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package org.milyn.javabean.decoders;

import org.milyn.config.Configurable;
import org.milyn.cdr.SmooksConfigurationException;

import java.text.*;
import java.util.*;

/**
 * LocaleAwareDateDecoder is a decoder 'helper' that can be subclassed by Date decoders to enable
 * them to use locale specific date formats.
 * 
 * Usage (on Java Binding value config using the {@link org.milyn.javabean.decoders.DateDecoder}):
 * 
 * <jb:value property="date" decoder="Date" data="order/@date">
 *     <-- Format: Defaults to "yyyy-MM-dd'T'HH:mm:ss" (SOAP) -->
 *     <jb:decodeParam name="format">EEE MMM dd HH:mm:ss z yyyy</jb:decodeParam>
 *     <-- Locale: Defaults to machine Locale -->
 *     <jb:decodeParam name="locale">sv-SE</jb:decodeParam>
 *     <-- Verify Locale: Default false -->
 *     <jb:decodeParam name="verify-locale">true</jb:decodeParam>
 * </jb:value>
 * 
 *
 * @author [email protected]
 */
public abstract class LocaleAwareDateDecoder extends LocaleAwareDecoder
{
    /**
     * Date format configuration key.
     */
    public static final String FORMAT = "format";

    /**
     * Default date format string.
     */
    public static final String DEFAULT_DATE_FORMAT = "yyyy-MM-dd'T'HH:mm:ss";

    /**
     * ISO Language Code. Lower case two-letter code defined by ISO-639
     * @deprecated Use {@link LocaleAwareDecoder}.
     */
    public static final String LOCALE_LANGUAGE_CODE = "locale-language";

    /**
     * ISO Country Code. Upper case two-letter code defined by ISO-3166
     * @deprecated Use {@link LocaleAwareDecoder}.
     */
    public static final String LOCALE_COUNTRY_CODE = "locale-country";

    /**
     * True or false(default).
     * Whether or not a check should be performed to verify that
     * the specified locale is installed. This operation can take some
     * time and should be turned off in a production evironment
     * @deprecated Use {@link LocaleAwareDecoder}.
     */
    public static final String VERIFY_LOCALE = "verify-locale";

    protected String format;

    /*
     * 	Need to initialize a default decoder as not calls can be make
     * 	directly to decode without calling setConfigurtion.
     */
    protected SimpleDateFormat decoder = new SimpleDateFormat( DEFAULT_DATE_FORMAT );

    public void setConfiguration(Properties resourceConfig) throws SmooksConfigurationException {
        super.setConfiguration(resourceConfig);

        format = resourceConfig.getProperty(FORMAT, DEFAULT_DATE_FORMAT);
        if (format == null) {
            throw new SmooksConfigurationException("Decoder must specify a 'format' parameter.");
        }

        Locale configuredLocale = getLocale();
        if(configuredLocale != null) {
            decoder = new SimpleDateFormat(format.trim(), configuredLocale);
        } else {
            decoder = new SimpleDateFormat(format.trim());
        }
    }
}