org.apache.xpath.compiler
Class OpCodes

java.lang.Object
  org.apache.xpath.compiler.OpCodes

public class OpCodes

extends Object

Operations codes for XPath. Code for the descriptions of the operations codes: [UPPER CASE] indicates a literal value, [lower case] is a description of a value, ([length] always indicates the length of the operation, including the operations code and the length integer.) {UPPER CASE} indicates the given production, {description} is the description of a new production, (For instance, {boolean expression} means some expression that should be resolved to a boolean.) * means that it occurs zero or more times, + means that it occurs one or more times, ? means that it is optional. returns: indicates what the production should return.

Field Summary

static int	AXES_END_TYPES The end of the axes types.
static int	AXES_START_TYPES [FROM_stepType] [length, including predicates] [length of just the step, without the predicates] {node test} {predicates}?
static int	ELEMWILDCARD [ELEMWILDCARD] Means ELEMWILDCARD ("*"), used instead of string index in some places.
static int	EMPTY [EMPTY] Empty slot to indicate NULL.
static int	ENDOP [ENDOP] Some operators may like to have a terminator.
(package private) static int	FIRST_NODESET_OP The low opcode for nodesets, needed by getFirstPredicateOpPos and getNextStepPos.
static int	FROM_ANCESTORS ancestor axes opcode.
static int	FROM_ANCESTORS_OR_SELF ancestor-or-self axes opcode.
static int	FROM_ATTRIBUTES attribute axes opcode.
static int	FROM_CHILDREN children axes opcode.
static int	FROM_DESCENDANTS descendants axes opcode.
static int	FROM_DESCENDANTS_OR_SELF descendants-of-self axes opcode.
static int	FROM_FOLLOWING following axes opcode.
static int	FROM_FOLLOWING_SIBLINGS following-siblings axes opcode.
static int	FROM_NAMESPACE namespace axes opcode.
static int	FROM_PARENT parent axes opcode.
static int	FROM_PRECEDING preceding axes opcode.
static int	FROM_PRECEDING_SIBLINGS preceding-sibling axes opcode.
static int	FROM_ROOT '/' axes opcode.
static int	FROM_SELF self axes opcode.
(package private) static int	LAST_NODESET_OP The last opcode for stuff that can be a nodeset.
static int	MATCH_ANY_ANCESTOR For match patterns.
static int	MATCH_ATTRIBUTE For match patterns.
static int	MATCH_IMMEDIATE_ANCESTOR For match patterns.
private static int	NEXT_FREE_ID The next free ID.
static int	NODENAME [NODENAME] [index to ns token or EMPTY] [index to name token] returns: XBoolean
static int	NODETYPE_ANYELEMENT [NODETYPE_ANY] No size or arguments.
static int	NODETYPE_COMMENT [NODETYPE_COMMENT] No size or arguments.
static int	NODETYPE_FUNCTEST [NODETYPE_ANY] No size or arguments.
static int	NODETYPE_NODE [NODETYPE_NODE] No size or arguments.
static int	NODETYPE_PI [NODETYPE_PI] [index to token] Note: must not overlap function OP number!
static int	NODETYPE_ROOT [NODETYPE_ROOT] No size or arguments.
static int	NODETYPE_TEXT [NODETYPE_TEXT] No size or arguments.
static int	OP_AND [OP_AND] [length] {boolean expression} {boolean expression} returns: XBoolean
static int	OP_ARGUMENT [OP_ARGUMENT] (Function argument.)
static int	OP_BOOL [OP_BOOL] (cast operation) [length] {expression} returns: XBoolean
static int	OP_DIV [OP_DIV] [length] {number expression} {number expression} returns: XNumber
static int	OP_EQUALS [OP_EQUALS] [length] {expression} {expression} returns: XBoolean
static int	OP_EXTFUNCTION [OP_EXTFUNCTION] (Extension function.)
static int	OP_FUNCTION [OP_FUNCTION] [length] [FUNC_name] {OP_ARGUMENT} [ENDOP] returns: XNodeSet XNumber XString XBoolean XRTree XObject
static int	OP_GROUP [OP_GROUP] [length] {expression} returns: XNodeSet XNumber XString XBoolean XRTree XObject
static int	OP_GT [OP_GT] (greater-than) [length] {number expression} {number expression} returns: XBoolean
static int	OP_GTE [OP_GTE] (greater-than-or-equals) [length] {number expression} {number expression} returns: XBoolean
static int	OP_LITERAL [OP_LITERAL] [3] [index to token] returns: XString
static int	OP_LOCATIONPATH [OP_LOCATIONPATH] [length] {FROM_stepType} | {function} {predicate} [ENDOP] (Note that element and attribute namespaces and names can be wildcarded '*'.)
static int	OP_LOCATIONPATHPATTERN [OP_LOCATIONPATHPATTERN] [length] {FROM_stepType} | {function}{predicate} [ENDOP] returns: XNodeSet
static int	OP_LT [OP_LT] (less-than) [length] {number expression} {number expression} returns: XBoolean
static int	OP_LTE [OP_LTE] (less-than-or-equals) [length] {number expression} {number expression} returns: XBoolean
static int	OP_MATCHPATTERN [OP_MATCHPATTERN] [length] {PathExpr}+ returns: XNodeSet
static int	OP_MINUS [OP_MINUS] [length] {number expression} {number expression} returns: XNumber
static int	OP_MOD [OP_MOD] [length] {number expression} {number expression} returns: XNumber
static int	OP_MULT [OP_MULT] [length] {number expression} {number expression} returns: XNumber
static int	OP_NEG [OP_NEG] [length] {number expression} returns: XNumber
static int	OP_NOTEQUALS [OP_NOTEQUALS] [length] {expression} {expression} returns: XBoolean
static int	OP_NUMBER [OP_NUMBER] (cast operation) [length] {expression} returns: XBoolean
static int	OP_NUMBERLIT [OP_NUMBERLIT] (Number literal
static int	OP_OR [OP_OR] [length] {boolean expression} {boolean expression} returns: XBoolean
static int	OP_PLUS [OP_PLUS] [length] {number expression} {number expression} returns: XNumber
static int	OP_PREDICATE [OP_PREDICATE] [length] {expression} [ENDOP] (For safety) returns: XBoolean or XNumber
static int	OP_QUO [OP_QUO] [length] {number expression} {number expression} returns: XNumber
static int	OP_STRING [OP_STRING] (cast operation) [length] {expression} returns: XString
static int	OP_UNION [OP_UNION] [length] {PathExpr}+ returns: XNodeSet
static int	OP_VARIABLE [OP_VARIABLE] [4] [index to namespace token, or EMPTY] [index to function name token] returns: XString
static int	OP_XPATH [OP_XPATH] [length] {expression} returns: XNodeSet XNumber XString XBoolean XRTree XObject

