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## org.apache.xpath.compiler
Class OpCodes

    java.lang.Object
      |
      +--org.apache.xpath.compiler.OpCodes

public class OpCodes
extends java.lang.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}? returns: XBoolean
`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.
`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.
`static int` | `MATCH_ANY_ANCESTOR` For match patterns.
`static int` | `MATCH_ATTRIBUTE` For match patterns.
`static int` | `MATCH_IMMEDIATE_ANCESTOR` For match patterns.
`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! returns: XBoolean
`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.) [length] {expression} returns: XNodeSet XNumber XString XBoolean XRTree XObject
`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.) [length] [index to namespace token] [index to function name token] {OP_ARGUMENT} returns: XNodeSet XNumber XString XBoolean XRTree XObject
`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 '*'.) returns: XNodeSet
`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.) [3] [index to token] returns: XString
`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
`equals, 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.
  Usage:
    **For advanced use only**

### EMPTY

    public static final int EMPTY

  [EMPTY] Empty slot to indicate NULL.

### ELEMWILDCARD

    public static final int ELEMWILDCARD

  [ELEMWILDCARD] Means ELEMWILDCARD ("*"), used instead of string index in some places.
  Usage:
    **For advanced use only**

### OP_XPATH

    public static final int OP_XPATH

  [OP_XPATH] [length] {expression} returns: XNodeSet XNumber XString XBoolean XRTree XObject
  Usage:
    **For advanced use only**

### OP_OR

    public static final int OP_OR

  [OP_OR] [length] {boolean expression} {boolean expression} returns: XBoolean
  Usage:
    **For advanced use only**

### OP_AND

    public static final int OP_AND

  [OP_AND] [length] {boolean expression} {boolean expression} returns: XBoolean
  Usage:
    **For advanced use only**

### OP_NOTEQUALS

    public static final int OP_NOTEQUALS

  [OP_NOTEQUALS] [length] {expression} {expression} returns: XBoolean
  Usage:
    **For advanced use only**

### OP_EQUALS

    public static final int OP_EQUALS

  [OP_EQUALS] [length] {expression} {expression} returns: XBoolean
  Usage:
    **For advanced use only**

### OP_LTE

    public static final int OP_LTE

  [OP_LTE] (less-than-or-equals) [length] {number expression} {number expression} returns: XBoolean
  Usage:
    **For advanced use only**

### OP_LT

    public static final int OP_LT

  [OP_LT] (less-than) [length] {number expression} {number expression} returns: XBoolean
  Usage:
    **For advanced use only**

### OP_GTE

    public static final int OP_GTE

  [OP_GTE] (greater-than-or-equals) [length] {number expression} {number expression} returns: XBoolean
  Usage:
    **For advanced use only**

### OP_GT

    public static final int OP_GT

  [OP_GT] (greater-than) [length] {number expression} {number expression} returns: XBoolean
  Usage:
    **For advanced use only**

### OP_PLUS

    public static final int OP_PLUS

  [OP_PLUS] [length] {number expression} {number expression} returns: XNumber
  Usage:
    **For advanced use only**

### OP_MINUS

    public static final int OP_MINUS

  [OP_MINUS] [length] {number expression} {number expression} returns: XNumber
  Usage:
    **For advanced use only**

### OP_MULT

    public static final int OP_MULT

  [OP_MULT] [length] {number expression} {number expression} returns: XNumber
  Usage:
    **For advanced use only**

### OP_DIV

    public static final int OP_DIV

  [OP_DIV] [length] {number expression} {number expression} returns: XNumber
  Usage:
    **For advanced use only**

### OP_MOD

    public static final int OP_MOD

  [OP_MOD] [length] {number expression} {number expression} returns: XNumber
  Usage:
    **For advanced use only**

### OP_QUO

    public static final int OP_QUO

  [OP_QUO] [length] {number expression} {number expression} returns: XNumber
  Usage:
    **For advanced use only**

### OP_NEG

    public static final int OP_NEG

  [OP_NEG] [length] {number expression} returns: XNumber
  Usage:
    **For advanced use only**

### OP_STRING

    public static final int OP_STRING

  [OP_STRING] (cast operation) [length] {expression} returns: XString
  Usage:
    **For advanced use only**

### OP_BOOL

    public static final int OP_BOOL

  [OP_BOOL] (cast operation) [length] {expression} returns: XBoolean
  Usage:
    **For advanced use only**

### OP_NUMBER

    public static final int OP_NUMBER

  [OP_NUMBER] (cast operation) [length] {expression} returns: XBoolean
  Usage:
    **For advanced use only**

### OP_UNION

    public static final int OP_UNION

  [OP_UNION] [length] {PathExpr}+ returns: XNodeSet
  Usage:
    **For advanced use only**

### OP_LITERAL

    public static final int OP_LITERAL

  [OP_LITERAL] [3] [index to token] returns: XString
  Usage:
    **For advanced use only**

### OP_VARIABLE

    public static final int OP_VARIABLE

  [OP_VARIABLE] [4] [index to namespace token, or EMPTY] [index to function name token] returns: XString
  Usage:
    **For advanced use only**

### OP_GROUP

    public static final int OP_GROUP

  [OP_GROUP] [length] {expression} returns: XNodeSet XNumber XString XBoolean XRTree XObject
  Usage:
    **For advanced use only**

