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169 changes: 169 additions & 0 deletions
169
sitebricks/src/main/java/com/google/sitebricks/util/MailDateFormat.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,169 @@ | ||
| package com.google.sitebricks.util; | ||
|
|
||
| import java.io.PrintStream; | ||
| import java.text.DecimalFormat; | ||
| import java.text.FieldPosition; | ||
| import java.text.NumberFormat; | ||
| import java.text.ParsePosition; | ||
| import java.text.SimpleDateFormat; | ||
| import java.util.Calendar; | ||
| import java.util.Date; | ||
| import java.util.GregorianCalendar; | ||
| import java.util.TimeZone; | ||
|
|
||
| /** | ||
| * A modification of the GNU implementation to keep the timezone component in | ||
| * parsing mail date formats. | ||
| * | ||
| */ | ||
| public class MailDateFormat { | ||
| private static final String[] MONTHS = { | ||
| "Jan", "Feb", "Mar", "Apr", "May", "Jun", | ||
| "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" | ||
| }; | ||
|
|
||
| /** | ||
| * Parses the given date in the format specified by | ||
| * draft-ietf-drums-msg-fmt-08 in the current TimeZone. | ||
| * @param text the formatted date to be parsed | ||
| */ | ||
| public static GregorianCalendar parse(String text) | ||
| { | ||
| int start = 0, end = -1; | ||
| int len = text.length(); | ||
| GregorianCalendar calendar = new GregorianCalendar(TimeZone.getTimeZone("GMT")); | ||
| calendar.clear(); | ||
| ParsePosition pos = new ParsePosition(start); | ||
| try | ||
| { | ||
| // Advance to date | ||
| if (Character.isLetter(text.charAt(start))) | ||
| { | ||
| start = skipNonWhitespace(text, start, len); | ||
| } | ||
| start = skipWhitespace(text, start, len); | ||
| pos.setIndex(start); | ||
| end = skipNonWhitespace(text, start + 1, len); | ||
| int date = Integer.parseInt(text.substring(start, end)); | ||
| // Advance to month | ||
| start = skipWhitespace(text, end + 1, len); | ||
| pos.setIndex(start); | ||
| end = skipNonWhitespace(text, start + 1, len); | ||
| String monthText = text.substring(start, end); | ||
| int month = -1; | ||
| for (int i = 0; i < 12; i++) | ||
| { | ||
| if (MONTHS[i].equals(monthText)) | ||
| { | ||
| month = i; | ||
| break; | ||
| } | ||
| } | ||
| if (month == -1) | ||
| { | ||
| pos.setErrorIndex(end); | ||
| return null; | ||
| } | ||
| // Advance to year | ||
| start = skipWhitespace(text, end + 1, len); | ||
| pos.setIndex(start); | ||
| end = skipNonWhitespace(text, start + 1, len); | ||
| int year = Integer.parseInt(text.substring(start, end)); | ||
| calendar.set(Calendar.YEAR, year); | ||
| calendar.set(Calendar.MONTH, month); | ||
| calendar.set(Calendar.DAY_OF_MONTH, date); | ||
| // Advance to hour | ||
| start = skipWhitespace(text, end + 1, len); | ||
| pos.setIndex(start); | ||
| end = skipToColon(text, start + 1, len); | ||
| int hour = Integer.parseInt(text.substring(start, end)); | ||
| calendar.set(Calendar.HOUR, hour); | ||
| // Advance to minute | ||
| start = end + 1; | ||
| pos.setIndex(start); | ||
| end = skipToColon(text, start + 1, len); | ||
| int minute = Integer.parseInt(text.substring(start, end)); | ||
| calendar.set(Calendar.MINUTE, minute); | ||
| // Advance to second | ||
| start = end + 1; | ||
| pos.setIndex(start); | ||
| end = skipNonWhitespace(text, start + 1, len); | ||
| int second = Integer.parseInt(text.substring(start, end)); | ||
| calendar.set(Calendar.SECOND, second); | ||
|
|
||
| if (end != len) | ||
| { | ||
| start = skipWhitespace(text, end + 1, len); | ||
| if (start != len) | ||
| { | ||
| // Trailing characters, therefore timezone | ||
| end = skipNonWhitespace(text, start + 1, len); | ||
| char pm = text.charAt(start); | ||
| if (Character.isLetter(pm)) | ||
| { | ||
| TimeZone tz = | ||
| TimeZone.getTimeZone(text.substring(start, end)); | ||
| calendar.set(Calendar.ZONE_OFFSET, tz.getRawOffset()); | ||
| } | ||
| else | ||
| { | ||
| int zoneOffset = 0; | ||
| zoneOffset += | ||
| 600 * Character.digit(text.charAt(++start), 10); | ||
| zoneOffset += | ||
| 60 * Character.digit(text.charAt(++start), 10); | ||
| zoneOffset += | ||
| 10 * Character.digit(text.charAt(++start), 10); | ||
| zoneOffset += | ||
| Character.digit(text.charAt(++start), 10); | ||
| zoneOffset *= 60000; // minutes -> ms | ||
| if ('-' == pm) | ||
| { | ||
| zoneOffset = -zoneOffset; | ||
| } | ||
| calendar.set(Calendar.ZONE_OFFSET, zoneOffset); | ||
| } | ||
| } | ||
| } | ||
| pos.setIndex(end); | ||
|
|
||
| return calendar; | ||
| } | ||
| catch (NumberFormatException e) | ||
| { | ||
| pos.setErrorIndex(Math.max(start, end)); | ||
| } | ||
| catch (StringIndexOutOfBoundsException e) | ||
| { | ||
| pos.setErrorIndex(Math.max(start, end)); | ||
| } | ||
| return null; | ||
| } | ||
|
|
||
| private static int skipWhitespace(final String text, int pos, final int len) | ||
| { | ||
| while (pos < len && Character.isWhitespace(text.charAt(pos))) | ||
| { | ||
| pos++; | ||
| } | ||
| return pos; | ||
| } | ||
|
|
||
| private static int skipNonWhitespace(final String text, int pos, final int len) | ||
| { | ||
| while (pos < len && !Character.isWhitespace(text.charAt(pos))) | ||
| { | ||
| pos++; | ||
| } | ||
| return pos; | ||
| } | ||
|
|
||
| private static int skipToColon(final String text, int pos, final int len) | ||
| { | ||
| while (pos < len && text.charAt(pos) != ':') | ||
| { | ||
| pos++; | ||
| } | ||
| return pos; | ||
| } | ||
| } |