Constructor Summary

OpCodes()

Methods inherited from class java.lang.Object

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

Field Detail

ENDOP

public static final int ENDOP

[ENDOP] Some operators may like to have a terminator.

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Constant Field Values

EMPTY

public static final int EMPTY

[EMPTY] Empty slot to indicate NULL.

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Constant Field Values

ELEMWILDCARD

public static final int ELEMWILDCARD

[ELEMWILDCARD] Means ELEMWILDCARD ("*"), used instead of string index in some places.

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Constant Field Values

OP_XPATH

public static final int OP_XPATH

[OP_XPATH] [length] {expression} returns: XNodeSet XNumber XString XBoolean XRTree XObject

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Constant Field Values

OP_OR

public static final int OP_OR

[OP_OR] [length] {boolean expression} {boolean expression} returns: XBoolean

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Constant Field Values

OP_AND

public static final int OP_AND

[OP_AND] [length] {boolean expression} {boolean expression} returns: XBoolean

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Constant Field Values

OP_NOTEQUALS

public static final int OP_NOTEQUALS

[OP_NOTEQUALS] [length] {expression} {expression} returns: XBoolean

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Constant Field Values

OP_EQUALS

public static final int OP_EQUALS

[OP_EQUALS] [length] {expression} {expression} returns: XBoolean

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Constant Field Values

OP_LTE

public static final int OP_LTE

[OP_LTE] (less-than-or-equals) [length] {number expression} {number expression} returns: XBoolean

