Enum AmPm

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<AmPm>, java.time.temporal.TemporalAccessor, java.time.temporal.TemporalAdjuster

    public enum AmPm
    extends java.lang.Enum<AmPm>
    implements java.time.temporal.TemporalAccessor, java.time.temporal.TemporalAdjuster
    A half-day before or after midday, with the values 'AM' and 'PM'.

    AmPm is an enum representing the half-day concepts of AM and PM. AM is defined as from 00:00 to 11:59, while PM is defined from 12:00 to 23:59.

    All date-time fields have an int value. The int value follows Calendar, assigning 0 to AM and 1 to PM. It is recommended that applications use the enum rather than the int value to ensure code clarity.

    Do not use ordinal() to obtain the numeric representation of AmPm. Use getValue() instead.

    This enum represents a common concept that is found in many calendar systems. As such, this enum may be used by any calendar system that has the AM/PM concept defined exactly equivalent to the ISO calendar system.

    Implementation Requirements:

    This is an immutable and thread-safe enum.
    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
      AM
      The singleton instance for the morning, AM - ante meridiem.
      PM
      The singleton instance for the afternoon, PM - post meridiem.
    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.time.temporal.Temporal adjustInto​(java.time.temporal.Temporal temporal)
      Adjusts the specified temporal object to have this am-pm value.
      static AmPm from​(java.time.temporal.TemporalAccessor temporal)
      Obtains an instance of AmPm from a temporal object.
      int get​(java.time.temporal.TemporalField field)
      Gets the value of the specified field from this am-pm as an int.
      java.lang.String getDisplayName​(java.time.format.TextStyle style, java.util.Locale locale)
      Gets the textual representation, such as 'AM' or 'PM'.
      long getLong​(java.time.temporal.TemporalField field)
      Gets the value of the specified field from this am-pm as a long.
      int getValue()
      Gets the AM/PM int value.
      boolean isSupported​(java.time.temporal.TemporalField field)
      Checks if the specified field is supported.
      static AmPm of​(int amPmValue)
      Obtains an instance of AmPm from an int value.
      static AmPm ofHour​(int hourOfDay)
      Obtains an instance of AmPm from an hour-of-day.
      <R> R query​(java.time.temporal.TemporalQuery<R> query)
      Queries this am-pm using the specified query.
      java.time.temporal.ValueRange range​(java.time.temporal.TemporalField field)
      Gets the range of valid values for the specified field.
      static AmPm valueOf​(java.lang.String name)
      Returns the enum constant of this type with the specified name.
      static AmPm[] values()
      Returns an array containing the constants of this enum type, in the order they are declared.
      • Methods inherited from class java.lang.Enum

        clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
      • Methods inherited from class java.lang.Object

        getClass, notify, notifyAll, wait, wait, wait
    • Enum Constant Detail

      • AM

        public static final AmPm AM
        The singleton instance for the morning, AM - ante meridiem. This has the numeric value of 0.
      • PM

        public static final AmPm PM
        The singleton instance for the afternoon, PM - post meridiem. This has the numeric value of 1.
    • Method Detail

      • values

        public static AmPm[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
        for (AmPm c : AmPm.values())
            System.out.println(c);
        
        Returns:
        an array containing the constants of this enum type, in the order they are declared
      • valueOf

        public static AmPm valueOf​(java.lang.String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
        java.lang.NullPointerException - if the argument is null
      • of

        public static AmPm of​(int amPmValue)
        Obtains an instance of AmPm from an int value.

        AmPm is an enum representing before and after midday. This factory allows the enum to be obtained from the int value. The int value follows Calendar, assigning 0 to AM and 1 to PM.

        Parameters:
        amPmValue - the AM/PM value to represent, from 0 (AM) to 1 (PM)
        Returns:
        the AM/PM, not null
        Throws:
        java.time.DateTimeException - if the am-pm is invalid
      • ofHour

        public static AmPm ofHour​(int hourOfDay)
        Obtains an instance of AmPm from an hour-of-day.

        AmPm is an enum representing before and after midday. This factory allows the enum to be obtained from the hour-of-day value, from 0 to 23.

        Parameters:
        hourOfDay - the hour-of-day to extract from, from 0 to 23
        Returns:
        the AM/PM, not null
        Throws:
        java.time.DateTimeException - if the hour-of-day is invalid
      • from

        public static AmPm from​(java.time.temporal.TemporalAccessor temporal)
        Obtains an instance of AmPm from a temporal object.

        This obtains an am-pm based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of AmPm.

        The conversion extracts the AMPM_OF_DAY field.

        This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, AmPm::from.

        Parameters:
        temporal - the temporal object to convert, not null
        Returns:
        the AM/PM, not null
        Throws:
        java.time.DateTimeException - if unable to convert to a AmPm
      • getValue

        public int getValue()
        Gets the AM/PM int value.

        The values are numbered following Calendar, assigning 0 to AM and 1 to PM.

        Returns:
        the AM/PM value, from 0 (AM) to 1 (PM)
      • getDisplayName

        public java.lang.String getDisplayName​(java.time.format.TextStyle style,
                                               java.util.Locale locale)
        Gets the textual representation, such as 'AM' or 'PM'.

        This returns the textual name used to identify the am-pm, suitable for presentation to the user. The parameters control the style of the returned text and the locale.

        If no textual mapping is found then the numeric value is returned.

        Parameters:
        style - the length of the text required, not null
        locale - the locale to use, not null
        Returns:
        the text value of the am-pm, not null
      • isSupported

        public boolean isSupported​(java.time.temporal.TemporalField field)
        Checks if the specified field is supported.

