scala.reflect.internal.Trees

EmptyTree

object EmptyTree extends Tree with TermTree with Product with Serializable

The empty tree

Definition Classes
TreesTrees
Source
Trees.scala
Linear Supertypes
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Inherited
  1. EmptyTree
  2. Serializable
  3. Serializable
  4. TermTree
  5. TermTreeApi
  6. Tree
  7. TreeContextApiImpl
  8. TreeContextApi
  9. TreeApi
  10. TreeBase
  11. Product
  12. Equals
  13. AnyRef
  14. Any
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Value Members

  1. final def !=(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  2. final def !=(arg0: Any): Boolean

    Test two objects for inequality.

    Test two objects for inequality.

    returns

    true if !(this == that), false otherwise.

    Definition Classes
    Any
  3. final def ##(): Int

    Equivalent to x.hashCode except for boxed numeric types and null.

    Equivalent to x.hashCode except for boxed numeric types and null. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For null returns a hashcode where null.hashCode throws a NullPointerException.

    returns

    a hash value consistent with ==

    Definition Classes
    AnyRef → Any
  4. final def ==(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  5. final def ==(arg0: Any): Boolean

    Test two objects for equality.

    Test two objects for equality. The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Definition Classes
    Any
  6. def addAttachment(attachment: Any): scala.reflect.internal.Trees.EmptyTree.type

    .

    ...

    Definition Classes
    TreeTreeContextApi
  7. final def asInstanceOf[T0]: T0

    Cast the receiver object to be of type T0.

    Cast the receiver object to be of type T0.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expression List(1).asInstanceOf[List[String]] will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown
    ClassCastException

    if the receiver object is not an instance of the erasure of type T0.

  8. def attachments: Attachments { type Pos = Trees.this.Position }

    .

    ...

    Definition Classes
    TreeTreeContextApi
  9. def changeOwner(pairs: (Symbol, Symbol)*): Tree

    Definition Classes
    TreeContextApiImpl
  10. def children: List[Tree]

    The direct child trees of this tree.

    The direct child trees of this tree. EmptyTrees are always omitted. Lists are flattened.

    Definition Classes
    TreeContextApiImplTreeApi
  11. def clone(): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()
    Note

    not specified by SLS as a member of AnyRef

  12. def collect[T](pf: PartialFunction[Tree, T]): List[T]

    Apply pf' to each subtree on which the function is defined and collect the results.

    Apply pf' to each subtree on which the function is defined and collect the results.

    Definition Classes
    TreeContextApiImplTreeApi
  13. def correspondsStructure(that: Tree)(f: (Tree, Tree) ⇒ Boolean): Boolean

    Definition Classes
    TreeContextApiImpl
  14. def defineType(tp: Type): scala.reflect.internal.Trees.EmptyTree.type

    Like setType, but if this is a previously empty TypeTree that fact is remembered so that resetAllAttrs will snap back.

    Like setType, but if this is a previously empty TypeTree that fact is remembered so that resetAllAttrs will snap back.

    Definition Classes
    TreeTreeContextApi
  15. def duplicate: scala.reflect.internal.Trees.EmptyTree.type

    Make a copy of this tree, keeping all attributes, except that all positions are focused (so nothing in this tree will be found when searching by position).

    Make a copy of this tree, keeping all attributes, except that all positions are focused (so nothing in this tree will be found when searching by position).

    Definition Classes
    TreeTreeApi
  16. final def eq(arg0: AnyRef): Boolean

    Tests whether the argument (arg0) is a reference to the receiver object (this).

    Tests whether the argument (arg0) is a reference to the receiver object (this).

    The eq method implements an equivalence relation on non-null instances of AnyRef, and has three additional properties:

    • It is consistent: for any non-null instances x and y of type AnyRef, multiple invocations of x.eq(y) consistently returns true or consistently returns false.
    • For any non-null instance x of type AnyRef, x.eq(null) and null.eq(x) returns false.
    • null.eq(null) returns true.

    When overriding the equals or hashCode methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).

    returns

    true if the argument is a reference to the receiver object; false otherwise.

    Definition Classes
    AnyRef
  17. def equals(that: Any): Boolean

    The universal equality method defined in AnyRef.

    The universal equality method defined in AnyRef.

    that

    the object to compare against this object for equality.

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Definition Classes
    TreeEquals → AnyRef → Any
  18. def equalsStructure(that: Tree): Boolean

    Tests whether two trees are structurall equal.

    Tests whether two trees are structurall equal. Note that == on trees is reference equality.

    Definition Classes
    TreeContextApiImplTreeApi
  19. def exists(p: (Tree) ⇒ Boolean): Boolean

    Is there exists a part of this tree which satisfies predicate p?