### 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
  Usage:
    **For advanced use only**

### OP_FUNCTION

    public static final int OP_FUNCTION

  [OP_FUNCTION] [length] [FUNC_name] {OP_ARGUMENT} [ENDOP] returns: XNodeSet XNumber XString XBoolean XRTree XObject
  Usage:
    **For advanced use only**

### OP_ARGUMENT

    public static final int OP_ARGUMENT

  [OP_ARGUMENT] (Function argument.) [length] {expression} returns: XNodeSet XNumber XString XBoolean XRTree XObject
  Usage:
    **For advanced use only**

### OP_NUMBERLIT

    public static final int OP_NUMBERLIT

  [OP_NUMBERLIT] (Number literal.) [3] [index to token] returns: XString
  Usage:
    **For advanced use only**

### 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
  Usage:
    **For advanced use only**

### OP_PREDICATE

    public static final int OP_PREDICATE

  [OP_PREDICATE] [length] {expression} [ENDOP] (For safety) returns: XBoolean or XNumber
  Usage:
    **For advanced use only**

### OP_MATCHPATTERN

    public static final int OP_MATCHPATTERN

  [OP_MATCHPATTERN] [length] {PathExpr}+ returns: XNodeSet
  Usage:
    **For advanced use only**

### OP_LOCATIONPATHPATTERN

    public static final int OP_LOCATIONPATHPATTERN

  [OP_LOCATIONPATHPATTERN] [length] {FROM_stepType} | {function}{predicate} [ENDOP] returns: XNodeSet
  Usage:
    **For advanced use only**

### NODETYPE_COMMENT

    public static final int NODETYPE_COMMENT

  [NODETYPE_COMMENT] No size or arguments. Note: must not overlap function OP number! returns: XBoolean
  Usage:
    **For advanced use only**

### NODETYPE_TEXT

    public static final int NODETYPE_TEXT

  [NODETYPE_TEXT] No size or arguments. Note: must not overlap function OP number! returns: XBoolean
  Usage:
    **For advanced use only**

### NODETYPE_PI

    public static final int NODETYPE_PI

  [NODETYPE_PI] [index to token] Note: must not overlap function OP number! returns: XBoolean
  Usage:
    **For advanced use only**

### NODETYPE_NODE

    public static final int NODETYPE_NODE

  [NODETYPE_NODE] No size or arguments. Note: must not overlap function OP number! returns: XBoolean
  Usage:
    **For advanced use only**

### NODENAME

    public static final int NODENAME

  [NODENAME] [index to ns token or EMPTY] [index to name token] returns: XBoolean
  Usage:
    **For advanced use only**

### NODETYPE_ROOT

    public static final int NODETYPE_ROOT

  [NODETYPE_ROOT] No size or arguments. returns: XBoolean
  Usage:
    **For advanced use only**

### NODETYPE_ANYELEMENT

    public static final int NODETYPE_ANYELEMENT

  [NODETYPE_ANY] No size or arguments. returns: XBoolean
  Usage:
    **For advanced use only**

### NODETYPE_FUNCTEST

    public static final int NODETYPE_FUNCTEST

  [NODETYPE_ANY] No size or arguments. returns: XBoolean
  Usage:
    **For advanced use only**

### 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
  Usage:
    **For advanced use only**

### FROM_ANCESTORS

    public static final int FROM_ANCESTORS

  ancestor axes opcode.

### FROM_ANCESTORS_OR_SELF

    public static final int FROM_ANCESTORS_OR_SELF

  ancestor-or-self axes opcode.

### FROM_ATTRIBUTES

    public static final int FROM_ATTRIBUTES

  attribute axes opcode.

### FROM_CHILDREN

    public static final int FROM_CHILDREN

  children axes opcode.

### FROM_DESCENDANTS

    public static final int FROM_DESCENDANTS

  descendants axes opcode.

### FROM_DESCENDANTS_OR_SELF

    public static final int FROM_DESCENDANTS_OR_SELF

  descendants-of-self axes opcode.

### FROM_FOLLOWING

    public static final int FROM_FOLLOWING

  following axes opcode.

### FROM_FOLLOWING_SIBLINGS

    public static final int FROM_FOLLOWING_SIBLINGS

  following-siblings axes opcode.

### FROM_PARENT

    public static final int FROM_PARENT

  parent axes opcode.

### FROM_PRECEDING

    public static final int FROM_PRECEDING

  preceding axes opcode.

### FROM_PRECEDING_SIBLINGS

    public static final int FROM_PRECEDING_SIBLINGS

  preceding-sibling axes opcode.

### FROM_SELF

    public static final int FROM_SELF

  self axes opcode.

### FROM_NAMESPACE

    public static final int FROM_NAMESPACE

  namespace axes opcode.

### FROM_ROOT

    public static final int FROM_ROOT

  '/' axes opcode.

### MATCH_ATTRIBUTE

    public static final int MATCH_ATTRIBUTE

  For match patterns.
  Usage:
    **For advanced use only**

### MATCH_ANY_ANCESTOR

    public static final int MATCH_ANY_ANCESTOR

  For match patterns.
  Usage:
    **For advanced use only**

### MATCH_IMMEDIATE_ANCESTOR

    public static final int MATCH_IMMEDIATE_ANCESTOR

  For match patterns.
  Usage:
    **For advanced use only**

### AXES_END_TYPES

    public static final int AXES_END_TYPES

  The end of the axes types.

Constructor Detail

### OpCodes

    public OpCodes()

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