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*
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*
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*
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/*
* (C) Copyright Taligent, Inc. 1996, 1997 - All Rights Reserved
* (C) Copyright IBM Corp. 1996 - 1998 - All Rights Reserved
*
* The original version of this source code and documentation is copyrighted
* and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These
* materials are provided under terms of a License Agreement between Taligent
* and Sun. This technology is protected by multiple US and International
* patents. This notice and attribution to Taligent may not be removed.
* Taligent is a registered trademark of Taligent, Inc.
*
*/
/**
* A <code>ChoiceFormat</code> allows you to attach a format to a range of numbers.
* It is generally used in a <code>MessageFormat</code> for handling plurals.
* The choice is specified with an ascending list of doubles, where each item
* specifies a half-open interval up to the next item:
* <blockquote>
* <pre>
* X matches j if and only if limit[j] <= X < limit[j+1]
* </pre>
* </blockquote>
* If there is no match, then either the first or last index is used, depending
* on whether the number (X) is too low or too high. If the limit array is not
* in ascending order, the results of formatting will be incorrect. ChoiceFormat
* also accepts <code>\u221E</code> as equivalent to infinity(INF).
*
* <p>
* <strong>Note:</strong>
* <code>ChoiceFormat</code> differs from the other <code>Format</code>
* classes in that you create a <code>ChoiceFormat</code> object with a
* constructor (not with a <code>getInstance</code> style factory
* method). The factory methods aren't necessary because <code>ChoiceFormat</code>
* doesn't require any complex setup for a given locale. In fact,
* <code>ChoiceFormat</code> doesn't implement any locale specific behavior.
*
* <p>
* When creating a <code>ChoiceFormat</code>, you must specify an array of formats
* and an array of limits. The length of these arrays must be the same.
* For example,
* <ul>
* <li>
* <em>limits</em> = {1,2,3,4,5,6,7}<br>
* <em>formats</em> = {"Sun","Mon","Tue","Wed","Thur","Fri","Sat"}
* <li>
* <em>limits</em> = {0, 1, ChoiceFormat.nextDouble(1)}<br>
* <em>formats</em> = {"no files", "one file", "many files"}<br>
* (<code>nextDouble</code> can be used to get the next higher double, to
* make the half-open interval.)
* </ul>
*
* <p>
* Here is a simple example that shows formatting and parsing:
* <blockquote>
* <pre>
* double[] limits = {1,2,3,4,5,6,7};
* String[] dayOfWeekNames = {"Sun","Mon","Tue","Wed","Thur","Fri","Sat"};
* ChoiceFormat form = new ChoiceFormat(limits, dayOfWeekNames);
* ParsePosition status = new ParsePosition(0);
* for (double i = 0.0; i <= 8.0; ++i) {
* status.setIndex(0);
* System.out.println(i + " -> " + form.format(i) + " -> "
* + form.parse(form.format(i),status));
* }
* </pre>
* </blockquote>
* Here is a more complex example, with a pattern format:
* <blockquote>
* <pre>
* double[] filelimits = {0,1,2};
* String[] filepart = {"are no files","is one file","are {2} files"};
* ChoiceFormat fileform = new ChoiceFormat(filelimits, filepart);
* Format[] testFormats = {fileform, null, NumberFormat.getInstance()};
* MessageFormat pattform = new MessageFormat("There {0} on {1}");
* pattform.setFormats(testFormats);
* Object[] testArgs = {null, "ADisk", null};
* for (int i = 0; i < 4; ++i) {
* testArgs[0] = new Integer(i);
* testArgs[2] = testArgs[0];
* System.out.println(pattform.format(testArgs));
* }
* </pre>
* </blockquote>
* <p>
* Specifying a pattern for ChoiceFormat objects is fairly straightforward.
