311 lines
7.0 KiB
Java
311 lines
7.0 KiB
Java
// ChoiceFormat.java - Formatter for `switch'-like string substitution.
|
|
|
|
/* Copyright (C) 1999 Free Software Foundation
|
|
|
|
This file is part of libgcj.
|
|
|
|
This software is copyrighted work licensed under the terms of the
|
|
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
|
|
details. */
|
|
|
|
package java.text;
|
|
|
|
import java.util.Vector;
|
|
|
|
/**
|
|
* @author Tom Tromey <tromey@cygnus.com>
|
|
* @date March 9, 1999
|
|
*/
|
|
/* Written using "Java Class Libraries", 2nd edition, plus online
|
|
* API docs for JDK 1.2 from http://www.javasoft.com.
|
|
* Status: Believed complete and correct to 1.1.
|
|
*/
|
|
|
|
public class ChoiceFormat extends NumberFormat
|
|
{
|
|
// Note: we assume the same kind of quoting rules apply here.
|
|
// This isn't explicitly documented. But for instance we accept
|
|
// '#' as a literal hash in a format string.
|
|
public void applyPattern (String newPattern)
|
|
{
|
|
int index = 0, max = newPattern.length();
|
|
Vector stringVec = new Vector ();
|
|
Vector limitVec = new Vector ();
|
|
StringBuffer buf = new StringBuffer ();
|
|
|
|
while (true)
|
|
{
|
|
// Find end of double.
|
|
int dstart = index;
|
|
while (index < max)
|
|
{
|
|
char c = newPattern.charAt(index);
|
|
if (c == '#' || c == '\u2064' || c == '<')
|
|
break;
|
|
++index;
|
|
}
|
|
|
|
if (index == max)
|
|
throw new IllegalArgumentException ("unexpected end of text");
|
|
Double d = new Double (newPattern.substring(dstart, index));
|
|
|
|
if (newPattern.charAt(index) == '<')
|
|
d = new Double (nextDouble (d.doubleValue()));
|
|
|
|
limitVec.addElement(d);
|
|
|
|
// Scan text.
|
|
++index;
|
|
buf.setLength(0);
|
|
while (index < max)
|
|
{
|
|
char c = newPattern.charAt(index);
|
|
if (c == '\'' && index < max + 1
|
|
&& newPattern.charAt(index + 1) == '\'')
|
|
{
|
|
buf.append(c);
|
|
++index;
|
|
}
|
|
else if (c == '\'' && index < max + 2)
|
|
{
|
|
buf.append(newPattern.charAt(index + 1));
|
|
index += 2;
|
|
}
|
|
else if (c == '|')
|
|
break;
|
|
else
|
|
buf.append(c);
|
|
++index;
|
|
}
|
|
|
|
stringVec.addElement(buf.toString());
|
|
if (index == max)
|
|
break;
|
|
++index;
|
|
}
|
|
|
|
strings = new String[stringVec.size()];
|
|
stringVec.copyInto(strings);
|
|
|
|
limits = new double[limitVec.size()];
|
|
for (int i = 0; i < limits.length; ++i)
|
|
{
|
|
Double d = (Double) limitVec.elementAt(i);
|
|
limits[i] = d.doubleValue();
|
|
}
|
|
}
|
|
|
|
public ChoiceFormat (String newPattern)
|
|
{
|
|
super ();
|
|
applyPattern (newPattern);
|
|
}
|
|
|
|
public ChoiceFormat (double[] limits, String[] strings)
|
|
{
|
|
super ();
|
|
setChoices (limits, strings);
|
|
}
|
|
|
|
public Object clone ()
|
|
{
|
|
return new ChoiceFormat (limits, strings);
|
|
}
|
|
|
|
public boolean equals (Object obj)
|
|
{
|
|
if (! (obj instanceof ChoiceFormat))
|
|
return false;
|
|
ChoiceFormat cf = (ChoiceFormat) obj;
|
|
if (limits.length != cf.limits.length)
|
|
return false;
|
|
for (int i = limits.length - 1; i >= 0; --i)
|
|
{
|
|
if (limits[i] != cf.limits[i]
|
|
|| !strings[i].equals(cf.strings[i]))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
public StringBuffer format (long num, StringBuffer appendBuf,
|
|
FieldPosition pos)
|
|
{
|
|
return format ((double) num, appendBuf, pos);
|
|
}
|
|
|
|
public StringBuffer format (double num, StringBuffer appendBuf,
|
|
FieldPosition pos)
|
|
{
|
|
if (limits.length == 0)
|
|
return appendBuf;
|
|
|
|
int index = 0;
|
|
if (! Double.isNaN(num) && num >= limits[0])
|
|
{
|
|
for (; index < limits.length - 1; ++index)
|
|
{
|
|
if (limits[index] <= num
|
|
&& index != limits.length - 2
|
