001/*
002 * Licensed under the Apache License, Version 2.0 (the "License");
003 * you may not use this file except in compliance with the License.
004 * You may obtain a copy of the License at
005 *
006 *     http://www.apache.org/licenses/LICENSE-2.0
007 *
008 * Unless required by applicable law or agreed to in writing, software
009 * distributed under the License is distributed on an "AS IS" BASIS,
010 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
011 * See the License for the specific language governing permissions and
012 * limitations under the License.
013 */
014package org.gbif.ws.client;
015
016import java.text.ParseException;
017import java.text.SimpleDateFormat;
018import java.util.Date;
019
020import org.slf4j.Logger;
021import org.slf4j.LoggerFactory;
022
023import feign.Param;
024
025/**
026 * Convert date string from the default {@link Date} format to custom 'yyyy-MM'.
027 */
028public class PartialDateExpander implements Param.Expander {
029
030  private static final Logger LOG = LoggerFactory.getLogger(PartialDateExpander.class);
031
032  private static final String UTIL_DATE_FORMAT_PATTERN = "EEE MMM dd HH:mm:ss zzz yyyy";
033  private static final String CUSTOM_DATE_FORMAT_PATTERN = "yyyy-MM";
034
035  @Override
036  public String expand(Object value) {
037    return convertDate(value);
038  }
039
040  private String convertDate(Object rawDate) {
041    Date utilDate;
042
043    try {
044      utilDate = new SimpleDateFormat(UTIL_DATE_FORMAT_PATTERN).parse(rawDate.toString());
045    } catch (ParseException e) {
046      LOG.error("Wrong date format {}. Expected format: {}", rawDate, UTIL_DATE_FORMAT_PATTERN);
047      return null;
048    }
049
050    return new SimpleDateFormat(CUSTOM_DATE_FORMAT_PATTERN).format(utilDate);
051  }
052}