Package org.mozilla.javascript.ast

## Class XmlRef

- java.lang.Object
- - org.mozilla.javascript.Node
  - - org.mozilla.javascript.ast.AstNode
    - - org.mozilla.javascript.ast.XmlRef

- All Implemented Interfaces:
    `java.lang.Comparable<AstNode>`, `java.lang.Iterable<Node>`
  Direct Known Subclasses:
    `XmlElemRef`, `XmlPropRef`

      public abstract class XmlRef
      extends AstNode

  Base class for E4X XML attribute-access or property-get expressions. Such expressions can take a variety of forms. The general syntax has three parts:

  1. optional: an `@`
  (specifying an attribute access)
- optional: a namespace (a `Name`) and double-colon
- required: either a `Name` or a bracketed [expression]
The property-name expressions (examples: `ns::name`, `@name`) are represented as `XmlPropRef` nodes. The bracketed-expression versions (examples: `ns::[name]`, `@[name]`) become `XmlElemRef` nodes.

This node type (or more specifically, its subclasses) will sometimes be the right-hand child of a `PropertyGet` node or an `XmlMemberGet` node. The `XmlRef` node may also be a standalone primary expression with no explicit target, which is valid in certain expression contexts such as `company..employee.(@id &lt; 100)` - in this case, the `@id` is an `XmlRef` that is part of an infix '<' expression whose parent is an `XmlDotQuery` node.

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.mozilla.javascript.ast.AstNode

      `AstNode.DebugPrintVisitor, AstNode.PositionComparator`

    - ### Nested classes/interfaces inherited from class org.mozilla.javascript.Node

      `Node.NodeIterator`

  - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `protected int` | `atPos` |
    `protected int` | `colonPos` |
    `protected Name` | `namespace` |

    - ### Fields inherited from class org.mozilla.javascript.ast.AstNode

      `length, parent, position`

    - ### Fields inherited from class org.mozilla.javascript.Node

      `ARROW_FUNCTION_PROP, ATTRIBUTE_FLAG, BOTH, CASEARRAY_PROP, CATCH_SCOPE_PROP, CONTROL_BLOCK_PROP, DECR_FLAG, DESCENDANTS_FLAG, DESTRUCTURING_ARRAY_LENGTH, DESTRUCTURING_NAMES, DESTRUCTURING_PARAMS, DESTRUCTURING_SHORTHAND, DIRECTCALL_PROP, END_DROPS_OFF, END_RETURNS, END_RETURNS_VALUE, END_UNREACHED, END_YIELDS, EXPRESSION_CLOSURE_PROP, first, FUNCTION_PROP, GENERATOR_END_PROP, INCRDECR_PROP, ISNUMBER_PROP, JSDOC_PROP, LABEL_ID_PROP, last, LAST_PROP, LEFT, lineno, LOCAL_BLOCK_PROP, LOCAL_PROP, MEMBER_TYPE_PROP, NAME_PROP, next, NON_SPECIALCALL, OBJECT_IDS_PROP, PARENTHESIZED_PROP, POST_FLAG, PROPERTY_FLAG, propListHead, REGEXP_PROP, RIGHT, SKIP_INDEXES_PROP, SPECIALCALL_EVAL, SPECIALCALL_PROP, SPECIALCALL_WITH, TARGETBLOCK_PROP, type, VARIABLE_PROP`

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `XmlRef()` |
    `XmlRef​(int pos)` |
    `XmlRef​(int pos, int len)` |

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `int` | `getAtPos()` | Returns position of `@`-token, or -1 if this is not an attribute-access expression.
    `int` | `getColonPos()` | Returns position of `::` token, or -1 if not present.
    `Name` | `getNamespace()` | Return the namespace.
    `boolean` | `isAttributeAccess()` | Returns `true` if this expression began with an `@`-token.
    `void` | `setAtPos​(int atPos)` | Sets position of `@`-token, or -1
    `void` | `setColonPos​(int colonPos)` | Sets position of `::` token, or -1 if not present
    `void` | `setNamespace​(Name namespace)` | Sets namespace, and sets its parent to this node.

    - ### Methods inherited from class org.mozilla.javascript.ast.AstNode

      `addChild, assertNotNull, codeBug, compareTo, debugPrint, depth, getAbsolutePosition, getAstRoot, getEnclosingFunction, getEnclosingScope, getLength, getLineno, getParent, getPosition, hasSideEffects, makeIndent, operatorToString, printList, setBounds, setLength, setParent, setPosition, setRelative, shortName, toSource, toSource, visit`

    - ### Methods inherited from class org.mozilla.javascript.Node

      `addChildAfter, addChildBefore, addChildrenToBack, addChildrenToFront, addChildToBack, addChildToFront, getChildBefore, getDouble, getExistingIntProp, getFirstChild, getIntProp, getJsDoc, getJsDocNode, getLastChild, getLastSibling, getNext, getProp, getScope, getString, getType, hasChildren, hasConsistentReturnUsage, iterator, labelId, labelId, newNumber, newString, newString, newTarget, putIntProp, putProp, removeChild, removeChildren, removeProp, replaceChild, replaceChildAfter, resetTargets, setDouble, setJsDocNode, setLineno, setScope, setString, setType, toString, toStringTree`

    - ### Methods inherited from class java.lang.Object

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

    - ### Methods inherited from interface java.lang.Iterable

      `forEach, spliterator`

- - ### Field Detail

    - #### namespace

          protected Name namespace

    - #### atPos

          protected int atPos

    - #### colonPos

          protected int colonPos

  - ### Constructor Detail

    - #### XmlRef

          public XmlRef()

    - #### XmlRef

          public XmlRef​(int pos)

    - #### XmlRef

          public XmlRef​(int pos,
                        int len)

  - ### Method Detail

    - #### getNamespace

          public Name getNamespace()

      Return the namespace. May be `@null`.

    - #### setNamespace

          public void setNamespace​(Name namespace)

      Sets namespace, and sets its parent to this node. Can be `null`.

    - #### isAttributeAccess

          public boolean isAttributeAccess()

      Returns `true` if this expression began with an `@`-token.

    - #### getAtPos

          public int getAtPos()

      Returns position of `@`-token, or -1 if this is not an attribute-access expression.

    - #### setAtPos

          public void setAtPos​(int atPos)

      Sets position of `@`-token, or -1

    - #### getColonPos

          public int getColonPos()

      Returns position of `::` token, or -1 if not present. It will only be present if the namespace node is non-`null`.

    - #### setColonPos

          public void setColonPos​(int colonPos)

      Sets position of `::` token, or -1 if not present