Commons Beanutils example source code file (StringLocaleConverter.java)

This example Commons Beanutils source code file (StringLocaleConverter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons Beanutils tags/keywords

baselocaleconverter, date, decimalformat, decimalformat, float, locale, locale, math, no, object, simpledateformat, string, string, stringlocaleconverter, stringlocaleconverter, text, util

The Commons Beanutils StringLocaleConverter.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.commons.beanutils.locale.converters;

import org.apache.commons.beanutils.locale.BaseLocaleConverter;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;


/**
 * <p>Standard {@link org.apache.commons.beanutils.locale.LocaleConverter}
 * implementation that converts an incoming
 * locale-sensitive object into a <code>java.lang.String object,
 * optionally using a default value or throwing a
 * {@link org.apache.commons.beanutils.ConversionException}
 * if a conversion error occurs.</p>
 *
 * @author Yauheny Mikulski
 */

public class StringLocaleConverter extends BaseLocaleConverter {

    // ----------------------------------------------------- Instance Variables

    /** All logging goes through this logger */
    private Log log = LogFactory.getLog(StringLocaleConverter.class);     //msz fix


    // ----------------------------------------------------------- Constructors

    /**
     * Create a {@link org.apache.commons.beanutils.locale.LocaleConverter}
     * that will throw a {@link org.apache.commons.beanutils.ConversionException}
     * if a conversion error occurs. The locale is the default locale for
     * this instance of the Java Virtual Machine and an unlocalized pattern is used
     * for the convertion.
     *
     */
    public StringLocaleConverter() {

        this(false);
    }

    /**
     * Create a {@link org.apache.commons.beanutils.locale.LocaleConverter}
     * that will throw a {@link org.apache.commons.beanutils.ConversionException}
     * if a conversion error occurs. The locale is the default locale for
     * this instance of the Java Virtual Machine.
     *
     * @param locPattern    Indicate whether the pattern is localized or not
     */
    public StringLocaleConverter(boolean locPattern) {

        this(Locale.getDefault(), locPattern);
    }

    /**
     * Create a {@link org.apache.commons.beanutils.locale.LocaleConverter}
     * that will throw a {@link org.apache.commons.beanutils.ConversionException}
     * if a conversion error occurs. An unlocalized pattern is used for the convertion.
     *
     * @param locale        The locale
     */
    public StringLocaleConverter(Locale locale) {

        this(locale, false);
    }

    /**
     * Create a {@link org.apache.commons.beanutils.locale.LocaleConverter}
     * that will throw a {@link org.apache.commons.beanutils.ConversionException}
     * if a conversion error occurs.
     *
     * @param locale        The locale
     * @param locPattern    Indicate whether the pattern is localized or not
     */
    public StringLocaleConverter(Locale locale, boolean locPattern) {

        this(locale, (String) null, locPattern);
    }

    /**
     * Create a {@link org.apache.commons.beanutils.locale.LocaleConverter}
     * that will throw a {@link org.apache.commons.beanutils.ConversionException}
     * if a conversion error occurs. An unlocalized pattern is used for the convertion.
     *
     * @param locale        The locale
     * @param pattern       The convertion pattern
     */
    public StringLocaleConverter(Locale locale, String pattern) {

        this(locale, pattern, false);
    }

    /**
     * Create a {@link org.apache.commons.beanutils.locale.LocaleConverter}
     * that will throw a {@link org.apache.commons.beanutils.ConversionException}
     * if a conversion error occurs.
     *
     * @param locale        The locale
     * @param pattern       The convertion pattern
     * @param locPattern    Indicate whether the pattern is localized or not
     */
    public StringLocaleConverter(Locale locale, String pattern, boolean locPattern) {

        super(locale, pattern, locPattern);
    }

    /**
     * Create a {@link org.apache.commons.beanutils.locale.LocaleConverter}
     * that will return the specified default value
     * if a conversion error occurs. The locale is the default locale for
     * this instance of the Java Virtual Machine and an unlocalized pattern is used
     * for the convertion.
     *
     * @param defaultValue  The default value to be returned
     */
    public StringLocaleConverter(Object defaultValue) {

