com.anrisoftware.globalpom.csvimport.CsvImporter Maven / Gradle / Ivy

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Arbitrary data for mathematical calculations.
There is a newer version: 4.7.0
/*
 * Copyright 2016 Erwin Müller 
 *
 * 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.anrisoftware.globalpom.csvimport;

import java.text.ParseException;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Callable;

import com.anrisoftware.globalpom.dataimport.Column;

/**
 * Reads CSV formatted data.
 *
 * @author Erwin Mueller, [email protected]
 * @since 1.9
 */
public interface CsvImporter extends Callable {

    /**
     * Reads the next row of the CSV formatted data.
     */
    @Override
    CsvImporter call() throws CsvImportException;

    /**
     * Returns the import properties.
     *
     * @return the {@link CsvImportProperties}.
     */
    CsvImportProperties getProperties();

    /**
     * Returns the names of the header if the CSV file contains a header row.
     *
     * @return the {@link List} of the header {@link String} names or
     *         {@code null} if the CSV file have no header row.
     *
     * @see CsvImportProperties#isHaveHeader()
     *
     * @since 2.5
     */
    List getHeaders();

    /**
     * Returns the values of the read row.
     *
     * @return the values {@link List} of the read row or {@code null} if the
     *         end of file was reached.
     */
    List getValues();

    /**
     * Returns the values of the read row with the column name as the map key
     * and the column value as the map value.
     *
     * @param columns
     *            the {@link List} of {@link Column} columns.
     *
     * @return the column names and values {@link Map} of the read row or
     *         {@code null} if the end of file was reached.
     *
     * @throws ParseException
     *             if the columns could not be parsed.
     */
    Map mapValues(List columns) throws ParseException;

    /**
     * Returns the values of the read row with the column name as the map key
     * and the column value as the map value.
     *
     * @param columns
     *            the {@link Map} of {@link Column} columns, identified by the
     *            column name.
     *
     * @param columnNames
     *            the {@link List} of column {@link String} names to map the
     *            column.
     *
     * @return the column names and values {@link Map} of the read row or
     *         {@code null} if the end of file was reached.
     *
     * @throws ParseException
     *             if the columns could not be parsed.
     *
     * @since 2.5
     */
    Map mapValues(Map columns,
            List columnNames) throws ParseException;

}