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523 lines
13 KiB
Java
523 lines
13 KiB
Java
/* Copyright (C) 1998, 1999 Cygnus Solutions
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.text;
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import java.util.*;
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/**
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* @author Per Bothner <bothner@cygnus.com>
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* @date October 25, 1998.
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*/
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/* Written using "Java Class Libraries", 2nd edition, plus online
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* API docs for JDK 1.2 beta from http://www.javasoft.com.
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* Status: parse is not implemented.
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*/
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public class SimpleDateFormat extends DateFormat
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{
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private Date defaultCenturyStart;
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private DateFormatSymbols formatData;
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private String pattern;
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public SimpleDateFormat ()
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{
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this("dd/MM/yy HH:mm", Locale.getDefault());
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}
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public SimpleDateFormat (String pattern)
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{
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this(pattern, Locale.getDefault());
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}
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public SimpleDateFormat (String pattern, Locale locale)
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{
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this.pattern = pattern;
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this.calendar = Calendar.getInstance(locale);
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this.numberFormat = NumberFormat.getInstance(locale);
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numberFormat.setGroupingUsed(false);
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this.formatData = new DateFormatSymbols (locale);
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}
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public SimpleDateFormat (String pattern, DateFormatSymbols formatData)
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{
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this.pattern = pattern;
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this.formatData = formatData;
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this.calendar = Calendar.getInstance();
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this.numberFormat = NumberFormat.getInstance();
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numberFormat.setGroupingUsed(false);
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}
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public Date get2DigitYearStart()
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{
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return defaultCenturyStart;
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}
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public void set2DigitYearStart(Date startDate)
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{
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defaultCenturyStart = startDate;
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}
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public DateFormatSymbols getDateFormatSymbols ()
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{
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return formatData;
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}
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public void setDateFormatSymbols (DateFormatSymbols value)
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{
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formatData = value;
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}
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public String toPattern ()
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{
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return pattern;
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}
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public void applyPattern (String pattern)
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{
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this.pattern = pattern;
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}
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private String applyLocalizedPattern (String pattern,
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String oldChars, String newChars)
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{
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int len = pattern.length();
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StringBuffer buf = new StringBuffer(len);
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boolean quoted = false;
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for (int i = 0; i < len; i++)
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{
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char ch = pattern.charAt(i);
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if (ch == '\'')
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quoted = ! quoted;
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if (! quoted)
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{
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int j = oldChars.indexOf(ch);
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if (j >= 0)
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ch = newChars.charAt(j);
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}
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buf.append(ch);
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}
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return buf.toString();
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}
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public void applyLocalizedPattern (String pattern)
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{
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String localChars = formatData.getLocalPatternChars();
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String standardChars = DateFormatSymbols.localPatternCharsDefault;
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pattern = applyLocalizedPattern (pattern, localChars, standardChars);
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applyPattern(pattern);
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}
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public String toLocalizedPattern ()
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{
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String localChars = formatData.getLocalPatternChars();
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String standardChars = DateFormatSymbols.localPatternCharsDefault;
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return applyLocalizedPattern (pattern, standardChars, localChars);
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}
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private final void append (StringBuffer buf, int value, int numDigits)
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{
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numberFormat.setMinimumIntegerDigits(numDigits);
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numberFormat.format(value, buf, null);
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}
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public StringBuffer format (Date date, StringBuffer buf, FieldPosition pos)
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{
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Calendar calendar = (Calendar) this.calendar.clone();
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calendar.setTime(date);
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int len = pattern.length();
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int quoteStart = -1;
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for (int i = 0; i < len; i++)
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{
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char ch = pattern.charAt(i);
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if (ch == '\'')
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{
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// We must do a little lookahead to see if we have two
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// single quotes embedded in quoted text.
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if (i < len - 1 && pattern.charAt(i + 1) == '\'')
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{
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++i;
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buf.append(ch);
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}
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else
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quoteStart = quoteStart < 0 ? i : -1;
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}
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// From JCL: any characters in the pattern that are not in
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// the ranges of [a..z] and [A..Z] are treated as quoted
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// text.
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else if (quoteStart != -1
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|| ((ch < 'a' || ch > 'z')
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&& (ch < 'A' || ch > 'Z')))
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buf.append(ch);
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else
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{
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int first = i;
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int value;
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while (++i < len && pattern.charAt(i) == ch) ;
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int count = i - first; // Number of repetions of ch in pattern.
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int beginIndex = buf.length();
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int field;
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i--; // Skip all but last instance of ch in pattern.
