/*
* @(#)ComparisonFunction.java
*
* Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistribution of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN")
* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
* AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
* REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
* INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
* OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
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*
* You acknowledge that this software is not designed or intended for use in
* the design, construction, operation or maintenance of any nuclear facility.
*/
package com.sun.xacml.cond;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Set;
import com.sun.xacml.EvaluationCtx;
import com.sun.xacml.attr.AttributeValue;
import com.sun.xacml.attr.BooleanAttribute;
import com.sun.xacml.attr.DateAttribute;
import com.sun.xacml.attr.DateTimeAttribute;
import com.sun.xacml.attr.DoubleAttribute;
import com.sun.xacml.attr.IntegerAttribute;
import com.sun.xacml.attr.StringAttribute;
import com.sun.xacml.attr.TimeAttribute;
/**
* A class that implements all of the standard comparison functions.
*
* @since 1.0
* @author Steve Hanna
* @author Seth Proctor
*
* Adding generic type support by Christian Mueller (geotools)
*/
public class ComparisonFunction extends FunctionBase {
/**
* Standard identifier for the integer-greater-than function.
*/
public static final String NAME_INTEGER_GREATER_THAN = FUNCTION_NS + "integer-greater-than";
/**
* Standard identifier for the integer-greater-than-or-equal function.
*/
public static final String NAME_INTEGER_GREATER_THAN_OR_EQUAL = FUNCTION_NS
+ "integer-greater-than-or-equal";
/**
* Standard identifier for the integer-less-than function.
*/
public static final String NAME_INTEGER_LESS_THAN = FUNCTION_NS + "integer-less-than";
/**
* Standard identifier for the integer-less-than-or-equal function.
*/
public static final String NAME_INTEGER_LESS_THAN_OR_EQUAL = FUNCTION_NS
+ "integer-less-than-or-equal";
/**
* Standard identifier for the double-greater-than function.
*/
public static final String NAME_DOUBLE_GREATER_THAN = FUNCTION_NS + "double-greater-than";
/**
* Standard identifier for the double-greater-than-or-equal function.
*/
public static final String NAME_DOUBLE_GREATER_THAN_OR_EQUAL = FUNCTION_NS
+ "double-greater-than-or-equal";
/**
* Standard identifier for the double-less-than function.
*/
public static final String NAME_DOUBLE_LESS_THAN = FUNCTION_NS + "double-less-than";
/**
* Standard identifier for the double-less-than-or-equal function.
*/
public static final String NAME_DOUBLE_LESS_THAN_OR_EQUAL = FUNCTION_NS
+ "double-less-than-or-equal";
/**
* Standard identifier for the string-greater-than function.
*/
public static final String NAME_STRING_GREATER_THAN = FUNCTION_NS + "string-greater-than";
/**
* Standard identifier for the string-greater-than-or-equal function.
*/
public static final String NAME_STRING_GREATER_THAN_OR_EQUAL = FUNCTION_NS
+ "string-greater-than-or-equal";
/**
* Standard identifier for the string-less-than function.
*/
public static final String NAME_STRING_LESS_THAN = FUNCTION_NS + "string-less-than";
/**
* Standard identifier for the string-less-than-or-equal function.
*/
public static final String NAME_STRING_LESS_THAN_OR_EQUAL = FUNCTION_NS
+ "string-less-than-or-equal";
/**
* Standard identifier for the time-greater-than function.
*/
public static final String NAME_TIME_GREATER_THAN = FUNCTION_NS + "time-greater-than";
/**
* Standard identifier for the time-greater-than-or-equal function.
*/
public static final String NAME_TIME_GREATER_THAN_OR_EQUAL = FUNCTION_NS
+ "time-greater-than-or-equal";
/**
* Standard identifier for the time-less-than function.
*/
public static final String NAME_TIME_LESS_THAN = FUNCTION_NS + "time-less-than";
/**
* Standard identifier for the time-less-than-or-equal function.
*/
public static final String NAME_TIME_LESS_THAN_OR_EQUAL = FUNCTION_NS
+ "time-less-than-or-equal";
/**
* Standard identifier for the dateTime-greater-than function.
