gnu.kawa.xml
Class TreeScanner

java.lang.Object
  gnu.mapping.PropertySet
      gnu.mapping.Procedure
          gnu.mapping.ProcedureN
              gnu.mapping.MethodProc
                  gnu.kawa.xml.TreeScanner

All Implemented Interfaces:

CanInline, Named, java.io.Externalizable, java.io.Serializable

Direct Known Subclasses:

AncestorAxis, AncestorOrSelfAxis, AttributeAxis, ChildAxis, DescendantAxis, DescendantOrSelfAxis, FollowingAxis, FollowingSiblingAxis, ParentAxis, PrecedingAxis, PrecedingSiblingAxis, SelfAxis

public abstract class TreeScanner
extends MethodProc
implements java.io.Externalizable, CanInline

Abstract class that scans part of a node tree. Takes a node argument, and writes matching "relative" nodes out to a PositionConsumer as a sequence of position pairs. This is uses to implement "path expressions" as in XPath/XSLT/XQuery. For example, the ChildAxis sub-class writes out all child nodes of the argument that match the 'type' NodePredicate.

See Also:

Serialized Form

Field Summary

NodePredicate

type

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

TreeScanner()

Method Summary

void	apply(CallContext ctx) Call this Procedure using the explicit-CallContext-convention.
NodePredicate	getNodePredicate()
Expression	inline(ApplyExp exp, ExpWalker walker) Inline an application of this Procedure and return result.
int	numArgs() Return minArgs()|(maxArgs<<12).
void	readExternal(java.io.ObjectInput in)
abstract void	scan(AbstractSequence seq, int ipos, PositionConsumer out)
java.lang.String	toString()
void	writeExternal(java.io.ObjectOutput out)

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, getSetter, getSourceLocation, match0, match1, match2, match3, match4, matchN, maxArgs, minArgs, set0, set1, setN, setSetter, setSourceLocation

Methods inherited from class gnu.mapping.PropertySet

getName, getProperty, getSymbol, removeProperty, setName, setProperty, setProperty, setSymbol

Methods inherited from class java.lang.Object

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

Field Detail

type

public NodePredicate type

Constructor Detail

TreeScanner

public TreeScanner()

Method Detail

getNodePredicate

public NodePredicate getNodePredicate()

scan

public abstract void scan(AbstractSequence seq,
                          int ipos,
                          PositionConsumer out)

numArgs

public int numArgs()

Description copied from class: Procedure

Return minArgs()|(maxArgs<<12).

Overrides:

numArgs in class Procedure

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

writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Specified by:

writeExternal in interface java.io.Externalizable

Throws:

java.io.IOException

readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException

Specified by:

readExternal in interface java.io.Externalizable

Throws:

java.io.IOException

java.lang.ClassNotFoundException

toString

public java.lang.String toString()

Overrides:

toString in class Procedure

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