org.joda.time.base
Class BaseSingleFieldPeriod

java.lang.Object
  extended by org.joda.time.base.BaseSingleFieldPeriod
All Implemented Interfaces:
Serializable, Comparable<BaseSingleFieldPeriod>, ReadablePeriod
Direct Known Subclasses:
Days, Hours, Minutes, Months, Seconds, Weeks, Years

public abstract class BaseSingleFieldPeriod
extends Object
implements ReadablePeriod, Comparable<BaseSingleFieldPeriod>, Serializable

BaseSingleFieldPeriod is an abstract implementation of ReadablePeriod that manages a single duration field, such as days or minutes.

This class should generally not be used directly by API users. The ReadablePeriod interface should be used when different kinds of period objects are to be referenced.

BaseSingleFieldPeriod subclasses may be mutable and not thread-safe.

Since:
1.4
Author:
Stephen Colebourne
See Also:
Serialized Form

Constructor Summary
protected BaseSingleFieldPeriod(int period)
          Creates a new instance representing the specified period.
 
Method Summary
protected static int between(ReadableInstant start, ReadableInstant end, DurationFieldType field)
          Calculates the number of whole units between the two specified datetimes.
protected static int between(ReadablePartial start, ReadablePartial end, ReadablePeriod zeroInstance)
          Calculates the number of whole units between the two specified partial datetimes.
 int compareTo(BaseSingleFieldPeriod other)
          Compares this period to another object of the same class.
 boolean equals(Object period)
          Compares this object with the specified object for equality based on the value of each field.
 int get(DurationFieldType type)
          Gets the value of a duration field represented by this period.
abstract  DurationFieldType getFieldType()
          Gets the single duration field type.
 DurationFieldType getFieldType(int index)
          Gets the field type at the specified index.
abstract  PeriodType getPeriodType()
          Gets the period type which matches the duration field type.
protected  int getValue()
          Gets the amount of this period.
 int getValue(int index)
          Gets the value at the specified index.
 int hashCode()
          Gets a hash code for the period as defined by ReadablePeriod.
 boolean isSupported(DurationFieldType type)
          Checks whether the duration field specified is supported by this period.
protected  void setValue(int value)
          Sets the amount of this period.
 int size()
          Gets the number of fields that this period supports, which is one.
protected static int standardPeriodIn(ReadablePeriod period, long millisPerUnit)
          Creates a new instance representing the number of complete standard length units in the specified period.
 MutablePeriod toMutablePeriod()
          Get this object as a MutablePeriod.
 Period toPeriod()
          Get this period as an immutable Period object.
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface org.joda.time.ReadablePeriod
toString
 

Constructor Detail

BaseSingleFieldPeriod

protected BaseSingleFieldPeriod(int period)
Creates a new instance representing the specified period.

Parameters:
period - the period to represent
Method Detail

between

protected static int between(ReadableInstant start,
                             ReadableInstant end,
                             DurationFieldType field)
Calculates the number of whole units between the two specified datetimes.

Parameters:
start - the start instant, validated to not be null
end - the end instant, validated to not be null
field - the field type to use, must not be null
Returns:
the period
Throws:
IllegalArgumentException - if the instants are null or invalid

between

protected static int between(ReadablePartial start,
                             ReadablePartial end,
                             ReadablePeriod zeroInstance)
Calculates the number of whole units between the two specified partial datetimes.

The two partials must contain the same fields, for example you can specify two LocalDate objects.

Parameters:
start - the start partial date, validated to not be null
end - the end partial date, validated to not be null
zeroInstance - the zero instance constant, must not be null
Returns:
the period
Throws:
IllegalArgumentException - if the partials are null or invalid

standardPeriodIn

protected static int standardPeriodIn(ReadablePeriod period,
                                      long millisPerUnit)
Creates a new instance representing the number of complete standard length units in the specified period.

This factory method converts all fields from the period to hours using standardised durations for each field. Only those fields which have a precise duration in the ISO UTC chronology can be converted.

Months and Years are imprecise and periods containing these values cannot be converted.

Parameters:
period - the period to get the number of hours from, must not be null
millisPerUnit - the number of milliseconds in one standard unit of this period
Throws:
IllegalArgumentException - if the period contains imprecise duration values

getValue

protected int getValue()
Gets the amount of this period.

Returns:
the period value

setValue

protected void setValue(int value)
Sets the amount of this period. To make a subclass immutable you must declare it final, or block this method.

Parameters:
value - the period value

getFieldType

public abstract DurationFieldType getFieldType()
Gets the single duration field type.

Returns:
the duration field type, not null

getPeriodType

public abstract PeriodType getPeriodType()
Gets the period type which matches the duration field type.

Specified by:
getPeriodType in interface ReadablePeriod
Returns:
the period type, not null

size

public int size()
Gets the number of fields that this period supports, which is one.

Specified by:
size in interface ReadablePeriod
Returns:
the number of fields supported, which is one

getFieldType

public DurationFieldType getFieldType(int index)
Gets the field type at the specified index.

The only index supported by this period is zero which returns the field type of this class.

Specified by:
getFieldType in interface ReadablePeriod
Parameters:
index - the index to retrieve, which must be zero
Returns:
the field at the specified index
Throws:
IndexOutOfBoundsException - if the index is invalid

getValue

public int getValue(int index)
Gets the value at the specified index.

The only index supported by this period is zero.

Specified by:
getValue in interface ReadablePeriod
Parameters:
index - the index to retrieve, which must be zero
Returns:
the value of the field at the specified index
Throws:
IndexOutOfBoundsException - if the index is invalid

get

public int get(DurationFieldType type)
Gets the value of a duration field represented by this period.

If the field type specified does not match the type used by this class then zero is returned.

Specified by:
get in interface ReadablePeriod
Parameters:
type - the field type to query, null returns zero
Returns:
the value of that field, zero if field not supported

isSupported

public boolean isSupported(DurationFieldType type)
Checks whether the duration field specified is supported by this period.

Specified by:
isSupported in interface ReadablePeriod
Parameters:
type - the type to check, may be null which returns false
Returns:
true if the field is supported

toPeriod

public Period toPeriod()
Get this period as an immutable Period object. The period will use PeriodType.standard().

Specified by:
toPeriod in interface ReadablePeriod
Returns:
a Period representing the same number of days

toMutablePeriod

public MutablePeriod toMutablePeriod()
Get this object as a MutablePeriod.

This will always return a new MutablePeriod with the same fields. The period will use PeriodType.standard().

Specified by:
toMutablePeriod in interface ReadablePeriod
Returns:
a MutablePeriod using the same field set and values

equals

public boolean equals(Object period)
Compares this object with the specified object for equality based on the value of each field. All ReadablePeriod instances are accepted, but only those with a matching PeriodType can return true.

Specified by:
equals in interface ReadablePeriod
Overrides:
equals in class Object
Parameters:
period - a readable period to check against
Returns:
true if all the field values are equal, false if not or the period is null or of an incorrect type

hashCode

public int hashCode()
Gets a hash code for the period as defined by ReadablePeriod.

Specified by:
hashCode in interface ReadablePeriod
Overrides:
hashCode in class Object
Returns:
a hash code

compareTo

public int compareTo(BaseSingleFieldPeriod other)
Compares this period to another object of the same class.

Specified by:
compareTo in interface Comparable<BaseSingleFieldPeriod>
Parameters:
other - the other period, must not be null
Returns:
zero if equal, positive if greater, negative if less
Throws:
NullPointerException - if the other period is null
ClassCastException - if the other period is of a different type


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