net.sf.saxon.trace
Class Location

java.lang.Object
  net.sf.saxon.trace.Location

public class Location
extends Object

This class holds constants identifying different kinds of location in a source stylesheet or query. These constants are used in the getConstructType() method of class InstructionInfo. Some of these locations represent points where the dynamic context changes, and they are therefore recorded as such on the context stack. Some of the locations represent points in the evaluation of a stylesheet (or query or XPath expression) that are notified to the trace listener. Some fulfil both roles.

Any constant used in StandardNames can be used as a Location. Such names are generally used to identify XSLT instructions. They are also used for equivalent constructs in XQuery, for example XSL_ELEMENT is used for a computed element constructor in XQuery. The constants in StandardNames are all in the range 0-1023, so constants defined in this class are outside this range.

The constants in this file are annotated with Q to indicate they can appear in XQuery trace output, T to indicate they can appear in XSLT trace output, and/or C to indicate that they can appear on the dynamic context stack.

Field Summary

static int	BUILT_IN_TEMPLATE An XSLT built-in template rule.
static int	CASE_EXPRESSION CASE clause within "typeswitch".
static int	CONTROLLER The outer system environment, identified as the caller of a user query or stylesheet.
static int	DEFAULT_EXPRESSION DEFAULT clause within "typeswitch".
static int	ELSE_EXPRESSION An XPath or XQuery "else" clause.
static int	EXTENSION_INSTRUCTION An XSLT instruction.
static int	FILTER_EXPRESSION An XPath or XQuery filter expression.
static int	FOR_EXPRESSION An XPath or XQuery "for" clause.
static int	FUNCTION_CALL An XPath function call to a user-defined function.
static int	GROUPING_KEY A grouping key in XSLT.
static int	IF_EXPRESSION An XPath or XQuery "if" expression.
static int	LAZY_EVALUATION Lazy evaluation of an expression (this code is used to identify a context created as a saved copy of an existing context, to be stored in a Closure).
static int	LET_EXPRESSION An XQuery "let" clause, or an XSLT local variable (which compiles into a LET clause).
static int	LITERAL_RESULT_ATTRIBUTE An attribute of an XSLT literal result element or of an XQuery direct element constructor.
static int	LITERAL_RESULT_ELEMENT An XSLT literal result element, or an XQuery direct element constructor.
static int	ORDER_BY_CLAUSE An order-by clause in a FLWOR expression.
static int	PATH_EXPRESSION An XPath or XQuery path expression.
static int	PATTERN An XSLT Pattern.
static int	RETURN_EXPRESSION An XPath or XQuery "return" clause.
static int	SAXON_EVALUATE An XPath expression constructed dynamically using saxon:evaluate (or saxon:expression).
static int	SAXON_HIGHER_ORDER_EXTENSION_FUNCTION A higher-order extension function such as saxon:sum, saxon:highest.
static int	SAXON_SERIALIZE The saxon:serialize() extension function.
static int	SORT_KEY A sort key (or order-by key).
static int	THEN_EXPRESSION An XPath or XQuery "then" clause.
static int	TRACE_CALL An explicit call of the fn:trace() function.
static int	TYPESWITCH_EXPRESSION An XPath or XQuery "typeswitch" expression.
static int	UNCLASSIFIED Unclassified location.
static int	VALIDATE_EXPRESSION An XPath or XQuery "validate" expression.
static int	WHERE_CLAUSE A WHERE clause in a FLWOR expression.
static int	XPATH_EXPRESSION XPath expression, otherwise unclassified.
static int	XPATH_IN_XSLT Entry point to a top-level XPath expression within an XSLT stylesheet.

Method Summary

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

CONTROLLER

public static final int CONTROLLER

The outer system environment, identified as the caller of a user query or stylesheet. Usage:C

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Constant Field Values

EXTENSION_INSTRUCTION

public static final int EXTENSION_INSTRUCTION

An XSLT instruction. The name of the instruction (which may be an extension instruction) can be obtained using the fingerprint property. Usage:T

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Constant Field Values

LITERAL_RESULT_ELEMENT

public static final int LITERAL_RESULT_ELEMENT

An XSLT literal result element, or an XQuery direct element constructor. Usage:QT

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LITERAL_RESULT_ATTRIBUTE

public static final int LITERAL_RESULT_ATTRIBUTE

An attribute of an XSLT literal result element or of an XQuery direct element constructor. Usage: QT

