com.opencsv.bean.customconverter.ConvertGermanToBoolean Maven / Gradle / Ivy

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A simple library for reading and writing CSV in Java
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/*
 * Copyright 2016 Andrew Rucker Jones.
 *
 * 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.opencsv.bean.customconverter;

import com.opencsv.bean.AbstractBeanField;
import com.opencsv.exceptions.CsvDataTypeMismatchException;
import java.util.ResourceBundle;
import org.apache.commons.beanutils.ConversionException;
import org.apache.commons.beanutils.Converter;
import org.apache.commons.beanutils.converters.BooleanConverter;
import org.apache.commons.lang3.StringUtils;

/**
 * This class converts common German representations of boolean values into a
 * Boolean.
 * This class also demonstrates how to localize booleans for any other language.
 *
 * @param  Type of the bean to be manipulated
 * 
 * @author Andrew Rucker Jones
 * @since 3.8
 */
public class ConvertGermanToBoolean extends AbstractBeanField {
    
    protected static final String WAHR = "wahr";
    protected static final String FALSCH = "falsch";

    /**
     * Silence code style checker by adding a useless constructor.
     */
    public ConvertGermanToBoolean() {
    }

    /**
     * Converts German text into a Boolean.
     * The comparisons are case-insensitive. The recognized pairs are
     * wahr/falsch, w/f, ja/nein, j/n, 1/0.
     *
     * @param value String that should represent a Boolean
     * @return Boolean
     * @throws CsvDataTypeMismatchException   If anything other than the
     *                                        explicitly translated pairs is found
     */
    @Override
    protected Object convert(String value)
            throws CsvDataTypeMismatchException {
        if (StringUtils.isEmpty(value)) {
            return null;
        }
        String[] trueStrings = {WAHR, "ja", "j", "1", "w"};
        String[] falseStrings = {FALSCH, "nein", "n", "0", "f"};
        Converter bc = new BooleanConverter(trueStrings, falseStrings);
        try {
            return bc.convert(Boolean.class, value.trim());
        } catch (ConversionException e) {
            CsvDataTypeMismatchException csve = new CsvDataTypeMismatchException(
                    value, field.getType(), ResourceBundle
                            .getBundle("convertGermanToBoolean", errorLocale)
                            .getString("input.not.boolean"));
            csve.initCause(e);
            throw csve;
        }
    }
    
    /**
     * This method takes the current value of the field in question in the bean
     * passed in and converts it to a string.
     * This implementation returns true/false values in German.
     * 
     * @return "wahr" if true, "falsch" if false
     * @throws CsvDataTypeMismatchException If the field is not a {@code boolean}
     *   or {@link java.lang.Boolean}
     */
    @Override
    protected String convertToWrite(Object value)
            throws CsvDataTypeMismatchException {
        String result = "";
        try {
            if(value != null) {
                Boolean b = (Boolean) value;
                result = b?WAHR:FALSCH;
            }
        }
        catch(ClassCastException e) {
            CsvDataTypeMismatchException csve =
                    new CsvDataTypeMismatchException(ResourceBundle
                            .getBundle("convertGermanToBoolean", errorLocale)
                            .getString("field.not.boolean"));
            csve.initCause(e);
            throw csve;
        }
        return result;
    }

}