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NumericComparer
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net.sf.saxon.expr.sort</FONT>
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Class NumericComparer</H2>
<PRE>
<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>net.sf.saxon.expr.sort.NumericComparer</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</A>, <A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html" title="interface in net.sf.saxon.expr.sort">AtomicComparer</A></DD>
</DL>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../../net/sf/saxon/expr/sort/NumericComparer11.html" title="class in net.sf.saxon.expr.sort">NumericComparer11</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>NumericComparer</B><DT>extends <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html" title="interface in net.sf.saxon.expr.sort">AtomicComparer</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</A></DL>
</PRE>
<P>
A Comparer used for comparing sort keys when data-type="number". The items to be
compared are converted to numbers, and the numbers are then compared directly. NaN values
compare equal to each other, and equal to an empty sequence, but less than anything else.
<p/>
This class is used in XSLT only, so there is no need to handle XQuery's "empty least" vs
"empty greatest" options.
<P>
<P>
<DL>
<DT><B>Author:</B></DT>
<DD>Michael H. Kay</DD>
<DT><B>See Also:</B><DD><A HREF="../../../../../serialized-form.html#net.sf.saxon.expr.sort.NumericComparer">Serialized Form</A></DL>
<HR>
<P>
<!-- =========== FIELD SUMMARY =========== -->
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<B>Field Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected <A HREF="../../../../../net/sf/saxon/type/StringToDouble.html" title="class in net.sf.saxon.type">StringToDouble</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/sort/NumericComparer.html#converter">converter</A></B></CODE>
<BR>
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<CODE>protected </CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/sort/NumericComparer.html#NumericComparer()">NumericComparer</A></B>()</CODE>
<BR>
</TD>
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<!-- ========== METHOD SUMMARY =========== -->
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/sort/NumericComparer.html#compareAtomicValues(net.sf.saxon.value.AtomicValue, net.sf.saxon.value.AtomicValue)">compareAtomicValues</A></B>(<A HREF="../../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A> a,
<A HREF="../../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A> b)</CODE>
<BR>
Compare two Items by converting them to numbers and comparing the numeric values.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/sort/NumericComparer.html#comparesEqual(net.sf.saxon.value.AtomicValue, net.sf.saxon.value.AtomicValue)">comparesEqual</A></B>(<A HREF="../../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A> a,
<A HREF="../../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A> b)</CODE>
<BR>
Compare two AtomicValue objects for equality according to the rules for their data type.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../../net/sf/saxon/lib/StringCollator.html" title="interface in net.sf.saxon.lib">StringCollator</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/sort/NumericComparer.html#getCollator()">getCollator</A></B>()</CODE>
<BR>
Get the collation used by this AtomicComparer if any</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../../net/sf/saxon/expr/sort/ComparisonKey.html" title="class in net.sf.saxon.expr.sort">ComparisonKey</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/sort/NumericComparer.html#getComparisonKey(net.sf.saxon.value.AtomicValue)">getComparisonKey</A></B>(<A HREF="../../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A> a)</CODE>
<BR>
Get a comparison key for an object.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../../../net/sf/saxon/expr/sort/NumericComparer.html" title="class in net.sf.saxon.expr.sort">NumericComparer</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/sort/NumericComparer.html#getInstance()">getInstance</A></B>()</CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html" title="interface in net.sf.saxon.expr.sort">AtomicComparer</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/sort/NumericComparer.html#provideContext(net.sf.saxon.expr.XPathContext)">provideContext</A></B>(<A HREF="../../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> context)</CODE>
<BR>
Supply the dynamic context in case this is needed for the comparison</TD>
</TR>
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<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
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<A NAME="converter"><!-- --></A><H3>
converter</H3>
<PRE>
protected <A HREF="../../../../../net/sf/saxon/type/StringToDouble.html" title="class in net.sf.saxon.type">StringToDouble</A> <B>converter</B></PRE>
<DL>
<DL>
</DL>
</DL>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<B>Constructor Detail</B></FONT></TH>
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<A NAME="NumericComparer()"><!-- --></A><H3>
NumericComparer</H3>
<PRE>
protected <B>NumericComparer</B>()</PRE>
<DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<A NAME="getInstance()"><!-- --></A><H3>
getInstance</H3>
<PRE>
