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|
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Xalan-Java 2: Class OpMap
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org.apache.xpath.compiler</FONT>
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Class OpMap</H2>
<PRE>
java.lang.Object
|
+--<B>org.apache.xpath.compiler.OpMap</B>
</PRE>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/apache/xpath/compiler/Compiler.html">Compiler</A></DD>
</DL>
<HR>
<DL>
<DT>public class <B>OpMap</B><DT>extends java.lang.Object</DL>
<P>
This class represents the data structure basics of the XPath
object.
<P>
<HR>
<P>
<!-- ======== INNER CLASS SUMMARY ======== -->
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<CODE> int[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#m_opMap">m_opMap</A></B></CODE>
<BR>
An operations map is used instead of a proper parse tree.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#m_tokenQueue">m_tokenQueue</A></B></CODE>
<BR>
TokenStack is the queue of used tokens.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#m_tokenQueueSize">m_tokenQueueSize</A></B></CODE>
<BR>
The current size of the token queue.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#MAPINDEX_LENGTH">MAPINDEX_LENGTH</A></B></CODE>
<BR>
The length is always the opcode position + 1.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#OpMap()">OpMap</A></B>()</CODE>
<BR>
</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getArgLength(int)">getArgLength</A></B>(int opPos)</CODE>
<BR>
Get the length of an operation.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getArgLengthOfStep(int)">getArgLengthOfStep</A></B>(int opPos)</CODE>
<BR>
Given a location step, get the length of that step.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getFirstChildPos(int)">getFirstChildPos</A></B>(int opPos)</CODE>
<BR>
Go to the first child of a given operation.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getFirstChildPosOfStep(int)">getFirstChildPosOfStep</A></B>(int opPos)</CODE>
<BR>
Get the first child position of a given location step.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getFirstPredicateOpPos(int)">getFirstPredicateOpPos</A></B>(int opPos)</CODE>
<BR>
Given an FROM_stepType position, return the position of the
first predicate, if there is one, or else this will point
to the end of the FROM_stepType.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getNextOpPos(int)">getNextOpPos</A></B>(int opPos)</CODE>
<BR>
Given an operation position, return the end position, i.e.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getNextOpPos(int[], int)">getNextOpPos</A></B>(int[] opMap,
int opPos)</CODE>
<BR>
Given an operation position, return the end position, i.e.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getNextStepPos(int)">getNextStepPos</A></B>(int opPos)</CODE>
<BR>
Given a location step position, return the end position, i.e.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getOp(int)">getOp</A></B>(int opPos)</CODE>
<BR>
Given an operation position, return the current op.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getOpMap()">getOpMap</A></B>()</CODE>
<BR>
Get the opcode list that describes the XPath operations.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getPatternString()">getPatternString</A></B>()</CODE>
<BR>
Return the expression as a string for diagnostics.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getStepLocalName(int)">getStepLocalName</A></B>(int opPosOfStep)</CODE>
<BR>
Get the local name of the step.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getStepNS(int)">getStepNS</A></B>(int opPosOfStep)</CODE>
<BR>
Get the namespace of the step.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getStepTestType(int)">getStepTestType</A></B>(int opPosOfStep)</CODE>
<BR>
Get the test type of the step, i.e.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getToken(int)">getToken</A></B>(int pos)</CODE>
<BR>
Get the XPath as a list of tokens.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getTokenQueue()">getTokenQueue</A></B>()</CODE>
<BR>
Get the XPath as a list of tokens.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#getTokenQueueSize()">getTokenQueueSize</A></B>()</CODE>
<BR>
Get size of the token queue.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xpath/compiler/OpMap.html#toString()">toString</A></B>()</CODE>
<BR>
Return the expression as a string for diagnostics.</TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class java.lang.Object</B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>equals,
getClass,
hashCode,
notify,
notifyAll,
wait,
wait,
wait</CODE></TD>
</TR>
</TABLE>
<P>
<!-- ============ FIELD DETAIL =========== -->
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<B>Field Detail</B></FONT></TD>
</TR>
</TABLE>
<A NAME="m_tokenQueue"><!-- --></A><H3>
m_tokenQueue</H3>
<PRE>
public java.lang.Object[] <B>m_tokenQueue</B></PRE>
<DL>
<DD>TokenStack is the queue of used tokens. The current token is the token at the
end of the m_tokenQueue. The idea is that the queue can be marked and a sequence
of tokens can be reused.</DL>
<HR>
<A NAME="m_tokenQueueSize"><!-- --></A><H3>
m_tokenQueueSize</H3>
<PRE>
public int <B>m_tokenQueueSize</B></PRE>
<DL>
<DD>The current size of the token queue.</DL>
<HR>
<A NAME="m_opMap"><!-- --></A><H3>
m_opMap</H3>
<PRE>
public int[] <B>m_opMap</B></PRE>
<DL>
<DD>An operations map is used instead of a proper parse tree. It contains
operations codes and indexes into the m_tokenQueue.
