org.gbif.registry.metasync.util.converter.DateTimeConverter.java Source code

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Here is the source code for org.gbif.registry.metasync.util.converter.DateTimeConverter.java

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/*
 * Copyright 2013 Global Biodiversity Information Facility (GBIF)
 *
 * 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.gbif.registry.metasync.util.converter;

import org.apache.commons.beanutils.Converter;
import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Used by commons-digester (via commons-beanutils) to convert Strings into {@link DateTime}s from Joda Time assuming
 * that all those Strings are in ISO 8601 form but where the time is optional.
 */
public class DateTimeConverter implements Converter {

    private static final Logger LOG = LoggerFactory.getLogger(DateTimeConverter.class);
    private final DateTimeFormatter formatter = ISODateTimeFormat.dateOptionalTimeParser();

    @Override
    public Object convert(Class type, Object value) {
        checkNotNull(type, "type cannot be null");
        checkNotNull(value, "Value cannot be null");
        checkArgument(type.equals(DateTime.class), "Conversion target should be org.joda.time.DateTime, but is %s",
                type.getClass());
        checkArgument(String.class.isAssignableFrom(value.getClass()), "Value should be a string, but is a %s",
                value.getClass());
        DateTime dateTime = null;
        try {
            dateTime = formatter.parseDateTime((String) value);
        } catch (IllegalArgumentException e) {
            LOG.debug("Could not parse date: [{}]", value, e);
        }
        return dateTime;
    }

}