scala

trait SeqProxy

[source: scala/SeqProxy.scala]

trait SeqProxy[+A]
extends Seq[A] with IterableProxy[A]
This class implements a proxy for sequences. It forwards all calls to a different sequence object.
Author
Martin Odersky
Matthias Zenger
Version
2.0, 31/12/2006
Direct Known Subclasses:
PriorityQueueProxy, QueueProxy, StackProxy

Method Summary
override def apply (i : Int) : A
override def concat [B >: A](that : Iterable[B]) : Seq[B]
Appends two iterable objects.
override def contains (elem : Any) : Boolean
Tests if the given value elem is a member of this sequence.
override def copyToArray [B >: A](xs : Array[B], start : Int) : Unit
Fills the given array xs with the elements of this sequence starting at position start.
override def drop (n : Int) : Seq[A]
Returns this sequence without its n first elements If this sequence has less than n elements, the empty sequence is returned.
override def dropWhile (p : (A) => Boolean) : Seq[A]
Returns the longest suffix of this sequence whose first element does not satisfy the predicate p.
override def filter (p : (A) => Boolean) : Seq[A]
Returns all the elements of this sequence that satisfy the predicate p. The order of the elements is preserved.
override def flatMap [B](f : (A) => Iterable[B]) : Seq[B]
Applies the given function f to each element of this sequence, then concatenates the results.
override def isDefinedAt (x : Int) : Boolean
Is this partial function defined for the index x?
override def isEmpty : Boolean
Returns true if length == 0
override def lastIndexOf [B >: A](elem : B) : Int
Returns the index of the last occurence of the specified element in this sequence, or -1 if the sequence does not contain this element.
override def length : Int
Returns the length of the sequence.
override def map [B](f : (A) => B) : Seq[B]
Returns the sequence resulting from applying the given function f to each element of this sequence.
override def reverse : Seq[A]
A sequence consisting of all elements of this sequence in reverse order.
abstract def self : Seq[A]
override def slice (from : Int, len : Int) : Seq[A]
Returns a subsequence starting from index from consisting of len elements.
override def take (n : Int) : Seq[A]
Returns a sequence consisting only over the first n elements of this sequence, or else the whole sequence, if it has less than n elements.
override def takeWhile (p : (A) => Boolean) : Seq[A]
Returns the longest prefix of this sequence whose elements satisfy the predicate p.
override def toArray [B >: A] : Array[B]
Converts this sequence to a fresh Array with length elements.
Methods inherited from IterableProxy
elements, foreach, forall, exists, find, findIndexOf, indexOf, foldLeft, foldRight, /:, :\, reduceLeft, reduceRight, sameElements, copyToBuffer, toList, mkString, addString
Methods inherited from Proxy
hashCode, equals, toString
Methods inherited from Seq
size, ++, subseq
Methods inherited from Collection
stringPrefix
Methods inherited from Iterable
mkString, addString, projection, hasDefiniteSize
Methods inherited from PartialFunction
orElse, andThen
Methods inherited from Function1
compose
Methods inherited from AnyRef
getClass, clone, notify, notifyAll, wait, wait, wait, finalize, ==, !=, eq, ne, synchronized
Methods inherited from Any
==, !=, isInstanceOf, asInstanceOf
Method Details
abstract def self : Seq[A]
Overrides
IterableProxy.self

override def apply(i : Int) : A

override def length : Int
Returns the length of the sequence.
Returns
the sequence length.
Overrides
Seq.length

override def isEmpty : Boolean
Returns true if length == 0
Overrides
Seq.isEmpty

@deprecated

override def concat[B >: A](that : Iterable[B]) : Seq[B]
Appends two iterable objects.
Returns
the new iterable object
Deprecated
use ++ instead
Overrides
Seq.concat, IterableProxy.concat

override def isDefinedAt(x : Int) : Boolean
Is this partial function defined for the index x?
Parameters
x - ..
Returns
true, iff x is a legal sequence index.
Overrides
Seq.isDefinedAt

override def lastIndexOf[B >: A](elem : B) : Int
Returns the index of the last occurence of the specified element in this sequence, or -1 if the sequence does not contain this element.
Parameters
elem - element to search for.
Returns
the index in this sequence of the last occurence of the specified element, or -1 if the sequence does not contain this element.
Overrides
Seq.lastIndexOf

override def map[B](f : (A) => B) : Seq[B]
Returns the sequence resulting from applying the given function f to each element of this sequence.
Parameters
f - function to apply to each element.
Returns
f(a0), ..., f(an) if this sequence is a0, ..., an.
Overrides
Seq.map, IterableProxy.map

override def flatMap[B](f : (A) => Iterable[B]) : Seq[B]
Applies the given function f to each element of this sequence, then concatenates the results.
Parameters
f - the function to apply on each element.
Returns
f(a0) ::: ... ::: f(an) if this sequence is a0, ..., an.
Overrides
Seq.flatMap, IterableProxy.flatMap

override def filter(p : (A) => Boolean) : Seq[A]
Returns all the elements of this sequence that satisfy the predicate p. The order of the elements is preserved.
Parameters
p - the predicate used to filter the list.
Returns
the elements of this list satisfying p.
Overrides
Seq.filter, IterableProxy.filter

override def take(n : Int) : Seq[A]
Returns a sequence consisting only over the first n elements of this sequence, or else the whole sequence, if it has less than n elements.
Parameters
n - the number of elements to take
Returns
the new sequence
Overrides
Seq.take, IterableProxy.take

override def drop(n : Int) : Seq[A]
Returns this sequence without its n first elements If this sequence has less than n elements, the empty sequence is returned.
Parameters
n - the number of elements to drop
Returns
the new sequence
Overrides
Seq.drop, IterableProxy.drop

override def takeWhile(p : (A) => Boolean) : Seq[A]
Returns the longest prefix of this sequence whose elements satisfy the predicate p.
Parameters
p - the test predicate.
Returns
the longest prefix of this sequence whose elements satisfy the predicate p.
Overrides
Seq.takeWhile, IterableProxy.takeWhile

override def dropWhile(p : (A) => Boolean) : Seq[A]
Returns the longest suffix of this sequence whose first element does not satisfy the predicate p.
Parameters
p - the test predicate.
Returns
the longest suffix of the sequence whose first element does not satisfy the predicate p.
Overrides
Seq.dropWhile, IterableProxy.dropWhile

override def reverse : Seq[A]
A sequence consisting of all elements of this sequence in reverse order.
Overrides
Seq.reverse

override def contains(elem : Any) : Boolean
Tests if the given value elem is a member of this sequence.
Parameters
elem - element whose membership has to be tested.
Returns
true iff there is an element of this sequence which is equal (w.r.t. ==) to elem.
Overrides
Seq.contains

override def slice(from : Int, len : Int) : Seq[A]
Returns a subsequence starting from index from consisting of len elements.
Parameters
from - ..
len - ..
Returns
..
Overrides
Seq.slice

override def toArray[B >: A] : Array[B]
Converts this sequence to a fresh Array with length elements.
Overrides
Seq.toArray

override def copyToArray[B >: A](xs : Array[B], start : Int) : Unit
Fills the given array xs with the elements of this sequence starting at position start.
Notes
Will not terminate for infinite-sized collections.
Parameters
xs - the array to fill.
start - starting index.
Precondition
the array must be large enough to hold all elements.