* For example:
* <blockquote>
* <pre>
* ChoiceFormat fmt = new ChoiceFormat(
* "-1#is negative| 0#is zero or fraction | 1#is one |1.0<is 1+ |2#is two |2<is more than 2.");
* System.out.println("Formatter Pattern : " + fmt.toPattern());
*
* System.out.println("Format with -INF : " + fmt.format(Double.NEGATIVE_INFINITY));
* System.out.println("Format with -1.0 : " + fmt.format(-1.0));
* System.out.println("Format with 0 : " + fmt.format(0));
* System.out.println("Format with 0.9 : " + fmt.format(0.9));
* System.out.println("Format with 1.0 : " + fmt.format(1));
* System.out.println("Format with 1.5 : " + fmt.format(1.5));
* System.out.println("Format with 2 : " + fmt.format(2));
* System.out.println("Format with 2.1 : " + fmt.format(2.1));
* System.out.println("Format with NaN : " + fmt.format(Double.NaN));
* System.out.println("Format with +INF : " + fmt.format(Double.POSITIVE_INFINITY));
* </pre>
* </blockquote>
* And the output result would be like the following:
* <blockquote>
* <pre>
* Format with -INF : is negative
* Format with -1.0 : is negative
* Format with 0 : is zero or fraction
* Format with 0.9 : is zero or fraction
* Format with 1.0 : is one
* Format with 1.5 : is 1+
* Format with 2 : is two
* Format with 2.1 : is more than 2.
* Format with NaN : is negative
* Format with +INF : is more than 2.
* </pre>
* </blockquote>
*
* <h4><a name="synchronization">Synchronization</a></h4>
*
* <p>
* Choice formats are not synchronized.
* It is recommended to create separate format instances for each thread.
* If multiple threads access a format concurrently, it must be synchronized
* externally.
*
*
* @see DecimalFormat
* @see MessageFormat
* @author Mark Davis
*/
// Proclaim serial compatibility with 1.1 FCS
/**
* Sets the pattern.
* @param newPattern See the class description.
*/
segments[i] = new StringBuffer();
}
double[] newChoiceLimits = new double[30];
int count = 0;
int part = 0;
double startValue = 0;
boolean inQuote = false;
if (ch=='\'') {
// Check for "''" indicating a literal quote
++i;
} else {
}
} else if (inQuote) {
throw new IllegalArgumentException();
}
try {
} else {
}
} catch (Exception e) {
throw new IllegalArgumentException();
}
}
if (startValue <= oldStartValue) {
throw new IllegalArgumentException();
}
part = 1;
} else if (ch == '|') {
}
++count;
part = 0;
} else {
}
}
// clean up last one
if (part == 1) {
}
++count;
}
choiceLimits = new double[count];
}
/**
* Gets the pattern.
*/
if (i != 0) {
}
// choose based upon which has less precision
// approximate that by choosing the closest one to an integer.
// could do better, but it's not worth it.
if (tryLessOrEqual < tryLess) {
} else {
} else {
}
}
// Append choiceFormats[i], using quotes if there are special characters.
// Single quotes themselves must be escaped in either case.
else {
}
}
}
}
/**
* Constructs with limits and corresponding formats based on the pattern.
* @see #applyPattern
*/
}
/**
* Constructs with the limits and the corresponding formats.
* @see #setChoices
*/
}
/**
* Set the choices to be used in formatting.
* @param limits contains the top value that you want
* parsed with that format,and should be in ascending sorted order. When
* formatting X, the choice will be the i, where
* limit[i] <= X < limit[i+1].
* If the limit array is not in ascending order, the results of formatting
* will be incorrect.
* @param formats are the formats you want to use for each limit.
* They can be either Format objects or Strings.
* When formatting with object Y,
* if the object is a NumberFormat, then ((NumberFormat) Y).format(X)
* is called. Otherwise Y.toString() is called.
*/
throw new IllegalArgumentException(
"Array and limit arrays must be of the same length.");
}
}
/**
* Get the limits passed in the constructor.
* @return the limits.
*/
public double[] getLimits() {
return choiceLimits;
}
/**
* Get the formats passed in the constructor.
* @return the formats.
*/
return choiceFormats;
}
// Overrides
/**
* Specialization of format. This method really calls
* <code>format(double, StringBuffer, FieldPosition)</code>
* thus the range of longs that are supported is only equal to
* the range that can be stored by double. This will never be
* a practical limitation.
*/
}
/**
* Returns pattern with formatted double.
* @param number number to be formatted & substituted.
