Class FastDatePrinter

java.lang.Object
org.sqlite.date.FastDatePrinter
All Implemented Interfaces:
Serializable, DatePrinter

public class FastDatePrinter extends Object implements DatePrinter, Serializable
FastDatePrinter is a fast and thread-safe version of SimpleDateFormat.

To obtain a FastDatePrinter, use FastDateFormat.getInstance(String, TimeZone, Locale) or another variation of the factory methods of FastDateFormat.

Since FastDatePrinter is thread safe, you can use a static member instance: private static final DatePrinter DATE_PRINTER = FastDateFormat.getInstance("yyyy-MM-dd");

This class can be used as a direct replacement to SimpleDateFormat in most formatting situations. This class is especially useful in multi-threaded server environments. SimpleDateFormat is not thread-safe in any JDK version, nor will it be as Sun have closed the bug/RFE.

Only formatting is supported by this class, but all patterns are compatible with SimpleDateFormat (except time zones and some year patterns - see below).

Java 1.4 introduced a new pattern letter, 'Z', to represent time zones in RFC822 format (eg. +0800 or -1100). This pattern letter can be used here (on all JDK versions).

In addition, the pattern 'ZZ' has been made to represent ISO 8601 full format time zones (eg. +08:00 or -11:00). This introduces a minor incompatibility with Java 1.4, but at a gain of useful functionality.

Starting with JDK7, ISO 8601 support was added using the pattern 'X'. To maintain compatibility, 'ZZ' will continue to be supported, but using one of the 'X' formats is recommended.

Javadoc cites for the year pattern: For formatting, if the number of pattern letters is 2, the year is truncated to 2 digits; otherwise it is interpreted as a number. Starting with Java 1.7 a pattern of 'Y' or 'YYY' will be formatted as '2003', while it was '03' in former Java versions. FastDatePrinter implements the behavior of Java 7.

Since:
3.2
Version:
$Id$
See Also:
  • Field Details

  • Constructor Details

  • Method Details

    • init

      private void init()
      Initializes the instance for first use.
    • parsePattern

      protected List<FastDatePrinter.Rule> parsePattern()
      Returns a list of Rules given a pattern.
      Returns:
      a List of Rule objects
      Throws:
      IllegalArgumentException - if pattern is invalid
    • parseToken

      protected String parseToken(String pattern, int[] indexRef)
      Performs the parsing of tokens.
      Parameters:
      pattern - the pattern
      indexRef - index references
      Returns:
      parsed token
    • selectNumberRule

      protected FastDatePrinter.NumberRule selectNumberRule(int field, int padding)
      Gets an appropriate rule for the padding required.
      Parameters:
      field - the field to get a rule for
      padding - the padding required
      Returns:
      a new rule with the correct padding
    • format

      public StringBuffer format(Object obj, StringBuffer toAppendTo, FieldPosition pos)
      Formats a Date, Calendar or Long (milliseconds) object.
      Specified by:
      format in interface DatePrinter
      Parameters:
      obj - the object to format
      toAppendTo - the buffer to append to
      pos - the position - ignored
      Returns:
      the buffer passed in
    • format

      public String format(long millis)
      Description copied from interface: DatePrinter
      Formats a millisecond long value.
      Specified by:
      format in interface DatePrinter
      Parameters:
      millis - the millisecond value to format
      Returns:
      the formatted string
    • applyRulesToString

      private String applyRulesToString(Calendar c)
      Creates a String representation of the given Calendar by applying the rules of this printer to it.
      Parameters:
      c - the Calender to apply the rules to.
      Returns:
      a String representation of the given Calendar.
    • newCalendar

      private GregorianCalendar newCalendar()
      Creation method for ne calender instances.
      Returns:
      a new Calendar instance.
    • format

      public String format(Date date)
      Description copied from interface: DatePrinter
      Formats a Date object using a GregorianCalendar.
      Specified by:
      format in interface DatePrinter
      Parameters:
      date - the date to format
      Returns:
      the formatted string
    • format