*/
public static final String NAME_DATETIME_GREATER_THAN = FUNCTION_NS + "dateTime-greater-than";
/**
* Standard identifier for the dateTime-greater-than-or-equal function.
*/
public static final String NAME_DATETIME_GREATER_THAN_OR_EQUAL = FUNCTION_NS
+ "dateTime-greater-than-or-equal";
/**
* Standard identifier for the dateTime-less-than function.
*/
public static final String NAME_DATETIME_LESS_THAN = FUNCTION_NS + "dateTime-less-than";
/**
* Standard identifier for the dateTime-less-than-or-equal function.
*/
public static final String NAME_DATETIME_LESS_THAN_OR_EQUAL = FUNCTION_NS
+ "dateTime-less-than-or-equal";
/**
* Standard identifier for the date-greater-than function.
*/
public static final String NAME_DATE_GREATER_THAN = FUNCTION_NS + "date-greater-than";
/**
* Standard identifier for the date-greater-than-or-equal function.
*/
public static final String NAME_DATE_GREATER_THAN_OR_EQUAL = FUNCTION_NS
+ "date-greater-than-or-equal";
/**
* Standard identifier for the date-less-than function.
*/
public static final String NAME_DATE_LESS_THAN = FUNCTION_NS + "date-less-than";
/**
* Standard identifier for the date-less-than-or-equal function.
*/
public static final String NAME_DATE_LESS_THAN_OR_EQUAL = FUNCTION_NS
+ "date-less-than-or-equal";
// private identifiers for the supported functions
private static final int ID_INTEGER_GREATER_THAN = 0;
private static final int ID_INTEGER_GREATER_THAN_OR_EQUAL = 1;
private static final int ID_INTEGER_LESS_THAN = 2;
private static final int ID_INTEGER_LESS_THAN_OR_EQUAL = 3;
private static final int ID_DOUBLE_GREATER_THAN = 4;
private static final int ID_DOUBLE_GREATER_THAN_OR_EQUAL = 5;
private static final int ID_DOUBLE_LESS_THAN = 6;
private static final int ID_DOUBLE_LESS_THAN_OR_EQUAL = 7;
private static final int ID_STRING_GREATER_THAN = 8;
private static final int ID_STRING_GREATER_THAN_OR_EQUAL = 9;
private static final int ID_STRING_LESS_THAN = 10;
private static final int ID_STRING_LESS_THAN_OR_EQUAL = 11;
private static final int ID_TIME_GREATER_THAN = 12;
private static final int ID_TIME_GREATER_THAN_OR_EQUAL = 13;
private static final int ID_TIME_LESS_THAN = 14;
private static final int ID_TIME_LESS_THAN_OR_EQUAL = 15;
private static final int ID_DATE_GREATER_THAN = 16;
private static final int ID_DATE_GREATER_THAN_OR_EQUAL = 17;
private static final int ID_DATE_LESS_THAN = 18;
private static final int ID_DATE_LESS_THAN_OR_EQUAL = 19;
private static final int ID_DATETIME_GREATER_THAN = 20;
private static final int ID_DATETIME_GREATER_THAN_OR_EQUAL = 21;
private static final int ID_DATETIME_LESS_THAN = 22;
private static final int ID_DATETIME_LESS_THAN_OR_EQUAL = 23;
// mappings from name to private identifier and argument datatype
private static HashMap<String, Integer> idMap;
private static HashMap<String, String> typeMap;
/**
* Static initializer to setup the two maps.
