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EmptyGreatestComparer
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net.sf.saxon.expr.sort</FONT>
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Class EmptyGreatestComparer</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.EmptyGreatestComparer</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>
<HR>
<DL>
<DT><PRE>public class <B>EmptyGreatestComparer</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 that modifies a base comparer by sorting empty key values and NaN values last (greatest),
as opposed to the default which sorts them first.
<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.EmptyGreatestComparer">Serialized Form</A></DL>
<HR>
<P>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<B>Constructor Summary</B></FONT></TH>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/sort/EmptyGreatestComparer.html#EmptyGreatestComparer(net.sf.saxon.expr.sort.AtomicComparer)">EmptyGreatestComparer</A></B>(<A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html" title="interface in net.sf.saxon.expr.sort">AtomicComparer</A> baseComparer)</CODE>
<BR>
Create an EmptyGreatestComparer</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/sort/EmptyGreatestComparer.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 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> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/sort/EmptyGreatestComparer.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/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/EmptyGreatestComparer.html#getBaseComparer()">getBaseComparer</A></B>()</CODE>
<BR>
Get the underlying comparer (which compares empty least)</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/EmptyGreatestComparer.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/EmptyGreatestComparer.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> <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/EmptyGreatestComparer.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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<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>
</TR>
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<P>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<B>Constructor Detail</B></FONT></TH>
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<A NAME="EmptyGreatestComparer(net.sf.saxon.expr.sort.AtomicComparer)"><!-- --></A><H3>
EmptyGreatestComparer</H3>
<PRE>
public <B>EmptyGreatestComparer</B>(<A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html" title="interface in net.sf.saxon.expr.sort">AtomicComparer</A> baseComparer)</PRE>
<DL>
<DD>Create an EmptyGreatestComparer
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>baseComparer</CODE> - the comparer used to compare non-empty values (which typically sorts empty
as least)</DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<B>Method Detail</B></FONT></TH>
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<A NAME="getBaseComparer()"><!-- --></A><H3>
getBaseComparer</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/sort/AtomicComparer.html" title="interface in net.sf.saxon.expr.sort">AtomicComparer</A> <B>getBaseComparer</B>()</PRE>
<DL>
<DD>Get the underlying comparer (which compares empty least)
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the base comparer</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)
throws <A HREF="../../../../../net/sf/saxon/trans/NoDynamicContextException.html" title="class in net.sf.saxon.trans">NoDynamicContextException</A></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. It is intended that this should normally be an instance
of AtomicValue, though this restriction is not enforced. If it is a StringValue, the
collator is used to compare the values, otherwise the value must implement the java.util.Comparable
interface.<DD><CODE>b</CODE> - the second object to be compared. This must be comparable with the first object: for
example, if one is a string, they must both be strings.
<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
<DD><CODE><A HREF="../../../../../net/sf/saxon/trans/NoDynamicContextException.html" title="class in net.sf.saxon.trans">NoDynamicContextException</A></CODE> - if this comparer required access to dynamic context information,
notably the implicit timezone, and this information is not available. In general this happens if a
context-dependent comparison is attempted at compile-time, and it signals the compiler to generate
code that tries again at run-time.</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)
throws <A HREF="../../../../../net/sf/saxon/trans/NoDynamicContextException.html" title="class in net.sf.saxon.trans">NoDynamicContextException</A></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
<DD><CODE><A HREF="../../../../../net/sf/saxon/trans/NoDynamicContextException.html" title="class in net.sf.saxon.trans">NoDynamicContextException</A></CODE></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)
throws <A HREF="../../../../../net/sf/saxon/trans/NoDynamicContextException.html" title="class in net.sf.saxon.trans">NoDynamicContextException</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>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../net/sf/saxon/trans/NoDynamicContextException.html" title="class in net.sf.saxon.trans">NoDynamicContextException</A></CODE></DL>
</DD>
</DL>
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