next();
  }

  @Override
  public String toString(){
    return list.toString();
  }

  @Override
  void normalizeWidths() {
    int[] max = null;
    for (Row row : list) {
      if (max == null) {
        max = new int[row.values.length];
      }
      for (int j = 0; j < max.length; j++) {
        max[j] = Math.max(max[j], row.sizes[j] + 1);
      }
    }
    for (Row row : list) {
      row.sizes = max;
    }
  }

}