    Is there exists a part of this tree which satisfies predicate p?

    Definition Classes
    TreeContextApiImplTreeApi
  20. def filter(f: (Tree) ⇒ Boolean): List[Tree]

    Find all subtrees matching predicate p.

    Find all subtrees matching predicate p. Same as withFilter

    Definition Classes
    TreeContextApiImplTreeApi
  21. def finalize(): Unit

    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the finalize method is invoked, as well as the interaction between finalize and non-local returns and exceptions, are all platform dependent.

    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()
    Note

    not specified by SLS as a member of AnyRef

  22. def find(p: (Tree) ⇒ Boolean): Option[Tree]

    Returns optionally first tree (in a preorder traversal) which satisfies predicate p, or None if none exists.

    Returns optionally first tree (in a preorder traversal) which satisfies predicate p, or None if none exists.

    Definition Classes
    TreeContextApiImplTreeApi
  23. def forAll(p: (Tree) ⇒ Boolean): Boolean

    Do all parts of this tree satisfy predicate p?

    Do all parts of this tree satisfy predicate p?

    Definition Classes
    TreeContextApiImplTreeApi
  24. def foreach(f: (Tree) ⇒ Unit): Unit

    Apply f to each subtree

    Apply f to each subtree

    Definition Classes
    TreeContextApiImplTreeApi
  25. def foreachPartial(pf: PartialFunction[Tree, Tree]): Unit

    If pf is defined for a given subtree, call super.

    If pf is defined for a given subtree, call super.traverse(pf(tree)), otherwise super.traverse(tree).

    Definition Classes
    TreeContextApiImpl
  26. def freeTerms: List[FreeTermSymbol]

    Extracts free term symbols from a tree that is reified or contains reified subtrees.

    Extracts free term symbols from a tree that is reified or contains reified subtrees.

    Definition Classes
    TreeContextApiImplTreeApi
  27. def freeTypes: List[FreeTypeSymbol]

    Extracts free type symbols from a tree that is reified or contains reified subtrees.

    Extracts free type symbols from a tree that is reified or contains reified subtrees.

    Definition Classes
    TreeContextApiImplTreeApi
  28. final def getClass(): Class[_]

    A representation that corresponds to the dynamic class of the receiver object.

    A representation that corresponds to the dynamic class of the receiver object.

    The nature of the representation is platform dependent.

    returns

    a representation that corresponds to the dynamic class of the receiver object.

    Definition Classes
    AnyRef → Any
    Note

    not specified by SLS as a member of AnyRef

  29. def hasSymbol: Boolean

    .

    ...

    Definition Classes
    TreeTreeApi
  30. def hasSymbolWhich(f: (Symbol) ⇒ Boolean): Boolean

    Definition Classes
    TreeContextApiImpl
  31. def hashCode(): Int

    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in Any.

    returns

    the hash code value for this object.

    Definition Classes
    Tree → AnyRef → Any
  32. val id: Int

    Definition Classes
    Tree
  33. def isDef: Boolean

    .

    ...

    Definition Classes
    TreeTreeBase
  34. def isEmpty: Boolean

    .

    ...

    Definition Classes
    EmptyTreeTreeTreeBase
  35. def isErroneous: Boolean

    Definition Classes
    TreeContextApiImpl
  36. def isErrorTyped: Boolean

    Definition Classes
    TreeContextApiImpl
  37. final def isInstanceOf[T0]: Boolean

    Test whether the dynamic type of the receiver object is T0.

    Test whether the dynamic type of the receiver object is T0.

    Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression 1.isInstanceOf[String] will return false, while the expression List(1).isInstanceOf[List[String]] will return true. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.

    returns

    true if the receiver object is an instance of erasure of type T0; false otherwise.

    Definition Classes
    Any
  38. def isTerm: Boolean

    The canonical way to test if a Tree represents a term.

    The canonical way to test if a Tree represents a term.

    Definition Classes
    TreeTreeBase
  39. def isType: Boolean

    The canonical way to test if a Tree represents a type.

    The canonical way to test if a Tree represents a type.

    Definition Classes
    TreeTreeBase
  40. def isTyped: Boolean

    Definition Classes
    TreeContextApiImpl
  41. def modifyType(f: (Type) ⇒ Type): Tree

    Sets the tree's type to the result of the given function.

    Sets the tree's type to the result of the given function. If the type is null, it remains null - the function is not called.

    Definition Classes
    TreeContextApiImpl
  42. final def ne(arg0: AnyRef): Boolean

    Equivalent to !(this eq that).

    Equivalent to !(this eq that).

    returns

    true if the argument is not a reference to the receiver object; false otherwise.

