/*
    * Copyright 2013 the original author or authors.
    *
    * 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.orangesignal.csv.handlers;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  import com.orangesignal.csv.CsvReader;
  import com.orangesignal.csv.CsvWriter;
  import com.orangesignal.csv.filters.CsvValueFilter;
  import com.orangesignal.csv.io.CsvColumnPositionMapReader;
  import com.orangesignal.csv.io.CsvColumnPositionMapWriter;
  
  /**
   * 項目位置と項目値のマップのリストで区切り文字形式データアクセスを行うハンドラを提供します。
   *
   * @author Koji Sugisawa
   * @since 1.1
   */
  public class ColumnPositionMapListHandler extends AbstractCsvListHandler<Map<Integer, String>, ColumnPositionMapListHandler> {
  
  	/**
  	 * 区切り文字形式データフィルタを保持します。
  	 */
  	private CsvValueFilter valueFilter;
  
  	/**
  	 * デフォルトコンストラクタです。
  	 */
  	public ColumnPositionMapListHandler() {}
  
  	/**
  	 * 区切り文字形式データフィルタを設定します。
  	 * 
  	 * @param filter 区切り文字形式データフィルタ
  	 * @return このオブジェクトへの参照
  	 * @since 1.2.3
  	 */
  	public ColumnPositionMapListHandler filter(final CsvValueFilter filter) {
  		this.valueFilter = filter;
  		return this;
  	}
  
  	@Override
  	public List<Map<Integer, String>> load(final CsvReader reader, final boolean ignoreScalar) throws IOException {
  		@SuppressWarnings("resource")
  		final CsvColumnPositionMapReader r = new CsvColumnPositionMapReader(reader);
  		r.setFilter(valueFilter);
  
  		// データ部を処理します。
  		final List<Map<Integer, String>> results = new ArrayList<Map<Integer, String>>();
  		int offset = 0;
  
  		List<String> values;
  		while ((values = r.readValues()) != null && (ignoreScalar || limit <= 0 || results.size() < limit)) {
  			if (!ignoreScalar && offset < this.offset) {
  				offset++;
  				continue;
  			}
  			results.add(r.toMap(values));
  		}
  		return results;
  	}
  
  	@Override
  	public void save(final List<Map<Integer, String>> list, final CsvWriter writer) throws IOException {
  		@SuppressWarnings("resource")
  		final CsvColumnPositionMapWriter w = new CsvColumnPositionMapWriter(writer);
  		w.setFilter(valueFilter);
  
  		// データ部を処理します。
  		for (final Map<Integer, String> map : list) {
  			w.write(map);
  		}
  	}
  
  }