Scala Library
scala.collection.mutable

class ImmutableMapAdaptor
[source: scala/collection/mutable/ImmutableMapAdaptor.scala]
@serializable

class ImmutableMapAdaptor[A, B](protected val imap : Map[A, B])
extends Map[A, B]
This class can be used as an adaptor to create mutable maps from immutable map implementations. Only method empty has to be redefined if the immutable map on which this mutable map is originally based is not empty. empty is supposed to return the representation of an empty map.
Author
Matthias Zenger
Martin Odersky
Version
2.0, 01/01/2007
Method Summary
def -= (key : A) : Unit
Remove a key from this map, noop if key is not present.
override def apply (key : A) : B
Retrieve the value which is associated with the given key. This method throws an exception if there is no mapping from the given key to a value.
override def clear : Unit
Removes all mappings from the map. After this operation is completed, the map is empty.
override def contains (key : A) : Boolean
Is the given key mapped to a value by this map?
def elements : Iterator[(A, B)]
Creates a new iterator over all elements contained in this object.
def get (key : A) : Option[B]
Check if this map maps key to a value and return the value if it exists.
override def isDefinedAt (key : A) : Boolean
Does this map contain a mapping from the given key to a value?
override def isEmpty : Boolean
Is this an empty map?
override def keySet : Set[A]
override def keys : Iterator[A]
Creates an iterator for all keys.
override def retain (p : (A, B) => Boolean) : Unit
This method retains only those mappings for which the predicate p returns true.
def size : Int
Compute the number of key-to-value mappings.
override def toList : List[(A, B)]
Returns a list containing all of the elements in this iterable object.
override def toString : java.lang.String
Creates a string representation for this map.
override def transform (f : (A, B) => B) : Unit
This function transforms all the values of mappings contained in this map with function f.
def update (key : A, value : B) : Unit
This method allows one to add a new mapping from key to value to the map. If the map already contains a mapping for key, it will be overridden by this function.
override def values : Iterator[B]
Creates an iterator for a contained values.
Methods inherited from Map
+=, +=, ++=, ++=, +, +, ++, ++, -=, --=, --=, -, removeKey, put, -, --, --, getOrElseUpdate, <<, clone, readOnly, +=, incl, excl
Methods inherited from Map
getOrElse, equals, hashCode, default, projection, filterKeys, mapElements, stringPrefix
Methods inherited from Collection
toArray
Methods inherited from Iterable
concat, ++, map, flatMap, filter, partition, takeWhile, dropWhile, take, drop, foreach, forall, exists, find, findIndexOf, indexOf, foldLeft, foldRight, /:, :\, reduceLeft, reduceRight, copyToBuffer, sameElements, toSeq, toStream, mkString, mkString, mkString, addString, addString, addString, copyToArray, hasDefiniteSize
Methods inherited from PartialFunction
orElse, andThen
Methods inherited from Function1
compose
Methods inherited from AnyRef
getClass, notify, notifyAll, wait, wait, wait, finalize, ==, !=, eq, ne, synchronized
Methods inherited from Any
==, !=, isInstanceOf, asInstanceOf
Method Details
def size : Int
Compute the number of key-to-value mappings.
Returns
the number of mappings
def get(key : A) : Option[B]
Check if this map maps key to a value and return the value if it exists.
Parameters
key - the key of the mapping of interest
Returns
the value of the mapping, if it exists
override def isEmpty : Boolean
Is this an empty map?
Returns
true iff the map is empty.
override def apply(key : A) : B
Retrieve the value which is associated with the given key. This method throws an exception if there is no mapping from the given key to a value.
Parameters
key - the key
Returns
the value associated with the given key.
override def contains(key : A) : Boolean
Is the given key mapped to a value by this map?
Parameters
key - the key
Returns
true iff there is a mapping for key in this map
override def isDefinedAt(key : A) : Boolean
Does this map contain a mapping from the given key to a value?
Parameters
key - the key
Returns
true iff there is a mapping for key in this map
override def keys : Iterator[A]
Creates an iterator for all keys.
Returns
an iterator over all keys.
override def keySet : Set[A]
Returns
the keys of this map as a set.
override def values : Iterator[B]
Creates an iterator for a contained values.
Returns
an iterator over all values.
def elements : Iterator[(A, B)]
Creates a new iterator over all elements contained in this object.
Returns
the new iterator
override def toList : List[(A, B)]
Returns a list containing all of the elements in this iterable object.
Notes
Will not terminate for infinite-sized collections.
def update(key : A, value : B) : Unit
This method allows one to add a new mapping from key to value to the map. If the map already contains a mapping for key, it will be overridden by this function.
Parameters
key - The key to update
value - The new value
Overrides
Map.update
def -=(key : A) : Unit
Remove a key from this map, noop if key is not present.
Parameters
key - the key to be removed
Overrides
Map.-=
override def clear : Unit
Removes all mappings from the map. After this operation is completed, the map is empty.
Overrides
Map.clear
override def transform(f : (A, B) => B) : Unit
This function transforms all the values of mappings contained in this map with function f.
Parameters
f - The transformation to apply
Overrides
Map.transform
override def retain(p : (A, B) => Boolean) : Unit
This method retains only those mappings for which the predicate p returns true.
Parameters
p - The test predicate
Deprecated
cannot be type inferred because if retain in Iterable.
Overrides
Map.retain
override def toString : java.lang.String
Creates a string representation for this map.
Returns
a string showing all mappings
Scala Library