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Constant Field Values

FUNCTION_CALL

public static final int FUNCTION_CALL

An XPath function call to a user-defined function. The "expression" property references the actual expression, of class ComputedExpression. The "target" property references the function being called, of class UserFunction. Usage: QTC

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Constant Field Values

BUILT_IN_TEMPLATE

public static final int BUILT_IN_TEMPLATE

An XSLT built-in template rule. Usage: TC

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Constant Field Values

XPATH_IN_XSLT

public static final int XPATH_IN_XSLT

Entry point to a top-level XPath expression within an XSLT stylesheet. Usage: TC

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Constant Field Values

FOR_EXPRESSION

public static final int FOR_EXPRESSION

An XPath or XQuery "for" clause. Usage: Q

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Constant Field Values

LET_EXPRESSION

public static final int LET_EXPRESSION

An XQuery "let" clause, or an XSLT local variable (which compiles into a LET clause). Usage: Q,T

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Constant Field Values

RETURN_EXPRESSION

public static final int RETURN_EXPRESSION

An XPath or XQuery "return" clause. Usage: Q

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Constant Field Values

IF_EXPRESSION

public static final int IF_EXPRESSION

An XPath or XQuery "if" expression. Usage: Q

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Constant Field Values

THEN_EXPRESSION

public static final int THEN_EXPRESSION

An XPath or XQuery "then" clause. Usage: Q

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Constant Field Values

ELSE_EXPRESSION

public static final int ELSE_EXPRESSION

An XPath or XQuery "else" clause. Usage: Q

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Constant Field Values

WHERE_CLAUSE

public static final int WHERE_CLAUSE

A WHERE clause in a FLWOR expression. Usage: Q

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Constant Field Values

ORDER_BY_CLAUSE

public static final int ORDER_BY_CLAUSE

An order-by clause in a FLWOR expression. Usage: Q

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Constant Field Values

TYPESWITCH_EXPRESSION

public static final int TYPESWITCH_EXPRESSION

An XPath or XQuery "typeswitch" expression. Usage: Q

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Constant Field Values

CASE_EXPRESSION

public static final int CASE_EXPRESSION

CASE clause within "typeswitch". Usage: Q

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DEFAULT_EXPRESSION

public static final int DEFAULT_EXPRESSION

DEFAULT clause within "typeswitch". Usage: Q

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VALIDATE_EXPRESSION

public static final int VALIDATE_EXPRESSION

An XPath or XQuery "validate" expression. Usage: Q

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FILTER_EXPRESSION

public static final int FILTER_EXPRESSION

An XPath or XQuery filter expression. Usage: C

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Constant Field Values

PATH_EXPRESSION

public static final int PATH_EXPRESSION

An XPath or XQuery path expression. Usage: C

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Constant Field Values

TRACE_CALL

public static final int TRACE_CALL

An explicit call of the fn:trace() function. Usage: QT

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Constant Field Values

SAXON_EVALUATE

public static final int SAXON_EVALUATE

An XPath expression constructed dynamically using saxon:evaluate (or saxon:expression). Usage: QTC

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Constant Field Values

SAXON_HIGHER_ORDER_EXTENSION_FUNCTION

public static final int SAXON_HIGHER_ORDER_EXTENSION_FUNCTION

A higher-order extension function such as saxon:sum, saxon:highest. Usage: C

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Constant Field Values

SAXON_SERIALIZE

public static final int SAXON_SERIALIZE

The saxon:serialize() extension function. Usage: C

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Constant Field Values

SORT_KEY

public static final int SORT_KEY

A sort key (or order-by key). Usage: C

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Constant Field Values

GROUPING_KEY

public static final int GROUPING_KEY

A grouping key in XSLT. Usage: C

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Constant Field Values

LAZY_EVALUATION

public static final int LAZY_EVALUATION

Lazy evaluation of an expression (this code is used to identify a context created as a saved copy of an existing context, to be stored in a Closure). Usage: C

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Constant Field Values

PATTERN

public static final int PATTERN

An XSLT Pattern. Usage: C

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Constant Field Values

XPATH_EXPRESSION

public static final int XPATH_EXPRESSION

XPath expression, otherwise unclassified. The "expression" property references the actual expression, of class ComputedExpression. Used in fallback cases only.

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UNCLASSIFIED

public static final int UNCLASSIFIED

Unclassified location. Used in fallback cases only.

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