    Definition Classes
    AnyRef
  43. final def notify(): Unit

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Note

    not specified by SLS as a member of AnyRef

  44. final def notifyAll(): Unit

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Note

    not specified by SLS as a member of AnyRef

  45. def orElse(alt: ⇒ Tree): Tree

    Provides an alternate if tree is empty

    Provides an alternate if tree is empty

    alt

    The alternate tree

    returns

    If this tree is non empty, this tree, otherwise alt.

    Definition Classes
    TreeContextApiImplTreeApi
  46. final def pos: Position

    .

    ...

    Definition Classes
    TreeTreeApi
    Annotations
    @inline()
  47. def pos_=(pos: Position): Unit

    .

    ...

    Definition Classes
    TreeTreeContextApi
  48. def removeAttachment[T](implicit arg0: ClassTag[T]): scala.reflect.internal.Trees.EmptyTree.type

    .

    ...

    Definition Classes
    TreeTreeContextApi
  49. def setPos(newpos: Position): scala.reflect.internal.Trees.EmptyTree.type

    .

    ...

    Definition Classes
    TreeTreeContextApi
  50. def setSymbol(sym: Symbol): scala.reflect.internal.Trees.EmptyTree.type

    .

    ...

    Definition Classes
    TreeTreeContextApi
  51. def setType(tp: Type): scala.reflect.internal.Trees.EmptyTree.type

    Set tpe to give tp and return this.

    Set tpe to give tp and return this.

    Definition Classes
    TreeTreeContextApi
  52. def shallowDuplicate: Tree

    Definition Classes
    TreeContextApiImpl
  53. def shortClass: String

    Definition Classes
    TreeContextApiImpl
  54. def substituteSymbols(from: List[Symbol], to: List[Symbol]): Tree

    Substitute symbols in to for corresponding occurrences of references to symbols from in this type.

    Substitute symbols in to for corresponding occurrences of references to symbols from in this type.

    Definition Classes
    TreeContextApiImplTreeApi
  55. def substituteThis(clazz: Symbol, to: Tree): Tree

    Substitute given tree to for occurrences of nodes that represent C.this, where C referes to the given class clazz.

    Substitute given tree to for occurrences of nodes that represent C.this, where C referes to the given class clazz.

    Definition Classes
    TreeContextApiImplTreeApi
  56. def substituteTypes(from: List[Symbol], to: List[Type]): Tree

    Substitute types in to for corresponding occurrences of references to symbols from in this tree.

    Substitute types in to for corresponding occurrences of references to symbols from in this tree.

    Definition Classes
    TreeContextApiImplTreeApi
  57. def summaryString: String

    When you want to know a little more than the class, but a lot less than the whole tree.

    When you want to know a little more than the class, but a lot less than the whole tree.

    Definition Classes
    TreeContextApiImpl
  58. def symbol: Symbol

    Note that symbol is fixed as null at this level.

    Note that symbol is fixed as null at this level. In SymTrees, it is overridden and implemented with a var, initialized to NoSymbol.

    Trees which are not SymTrees but which carry symbols do so by overriding def symbol to forward it elsewhere. Examples:

    Super(qual, _) // has qual's symbol Apply(fun, args) // has fun's symbol TypeApply(fun, args) // has fun's symbol AppliedTypeTree(tpt, args) // has tpt's symbol TypeTree(tpe) // has tpe's typeSymbol, if tpe != null

    Attempting to set the symbol of a Tree which does not support it will induce an exception.

    Definition Classes
    TreeTreeApi
  59. def symbol_=(sym: Symbol): Unit

    .

    ...

    Definition Classes
    TreeTreeContextApi
  60. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef
  61. def toString(): String

    Obtains string representation of a tree

    Obtains string representation of a tree

    returns

    a String representation of the object.

    Definition Classes
    TreeBase → AnyRef → Any
  62. final def tpe: Type

    .

    ...

    Definition Classes
    TreeTreeApi
    Annotations
    @inline()
  63. def tpe_=(t: Type): Unit

    .

    ...

    Definition Classes
    EmptyTreeTreeTreeContextApi
  64. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()
  65. final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()
  66. final def wait(arg0: Long): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()
  67. def withFilter(f: (Tree) ⇒ Boolean): List[Tree]

    Find all subtrees matching predicate p.

    Find all subtrees matching predicate p. Same as filter

    Definition Classes
    TreeContextApiImplTreeApi

Inherited from Serializable

Inherited from Serializable

Inherited from TermTree

Inherited from TermTreeApi

Inherited from Tree

Inherited from TreeContextApiImpl

Inherited from TreeContextApi

Inherited from TreeApi

Inherited from TreeBase

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any