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package com.sun.org.apache.xerces.internal.impl.dv.xs;
import com.sun.org.apache.xerces.internal.impl.dv.InvalidDatatypeValueException;
import com.sun.org.apache.xerces.internal.impl.dv.ValidationContext;
import com.sun.org.apache.xerces.internal.xs.datatypes.XSFloat;
/**
* Represent the schema type "float"
*
* @xerces.internal
*
* @author Neeraj Bajaj, Sun Microsystems, inc.
* @author Sandy Gao, IBM
*
* @version $Id: FloatDV.java,v 1.7 2010-11-01 04:39:47 joehw Exp $
*/
public class FloatDV extends TypeValidator {
public short getAllowedFacets(){
return ( XSSimpleTypeDecl.FACET_PATTERN | XSSimpleTypeDecl.FACET_WHITESPACE | XSSimpleTypeDecl.FACET_ENUMERATION |XSSimpleTypeDecl.FACET_MAXINCLUSIVE |XSSimpleTypeDecl.FACET_MININCLUSIVE | XSSimpleTypeDecl.FACET_MAXEXCLUSIVE | XSSimpleTypeDecl.FACET_MINEXCLUSIVE );
}//getAllowedFacets()
//convert a String to Float form, we have to take care of cases specified in spec like INF, -INF and NaN
public Object getActualValue(String content, ValidationContext context) throws InvalidDatatypeValueException {
try{
return new XFloat(content);
} catch (NumberFormatException ex){
throw new InvalidDatatypeValueException("cvc-datatype-valid.1.2.1", new Object[]{content, "float"});
}
}//getActualValue()
// Can't call Float#compareTo method, because it's introduced in jdk 1.2
public int compare(Object value1, Object value2){
return ((XFloat)value1).compareTo((XFloat)value2);
}//compare()
//distinguishes between identity and equality for float datatype
//0.0 is equal but not identical to -0.0
public boolean isIdentical (Object value1, Object value2) {
if (value2 instanceof XFloat) {
return ((XFloat)value1).isIdentical((XFloat)value2);
}
return false;
}//isIdentical()
private static final class XFloat implements XSFloat {
private final float value;
public XFloat(String s) throws NumberFormatException {
if (DoubleDV.isPossibleFP(s)) {
value = Float.parseFloat(s);
}
else if ( s.equals("INF") ) {
value = Float.POSITIVE_INFINITY;
}
else if ( s.equals("-INF") ) {
value = Float.NEGATIVE_INFINITY;
}
else if ( s.equals("NaN") ) {
value = Float.NaN;
}
else {
throw new NumberFormatException(s);
}
}
public boolean equals(Object val) {
if (val == this)
return true;
if (!(val instanceof XFloat))
return false;
XFloat oval = (XFloat)val;
// NOTE: we don't distinguish 0.0 from -0.0
if (value == oval.value)
return true;
if (value != value && oval.value != oval.value)
return true;
return false;
}
public int hashCode() {
// This check is necessary because floatToIntBits(+0) != floatToIntBits(-0)
return (value == 0f) ? 0 : Float.floatToIntBits(value);
}
// NOTE: 0.0 is equal but not identical to -0.0
public boolean isIdentical (XFloat val) {
if (val == this) {
return true;
}
if (value == val.value) {
return (value != 0.0f ||
(Float.floatToIntBits(value) == Float.floatToIntBits(val.value)));
}
if (value != value && val.value != val.value)
return true;
return false;
}
private int compareTo(XFloat val) {
float oval = val.value;
// this < other
if (value < oval)
return -1;
// this > other
if (value > oval)
return 1;
// this == other
// NOTE: we don't distinguish 0.0 from -0.0
if (value == oval)
return 0;
// one of the 2 values or both is/are NaN(s)
if (value != value) {
// this = NaN = other
if (oval != oval)
return 0;
// this is NaN <> other
return INDETERMINATE;
}
// other is NaN <> this
return INDETERMINATE;
}
private String canonical;
public synchronized String toString() {
if (canonical == null) {
if (value == Float.POSITIVE_INFINITY)
canonical = "INF";
else if (value == Float.NEGATIVE_INFINITY)
canonical = "-INF";
else if (value != value)
canonical = "NaN";
// NOTE: we don't distinguish 0.0 from -0.0
else if (value == 0)
canonical = "0.0E1";
else {
// REVISIT: use the java algorithm for now, because we
// don't know what to output for 1.1f (which is no
// actually 1.1)
canonical = Float.toString(value);
// if it contains 'E', then it should be a valid schema
// canonical representation
if (canonical.indexOf('E') == -1) {
int len = canonical.length();
// at most 3 longer: E, -, 9
char[] chars = new char[len+3];
canonical.getChars(0, len, chars, 0);
// expected decimal point position
int edp = chars[0] == '-' ? 2 : 1;
// for non-zero integer part
if (value >= 1 || value <= -1) {
// decimal point position
int dp = canonical.indexOf('.');
// move the digits: ddd.d --> d.ddd
for (int i = dp; i > edp; i--) {
chars[i] = chars[i-1];
}
chars[edp] = '.';
// trim trailing zeros: d00.0 --> d.000 --> d.
while (chars[len-1] == '0')
len--;
// add the last zero if necessary: d. --> d.0
if (chars[len-1] == '.')
len++;
// append E: d.dd --> d.ddE
chars[len++] = 'E';
// how far we shifted the decimal point
int shift = dp - edp;
// append the exponent --> d.ddEd
// the exponent is at most 7
chars[len++] = (char)(shift + '0');
}
else {
// non-zero digit point
int nzp = edp + 1;
// skip zeros: 0.003
while (chars[nzp] == '0')
nzp++;
// put the first non-zero digit to the left of '.'
chars[edp-1] = chars[nzp];
chars[edp] = '.';
// move other digits (non-zero) to the right of '.'
for (int i = nzp+1, j = edp+1; i < len; i++, j++)
chars[j] = chars[i];
// adjust the length
len -= nzp - edp;
// append 0 if nessary: 0.03 --> 3. --> 3.0
if (len == edp + 1)
chars[len++] = '0';
// append E-: d.dd --> d.ddE-
chars[len++] = 'E';
chars[len++] = '-';
// how far we shifted the decimal point
int shift = nzp - edp;
// append the exponent --> d.ddEd
// the exponent is at most 3
chars[len++] = (char)(shift + '0');
}
canonical = new String(chars, 0, len);
}
}
}
return canonical;
}
public float getValue() {
return value;
}
}
} // class FloatDV