*/
static {
idMap = new HashMap<String, Integer>();
idMap.put(NAME_INTEGER_GREATER_THAN, new Integer(ID_INTEGER_GREATER_THAN));
idMap
.put(NAME_INTEGER_GREATER_THAN_OR_EQUAL, new Integer(
ID_INTEGER_GREATER_THAN_OR_EQUAL));
idMap.put(NAME_INTEGER_LESS_THAN, new Integer(ID_INTEGER_LESS_THAN));
idMap.put(NAME_INTEGER_LESS_THAN_OR_EQUAL, new Integer(ID_INTEGER_LESS_THAN_OR_EQUAL));
idMap.put(NAME_DOUBLE_GREATER_THAN, new Integer(ID_DOUBLE_GREATER_THAN));
idMap.put(NAME_DOUBLE_GREATER_THAN_OR_EQUAL, new Integer(ID_DOUBLE_GREATER_THAN_OR_EQUAL));
idMap.put(NAME_DOUBLE_LESS_THAN, new Integer(ID_DOUBLE_LESS_THAN));
idMap.put(NAME_DOUBLE_LESS_THAN_OR_EQUAL, new Integer(ID_DOUBLE_LESS_THAN_OR_EQUAL));
idMap.put(NAME_STRING_GREATER_THAN, new Integer(ID_STRING_GREATER_THAN));
idMap.put(NAME_STRING_GREATER_THAN_OR_EQUAL, new Integer(ID_STRING_GREATER_THAN_OR_EQUAL));
idMap.put(NAME_STRING_LESS_THAN, new Integer(ID_STRING_LESS_THAN));
idMap.put(NAME_STRING_LESS_THAN_OR_EQUAL, new Integer(ID_STRING_LESS_THAN_OR_EQUAL));
idMap.put(NAME_TIME_GREATER_THAN, new Integer(ID_TIME_GREATER_THAN));
idMap.put(NAME_TIME_GREATER_THAN_OR_EQUAL, new Integer(ID_TIME_GREATER_THAN_OR_EQUAL));
idMap.put(NAME_TIME_LESS_THAN, new Integer(ID_TIME_LESS_THAN));
idMap.put(NAME_TIME_LESS_THAN_OR_EQUAL, new Integer(ID_TIME_LESS_THAN_OR_EQUAL));
idMap.put(NAME_DATE_GREATER_THAN, new Integer(ID_DATE_GREATER_THAN));
idMap.put(NAME_DATE_GREATER_THAN_OR_EQUAL, new Integer(ID_DATE_GREATER_THAN_OR_EQUAL));
idMap.put(NAME_DATE_LESS_THAN, new Integer(ID_DATE_LESS_THAN));
idMap.put(NAME_DATE_LESS_THAN_OR_EQUAL, new Integer(ID_DATE_LESS_THAN_OR_EQUAL));
idMap.put(NAME_DATETIME_GREATER_THAN, new Integer(ID_DATETIME_GREATER_THAN));
idMap.put(NAME_DATETIME_GREATER_THAN_OR_EQUAL, new Integer(
ID_DATETIME_GREATER_THAN_OR_EQUAL));
idMap.put(NAME_DATETIME_LESS_THAN, new Integer(ID_DATETIME_LESS_THAN));
idMap.put(NAME_DATETIME_LESS_THAN_OR_EQUAL, new Integer(ID_DATETIME_LESS_THAN_OR_EQUAL));
typeMap = new HashMap<String, String>();
typeMap.put(NAME_INTEGER_GREATER_THAN, IntegerAttribute.identifier);
typeMap.put(NAME_INTEGER_GREATER_THAN_OR_EQUAL, IntegerAttribute.identifier);
typeMap.put(NAME_INTEGER_LESS_THAN, IntegerAttribute.identifier);
typeMap.put(NAME_INTEGER_LESS_THAN_OR_EQUAL, IntegerAttribute.identifier);
typeMap.put(NAME_DOUBLE_GREATER_THAN, DoubleAttribute.identifier);
typeMap.put(NAME_DOUBLE_GREATER_THAN_OR_EQUAL, DoubleAttribute.identifier);
typeMap.put(NAME_DOUBLE_LESS_THAN, DoubleAttribute.identifier);
typeMap.put(NAME_DOUBLE_LESS_THAN_OR_EQUAL, DoubleAttribute.identifier);
typeMap.put(NAME_STRING_GREATER_THAN, StringAttribute.identifier);
typeMap.put(NAME_STRING_GREATER_THAN_OR_EQUAL, StringAttribute.identifier);
typeMap.put(NAME_STRING_LESS_THAN, StringAttribute.identifier);
typeMap.put(NAME_STRING_LESS_THAN_OR_EQUAL, StringAttribute.identifier);
typeMap.put(NAME_TIME_GREATER_THAN, TimeAttribute.identifier);
typeMap.put(NAME_TIME_GREATER_THAN_OR_EQUAL, TimeAttribute.identifier);
typeMap.put(NAME_TIME_LESS_THAN, TimeAttribute.identifier);
typeMap.put(NAME_TIME_LESS_THAN_OR_EQUAL, TimeAttribute.identifier);
typeMap.put(NAME_DATETIME_GREATER_THAN, DateTimeAttribute.identifier);
typeMap.put(NAME_DATETIME_GREATER_THAN_OR_EQUAL, DateTimeAttribute.identifier);
typeMap.put(NAME_DATETIME_LESS_THAN, DateTimeAttribute.identifier);
typeMap.put(NAME_DATETIME_LESS_THAN_OR_EQUAL, DateTimeAttribute.identifier);
typeMap.put(NAME_DATE_GREATER_THAN, DateAttribute.identifier);
typeMap.put(NAME_DATE_GREATER_THAN_OR_EQUAL, DateAttribute.identifier);
typeMap.put(NAME_DATE_LESS_THAN, DateAttribute.identifier);
typeMap.put(NAME_DATE_LESS_THAN_OR_EQUAL, DateAttribute.identifier);
};
/**
* Creates a new <code>ComparisonFunction</code> object.