|
&& num < limits[index + 1])
|
|
break;
|
|
}
|
|
}
|
|
|
|
return appendBuf.append(strings[index]);
|
|
}
|
|
|
|
public Object[] getFormats ()
|
|
{
|
|
return (Object[]) strings.clone();
|
|
}
|
|
|
|
public double[] getLimits ()
|
|
{
|
|
return (double[]) limits.clone();
|
|
}
|
|
|
|
public int hashCode ()
|
|
{
|
|
int hash = 0;
|
|
for (int i = 0; i < limits.length; ++i)
|
|
{
|
|
long v = Double.doubleToLongBits(limits[i]);
|
|
hash ^= (v ^ (v >>> 32));
|
|
hash ^= strings[i].hashCode();
|
|
}
|
|
return hash;
|
|
}
|
|
|
|
public static final double nextDouble (double d)
|
|
{
|
|
return nextDouble (d, true);
|
|
}
|
|
|
|
public static double nextDouble (double d, boolean next)
|
|
{
|
|
if (Double.isInfinite(d) || Double.isNaN(d))
|
|
return d;
|
|
|
|
long bits = Double.doubleToLongBits(d);
|
|
|
|
long mantMask = (1L << mantissaBits) - 1;
|
|
long mantissa = bits & mantMask;
|
|
|
|
long expMask = (1L << exponentBits) - 1;
|
|
long exponent = (bits >>> mantissaBits) & expMask;
|
|
|
|
if (next ^ (bits < 0)) // Increment magnitude
|
|
{
|
|
if (mantissa == (1L << mantissaBits) - 1)
|
|
{
|
|
mantissa = 0L;
|
|
exponent++;
|
|
|
|
// Check for absolute overflow.
|
|
if (exponent >= (1L << mantissaBits))
|
|
return (bits > 0) ? Double.POSITIVE_INFINITY
|
|
: Double.NEGATIVE_INFINITY;
|
|
}
|
|
else
|
|
mantissa++;
|
|
}
|
|
else // Decrement magnitude
|
|
{
|
|
if (exponent == 0L && mantissa == 0L)
|
|
{
|
|
// The only case where there is a change of sign
|
|
return next ? Double.MIN_VALUE : -Double.MIN_VALUE;
|
|
}
|
|
else
|
|
{
|
|
if (mantissa == 0L)
|
|
{
|
|
mantissa = (1L << mantissaBits) - 1;
|
|
exponent--;
|
|
}
|
|
else
|
|
mantissa--;
|
|
}
|
|
}
|
|
|
|
long result = bits < 0 ? 1 : 0;
|
|
result = (result << exponentBits) | exponent;
|
|
result = (result << mantissaBits) | mantissa;
|
|
return Double.longBitsToDouble(result);
|
|
}
|
|
|
|
public Number parse (String sourceStr, ParsePosition pos)
|
|
{
|
|
int index = pos.getIndex();
|
|
for (int i = 0; i < limits.length; ++i)
|
|
{
|
|
if (sourceStr.startsWith(strings[i], index))
|
|
{
|
|
pos.setIndex(index + strings[i].length());
|
|
return new Double (limits[i]);
|
|
}
|
|
}
|
|
pos.setErrorIndex(index);
|
|
return new Double (Double.NaN);
|
|
}
|
|
|
|
public static final double previousDouble (double d)
|
|
{
|
|
return nextDouble (d, false);
|
|
}
|
|
|
|
public void setChoices (double[] limits, String[] strings)
|
|
{
|
|
if (limits == null || strings == null)
|
|
throw new NullPointerException ();
|
|
if (limits.length != strings.length)
|
|
throw new IllegalArgumentException ();
|
|
this.strings = (String[]) strings.clone();
|
|
this.limits = (double[]) limits.clone();
|
|
}
|
|
|
|
private final void quoteString (StringBuffer dest, String text)
|
|
{
|
|
int max = text.length();
|
|
for (int i = 0; i < max; ++i)
|
|
{
|
|
char c = text.charAt(i);
|
|
if (c == '\'')
|
|
{
|
|
dest.append(c);
|
|
dest.append(c);
|
|
}
|
|
else if (c == '#' || c == '|' || c == '\u2064' || c == '<')
|
|
{
|
|
dest.append('\'');
|
|
dest.append(c);
|
|
dest.append('\'');
|
|
}
|
|
else
|
|
dest.append(c);
|
|
}
|
|
}
|
|
|
|
public String toPattern ()
|
|
{
|
|
StringBuffer result = new StringBuffer ();
|
|
for (int i = 0; i < limits.length; ++i)
|
|
{
|
|
result.append(limits[i]);
|
|
result.append('#');
|
|
quoteString (result, strings[i]);
|
|
}
|
|
return result.toString();
|
|
}
|
|
|
|
// Formats and limits.
|
|
private String[] strings;
|
|
private double[] limits;
|
|
|
|
// Number of mantissa bits in double.
|
|
private static final int mantissaBits = 52;
|
|
// Number of exponent bits in a double.
|
|
private static final int exponentBits = 11;
|
|
}
|