com.twosigma.beakerx.table.TableDisplayConverter.java Source code

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Here is the source code for com.twosigma.beakerx.table.TableDisplayConverter.java

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/*
 *  Copyright 2017 TWO SIGMA OPEN SOURCE, LLC
 *
 *  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.twosigma.beakerx.table;

import org.apache.commons.lang3.math.NumberUtils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;

public class TableDisplayConverter {

    public static List<Map<String, Object>> convert(int rowCount, int columnCount, List<String> columnNames,
            TableDisplay.Element tableElement) {
        List<Map<String, Object>> result = new ArrayList<>();
        for (int r = 0; r < rowCount; r++) {
            Map<String, Object> entry = new LinkedHashMap<>();
            for (int c = 0; c < columnCount; c++) {
                Object value = tableElement.get(c, r);
                String headerName = columnNames.get(c);
                if (headerName.equals("time")) {
                    entry.put(headerName, convertDate(value));
                } else {
                    entry.put(headerName, convertToNumber(value));
                }
            }
            result.add(entry);
        }
        return result;
    }

    private static Object convertToNumber(Object value) {
        if (value instanceof String && NumberUtils.isNumber((String) value)) {
            return Double.parseDouble((String) value);
        } else {
            return value;
        }
    }

    private static Object convertDate(Object x) {
        if (x instanceof Number) {
            return x;
        } else if (x instanceof Date) {
            Date date = (Date) x;
            return date;
        } else if (x instanceof String) {
            Date inputDate = null;
            try {
                inputDate = new SimpleDateFormat("yyyy-MM-dd").parse((String) x);
            } catch (ParseException e) {
                throw new IllegalArgumentException(
                        "time column accepts String date in a following format yyyy-MM-dd");
            }
            return inputDate;
        } else {
            throw new IllegalArgumentException(
                    "time column accepts numbers or java.util.Date objects or String date in a following format yyyy-MM-dd");
        }
    }
}