*
* @param functionName
* the standard XACML name of the function to be handled by this object, including
* the full namespace
*
* @throws IllegalArgumentException
* if the function isn't known
*/
public ComparisonFunction(String functionName) {
super(functionName, getId(functionName), getArgumentType(functionName), false, 2,
BooleanAttribute.identifier, false);
}
/**
* Private helper that returns the internal identifier used for the given standard function.
*/
private static int getId(String functionName) {
Integer i = (Integer) (idMap.get(functionName));
if (i == null)
throw new IllegalArgumentException("unknown comparison function " + functionName);
return i.intValue();
}
/**
* Private helper that returns the type used for the given standard function. Note that this
* doesn't check on the return value since the method always is called after getId, so we assume
* that the function is present.
*/
private static String getArgumentType(String functionName) {
return (String) (typeMap.get(functionName));
}
/**
* Returns a <code>Set</code> containing all the function identifiers supported by this class.
*
* @return a <code>Set</code> of <code>String</code>s
*/
public static Set<String> getSupportedIdentifiers() {
return Collections.unmodifiableSet(idMap.keySet());
}
/**
* Evaluate the function, using the specified parameters.
*
* @param inputs
* a <code>List</code> of <code>Evaluatable</code> objects representing the arguments
* passed to the function
* @param context
* an <code>EvaluationCtx</code> so that the <code>Evaluatable</code> objects can be
* evaluated
* @return an <code>EvaluationResult</code> representing the function's result
*/
public EvaluationResult evaluate(List<? extends Expression> inputs, EvaluationCtx context) {
// Evaluate the arguments
AttributeValue[] argValues = new AttributeValue[inputs.size()];
EvaluationResult result = evalArgs(inputs, context, argValues);
if (result != null)
return result;
// Now that we have real values, perform the comparison operation
boolean boolResult = false;
switch (getFunctionId()) {
case ID_INTEGER_GREATER_THAN: {
long arg0 = ((IntegerAttribute) (argValues[0])).getValue();
long arg1 = ((IntegerAttribute) (argValues[1])).getValue();
boolResult = (arg0 > arg1);
break;
}
case ID_INTEGER_GREATER_THAN_OR_EQUAL: {
long arg0 = ((IntegerAttribute) (argValues[0])).getValue();
long arg1 = ((IntegerAttribute) (argValues[1])).getValue();
boolResult = (arg0 >= arg1);
break;
}
case ID_INTEGER_LESS_THAN: {
long arg0 = ((IntegerAttribute) (argValues[0])).getValue();
long arg1 = ((IntegerAttribute) (argValues[1])).getValue();
boolResult = (arg0 < arg1);
break;
}
case ID_INTEGER_LESS_THAN_OR_EQUAL: {
long arg0 = ((IntegerAttribute) (argValues[0])).getValue();
long arg1 = ((IntegerAttribute) (argValues[1])).getValue();
boolResult = (arg0 <= arg1);
break;
}
case ID_DOUBLE_GREATER_THAN: {
double arg0 = ((DoubleAttribute) (argValues[0])).getValue();
double arg1 = ((DoubleAttribute) (argValues[1])).getValue();
boolResult = (doubleCompare(arg0, arg1) > 0);
break;
}
case ID_DOUBLE_GREATER_THAN_OR_EQUAL: {
double arg0 = ((DoubleAttribute) (argValues[0])).getValue();
