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package com.datastax.data.exploration.biz.datatable.column;

import com.datastax.data.exploration.biz.datatable.DataType;

import java.text.SimpleDateFormat;
import java.util.Comparator;
import java.util.Date;

/**
 * 日期属性列属性列
 * 格式：yyyy-MM-dd
 */
public class DateColumn extends TimestampColumn {

    public static SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");

    public DateColumn(String columnName) {
        super(columnName, DataType.DATE);
    }

    @Override
    Date transferValue(String str) {
        try {
            return format.parse(str);
        } catch (Exception e) {
            addError(ERROR_TYPE, str);
            return null;
        }
    }

    @Override
    void flush() {
        //
    }

    public Date max() {
        return getNotNullValues().stream().max(Comparator.comparingLong(Date::getTime)).orElse(null);
    }

    public Date min() {
        return getNotNullValues().stream().min(Comparator.comparingLong(Date::getTime)).orElse(null);
    }

}