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Constant Field Values

OP_LT

public static final int OP_LT

[OP_LT] (less-than) [length] {number expression} {number expression} returns: XBoolean

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Constant Field Values

OP_GTE

public static final int OP_GTE

[OP_GTE] (greater-than-or-equals) [length] {number expression} {number expression} returns: XBoolean

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OP_GT

public static final int OP_GT

[OP_GT] (greater-than) [length] {number expression} {number expression} returns: XBoolean

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Constant Field Values

OP_PLUS

public static final int OP_PLUS

[OP_PLUS] [length] {number expression} {number expression} returns: XNumber

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Constant Field Values

OP_MINUS

public static final int OP_MINUS

[OP_MINUS] [length] {number expression} {number expression} returns: XNumber

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Constant Field Values

OP_MULT

public static final int OP_MULT

[OP_MULT] [length] {number expression} {number expression} returns: XNumber

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Constant Field Values

OP_DIV

public static final int OP_DIV

[OP_DIV] [length] {number expression} {number expression} returns: XNumber

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OP_MOD

public static final int OP_MOD

[OP_MOD] [length] {number expression} {number expression} returns: XNumber

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OP_QUO

public static final int OP_QUO

[OP_QUO] [length] {number expression} {number expression} returns: XNumber

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Constant Field Values

OP_NEG

public static final int OP_NEG

[OP_NEG] [length] {number expression} returns: XNumber

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OP_STRING

public static final int OP_STRING

[OP_STRING] (cast operation) [length] {expression} returns: XString

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OP_BOOL

public static final int OP_BOOL

[OP_BOOL] (cast operation) [length] {expression} returns: XBoolean

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OP_NUMBER

public static final int OP_NUMBER

[OP_NUMBER] (cast operation) [length] {expression} returns: XBoolean

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OP_UNION

public static final int OP_UNION

[OP_UNION] [length] {PathExpr}+ returns: XNodeSet

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OP_LITERAL

public static final int OP_LITERAL

[OP_LITERAL] [3] [index to token] returns: XString

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Constant Field Values

FIRST_NODESET_OP

static final int FIRST_NODESET_OP

The low opcode for nodesets, needed by getFirstPredicateOpPos and getNextStepPos.

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Constant Field Values

OP_VARIABLE

public static final int OP_VARIABLE

[OP_VARIABLE] [4] [index to namespace token, or EMPTY] [index to function name token] returns: XString

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Constant Field Values

OP_GROUP

public static final int OP_GROUP

[OP_GROUP] [length] {expression} returns: XNodeSet XNumber XString XBoolean XRTree XObject

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OP_EXTFUNCTION

public static final int OP_EXTFUNCTION

[OP_EXTFUNCTION] (Extension function.) [length] [index to namespace token] [index to function name token] {OP_ARGUMENT} returns: XNodeSet XNumber XString XBoolean XRTree XObject

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Constant Field Values

OP_FUNCTION

public static final int OP_FUNCTION

[OP_FUNCTION] [length] [FUNC_name] {OP_ARGUMENT} [ENDOP] returns: XNodeSet XNumber XString XBoolean XRTree XObject

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Constant Field Values

LAST_NODESET_OP

static final int LAST_NODESET_OP

The last opcode for stuff that can be a nodeset.

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Constant Field Values

OP_ARGUMENT

public static final int OP_ARGUMENT

[OP_ARGUMENT] (Function argument.) [length] {expression} returns: XNodeSet XNumber XString XBoolean XRTree XObject

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Constant Field Values

OP_NUMBERLIT

public static final int OP_NUMBERLIT

[OP_NUMBERLIT] (Number literal.) [3] [index to token] returns: XString

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OP_LOCATIONPATH

public static final int OP_LOCATIONPATH

[OP_LOCATIONPATH] [length] {FROM_stepType} | {function} {predicate} [ENDOP] (Note that element and attribute namespaces and names can be wildcarded '*'.) returns: XNodeSet

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Constant Field Values

OP_PREDICATE

public static final int OP_PREDICATE

[OP_PREDICATE] [length] {expression} [ENDOP] (For safety) returns: XBoolean or XNumber