public static <A HREF="../../../../../net/sf/saxon/expr/sort/NumericComparer.html" title="class in net.sf.saxon.expr.sort">NumericComparer</A> <B>getInstance</B>()</PRE>
<DL>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getCollator()"><!-- --></A><H3>
getCollator</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/lib/StringCollator.html" title="interface in net.sf.saxon.lib">StringCollator</A> <B>getCollator</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html#getCollator()">AtomicComparer</A></CODE></B></DD>
<DD>Get the collation used by this AtomicComparer if any
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html#getCollator()">getCollator</A></CODE> in interface <CODE><A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html" title="interface in net.sf.saxon.expr.sort">AtomicComparer</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the collation used for comparing strings, or null if not applicable</DL>
</DD>
</DL>
<HR>
<A NAME="provideContext(net.sf.saxon.expr.XPathContext)"><!-- --></A><H3>
provideContext</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html" title="interface in net.sf.saxon.expr.sort">AtomicComparer</A> <B>provideContext</B>(<A HREF="../../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> context)</PRE>
<DL>
<DD>Supply the dynamic context in case this is needed for the comparison
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html#provideContext(net.sf.saxon.expr.XPathContext)">provideContext</A></CODE> in interface <CODE><A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html" title="interface in net.sf.saxon.expr.sort">AtomicComparer</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - the dynamic evaluation context
<DT><B>Returns:</B><DD>either the original AtomicComparer, or a new AtomicComparer in which the context
is known. The original AtomicComparer is not modified</DL>
</DD>
</DL>
<HR>
<A NAME="compareAtomicValues(net.sf.saxon.value.AtomicValue, net.sf.saxon.value.AtomicValue)"><!-- --></A><H3>
compareAtomicValues</H3>
<PRE>
public int <B>compareAtomicValues</B>(<A HREF="../../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A> a,
<A HREF="../../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A> b)</PRE>
<DL>
<DD>Compare two Items by converting them to numbers and comparing the numeric values. If either
value cannot be converted to a number, it is treated as NaN, and compares less that the other
(two NaN values compare equal).
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html#compareAtomicValues(net.sf.saxon.value.AtomicValue, net.sf.saxon.value.AtomicValue)">compareAtomicValues</A></CODE> in interface <CODE><A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html" title="interface in net.sf.saxon.expr.sort">AtomicComparer</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>a</CODE> - the first Item to be compared.<DD><CODE>b</CODE> - the second Item to be compared.
<DT><B>Returns:</B><DD><0 if a<b, 0 if a=b, >0 if a>b
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/ClassCastException.html?is-external=true" title="class or interface in java.lang">ClassCastException</A></CODE> - if the objects are not Items</DL>
</DD>
</DL>
<HR>
<A NAME="comparesEqual(net.sf.saxon.value.AtomicValue, net.sf.saxon.value.AtomicValue)"><!-- --></A><H3>
comparesEqual</H3>
<PRE>
public boolean <B>comparesEqual</B>(<A HREF="../../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A> a,
<A HREF="../../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A> b)</PRE>
<DL>
<DD>Compare two AtomicValue objects for equality according to the rules for their data type. UntypedAtomic
values are compared by converting to the type of the other operand.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html#comparesEqual(net.sf.saxon.value.AtomicValue, net.sf.saxon.value.AtomicValue)">comparesEqual</A></CODE> in interface <CODE><A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html" title="interface in net.sf.saxon.expr.sort">AtomicComparer</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>a</CODE> - the first object to be compared.<DD><CODE>b</CODE> - the second object to be compared.
<DT><B>Returns:</B><DD>true if the values are equal, false if not
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/ClassCastException.html?is-external=true" title="class or interface in java.lang">ClassCastException</A></CODE> - if the objects are not comparable</DL>
</DD>
</DL>
<HR>
<A NAME="getComparisonKey(net.sf.saxon.value.AtomicValue)"><!-- --></A><H3>
getComparisonKey</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/sort/ComparisonKey.html" title="class in net.sf.saxon.expr.sort">ComparisonKey</A> <B>getComparisonKey</B>(<A HREF="../../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A> a)</PRE>
<DL>
<DD>Get a comparison key for an object. This must satisfy the rule that if two objects are equal
according to the XPath eq operator, then their comparison keys are equal according to the Java
equals() method, and vice versa. There is no requirement that the
comparison keys should reflect the ordering of the underlying objects.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html#getComparisonKey(net.sf.saxon.value.AtomicValue)">getComparisonKey</A></CODE> in interface <CODE><A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html" title="interface in net.sf.saxon.expr.sort">AtomicComparer</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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