org.primefaces.extensions.converter.LocaleConverter.java Source code

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Here is the source code for org.primefaces.extensions.converter.LocaleConverter.java

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/**
 * Copyright 2011-2018 PrimeFaces Extensions
 *
 * 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 org.primefaces.extensions.converter;

import java.io.Serializable;
import java.util.Locale;

import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.ConverterException;
import javax.faces.convert.FacesConverter;

import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.StringUtils;
import org.primefaces.util.Constants;

/**
 * {@link Converter} which converts a string to a {@link java.util.Locale} an vice-versa.
 *
 * @author Thomas Andraschko / last modified by $Author$
 * @version $Revision$
 * @since 0.2
 */
@FacesConverter(value = "org.primefaces.extensions.converter.LocaleConverter")
public class LocaleConverter implements Converter, Serializable {

    private static final long serialVersionUID = 20121214L;

    private char separator = '_';

    public Object getAsObject(final FacesContext fc, final UIComponent component, final String value) {
        if (StringUtils.isBlank(value)) {
            return fc.getApplication().getDefaultLocale();
        }

        return getLocaleObject(value, separator);
    }

    public String getAsString(final FacesContext fc, final UIComponent component, final Object value) {
        if (value == null) {
            final Locale defaultLocale = fc.getApplication().getDefaultLocale();
            if (defaultLocale == null) {
                return null;
            }

            return getLocaleString(defaultLocale, separator);
        }

        if (value instanceof String) {
            return (String) value;
        } else if (value instanceof Locale) {
            return getLocaleString((Locale) value, separator);
        } else {
            throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR,
                    "Wrong type: '" + value.getClass().getSimpleName() + "' is not 'Locale'.",
                    Constants.EMPTY_STRING));
        }
    }

    public static Locale getLocaleObject(final String locale, final char seperator) {
        String replacedLocale = locale;
        if (seperator != '-' && seperator != '_') {
            replacedLocale = replacedLocale.replace(seperator, '_');
        }

        replacedLocale = replacedLocale.replace('-', '_');

        final String[] parts = replacedLocale.split("_");
        if (parts.length == 0 || !parts[0].matches("[a-zA-Z]{2,2}")
                || (parts.length > 1 && parts[1].length() != 0 && !parts[1].matches("[a-zA-Z]{2,2}"))) {
            throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR,
                    "'" + locale + "' does not represent a valid locale", Constants.EMPTY_STRING));
        }

        switch (parts.length) {
        case 3:
            return new Locale(parts[0], parts[1], parts[2]);

        case 2:
            return new Locale(parts[0], parts[1]);

        case 1:
            return new Locale(parts[0]);

        default:
            return new Locale(parts[0], parts[1],
                    StringUtils.join(ArrayUtils.subarray(parts, 2, parts.length), '_'));
        }
    }

    public static String getLocaleString(final Locale locale, final char seperator) {
        if (StringUtils.isBlank(locale.getCountry())) {
            return locale.getLanguage();
        }

        return locale.getLanguage() + seperator + locale.getCountry();
    }

    public char getSeparator() {
        return separator;
    }

    public void setSeparator(char separator) {
        this.separator = separator;
    }
}