      public String format(Calendar calendar)
      Description copied from interface: DatePrinter
      Formats a Calendar object.
      Specified by:
      format in interface DatePrinter
      Parameters:
      calendar - the calendar to format
      Returns:
      the formatted string
    • format

      public StringBuffer format(long millis, StringBuffer buf)
      Description copied from interface: DatePrinter
      Formats a millisecond long value into the supplied StringBuffer.
      Specified by:
      format in interface DatePrinter
      Parameters:
      millis - the millisecond value to format
      buf - the buffer to format into
      Returns:
      the specified string buffer
    • format

      public StringBuffer format(Date date, StringBuffer buf)
      Description copied from interface: DatePrinter
      Formats a Date object into the supplied StringBuffer using a GregorianCalendar.
      Specified by:
      format in interface DatePrinter
      Parameters:
      date - the date to format
      buf - the buffer to format into
      Returns:
      the specified string buffer
    • format

      public StringBuffer format(Calendar calendar, StringBuffer buf)
      Description copied from interface: DatePrinter
      Formats a Calendar object into the supplied StringBuffer.
      Specified by:
      format in interface DatePrinter
      Parameters:
      calendar - the calendar to format
      buf - the buffer to format into
      Returns:
      the specified string buffer
    • applyRules

      protected StringBuffer applyRules(Calendar calendar, StringBuffer buf)
      Performs the formatting by applying the rules to the specified calendar.
      Parameters:
      calendar - the calendar to format
      buf - the buffer to format into
      Returns:
      the specified string buffer
    • getPattern

      public String getPattern()
      Description copied from interface: DatePrinter
      Gets the pattern used by this printer.
      Specified by:
      getPattern in interface DatePrinter
      Returns:
      the pattern, SimpleDateFormat compatible
    • getTimeZone

      public TimeZone getTimeZone()
      Description copied from interface: DatePrinter
      Gets the time zone used by this printer.

      This zone is always used for Date printing.

      Specified by:
      getTimeZone in interface DatePrinter
      Returns:
      the time zone
    • getLocale

      public Locale getLocale()
      Description copied from interface: DatePrinter
      Gets the locale used by this printer.
      Specified by:
      getLocale in interface DatePrinter
      Returns:
      the locale
    • getMaxLengthEstimate

      public int getMaxLengthEstimate()
      Gets an estimate for the maximum string length that the formatter will produce.

      The actual formatted length will almost always be less than or equal to this amount.

      Returns:
      the maximum formatted length
    • equals

      public boolean equals(Object obj)
      Compares two objects for equality.
      Overrides:
      equals in class Object
      Parameters:
      obj - the object to compare to
      Returns:
      true if equal
    • hashCode

      public int hashCode()
      Returns a hashcode compatible with equals.
      Overrides:
      hashCode in class Object
      Returns:
      a hashcode compatible with equals
    • toString

      public String toString()
      Gets a debugging string version of this formatter.
      Overrides:
      toString in class Object
      Returns:
      a debugging string
    • readObject

      private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException
      Create the object after serialization. This implementation reinitializes the transient properties.
      Parameters:
      in - ObjectInputStream from which the object is being deserialized.
      Throws:
      IOException - if there is an IO issue.
      ClassNotFoundException - if a class cannot be found.
    • appendDigits

      private static void appendDigits(StringBuffer buffer, int value)
      Appends digits to the given buffer.
      Parameters:
      buffer - the buffer to append to.
      value - the value to append digits from.
    • getTimeZoneDisplay

      static String getTimeZoneDisplay(TimeZone tz, boolean daylight, int style, Locale locale)
      Gets the time zone display name, using a cache for performance.
      Parameters:
      tz - the zone to query
      daylight - true if daylight savings
      style - the style to use TimeZone.LONG or TimeZone.SHORT
      locale - the locale to use
      Returns:
      the textual name of the time zone