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ArangoDB Java Driver
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/*
 * Copyright (C) 2012 tamtam180
 *
 * 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 com.arangodb.util;

import java.io.Serializable;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.TimeZone;

import com.google.gson.JsonParseException;

/**
 * @author tamtam180 - kirscheless at gmail.com
 *
 */
public class DateUtils {

  static class TripleKey implements Serializable {
    private static final long serialVersionUID = 2612228100559578823L;
    private T first;
    private U second;
    private V third;
    public TripleKey() {
    }
    public TripleKey(T first, U second, V third) {
      this.first = first;
      this.second = second;
      this.third = third;
    }
    public T getFirst() {
      return first;
    }
    public void setFirst(T first) {
      this.first = first;
    }
    public U getSecond() {
      return second;
    }
    public void setSecond(U second) {
      this.second = second;
    }
    public V getThird() {
      return third;
    }
    public void setThird(V third) {
      this.third = third;
    }
    @Override
    public int hashCode() {
      final int prime = 31;
      int result = 1;
      result = prime * result + ((first == null) ? 0 : first.hashCode());
      result = prime * result + ((second == null) ? 0 : second.hashCode());
      result = prime * result + ((third == null) ? 0 : third.hashCode());
      return result;
    }
    @Override
    public boolean equals(Object obj) {
      if (this == obj)
        return true;
      if (obj == null)
        return false;
      if (getClass() != obj.getClass())
        return false;
      TripleKey other = (TripleKey) obj;
      if (first == null) {
        if (other.first != null)
          return false;
      } else if (!first.equals(other.first))
        return false;
      if (second == null) {
        if (other.second != null)
          return false;
      } else if (!second.equals(other.second))
        return false;
      if (third == null) {
        if (other.third != null)
          return false;
      } else if (!third.equals(other.third))
        return false;
      return true;
    }
  }

  
  private static class LocalFormat {
    private HashMap, SimpleDateFormat> sdfMap = new HashMap, SimpleDateFormat>();
    public SimpleDateFormat getDateFormat(String format, Locale locale, TimeZone timeZone) {
      TripleKey key = new TripleKey(format, locale, timeZone);
      SimpleDateFormat sdf = sdfMap.get(key);
      if (sdf == null) {
        sdf = new SimpleDateFormat(format);
        sdf.setTimeZone(timeZone);
        sdfMap.put(key, sdf);
      }
      return sdf;
    }
    
  }
  
  private static ThreadLocal dateFormats = new ThreadLocal() {
    @Override
    protected LocalFormat initialValue() {
      return new LocalFormat();
    }
  };  
  
  private static TimeZone utcTimeZone = TimeZone.getTimeZone("UTC");
  
  public static Date parse(String text, String format) throws ParseException { 
    
    SimpleDateFormat dateFormat = dateFormats.get().getDateFormat(format, Locale.US, utcTimeZone);
    Date date = dateFormat.parse(text);
    return date;
    
  }
  
  /**
   * Parse date-string in "yyyy-MM-dd'T'HH:mm:ss'Z'" format.
   * @param dateString
   * @return
   */
  public static Date parse(String dateString) {

    try {
      return DateUtils.parse(dateString, "yyyy-MM-dd'T'HH:mm:ss'Z'");
    } catch (ParseException e) {
      throw new JsonParseException("time format invalid:" + dateString);
    }

  }
  
  public static String format(Date date, String format) {

    SimpleDateFormat dateFormat = dateFormats.get().getDateFormat(format, Locale.US, TimeZone.getDefault());
    String text = dateFormat.format(date);
    return text;
    
  }
  
}