double arg1 = ((DoubleAttribute) (argValues[1])).getValue();
boolResult = (doubleCompare(arg0, arg1) >= 0);
break;
}
case ID_DOUBLE_LESS_THAN: {
double arg0 = ((DoubleAttribute) (argValues[0])).getValue();
double arg1 = ((DoubleAttribute) (argValues[1])).getValue();
boolResult = (doubleCompare(arg0, arg1) < 0);
break;
}
case ID_DOUBLE_LESS_THAN_OR_EQUAL: {
double arg0 = ((DoubleAttribute) (argValues[0])).getValue();
double arg1 = ((DoubleAttribute) (argValues[1])).getValue();
boolResult = (doubleCompare(arg0, arg1) <= 0);
break;
}
case ID_STRING_GREATER_THAN: {
String arg0 = ((StringAttribute) (argValues[0])).getValue();
String arg1 = ((StringAttribute) (argValues[1])).getValue();
boolResult = (arg0.compareTo(arg1) > 0);
break;
}
case ID_STRING_GREATER_THAN_OR_EQUAL: {
String arg0 = ((StringAttribute) (argValues[0])).getValue();
String arg1 = ((StringAttribute) (argValues[1])).getValue();
boolResult = (arg0.compareTo(arg1) >= 0);
break;
}
case ID_STRING_LESS_THAN: {
String arg0 = ((StringAttribute) (argValues[0])).getValue();
String arg1 = ((StringAttribute) (argValues[1])).getValue();
boolResult = (arg0.compareTo(arg1) < 0);
break;
}
case ID_STRING_LESS_THAN_OR_EQUAL: {
String arg0 = ((StringAttribute) (argValues[0])).getValue();
String arg1 = ((StringAttribute) (argValues[1])).getValue();
boolResult = (arg0.compareTo(arg1) <= 0);
break;
}
case ID_TIME_GREATER_THAN: {
TimeAttribute arg0 = (TimeAttribute) (argValues[0]);
TimeAttribute arg1 = (TimeAttribute) (argValues[1]);
boolResult = (dateCompare(arg0.getValue(), arg0.getNanoseconds(), arg1.getValue(), arg1
.getNanoseconds()) > 0);
break;
}
case ID_TIME_GREATER_THAN_OR_EQUAL: {
TimeAttribute arg0 = (TimeAttribute) (argValues[0]);
TimeAttribute arg1 = (TimeAttribute) (argValues[1]);
boolResult = (dateCompare(arg0.getValue(), arg0.getNanoseconds(), arg1.getValue(), arg1
.getNanoseconds()) >= 0);
break;
}
case ID_TIME_LESS_THAN: {
TimeAttribute arg0 = (TimeAttribute) (argValues[0]);
TimeAttribute arg1 = (TimeAttribute) (argValues[1]);
boolResult = (dateCompare(arg0.getValue(), arg0.getNanoseconds(), arg1.getValue(), arg1
.getNanoseconds()) < 0);
break;
}
case ID_TIME_LESS_THAN_OR_EQUAL: {
TimeAttribute arg0 = (TimeAttribute) (argValues[0]);
TimeAttribute arg1 = (TimeAttribute) (argValues[1]);
boolResult = (dateCompare(arg0.getValue(), arg0.getNanoseconds(), arg1.getValue(), arg1
.getNanoseconds()) <= 0);
break;
}
case ID_DATETIME_GREATER_THAN: {
DateTimeAttribute arg0 = (DateTimeAttribute) (argValues[0]);
DateTimeAttribute arg1 = (DateTimeAttribute) (argValues[1]);
boolResult = (dateCompare(arg0.getValue(), arg0.getNanoseconds(), arg1.getValue(), arg1
.getNanoseconds()) > 0);
break;
}
case ID_DATETIME_GREATER_THAN_OR_EQUAL: {
DateTimeAttribute arg0 = (DateTimeAttribute) (argValues[0]);
DateTimeAttribute arg1 = (DateTimeAttribute) (argValues[1]);
boolResult = (dateCompare(arg0.getValue(), arg0.getNanoseconds(), arg1.getValue(), arg1
.getNanoseconds()) >= 0);
break;
}
case ID_DATETIME_LESS_THAN: {
DateTimeAttribute arg0 = (DateTimeAttribute) (argValues[0]);
DateTimeAttribute arg1 = (DateTimeAttribute) (argValues[1]);
