johnzon-mapper/src/main/java/org/apache/johnzon/mapper/converter/DateConverter.java

/*
 * 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.johnzon.mapper.converter;

import org.apache.johnzon.mapper.Converter;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DateConverter implements Converter<Date> {
    // TODO: see if we can clean it
    private final ThreadLocal<DateFormat> format;

    public DateConverter(final String pattern) {
        format = new ThreadLocal<DateFormat>() {
            @Override
            protected DateFormat initialValue() {
                return new SimpleDateFormat(pattern);
            }
        };
    }

    @Override
    public String toString(final Date instance) {
        return format.get().format(instance);
    }

    @Override
    public Date fromString(final String text) {
        try {
            return format.get().parse(text);
        } catch (final ParseException e) {
            throw new IllegalArgumentException(e);
        }
    }
}