/*
    * 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.Arrays;
  import java.util.List;
  
  import com.orangesignal.csv.CsvReader;
  import com.orangesignal.csv.CsvWriter;
  import com.orangesignal.csv.filters.CsvValueFilter;
  
  /**
   * 文字列配列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
   */
  public class StringArrayListHandler extends AbstractCsvListHandler<String[], StringArrayListHandler> {
  
  	/**
  	 * 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 StringArrayListHandler() {
  	}
  
  	/**
  	 * 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 StringArrayListHandler filter(final CsvValueFilter filter) {
  		this.valueFilter = filter;
  		return this;
  	}
  
  	@Override
  	public List<String[]> load(final CsvReader reader, final boolean ignoreScalar) throws IOException {
  		final List<String[]> results = new ArrayList<String[]>();
  		int offset = 0;
  		List<String> values;
  		while ((values = reader.readValues()) != null && (ignoreScalar || limit <= 0 || results.size() < limit)) {
  			if (valueFilter != null && !valueFilter.accept(values)) {
  				continue;
  			}
  			if (!ignoreScalar && offset < this.offset) {
  				offset++;
  				continue;
  			}
  			results.add(values.toArray(new String[0]));
  		}
  		return results;
  	}
  
  	@Override
  	public void save(final List<String[]> list, final CsvWriter writer) throws IOException {
  		for (final String[] values : list) {
  			final List<String> _values = Arrays.asList(values);
  			if (valueFilter != null && !valueFilter.accept(_values)) {
  				continue;
  			}
  			writer.writeValues(_values);
  		}
  	}
  
  }