        this(defaultValue, false);
    }

    /**
     * Create a {@link org.apache.commons.beanutils.locale.LocaleConverter}
     * that will return the specified default value
     * if a conversion error occurs. The locale is the default locale for
     * this instance of the Java Virtual Machine.
     *
     * @param defaultValue  The default value to be returned
     * @param locPattern    Indicate whether the pattern is localized or not
     */
    public StringLocaleConverter(Object defaultValue, boolean locPattern) {

        this(defaultValue, Locale.getDefault(), locPattern);
    }

    /**
     * Create a {@link org.apache.commons.beanutils.locale.LocaleConverter}
     * that will return the specified default value
     * if a conversion error occurs. An unlocalized pattern is used for the convertion.
     *
     * @param defaultValue  The default value to be returned
     * @param locale        The locale
     */
    public StringLocaleConverter(Object defaultValue, Locale locale) {

        this(defaultValue, locale, false);
    }

    /**
     * Create a {@link org.apache.commons.beanutils.locale.LocaleConverter}
     * that will return the specified default value
     * if a conversion error occurs.
     *
     * @param defaultValue  The default value to be returned
     * @param locale        The locale
     * @param locPattern    Indicate whether the pattern is localized or not
     */
    public StringLocaleConverter(Object defaultValue, Locale locale, boolean locPattern) {

        this(defaultValue, locale, null, locPattern);
    }

    /**
     * Create a {@link org.apache.commons.beanutils.locale.LocaleConverter}
     * that will return the specified default value
     * if a conversion error occurs. An unlocalized pattern is used for the convertion.
     *
     * @param defaultValue  The default value to be returned
     * @param locale        The locale
     * @param pattern       The convertion pattern
     */
    public StringLocaleConverter(Object defaultValue, Locale locale, String pattern) {

        this(defaultValue, locale, pattern, false);
    }

    /**
     * Create a {@link org.apache.commons.beanutils.locale.LocaleConverter}
     * that will return the specified default value
     * if a conversion error occurs.
     *
     * @param defaultValue  The default value to be returned
     * @param locale        The locale
     * @param pattern       The convertion pattern
     * @param locPattern    Indicate whether the pattern is localized or not
     */
    public StringLocaleConverter(Object defaultValue, Locale locale, String pattern, boolean locPattern) {

        super(defaultValue, locale, pattern, locPattern);
    }

    // --------------------------------------------------------- Methods

    /**
     * Convert the specified locale-sensitive input object into an output object of the
     * specified type.
     *
     * @param value The input object to be converted
     * @param pattern The pattern is used for the convertion
     * @return The converted value
     *
     * @exception org.apache.commons.beanutils.ConversionException if conversion
     * cannot be performed successfully
     * @throws ParseException if an error occurs
     */
    protected Object parse(Object value, String pattern) throws ParseException {

        String result = null;

        if ((value instanceof Integer) ||
                (value instanceof Long) ||
                (value instanceof BigInteger) ||
                (value instanceof Byte) ||
                (value instanceof Short)) {

            result = getDecimalFormat(locale, pattern).format(((Number) value).longValue());
        }
        else if ((value instanceof Double) ||
                (value instanceof BigDecimal) ||
                (value instanceof Float)) {

            result = getDecimalFormat(locale, pattern).format(((Number) value).doubleValue());
        }
        else if (value instanceof Date) { // java.util.Date, java.sql.Date, java.sql.Time, java.sql.Timestamp

            SimpleDateFormat dateFormat =
                    new SimpleDateFormat(pattern, locale);

            result = dateFormat.format(value);
        }
        else {
            result = value.toString();
        }

        return result;
    }

    /**
     * Make an instance of DecimalFormat.
     *
     * @param locale The locale
     * @param pattern The pattern is used for the convertion
     * @return The format for the locale and pattern
     *
     * @exception ConversionException if conversion cannot be performed
     *  successfully
     * @throws ParseException if an error occurs parsing a String to a Number
     */
    private DecimalFormat getDecimalFormat(Locale locale, String pattern) {

        DecimalFormat numberFormat = (DecimalFormat) NumberFormat.getInstance(locale);

        // if some constructors default pattern to null, it makes only sense to handle null pattern gracefully
        if (pattern != null) {
            if (locPattern) {
                numberFormat.applyLocalizedPattern(pattern);
            } else {
                numberFormat.applyPattern(pattern);
            }
        } else {
            log.debug("No pattern provided, using default.");
        }

        return numberFormat;
    }
}