I use an array instead of a full parse tree in order to cut down
on the number of objects created.</DL>
<HR>
<A NAME="MAPINDEX_LENGTH"><!-- --></A><H3>
MAPINDEX_LENGTH</H3>
<PRE>
public static final int <B>MAPINDEX_LENGTH</B></PRE>
<DL>
<DD>The length is always the opcode position + 1.
Length is always expressed as the opcode+length bytes,
so it is always 2 or greater.</DL>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TD>
</TR>
</TABLE>
<A NAME="OpMap()"><!-- --></A><H3>
OpMap</H3>
<PRE>
public <B>OpMap</B>()</PRE>
<DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<B>Method Detail</B></FONT></TD>
</TR>
</TABLE>
<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>Return the expression as a string for diagnostics.<DD><DL>
<DT><B>Returns:</B><DD>The expression string.<DT><B>Overrides:</B><DD>toString in class java.lang.Object</DL>
</DD>
</DL>
<HR>
<A NAME="getPatternString()"><!-- --></A><H3>
getPatternString</H3>
<PRE>
public java.lang.String <B>getPatternString</B>()</PRE>
<DL>
<DD>Return the expression as a string for diagnostics.<DD><DL>
<DT><B>Returns:</B><DD>The expression string.</DL>
</DD>
</DL>
<HR>
<A NAME="getTokenQueue()"><!-- --></A><H3>
getTokenQueue</H3>
<PRE>
public java.lang.Object[] <B>getTokenQueue</B>()</PRE>
<DL>
<DD>Get the XPath as a list of tokens.<DD><DL>
<DT><B>Returns:</B><DD>an array of string tokens.</DL>
</DD>
</DL>
<HR>
<A NAME="getToken(int)"><!-- --></A><H3>
getToken</H3>
<PRE>
public java.lang.Object <B>getToken</B>(int pos)</PRE>
<DL>
<DD>Get the XPath as a list of tokens.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>pos</CODE> - index into token queue.<DT><B>Returns:</B><DD>The token, normally a string.</DL>
</DD>
</DL>
<HR>
<A NAME="getTokenQueueSize()"><!-- --></A><H3>
getTokenQueueSize</H3>
<PRE>
public int <B>getTokenQueueSize</B>()</PRE>
<DL>
<DD>Get size of the token queue.<DD><DL>
<DT><B>Returns:</B><DD>The size of the token queue.</DL>
</DD>
</DL>
<HR>
<A NAME="getOpMap()"><!-- --></A><H3>
getOpMap</H3>
<PRE>
public int[] <B>getOpMap</B>()</PRE>
<DL>
<DD>Get the opcode list that describes the XPath operations. It contains
operations codes and indexes into the m_tokenQueue.
I use an array instead of a full parse tree in order to cut down
on the number of objects created.<DD><DL>
<DT><B>Returns:</B><DD>An array of integers that is the opcode list that describes the XPath operations.</DL>
</DD>
</DL>
<HR>
<A NAME="getOp(int)"><!-- --></A><H3>
getOp</H3>
<PRE>
public int <B>getOp</B>(int opPos)</PRE>
<DL>
<DD>Given an operation position, return the current op.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>opPos</CODE> - index into op map.<DT><B>Returns:</B><DD>the op that corresponds to the opPos argument.</DL>
</DD>
</DL>
<HR>
<A NAME="getNextOpPos(int)"><!-- --></A><H3>
getNextOpPos</H3>
<PRE>
public int <B>getNextOpPos</B>(int opPos)</PRE>
<DL>
<DD>Given an operation position, return the end position, i.e. the
beginning of the next operation.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>opPos</CODE> - An op position of an operation for which there is a size
entry following.<DT><B>Returns:</B><DD>position of next operation in m_opMap.</DL>
</DD>
</DL>
<HR>
<A NAME="getNextStepPos(int)"><!-- --></A><H3>
getNextStepPos</H3>
<PRE>
public int <B>getNextStepPos</B>(int opPos)</PRE>
<DL>
<DD>Given a location step position, return the end position, i.e. the
beginning of the next step.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>opPos</CODE> - the position of a location step.<DT><B>Returns:</B><DD>the position of the next location step.</DL>
</DD>
</DL>
<HR>
<A NAME="getNextOpPos(int[], int)"><!-- --></A><H3>
getNextOpPos</H3>
<PRE>
public static int <B>getNextOpPos</B>(int[] opMap,
int opPos)</PRE>
<DL>
<DD>Given an operation position, return the end position, i.e. the
beginning of the next operation.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>opMap</CODE> - The operations map.<DD><CODE>opPos</CODE> - index to operation, for which there is a size entry following.<DT><B>Returns:</B><DD>position of next operation in m_opMap.</DL>
</DD>
</DL>
<HR>
<A NAME="getFirstPredicateOpPos(int)"><!-- --></A><H3>
getFirstPredicateOpPos</H3>
<PRE>
public int <B>getFirstPredicateOpPos</B>(int opPos)</PRE>
<DL>
<DD>Given an FROM_stepType position, return the position of the
first predicate, if there is one, or else this will point
to the end of the FROM_stepType.
