package org.apache.blur.jdbc.util;

/**
 * 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.
 */
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Types;
import java.util.List;
import java.util.Map;

import org.apache.blur.jdbc.abstractimpl.AbstractBlurResultSet;
import org.apache.blur.jdbc.abstractimpl.AbstractBlurResultSetMetaData;


public class SimpleStringResultSet extends AbstractBlurResultSet {

  private List<String> columnNames;
  private List<Map<String, String>> data;
  private int position = -1;
  private String lastValue;

  public SimpleStringResultSet(List<String> columnNames, List<Map<String, String>> data) {
    this.columnNames = columnNames;
    this.data = data;
  }

  @Override
  public ResultSetMetaData getMetaData() throws SQLException {
    return new SimpleStringResultSetMetaData(columnNames);
  }

  @Override
  public boolean next() throws SQLException {
    if (position + 1 >= data.size()) {
      return false;
    }
    position++;
    return true;
  }

  @Override
  public String getString(int columnIndex) throws SQLException {
    String name = columnNames.get(columnIndex - 1);
    Map<String, String> row = data.get(position);
    return lastValue = row.get(name);
  }

  @Override
  public boolean wasNull() throws SQLException {
    return lastValue == null ? true : false;
  }

  @Override
  public void close() throws SQLException {

  }

  public static class SimpleStringResultSetMetaData extends AbstractBlurResultSetMetaData {

    private List<String> columnNames;

    public SimpleStringResultSetMetaData(List<String> columnNames) {
      this.columnNames = columnNames;
    }

    @Override
    public int getColumnCount() throws SQLException {
      return columnNames.size();
    }

    @Override
    public String getColumnName(int column) throws SQLException {
      return columnNames.get(column - 1);
    }

    @Override
    public int getColumnType(int column) throws SQLException {
      return Types.VARCHAR;
    }

    @Override
    public String getColumnTypeName(int column) throws SQLException {
      return "string";
    }

  }
}