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switch (ch)
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{
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case 'd':
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append(buf, calendar.get(Calendar.DATE), count);
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field = DateFormat.DATE_FIELD;
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break;
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case 'D':
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append(buf, calendar.get(Calendar.DAY_OF_YEAR), count);
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field = DateFormat.DAY_OF_YEAR_FIELD;
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break;
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case 'F':
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append(buf, calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH),count);
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field = DateFormat.DAY_OF_WEEK_IN_MONTH_FIELD;
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break;
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case 'E':
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value = calendar.get(calendar.DAY_OF_WEEK);
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buf.append(count <= 3 ? formatData.getShortWeekdays()[value]
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: formatData.getWeekdays()[value]);
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field = DateFormat.DAY_OF_WEEK_FIELD;
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break;
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case 'w':
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append(buf, calendar.get(Calendar.WEEK_OF_YEAR), count);
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field = DateFormat.WEEK_OF_YEAR_FIELD;
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break;
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case 'W':
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append(buf, calendar.get(Calendar.WEEK_OF_MONTH), count);
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field = DateFormat.WEEK_OF_MONTH_FIELD;
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break;
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case 'M':
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value = calendar.get(Calendar.MONTH);
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if (count <= 2)
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append(buf, value + 1, count);
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else
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buf.append(count <= 3 ? formatData.getShortMonths()[value]
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: formatData.getMonths()[value]);
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field = DateFormat.MONTH_FIELD;
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break;
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case 'y':
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value = calendar.get(Calendar.YEAR);
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append(buf, count <= 2 ? value % 100 : value, count);
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field = DateFormat.YEAR_FIELD;
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break;
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case 'K':
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append(buf, calendar.get(Calendar.HOUR), count);
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field = DateFormat.HOUR0_FIELD;
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break;
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case 'h':
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value = ((calendar.get(Calendar.HOUR) + 11) % 12) + 1;
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append(buf, value, count);
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field = DateFormat.HOUR1_FIELD;
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break;
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case 'H':
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append(buf, calendar.get(Calendar.HOUR_OF_DAY), count);
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field = DateFormat.HOUR_OF_DAY0_FIELD;
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break;
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case 'k':
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value = ((calendar.get(Calendar.HOUR_OF_DAY) + 23) % 24) + 1;
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append(buf, value, count);
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field = DateFormat.HOUR_OF_DAY1_FIELD;
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break;
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case 'm':
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append(buf, calendar.get(Calendar.MINUTE), count);
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field = DateFormat.MINUTE_FIELD;
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break;
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case 's':
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append(buf, calendar.get(Calendar.SECOND), count);
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field = DateFormat.SECOND_FIELD;
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break;
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case 'S':
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append(buf, calendar.get(Calendar.MILLISECOND), count);
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field = DateFormat.MILLISECOND_FIELD;
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break;
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case 'a':
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value = calendar.get(calendar.AM_PM);
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buf.append(formatData.getAmPmStrings()[value]);
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field = DateFormat.AM_PM_FIELD;
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break;
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case 'z':
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String zoneID = calendar.getTimeZone().getID();
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String[][] zoneStrings = formatData.getZoneStrings();
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int zoneCount = zoneStrings.length;
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for (int j = 0; j < zoneCount; j++)
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{
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String[] strings = zoneStrings[j];
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if (zoneID.equals(strings[0]))
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{
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j = count > 3 ? 2 : 1;
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if (calendar.get(Calendar.DST_OFFSET) != 0)
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j+=2;
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zoneID = strings[j];
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break;
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}
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}
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buf.append(zoneID);
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field = DateFormat.TIMEZONE_FIELD;
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break;
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default:
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// Note that the JCL is actually somewhat
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// contradictory here. It defines the pattern letters
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// to be a particular list, but also says that a
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// pattern containing an invalid pattern letter must
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// throw an exception. It doesn't describe what an
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// invalid pattern letter might be, so we just assume
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// it is any letter in [a-zA-Z] not explicitly covered
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// above.
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throw new RuntimeException("bad format string");
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}
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if (pos != null && field == pos.getField())
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{
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pos.setBeginIndex(beginIndex);
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pos.setEndIndex(buf.length());
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}
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}
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}
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return buf;
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}
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private final boolean expect (String source, ParsePosition pos,
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char ch)
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{
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int x = pos.getIndex();
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boolean r = x < source.length() && source.charAt(x) == ch;
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if (r)
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pos.setIndex(x + 1);
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else
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pos.setErrorIndex(x);
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return r;
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}
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public Date parse (String source, ParsePosition pos)
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{
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int fmt_index = 0;
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int fmt_max = pattern.length();
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calendar.clear();
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int quote_start = -1;
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for (; fmt_index < fmt_max; ++fmt_index)
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{
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char ch = pattern.charAt(fmt_index);
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if (ch == '\'')
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{
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int index = pos.getIndex();
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if (fmt_index < fmt_max - 1
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&& pattern.charAt(fmt_index + 1) == '\'')
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{
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if (! expect (source, pos, ch))
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return null;
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++fmt_index;
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}
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else
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quote_start = quote_start < 0 ? fmt_index : -1;
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continue;
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}
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if (quote_start != -1
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|| ((ch < 'a' || ch > 'z')
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&& (ch < 'A' || ch > 'Z')))
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{
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if (! expect (source, pos, ch))
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return null;
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continue;
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}
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// We've arrived at a potential pattern character in the
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// pattern.