boolResult = (dateCompare(arg0.getValue(), arg0.getNanoseconds(), arg1.getValue(), arg1
.getNanoseconds()) < 0);
break;
}
case ID_DATETIME_LESS_THAN_OR_EQUAL: {
DateTimeAttribute arg0 = (DateTimeAttribute) (argValues[0]);
DateTimeAttribute arg1 = (DateTimeAttribute) (argValues[1]);
boolResult = (dateCompare(arg0.getValue(), arg0.getNanoseconds(), arg1.getValue(), arg1
.getNanoseconds()) <= 0);
break;
}
case ID_DATE_GREATER_THAN: {
Date arg0 = ((DateAttribute) (argValues[0])).getValue();
Date arg1 = ((DateAttribute) (argValues[1])).getValue();
boolResult = (arg0.compareTo(arg1) > 0);
break;
}
case ID_DATE_GREATER_THAN_OR_EQUAL: {
Date arg0 = ((DateAttribute) (argValues[0])).getValue();
Date arg1 = ((DateAttribute) (argValues[1])).getValue();
boolResult = (arg0.compareTo(arg1) >= 0);
break;
}
case ID_DATE_LESS_THAN: {
Date arg0 = ((DateAttribute) (argValues[0])).getValue();
Date arg1 = ((DateAttribute) (argValues[1])).getValue();
boolResult = (arg0.compareTo(arg1) < 0);
break;
}
case ID_DATE_LESS_THAN_OR_EQUAL: {
Date arg0 = ((DateAttribute) (argValues[0])).getValue();
Date arg1 = ((DateAttribute) (argValues[1])).getValue();
boolResult = (arg0.compareTo(arg1) <= 0);
break;
}
}
// Return the result as a BooleanAttribute.
return EvaluationResult.getInstance(boolResult);
}
/**
* Helper function that does a comparison of the two doubles using the rules of XMLSchema. Like
* all compare methods, this returns 0 if they're equal, a positive value if d1 > d2, and a
* negative value if d1 < d2.
*/
private int doubleCompare(double d1, double d2) {
// see if the numbers equal each other
if (d1 == d2) {
// these are not NaNs, and therefore we just need to check that
// that they're not zeros, which may have different signs
if (d1 != 0)
return 0;
// they're both zeros, so we compare strings to figure out
// the significance of any signs
return Double.toString(d1).compareTo(Double.toString(d2));
}
// see if d1 is NaN
if (Double.isNaN(d1)) {
// d1 is NaN, so see if d2 is as well
if (Double.isNaN(d2)) {
// they're both NaNs, so they're equal
return 0;
} else {
// d1 is always bigger than d2 since it's a NaN
return 1;
}
}
// see if d2 is NaN
if (Double.isNaN(d2)) {
// d2 is a NaN, though d1 isn't, so d2 is always bigger
return -1;
}
// if we got here then neither is a NaN, and the numbers aren't
// equal...given those facts, basic comparison works the same in
// java as it's defined in XMLSchema, so now we can do the simple
// comparison and return whatever we find
return ((d1 > d2) ? 1 : -1);
}
/**
* Helper function to compare two Date objects and their associated nanosecond values. Like all
* compare methods, this returns 0 if they're equal, a positive value if d1 > d2, and a negative
* value if d1 < d2.
*/
private int dateCompare(Date d1, int n1, Date d2, int n2) {
int compareResult = d1.compareTo(d2);
// we only worry about the nanosecond values if the Dates are equal
if (compareResult != 0)
return compareResult;
// see if there's any difference
if (n1 == n2)
return 0;
// there is some difference in the nanoseconds, and that's how
// we'll determine the comparison
return ((n1 > n2) ? 1 : -1);
}
}