org.commonjava.freeki.model.io.DateSerializer.java Source code

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Here is the source code for org.commonjava.freeki.model.io.DateSerializer.java

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/*******************************************************************************
 * Copyright (C) 2013 John Casey.
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package org.commonjava.freeki.model.io;

import java.lang.reflect.Type;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.commonjava.web.json.ser.WebSerializationAdapter;

import com.google.gson.GsonBuilder;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

public class DateSerializer implements WebSerializationAdapter, JsonSerializer<Date>, JsonDeserializer<Date> {

    public static final String DATE_FORMAT = "yyyy-MM-dd kk:mm Z";

    @Override
    public void register(final GsonBuilder gsonBuilder) {
        gsonBuilder.registerTypeAdapter(Date.class, this);
    }

    @Override
    public Date deserialize(final JsonElement src, final Type type, final JsonDeserializationContext ctx)
            throws JsonParseException {
        final String s = src.getAsString();
        if (s.trim().length() < 1) {
            return null;
        }

        try {
            return parseDate(s);
        } catch (final ParseException e) {
            throw new JsonParseException(String.format("Failed to parse date: '%s'. Reason: %s", s, e.getMessage()),
                    e);
        }
    }

    public static Date parseDate(final String s) throws ParseException {
        return new SimpleDateFormat(DATE_FORMAT).parse(s);
    }

    @Override
    public JsonElement serialize(final Date src, final Type type, final JsonSerializationContext ctx) {
        return new JsonPrimitive(src == null ? "" : formatDate(src));
    }

    public static String formatDate(final Date src) {
        return new SimpleDateFormat(DATE_FORMAT).format(src);
    }

}