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int first = fmt_index;
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while (++fmt_index < fmt_max && pattern.charAt(fmt_index) == ch)
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;
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int count = fmt_index - first;
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--fmt_index;
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// We can handle most fields automatically: most either are
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// numeric or are looked up in a string vector. In some cases
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// we need an offset. When numeric, `offset' is added to the
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// resulting value. When doing a string lookup, offset is the
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// initial index into the string array.
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int calendar_field;
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boolean is_numeric = true;
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String[] match = null;
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int offset = 0;
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int zone_number = 0;
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switch (ch)
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{
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case 'd':
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calendar_field = Calendar.DATE;
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break;
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case 'D':
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calendar_field = Calendar.DAY_OF_YEAR;
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break;
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case 'F':
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calendar_field = Calendar.DAY_OF_WEEK_IN_MONTH;
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break;
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case 'E':
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is_numeric = false;
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offset = 1;
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calendar_field = Calendar.DAY_OF_WEEK;
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match = (count <= 3
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? formatData.getShortWeekdays()
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: formatData.getWeekdays());
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break;
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case 'w':
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calendar_field = Calendar.WEEK_OF_YEAR;
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break;
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case 'W':
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calendar_field = Calendar.WEEK_OF_MONTH;
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break;
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case 'M':
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calendar_field = Calendar.MONTH;
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if (count <= 2)
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;
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else
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{
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is_numeric = false;
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match = (count <= 3
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? formatData.getShortMonths()
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: formatData.getMonths());
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}
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break;
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case 'y':
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calendar_field = Calendar.YEAR;
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if (count <= 2)
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offset = 1900;
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break;
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case 'K':
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calendar_field = Calendar.HOUR;
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break;
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case 'h':
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calendar_field = Calendar.HOUR;
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offset = -1;
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break;
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case 'H':
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calendar_field = Calendar.HOUR_OF_DAY;
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break;
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case 'k':
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calendar_field = Calendar.HOUR_OF_DAY;
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offset = -1;
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break;
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case 'm':
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calendar_field = Calendar.MINUTE;
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break;
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case 's':
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calendar_field = Calendar.SECOND;
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break;
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case 'S':
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calendar_field = Calendar.MILLISECOND;
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break;
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case 'a':
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is_numeric = false;
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calendar_field = Calendar.AM_PM;
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match = formatData.getAmPmStrings();
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break;
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case 'z':
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// We need a special case for the timezone, because it
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// uses a different data structure than the other cases.
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is_numeric = false;
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calendar_field = Calendar.DST_OFFSET;
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String[][] zoneStrings = formatData.getZoneStrings();
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int zoneCount = zoneStrings.length;
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int index = pos.getIndex();
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boolean found_zone = false;
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for (int j = 0; j < zoneCount; j++)
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{
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String[] strings = zoneStrings[j];
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int k;
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for (k = 1; k < strings.length; ++k)
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{
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if (source.startsWith(strings[k], index))
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break;
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}
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if (k != strings.length)
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{
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if (k > 2)
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; // FIXME: dst.
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zone_number = 0; // FIXME: dst.
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// FIXME: raw offset to SimpleTimeZone const.
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calendar.setTimeZone(new SimpleTimeZone (1, strings[0]));
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pos.setIndex(index + strings[k].length());
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break;
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}
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}
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if (! found_zone)
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{
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pos.setErrorIndex(pos.getIndex());
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return null;
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}
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break;
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default:
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pos.setErrorIndex(pos.getIndex());
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return null;
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}
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// Compute the value we should assign to the field.
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int value;
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if (is_numeric)
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{
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numberFormat.setMinimumIntegerDigits(count);
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Number n = numberFormat.parse(source, pos);
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if (pos == null || ! (n instanceof Long))
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return null;
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value = n.intValue() + offset;
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}
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else if (match != null)
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{
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int index = pos.getIndex();
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int i;
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for (i = offset; i < match.length; ++i)
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{
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if (source.startsWith(match[i], index))
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break;
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}
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if (i == match.length)
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{
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pos.setErrorIndex(index);
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return null;
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}
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pos.setIndex(index + match[i].length());
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value = i;
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}
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else
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value = zone_number;
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// Assign the value and move on.
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try
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{
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calendar.set(calendar_field, value);
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}
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// FIXME: what exception is thrown on an invalid
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// non-lenient set?
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catch (IllegalArgumentException x)
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{
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pos.setErrorIndex(pos.getIndex());
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return null;
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}
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}
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return calendar.getTime();
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}
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public boolean equals (Object obj)
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{
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if (! (obj instanceof SimpleDateFormat) || ! super.equals(obj) )
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return false;
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SimpleDateFormat other = (SimpleDateFormat) obj;
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return (DateFormatSymbols.equals(pattern, other.pattern)
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&& DateFormatSymbols.equals(formatData, other.formatData)
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&& DateFormatSymbols.equals(defaultCenturyStart,
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other.defaultCenturyStart));
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}
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public int hashCode ()
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{
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int hash = super.hashCode();
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if (pattern != null)
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hash ^= pattern.hashCode();
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return hash;
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}
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}
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