Example:
int posOfPredicate = xpath.getNextOpPos(stepPos);
boolean hasPredicates =
OpCodes.OP_PREDICATE == xpath.getOp(posOfPredicate);<DD><DL>
<DT><B>Parameters:</B><DD><CODE>opPos</CODE> - position of FROM_stepType op.<DT><B>Returns:</B><DD>position of predicate in FROM_stepType structure.</DL>
</DD>
</DL>
<HR>
<A NAME="getFirstChildPos(int)"><!-- --></A><H3>
getFirstChildPos</H3>
<PRE>
public static int <B>getFirstChildPos</B>(int opPos)</PRE>
<DL>
<DD>Go to the first child of a given operation.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>opPos</CODE> - position of operation.<DT><B>Returns:</B><DD>The position of the first child of the operation.</DL>
</DD>
</DL>
<HR>
<A NAME="getArgLength(int)"><!-- --></A><H3>
getArgLength</H3>
<PRE>
public int <B>getArgLength</B>(int opPos)</PRE>
<DL>
<DD>Get the length of an operation.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>opPos</CODE> - The position of the operation in the op map.<DT><B>Returns:</B><DD>The size of the operation.</DL>
</DD>
</DL>
<HR>
<A NAME="getArgLengthOfStep(int)"><!-- --></A><H3>
getArgLengthOfStep</H3>
<PRE>
public int <B>getArgLengthOfStep</B>(int opPos)</PRE>
<DL>
<DD>Given a location step, get the length of that step.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>opPos</CODE> - Position of location step in op map.<DT><B>Returns:</B><DD>The length of the step.</DL>
</DD>
</DL>
<HR>
<A NAME="getFirstChildPosOfStep(int)"><!-- --></A><H3>
getFirstChildPosOfStep</H3>
<PRE>
public static int <B>getFirstChildPosOfStep</B>(int opPos)</PRE>
<DL>
<DD>Get the first child position of a given location step.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>opPos</CODE> - Position of location step in the location map.<DT><B>Returns:</B><DD>The first child position of the step.</DL>
</DD>
</DL>
<HR>
<A NAME="getStepTestType(int)"><!-- --></A><H3>
getStepTestType</H3>
<PRE>
public int <B>getStepTestType</B>(int opPosOfStep)</PRE>
<DL>
<DD>Get the test type of the step, i.e. NODETYPE_XXX value.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>opPosOfStep</CODE> - The position of the FROM_XXX step.<DT><B>Returns:</B><DD>NODETYPE_XXX value.</DL>
</DD>
</DL>
<HR>
<A NAME="getStepNS(int)"><!-- --></A><H3>
getStepNS</H3>
<PRE>
public java.lang.String <B>getStepNS</B>(int opPosOfStep)</PRE>
<DL>
<DD>Get the namespace of the step.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>opPosOfStep</CODE> - The position of the FROM_XXX step.<DT><B>Returns:</B><DD>The step's namespace, NodeTest.WILD, or null for null namespace.</DL>
</DD>
</DL>
<HR>
<A NAME="getStepLocalName(int)"><!-- --></A><H3>
getStepLocalName</H3>
<PRE>
public java.lang.String <B>getStepLocalName</B>(int opPosOfStep)</PRE>
<DL>
<DD>Get the local name of the step.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>opPosOfStep</CODE> - The position of the FROM_XXX step.<DT><B>Returns:</B><DD>OpCodes.EMPTY, OpCodes.ELEMWILDCARD, or the local name.</DL>
</DD>
</DL>
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