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https://issues.apache.org/jira/browse/LANG-379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12563403#action_12563403
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Henri Yandell commented on LANG-379:
------------------------------------
Looks good - still needs code examples in the javadoc.
I think this is going to be something that people understand easily when they
see the code, and are confused by when they just read the description.
If possible, just upload the patch for the DateUtils file as I've reworked the
Test file a bit already.
> Calculating A date fragment in any time-unit
> --------------------------------------------
>
> Key: LANG-379
> URL: https://issues.apache.org/jira/browse/LANG-379
> Project: Commons Lang
> Issue Type: New Feature
> Affects Versions: 2.3
> Reporter: Robert Scholte
> Priority: Minor
> Fix For: 2.4
>
> Attachments: DateUtils.patch, DateUtilsFragmentTest.java
>
>
> These DateUtils-features can make it possible to calculate a date-part in any
> time-unit. For example: the number of minutes of this year, the number of
> seconds of today, etc.
> I've started with some coding, and if there's enough interest we can make it
> more solid.
> public static long getFragmentInSeconds(Date date, int fragment) {
> return getFragment(date, fragment, Calendar.SECOND);
> }
>
> public static long getFragmentInMinutes(Date date, int fragment) {
> return getFragment(date, fragment, Calendar.MINUTE);
> }
>
> public static long getFragmentInHours(Date date, int fragment) {
> return getFragment(date, fragment, Calendar.HOUR_OF_DAY);
> }
>
> public static long getFragmentInDays(Date date, int fragment) {
> return getFragment(date, fragment, Calendar.DAY_OF_YEAR);
> }
> public static long getFragmentInSeconds(Calendar calendar, int
> fragment) {
> return getFragment(calendar, fragment, Calendar.SECOND);
> }
>
> public static long getFragmentInMinutes(Calendar calendar, int
> fragment) {
> return getFragment(calendar, fragment, Calendar.MINUTE);
> }
>
> public static long getFragmentInHours(Calendar calendar, int fragment) {
> return getFragment(calendar, fragment, Calendar.HOUR_OF_DAY);
> }
>
> public static long getFragmentInDays(Calendar calendar, int fragment) {
> return getFragment(calendar, fragment, Calendar.DAY_OF_YEAR);
> }
>
> private static long getFragment(Date date, int fragment, int unit) {
> Calendar calendar = Calendar.getInstance();
> calendar.setTime(date);
> return getFragment(calendar, fragment, unit);
> }
> private static long getFragment(Calendar calendar, int fragment, int
> unit) {
> long millisPerUnit = getMillisPerFragment(unit);
> long result = 0;
> switch (fragment) {
> case Calendar.YEAR:
> result += (calendar.get(Calendar.DAY_OF_YEAR) *
> MILLIS_PER_DAY) / millisPerUnit;
> case Calendar.MONTH:
> result += (calendar.get(Calendar.DAY_OF_MONTH) *
> MILLIS_PER_DAY) / millisPerUnit;
> case Calendar.DAY_OF_YEAR:
> case Calendar.DATE:
> result += (calendar.get(Calendar.HOUR_OF_DAY) *
> MILLIS_PER_HOUR) / millisPerUnit;
> case Calendar.HOUR_OF_DAY:
> result += (calendar.get(Calendar.MINUTE) *
> MILLIS_PER_MINUTE) / millisPerUnit;
> case Calendar.MINUTE:
> result += (calendar.get(Calendar.SECOND) *
> MILLIS_PER_SECOND) / millisPerUnit;
> case Calendar.SECOND:
> result += (calendar.get(Calendar.MILLISECOND) * 1) /
> millisPerUnit;
> }
> return result;
> }
>
> private static long getMillisPerFragment(int fragment) {
> long result = Long.MAX_VALUE;
> switch (fragment) {
> case Calendar.DAY_OF_YEAR:
> case Calendar.DATE:
> result = MILLIS_PER_DAY;
> break;
> case Calendar.HOUR_OF_DAY:
> result = MILLIS_PER_HOUR;
> break;
> case Calendar.MINUTE:
> result = MILLIS_PER_MINUTE;
> break;
> case Calendar.SECOND:
> result = MILLIS_PER_SECOND;
> break;
> case Calendar.MILLISECOND:
> result = 1;
> break;
> }
> return result;
> }
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