/*
    * 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.text.Format;
  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.bean.CsvColumnNameMappingBeanOperation;
  import com.orangesignal.csv.bean.CsvColumnNameMappingBeanTemplate;
  import com.orangesignal.csv.filters.CsvNamedValueFilter;
  import com.orangesignal.csv.io.CsvColumnNameMappingBeanReader;
  import com.orangesignal.csv.io.CsvColumnNameMappingBeanWriter;
  
  /**
   * 区切り文字形式データの項目名を基準として Java プログラム要素のリストと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
   * @see com.orangesignal.csv.manager.CsvColumnNameMappingBeanManager
   */
  public class ColumnNameMappingBeanListHandler<T> extends AbstractBeanListHandler<T, CsvColumnNameMappingBeanTemplate<T>, ColumnNameMappingBeanListHandler<T>> implements CsvColumnNameMappingBeanOperation<ColumnNameMappingBeanListHandler<T>> {
  
  	/**
  	 * 区切り文字形式データの列見出し (ヘッダ) 行を出力するかどうかを保持します。
  	 * 
  	 * @since 2.1
  	 */
  	private boolean header = true;
  
  	// ------------------------------------------------------------------------
  
  	/**
  	 * コンストラクタです。
  	 * 
  	 * @param type Java プログラム要素の型
  	 * @throws IllegalArgumentException {@code type} が {@code null} の場合
  	 */
  	public ColumnNameMappingBeanListHandler(final Class<T> type) {
  		super(CsvColumnNameMappingBeanTemplate.newInstance(type));
  	}
  
  	// ------------------------------------------------------------------------
  
  	@Override
  	public ColumnNameMappingBeanListHandler<T> column(final String column, final String field) {
  		return column(column, field, null);
  	}
  
  	@Override
  	public ColumnNameMappingBeanListHandler<T> column(final String column, final String field, final Format format) {
  		template.column(column, field, format);
  		return this;
  	}
  
  	@Override
  	public void setColumnMapping(final Map<String, String> columnMapping) {
  		template.setColumnMapping(columnMapping);
  	}
  
  	@Override
  	public ColumnNameMappingBeanListHandler<T> columnMapping(final Map<String, String> columnMapping) {
  		setColumnMapping(columnMapping);
  		return this;
  	}
  
  	@Override
  	public ColumnNameMappingBeanListHandler<T> filter(final CsvNamedValueFilter filter) {
  		template.filter(filter);
  		return this;
  	}
  
  	/**
  	 * 区切り文字形式データの列見出し (ヘッダ) 行を出力するかどうかを設定します。
  	 * 
  	 * @param header 区切り文字形式データの列見出し (ヘッダ) 行を出力するかどうか
  	 * @return このオブジェクトへの参照
  	 * @since 2.1
  	 */
  	public ColumnNameMappingBeanListHandler<T> header(final boolean header) {
  		this.header = header;
  		return this;
 	}
 
 	// ------------------------------------------------------------------------
 
 	@Override
 	public List<T> load(final CsvReader reader, final boolean ignoreScalar) throws IOException {
 		@SuppressWarnings("resource")
 		final CsvColumnNameMappingBeanReader<T> r = new CsvColumnNameMappingBeanReader<T>(reader, template);
 
 		// データ部を処理します。
 		final List<T> results = new ArrayList<T>();
 		final boolean order = ignoreScalar || orders != null && !orders.isEmpty();
 		int offset = 0;
 
 		List<String> values;
 		while ((values = r.readValues()) != null && (order || limit <= 0 || results.size() < limit)) {
 			if (beanFilter == null && !order && offset < this.offset) {
 				offset++;
 				continue;
 			}
 			final T bean = r.toBean(values);
 			if (beanFilter != null) {
 				if (!beanFilter.accept(bean)) {
 					continue;
 				}
 				if (!order && offset < this.offset) {
 					offset++;
 					continue;
 				}
 			}
 			results.add(bean);
 		}
 
 		if (ignoreScalar || !order) {
 			return results;
 		}
 		return processScalar(results);
 	}
 
 	@Override
 	public void save(final List<T> list, final CsvWriter writer) throws IOException {
 		@SuppressWarnings("resource")
 		final CsvColumnNameMappingBeanWriter<T> w = new CsvColumnNameMappingBeanWriter<T>(writer, template, header);
 
 		// データ部を処理します。
 		for (final T bean : list) {
 			// 要素が null の場合は null 出力します。
 			if (bean == null) {
 				w.write(null);
 				continue;
 			} else if (beanFilter != null && !beanFilter.accept(bean)) {
 				continue;
 			}
 
 			w.write(bean);
 		}
 	}
 
 }