DateTimeAttribute.java

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/*
 * Project: Server for annotations sharing
 * Author: Ing. Jaroslav Dytrych idytrych@fit.vutbr.cz, Jan Planer xplane01@stud.fit.vutbr.cz
 * File: DateTimeAttribute.java
 * Description: Class representing attribute of type DateTime
 */

package cz.vutbr.fit.knot.annotations.entity.attribute;

import cz.vutbr.fit.knot.annotations.app.Constants;
import cz.vutbr.fit.knot.annotations.comet.Util;
import java.util.Date;
import java.util.TimeZone;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;

/**
 * @file DateTimeAttribute.java
 *
 * @brief Class representing attribute of type DateTime
 */

/**
 * Class representing attribute of type DateTime
 * 
 * @brief Class representing attribute of type DateTime
 */
@Entity
@DiscriminatorValue("DateTime")
public class DateTimeAttribute extends BaseAttribute {
       
  /**
   * Gets value of the attribute
   * 
   * @return value of the attribute
   */
  @Override
  public Object getValue() {
    return dateValue;
  }

  /**
   * Sets value of the attribute. Value should already be a native java Date value. 
   * 
   * @param value new value of the attribute
   */
  @Override
  public void setValue(Object value) {
    this.dateValue = (Date) value;
  }

  /**
   * Converts date to string in format according to RFC 3339
   * 
   * @return Date in string in format according to RFC 3339
   */
  @Override
  protected String xmlFormatValue() {
    if (dateValue == null) {
      return "";
    }
    if(this.stringValue != null){
      String originalOffset = TimeZone.getDefault().getID();
      TimeZone.setDefault(TimeZone.getTimeZone("GMT" + this.stringValue));
      String ret = Util.toRFC3339Date(dateValue);
      TimeZone.setDefault(TimeZone.getTimeZone(originalOffset));
      return ret;
    }
    else{
      return Util.toRFC3339Date(dateValue);
    }
  }

  /**
   * Parses provided value and sets that value as a value of attribute
   * 
   * @param value Date time value in format according to RFC 3339
   */
  @Override
  public void setRawValue(String value) throws IllegalArgumentException {
    if(value == null){
        return;
    }
      
    String zone = Util.parseTimeZoneID(value);
    String originalOffset = TimeZone.getDefault().getID();
    if(zone != null){
      TimeZone.setDefault(TimeZone.getTimeZone("GMT" + zone));
      this.stringValue = zone;
    }
    try {
      this.dateValue = Util.parseRFC3339Date(value);
    } catch (Exception e) {
      throw new IllegalArgumentException("Value " + value + " is not a valid RFC3339 date time");
    }
    if(zone != null){
      TimeZone.setDefault(TimeZone.getTimeZone(originalOffset));
    }
  }

  /**
   * Gets URI addres in ontology for this type of attribute
   * 
   * @return Return URI addres in ontology for this type of attribute.
   */
  @Override
  public String getTypeOntologyUri(){
      return Constants.DATE_TIME_URI;
  }
}  // class DateTimeAttribute