scala.collection.mutable

# HashTable

#### trait HashTable[A, Entry >: Null <: HashEntry[A, Entry]] extends HashUtils[A]

This class can be used to construct data structures that are based on hashtables. Class `HashTable[A]` implements a hashtable that maps keys of type `A` to values of the fully abstract member type `Entry`. Classes that make use of `HashTable` have to provide an implementation for `Entry`.

There are mainly two parameters that affect the performance of a hashtable: the initial size and the load factor. The size refers to the number of buckets in the hashtable, and the load factor is a measure of how full the hashtable is allowed to get before its size is automatically doubled. Both parameters may be changed by overriding the corresponding values in class `HashTable`.

A

  type of the elements contained in this hash table.

Source
  HashTable.scala
Version

  2.0, 31/12/2006

Since

  1

Linear Supertypes
HashUtils[A], AnyRef, Any
Known Subclasses
HashMap, LinkedHashMap, ParHashMap, ParHashTable, PicklerEnv, UnPicklerEnv
Ordering

1. Alphabetic
2. By inheritance

Inherited

1. Hide All
2. Show all

1. HashTable
2. HashUtils
3. AnyRef
4. Any

Visibility

1. Public
2. All

### 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.

   Equivalent to `x.hashCode` except for boxed numeric types. 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.

   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.

   returns

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

   Definition Classes
     Any

6. #### var _loadFactor: Int

   Attributes
     protected

7. #### def addEntry(e: Entry): Unit

   Add entry to table pre: no entry with same key exists

   Add entry to table pre: no entry with same key exists

   Attributes
     protected

8. #### def alwaysInitSizeMap: Boolean

   Attributes
     protected

9. #### 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`.

10. #### def calcSizeMapSize(tableLength: Int): Int

    Attributes
      protected

11. #### def clearTable(): Unit

    Remove all entries from table

    Remove all entries from table

    Attributes
      protected

12. #### 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

13. #### def elemEquals(key1: A, key2: A): Boolean

    Attributes
      protected

14. #### def elemHashCode(key: A): Int

    Attributes
      protected
    Definition Classes
      HashUtils

15. #### def entriesIterator: Iterator[Entry]

    An iterator returning all entries.

    An iterator returning all entries.

    Attributes
      protected

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(arg0: Any): Boolean

    The equality method for reference types.

    The equality method for reference types. See equals in Any.

    returns

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

    Definition Classes
      AnyRef → Any

18. #### 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

19. #### def findEntry(key: A): Entry

    Find entry with given key in table, null if not found.

    Find entry with given key in table, null if not found.

    Attributes
      protected

20. #### final def foreachEntry[C](f: (Entry) ⇒ C): Unit

    Attributes
      protected

21. #### final def getClass(): java.lang.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

22. #### 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
      AnyRef → Any

23. #### final def improve(hcode: Int): Int

    Attributes
      protected
    Definition Classes
      HashUtils

24. #### final def index(hcode: Int): Int

    Attributes
      protected

25. #### def initWithContents(c: Contents[A, Entry]): Unit

    Attributes
      protected

26. #### def initialSize: Int

    Attributes
      protected

27. #### 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

28. #### def isSizeMapDefined: Boolean

    Attributes
      protected

29. #### 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

30. #### def nnSizeMapAdd(h: Int): Unit

    Attributes
      protected

31. #### def nnSizeMapRemove(h: Int): Unit

    Attributes
      protected

32. #### def nnSizeMapReset(tableLength: Int): Unit

    Attributes
      protected

33. #### 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

34. #### 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

35. #### def removeEntry(key: A): Entry

    Remove entry from table if present.

    Remove entry from table if present.

    Attributes
      protected

36. #### final def sizeMapBucketBitSize: Int

    Attributes
      protected
    Definition Classes
      HashUtils

37. #### final def sizeMapBucketSize: Int

    Attributes
      protected
    Definition Classes
      HashUtils

38. #### def sizeMapDisable(): Unit

    Attributes
      protected

39. #### def sizeMapInit(tableLength: Int): Unit

    Attributes
      protected

40. #### def sizeMapInitAndRebuild(): Unit

    Attributes
      protected

41. #### var sizemap: Array[Int]

    The array keeping track of the number of elements in 32 element blocks.

    The array keeping track of the number of elements in 32 element blocks.

    Attributes
      protected

42. #### final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
      AnyRef

43. #### var table: Array[HashEntry[A, Entry]]

    The actual hash table.

    The actual hash table.

    Attributes
      protected

44. #### var tableSize: Int

    The number of mappings contained in this hash table.

    The number of mappings contained in this hash table.

    Attributes
      protected

45. #### var threshold: Int

    The next size value at which to resize (capacity * load factor).

    The next size value at which to resize (capacity * load factor).

    Attributes
      protected

46. #### def toString(): String

    Creates a String representation of this object.

    Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

    returns

      a String representation of the object.

    Definition Classes
      AnyRef → Any

47. #### final def wait(): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws()

48. #### final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws()

49. #### final def wait(arg0: Long): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws()

### Deprecated Value Members

1. #### def entries: Iterator[Entry]

   An iterator returning all entries

   An iterator returning all entries

   Attributes
     protected
   Annotations
     @deprecated
   Deprecated

     (Since version 2.8.0) use entriesIterator instead

### Inherited from HashUtils[A]

### Inherited from AnyRef

### Inherited from Any