* @param toAppendTo where text is appended.
* @param status ignore no useful status is returned.
*/
// find the number
int i;
if (!(number >= choiceLimits[i])) {
// same as number < choiceLimits, except catchs NaN
break;
}
}
--i;
if (i < 0) i = 0;
// return either a formatted number, or a string
}
/**
* Parses a Number from the input text.
* @param text the source text.
* @param status an input-output parameter. On input, the
* status.index field indicates the first character of the
* source text that should be parsed. On exit, if no error
* occured, status.index is set to the first unparsed character
* in the source text. On exit, if an error did occur,
* status.index is unchanged and status.errorIndex is set to the
* first index of the character that caused the parse to fail.
* @return A Number representing the value of the number parsed.
*/
// find the best number (defined as the one with the longest parse)
double tempNumber = 0.0;
tempNumber = choiceLimits[i];
}
}
}
}
return new Double(bestNumber);
}
/**
* Finds the least double greater than d.
* If NaN, returns same value.
* <p>Used to make half-open intervals.
* @see #previousDouble
*/
public static final double nextDouble (double d) {
return nextDouble(d,true);
}
/**
* Finds the greatest double less than d.
* If NaN, returns same value.
* @see #nextDouble
*/
public static final double previousDouble (double d) {
return nextDouble(d,false);
}
/**
* Overrides Cloneable
*/
{
// for primitives or immutables, shallow clone is enough
return other;
}
/**
* Generates a hash code for the message format object.
*/
public int hashCode() {
// enough for reasonable distribution
}
return result;
}
/**
* Equality comparision between two
*/
if (this == obj) // quick check
return true;
return false;
}
/**
* After reading an object from the input stream, do a simple verification
* to maintain class invariants.
* @throws InvalidObjectException if the objects read from the stream is invalid.
*/
throw new InvalidObjectException(
"limits and format arrays of different length.");
}
}
// ===============privates===========================
/**
* A list of lower bounds for the choices. The formatter will return
* <code>choiceFormats[i]</code> if the number being formatted is greater than or equal to
* <code>choiceLimits[i]</code> and less than <code>choiceLimits[i+1]</code>.
* @serial
*/
private double[] choiceLimits;
/**
* A list of choice strings. The formatter will return
* <code>choiceFormats[i]</code> if the number being formatted is greater than or equal to
* <code>choiceLimits[i]</code> and less than <code>choiceLimits[i+1]</code>.
* @serial
*/
/*
static final long SIGN = 0x8000000000000000L;
static final long EXPONENT = 0x7FF0000000000000L;
static final long SIGNIFICAND = 0x000FFFFFFFFFFFFFL;
private static double nextDouble (double d, boolean positive) {
if (Double.isNaN(d) || Double.isInfinite(d)) {
return d;
}
long bits = Double.doubleToLongBits(d);
long significand = bits & SIGNIFICAND;
if (bits < 0) {
significand |= (SIGN | EXPONENT);
}
long exponent = bits & EXPONENT;
if (positive) {
significand += 1;
// FIXME fix overflow & underflow
} else {
significand -= 1;
// FIXME fix overflow & underflow
}
bits = exponent | (significand & ~EXPONENT);
return Double.longBitsToDouble(bits);
}
*/
/**
* Finds the least double greater than d (if positive == true),
* or the greatest double less than d (if positive == false).
* If NaN, returns same value.
*
* Does not affect floating-point flags,
* provided these member functions do not:
* Double.longBitsToDouble(long)
* Double.doubleToLongBits(double)
* Double.isNaN(double)
*/
/* filter out NaN's */
return d;
}
/* zero's are also a special case */
if (d == 0.0) {
if (positive) {
return smallestPositiveDouble;
} else {
return -smallestPositiveDouble;
}
}
/* if entering here, d is a nonzero value */
/* hold all bits in a long for later use */
/* strip off the sign bit */
/* if next double away from zero, increase magnitude */
if (magnitude != POSITIVEINFINITY) {
magnitude += 1;
}
}
/* else decrease magnitude */
else {
magnitude -= 1;
}
/* restore sign bit and return */
}
return newArray;
}
return newArray;
}
}