contrib/rss/src/main/java/org/apache/abdera/contrib/rss/RssDateTime.java

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  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.  For additional information regarding
* copyright in this work, please see the NOTICE file in the top level
* directory of this distribution.
*/
package org.apache.abdera.contrib.rss;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

import javax.xml.namespace.QName;

import org.apache.abdera.factory.Factory;
import org.apache.abdera.model.AtomDate;
import org.apache.abdera.model.DateTime;
import org.apache.abdera.model.DateTimeWrapper;
import org.apache.abdera.model.Element;

public class RssDateTime 
  extends DateTimeWrapper 
  implements DateTime {

  private static String[] masks = {
    "EEE, dd MMM yyyy HH:mm:ss z",
    "dd MMM yyyy HH:mm z",
    "dd MMM yyyy",
    "-yy-MM-dd",
    "-yy-MM",
    "-yymm",
    "yyyy-MM-dd HH:mm:ss.SSS",
    "yyyy-MM-dd HH:mm:ss",
    "yyyy-MM-dd'T'HH:mm:ss.SSSz",
    "yyyy-MM-dd't'HH:mm:ss.SSSz",                         // invalid
    "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'",
    "yyyy-MM-dd't'HH:mm:ss.SSS'z'",                       // invalid
    "yyyy-MM-dd'T'HH:mm:ssz",
    "yyyy-MM-dd't'HH:mm:ssz",                             // invalid
    "yyyy-MM-dd'T'HH:mm:ss'Z'",
    "yyyy-MM-dd't'HH:mm:ss'Z'",                           // invalid
    "yyyy-MM-dd't'HH:mm:ss'z'",                           // invalid
    "yyyy-MM-dd'T'HH:mm:ss'z'",                           // invalid
    "yyyy-MM-dd'T'HH:mm:ss'z'",                           // invalid
    "yyyy-MM-dd'T'HH:mmz",                                // invalid
    "yyyy-MM-dd't'HH:mmz",                                // invalid
    "yyyy-MM-dd'T'HH:mm'Z'",                              // invalid
    "yyyy-MM-dd't'HH:mm'z'",                              // invalid
    "yyyy-MM-dd",
    "yyyy-MM",
    "yyyyMMdd",
    "yyMMdd",
    "yyyy"
  };
  
  public RssDateTime(Element internal) {
    super(internal);
  }

  public RssDateTime(Factory factory, QName qname) {
    super(factory, qname);
  }

  @Override
  public AtomDate getValue() {
    return parse(getText());
  }

  @Override
  public DateTime setCalendar(Calendar date) {
    throw new UnsupportedOperationException("Modifications are not allowed");
  }

  @Override
  public DateTime setDate(Date date) {
    throw new UnsupportedOperationException("Modifications are not allowed");
  }

  @Override
  public DateTime setString(String date) {
    throw new UnsupportedOperationException("Modifications are not allowed");
  }

  @Override
  public DateTime setTime(long date) {
    throw new UnsupportedOperationException("Modifications are not allowed");
  }

  @Override
  public DateTime setValue(AtomDate dateTime) {
    throw new UnsupportedOperationException("Modifications are not allowed");
  }

  private AtomDate parse(String value) {
    for (String mask : masks) {
      try {
        SimpleDateFormat sdf = new SimpleDateFormat(mask);
        sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
        Date d = sdf.parse(value);
        return new AtomDate(d);
      } catch (Exception e) {}
    }
    return null;
  }
}