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ComparableAtomicValueComparer
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net.sf.saxon.expr.sort</FONT>
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Class ComparableAtomicValueComparer</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.ComparableAtomicValueComparer</B>
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<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/DecimalSortComparer.html" title="class in net.sf.saxon.expr.sort">DecimalSortComparer</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>ComparableAtomicValueComparer</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></DL>
</PRE>

<P>
A comparer for comparing two "ordinary" atomic values, where the values implement the Comparable
 interface and the equals() method with the appropriate XPath semantics. This rules out use of
 collations, conversion of untyped atomic values, and context dependencies such as implicit timezone.
<P>

<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../serialized-form.html#net.sf.saxon.expr.sort.ComparableAtomicValueComparer">Serialized Form</A></DL>
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<P>

<!-- ======== CONSTRUCTOR SUMMARY ======== -->

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<CODE>protected </CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/sort/ComparableAtomicValueComparer.html#ComparableAtomicValueComparer()">ComparableAtomicValueComparer</A></B>()</CODE>

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<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/sort/ComparableAtomicValueComparer.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>&nbsp;a,
                    <A HREF="../../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A>&nbsp;b)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Compare two AtomicValue objects 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>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/sort/ComparableAtomicValueComparer.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>&nbsp;a,
              <A HREF="../../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A>&nbsp;b)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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>&nbsp;<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/ComparableAtomicValueComparer.html#getCollator()">getCollator</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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>&nbsp;<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/ComparableAtomicValueComparer.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>&nbsp;a)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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&nbsp;<A HREF="../../../../../net/sf/saxon/expr/sort/ComparableAtomicValueComparer.html" title="class in net.sf.saxon.expr.sort">ComparableAtomicValueComparer</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/sort/ComparableAtomicValueComparer.html#getInstance()">getInstance</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the singleton instance of this class</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<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/ComparableAtomicValueComparer.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>&nbsp;context)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Supply the dynamic context in case this is needed for the comparison</TD>
</TR>
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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>
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<!-- ========= CONSTRUCTOR DETAIL ======== -->

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<A NAME="ComparableAtomicValueComparer()"><!-- --></A><H3>
ComparableAtomicValueComparer</H3>
<PRE>
protected <B>ComparableAtomicValueComparer</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/ComparableAtomicValueComparer.html" title="class in net.sf.saxon.expr.sort">ComparableAtomicValueComparer</A> <B>getInstance</B>()</PRE>
<DL>
<DD>Get the singleton instance of this class
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the singleton instance of this class</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>&nbsp;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>&nbsp;a,
                               <A HREF="../../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A>&nbsp;b)</PRE>
<DL>
<DD>Compare two AtomicValue objects according to the rules for their data type. UntypedAtomic
 values are compared as if they were strings; if different semantics are wanted, the conversion
 must be done by the caller.
<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 object to be compared. This must be an AtomicValue and it must implement
 Comparable with context-free XPath comparison semantics<DD><CODE>b</CODE> - the second object to be compared. This must be an AtomicValue and it must implement
 Comparable with context-free XPath comparison semantics
<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 comparable</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>&nbsp;a,
                             <A HREF="../../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A>&nbsp;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. This must be an AtomicValue and it must implement
 equals() with context-free XPath comparison semantics<DD><CODE>b</CODE> - the second object to be compared. This must be an AtomicValue and it must implement
 equals() with context-free XPath comparison semantics
<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>&nbsp;a)</PRE>
<DL>
<DD>Get a comparison key for an object. This must satisfy the rule that if two objects are equal,
 then their comparison keys are equal, 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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