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Constant Field Values

OP_MATCHPATTERN

public static final int OP_MATCHPATTERN

[OP_MATCHPATTERN] [length] {PathExpr}+ returns: XNodeSet

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Constant Field Values

OP_LOCATIONPATHPATTERN

public static final int OP_LOCATIONPATHPATTERN

[OP_LOCATIONPATHPATTERN] [length] {FROM_stepType} | {function}{predicate} [ENDOP] returns: XNodeSet

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Constant Field Values

NODETYPE_COMMENT

public static final int NODETYPE_COMMENT

[NODETYPE_COMMENT] No size or arguments. Note: must not overlap function OP number! returns: XBoolean

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Constant Field Values

NODETYPE_TEXT

public static final int NODETYPE_TEXT

[NODETYPE_TEXT] No size or arguments. Note: must not overlap function OP number! returns: XBoolean

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Constant Field Values

NODETYPE_PI

public static final int NODETYPE_PI

[NODETYPE_PI] [index to token] Note: must not overlap function OP number! returns: XBoolean

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Constant Field Values

NODETYPE_NODE

public static final int NODETYPE_NODE

[NODETYPE_NODE] No size or arguments. Note: must not overlap function OP number! returns: XBoolean

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Constant Field Values

NODENAME

public static final int NODENAME

[NODENAME] [index to ns token or EMPTY] [index to name token] returns: XBoolean

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NODETYPE_ROOT

public static final int NODETYPE_ROOT

[NODETYPE_ROOT] No size or arguments. returns: XBoolean

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NODETYPE_ANYELEMENT

public static final int NODETYPE_ANYELEMENT

[NODETYPE_ANY] No size or arguments. returns: XBoolean

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NODETYPE_FUNCTEST

public static final int NODETYPE_FUNCTEST

[NODETYPE_ANY] No size or arguments. returns: XBoolean

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AXES_START_TYPES

public static final int AXES_START_TYPES

[FROM_stepType] [length, including predicates] [length of just the step, without the predicates] {node test} {predicates}? returns: XBoolean

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Constant Field Values

FROM_ANCESTORS

public static final int FROM_ANCESTORS

ancestor axes opcode.

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FROM_ANCESTORS_OR_SELF

public static final int FROM_ANCESTORS_OR_SELF

ancestor-or-self axes opcode.

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FROM_ATTRIBUTES

public static final int FROM_ATTRIBUTES

attribute axes opcode.

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FROM_CHILDREN

public static final int FROM_CHILDREN

children axes opcode.

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FROM_DESCENDANTS

public static final int FROM_DESCENDANTS

descendants axes opcode.

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FROM_DESCENDANTS_OR_SELF

public static final int FROM_DESCENDANTS_OR_SELF

descendants-of-self axes opcode.

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FROM_FOLLOWING

public static final int FROM_FOLLOWING

following axes opcode.

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FROM_FOLLOWING_SIBLINGS

public static final int FROM_FOLLOWING_SIBLINGS

following-siblings axes opcode.

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FROM_PARENT

public static final int FROM_PARENT

parent axes opcode.

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FROM_PRECEDING

public static final int FROM_PRECEDING

preceding axes opcode.

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FROM_PRECEDING_SIBLINGS

public static final int FROM_PRECEDING_SIBLINGS

preceding-sibling axes opcode.

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FROM_SELF

public static final int FROM_SELF

self axes opcode.

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FROM_NAMESPACE

public static final int FROM_NAMESPACE

namespace axes opcode.

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FROM_ROOT

public static final int FROM_ROOT

'/' axes opcode.

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MATCH_ATTRIBUTE

public static final int MATCH_ATTRIBUTE

For match patterns.

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MATCH_ANY_ANCESTOR

public static final int MATCH_ANY_ANCESTOR

For match patterns.

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MATCH_IMMEDIATE_ANCESTOR

public static final int MATCH_IMMEDIATE_ANCESTOR

For match patterns.

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AXES_END_TYPES

public static final int AXES_END_TYPES

The end of the axes types.

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NEXT_FREE_ID

private static final int NEXT_FREE_ID

The next free ID. Please keep this up to date.

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Constant Field Values

Constructor Detail

OpCodes

public OpCodes()