        This checks if this am-pm can be queried for the specified field. If false, then calling the range and get methods will throw an exception.

        If the field is AMPM_OF_DAY then this method returns true. All other ChronoField instances will return false.

        If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.isSupportedBy(TemporalAccessor) passing this as the argument. Whether the field is supported is determined by the field.

        Specified by:
        isSupported in interface java.time.temporal.TemporalAccessor
        Parameters:
        field - the field to check, null returns false
        Returns:
        true if the field is supported on this am-pm, false if not
      • range

        public java.time.temporal.ValueRange range​(java.time.temporal.TemporalField field)
        Gets the range of valid values for the specified field.

        The range object expresses the minimum and maximum valid values for a field. This am-pm is used to enhance the accuracy of the returned range. If it is not possible to return the range, because the field is not supported or for some other reason, an exception is thrown.

        If the field is AMPM_OF_DAY then the range of the am-pm, from 0 to 1, will be returned. All other ChronoField instances will throw an UnsupportedTemporalTypeException.

        If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.rangeRefinedBy(TemporalAccessor) passing this as the argument. Whether the range can be obtained is determined by the field.

        Specified by:
        range in interface java.time.temporal.TemporalAccessor
        Parameters:
        field - the field to query the range for, not null
        Returns:
        the range of valid values for the field, not null
        Throws:
        java.time.DateTimeException - if the range for the field cannot be obtained
        java.time.temporal.UnsupportedTemporalTypeException - if the field is not supported
      • get

        public int get​(java.time.temporal.TemporalField field)
        Gets the value of the specified field from this am-pm as an int.

        This queries this am-pm for the value for the specified field. The returned value will always be within the valid range of values for the field. If it is not possible to return the value, because the field is not supported or for some other reason, an exception is thrown.

        If the field is AMPM_OF_DAY then the value of the am-pm, from 0 (AM) to 1 (PM), will be returned. All other ChronoField instances will throw an UnsupportedTemporalTypeException.

        If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.getFrom(TemporalAccessor) passing this as the argument. Whether the value can be obtained, and what the value represents, is determined by the field.

        Specified by:
        get in interface java.time.temporal.TemporalAccessor
        Parameters:
        field - the field to get, not null
        Returns:
        the value for the field, within the valid range of values
        Throws:
        java.time.DateTimeException - if a value for the field cannot be obtained or the value is outside the range of valid values for the field
        java.time.temporal.UnsupportedTemporalTypeException - if the field is not supported or the range of values exceeds an int
        java.lang.ArithmeticException - if numeric overflow occurs
      • getLong

        public long getLong​(java.time.temporal.TemporalField field)
        Gets the value of the specified field from this am-pm as a long.

        This queries this am-pm for the value for the specified field. If it is not possible to return the value, because the field is not supported or for some other reason, an exception is thrown.

        If the field is AMPM_OF_DAY then the value of the am-pm, from 0 (AM) to 1 (PM), will be returned. All other ChronoField instances will throw an UnsupportedTemporalTypeException.

        If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.getFrom(TemporalAccessor) passing this as the argument. Whether the value can be obtained, and what the value represents, is determined by the field.

        Specified by:
        getLong in interface java.time.temporal.TemporalAccessor
        Parameters:
        field - the field to get, not null
        Returns:
        the value for the field
        Throws:
        java.time.DateTimeException - if a value for the field cannot be obtained
        java.time.temporal.UnsupportedTemporalTypeException - if the field is not supported
        java.lang.ArithmeticException - if numeric overflow occurs
      • query

        public <R> R query​(java.time.temporal.TemporalQuery<R> query)
        Queries this am-pm using the specified query.

        This queries this am-pm using the specified query strategy object. The TemporalQuery object defines the logic to be used to obtain the result. Read the documentation of the query to understand what the result of this method will be.

        The result of this method is obtained by invoking the TemporalQuery.queryFrom(TemporalAccessor) method on the specified query passing this as the argument.

        Specified by:
        query in interface java.time.temporal.TemporalAccessor
        Type Parameters:
        R - the type of the result
        Parameters:
        query - the query to invoke, not null
        Returns:
        the query result, null may be returned (defined by the query)
        Throws:
        java.time.DateTimeException - if unable to query (defined by the query)
        java.lang.ArithmeticException - if numeric overflow occurs (defined by the query)
      • adjustInto

        public java.time.temporal.Temporal adjustInto​(java.time.temporal.Temporal temporal)
        Adjusts the specified temporal object to have this am-pm value.

        This returns a temporal object of the same observable type as the input with the am-pm changed to be the same as this.

        The adjustment is equivalent to using Temporal.with(TemporalField, long) passing ChronoField.AMPM_OF_DAY as the field. Note that this adjusts forwards or backwards within a day.

        In most cases, it is clearer to reverse the calling pattern by using Temporal.with(TemporalAdjuster):

           // these two lines are equivalent, but the second approach is recommended
           temporal = thisAmPm.adjustInto(temporal);
           temporal = temporal.with(thisAmPm);
         

        This instance is immutable and unaffected by this method call.

        Specified by:
        adjustInto in interface java.time.temporal.TemporalAdjuster
        Parameters:
        temporal - the target object to be adjusted, not null
        Returns:
        the adjusted object, not null
        Throws:
        java.time.DateTimeException - if unable to make the adjustment
        java.lang.ArithmeticException - if numeric overflow occurs