Example usage for org.joda.time DurationField getType

Introduction

In this page you can find the example usage for org.joda.time DurationField getType.

Prototype

public abstract DurationFieldType getType();

Source Link

Document

Get the type of the field.

Usage

From source file:com.facebook.util.TimeIntervalType.java

License:Apache License

/**
 * Gets the start instant given the event instant, interval length 
 * and the time zone for this interval type.
 * /*from www  .ja  va2s.c o m*/
 * @param instant the event time instant.
 * @param length the interval length
 * 
 * @return the start instant of the interval of given length that contains 
 * the supplied time instant in the supplied time zone 
 */
public DateTime getTimeIntervalStart(DateTime instant, long length) {
    validateValue(instant.getZone(), length);
    // Get the time in the specified timezone
    DateTime periodStart = instant;
    // Clear all the fields for this intervalType and its subtypes
    TimeIntervalType timeIntervalType = this;
    while (timeIntervalType != null) {
        periodStart = timeIntervalType.clearField(periodStart);
        timeIntervalType = timeIntervalType.subType;
    }
    // figure out the which time interval does the instant lie in
    Period period = new Period(periodStart, instant, periodType);
    DurationField durationField = fieldType.getField(instant.getChronology()).getDurationField();
    int diff = period.get(durationField.getType());
    long startDelta = (diff / length) * length;
    return periodStart.withFieldAdded(durationField.getType(), FieldUtils.safeToInt(startDelta));
}

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