gnu.xquery.util
Class OrderedMap

java.lang.Object
  gnu.mapping.Procedure
      gnu.mapping.ProcedureN
          gnu.mapping.MethodProc
              gnu.xquery.util.OrderedMap

All Implemented Interfaces:

CanInline, Inlineable, Named

public class OrderedMap
extends MethodProc
implements CanInline, Inlineable

A procedure used to represent a FLWOR expression with an order by clause. (ValuesMap is used for FLWOR expression that don't have an order by clause.) As returned by the parser:

 for $x1 in exp1, $x2 in exp2 where cond order by comparator1 ... return body
 

is represented as

 ordered-map(tuple-sequence, body-function,
             comparator-function1, flags1, collation1, ...)
 

Here tuple-sequence is an expression that returns a sequence of tuples, which are currently implemnted as Java Object[] arrays. After inlining we get:

 ordered-map(tuple-sequence.
   OrderedTuples.make$V(body-function,
     new Object[]{comparator-function1, flags1, collation1, ...}))
 

A future optimization would be to create an instance of a new sub-class of OrderedTuples. Then the body-function and comparator-functions could be compiled as methods to that class. That wins especially if it saves us having to create extra frame classes.

Field Summary

static OrderedMap

orderedMap

Fields inherited from class gnu.mapping.MethodProc

argTypes, NO_MATCH, NO_MATCH_AMBIGUOUS, NO_MATCH_BAD_TYPE, NO_MATCH_TOO_FEW_ARGS, NO_MATCH_TOO_MANY_ARGS

Fields inherited from class gnu.mapping.ProcedureN

noArgs

Constructor Summary

OrderedMap()

Method Summary

void	apply(CallContext ctx) Call this Procedure using the explicit-CallContext-convention.
void	compile(ApplyExp exp, Compilation comp, Target target)
Type	getReturnType(Expression[] args)
Expression	inline(ApplyExp exp, ExpWalker walker) Inline an application of this Procedure and return result.
static java.lang.Object[]	makeTuple$V(java.lang.Object[] values)

Methods inherited from class gnu.mapping.MethodProc

applyN, getParameterType, isApplicable, matchFailAsException, mostSpecific, mostSpecific, numParameters, resolveParameterTypes

Methods inherited from class gnu.mapping.ProcedureN

apply0, apply1, apply2, apply3, apply4

Methods inherited from class gnu.mapping.Procedure

apply, check0, check1, check2, check3, check4, checkArgCount, checkN, getName, getProperty, getSetter, getSymbol, match0, match1, match2, match3, match4, matchN, maxArgs, minArgs, name, numArgs, removeProperty, set0, set1, setN, setName, setProperty, setProperty, setSetter, setSymbol, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

orderedMap

public static final OrderedMap orderedMap

Constructor Detail

OrderedMap

public OrderedMap()

Method Detail

makeTuple$V

public static java.lang.Object[] makeTuple$V(java.lang.Object[] values)

inline

public Expression inline(ApplyExp exp,
                         ExpWalker walker)

Description copied from interface: CanInline

Inline an application of this Procedure and return result. Can return original expression.

Specified by:

inline in interface CanInline

apply

public void apply(CallContext ctx)
           throws java.lang.Throwable

Description copied from class: Procedure

Call this Procedure using the explicit-CallContext-convention. The input arguments are (by default) in stack.args; the result is written to ctx.consumer.

Overrides:

apply in class Procedure

Throws:

java.lang.Throwable

compile

public void compile(ApplyExp exp,
                    Compilation comp,
                    Target target)

Specified by:

compile in interface Inlineable

getReturnType

public Type getReturnType(Expression[] args)

Specified by:

getReturnType in interface Inlineable