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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2011, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.collection
import generic._
import mutable.{ Builder, ListBuffer }
import annotation.{tailrec, migration, bridge}
import annotation.unchecked.{ uncheckedVariance => uV }
import parallel.ParIterable
/** A template trait for traversable collections of type `Traversable[A]`.
*
* $traversableInfo
* @define mutability
* @define traversableInfo
* This is a base trait of all kinds of $mutability Scala collections. It
* implements the behavior common to all collections, in terms of a method
* `foreach` with signature:
* {{{
* def foreach[U](f: Elem => U): Unit
* }}}
* Collection classes mixing in this trait provide a concrete
* `foreach` method which traverses all the
* elements contained in the collection, applying a given function to each.
* They also need to provide a method `newBuilder`
* which creates a builder for collections of the same kind.
*
* A traversable class might or might not have two properties: strictness
* and orderedness. Neither is represented as a type.
*
* The instances of a strict collection class have all their elements
* computed before they can be used as values. By contrast, instances of
* a non-strict collection class may defer computation of some of their
* elements until after the instance is available as a value.
* A typical example of a non-strict collection class is a
* <a href="../immutable/Stream.html" target="ContentFrame">
* `scala.collection.immutable.Stream`</a>.
* A more general class of examples are `TraversableViews`.
*
* If a collection is an instance of an ordered collection class, traversing
* its elements with `foreach` will always visit elements in the
* same order, even for different runs of the program. If the class is not
* ordered, `foreach` can visit elements in different orders for
* different runs (but it will keep the same order in the same run).'
*
* A typical example of a collection class which is not ordered is a
* `HashMap` of objects. The traversal order for hash maps will
* depend on the hash codes of its elements, and these hash codes might
* differ from one run to the next. By contrast, a `LinkedHashMap`
* is ordered because it's `foreach` method visits elements in the
* order they were inserted into the `HashMap`.
*
* @author Martin Odersky
* @version 2.8
* @since 2.8
* @tparam A the element type of the collection
* @tparam Repr the type of the actual collection containing the elements.
*
* @define Coll Traversable
* @define coll traversable collection
*/
trait TraversableLike[+A, +Repr] extends HasNewBuilder[A, Repr]
with FilterMonadic[A, Repr]
with TraversableOnce[A]
with GenTraversableLike[A, Repr]
with Parallelizable[A, ParIterable[A]]
{
self =>
import Traversable.breaks._
/** The type implementing this traversable */
protected type Self = Repr
/** The collection of type $coll underlying this `TraversableLike` object.
* By default this is implemented as the `TraversableLike` object itself,
* but this can be overridden.
*/
def repr: Repr = this.asInstanceOf[Repr]
/** The underlying collection seen as an instance of `$Coll`.
* By default this is implemented as the current collection object itself,
* but this can be overridden.
*/
protected[this] def thisCollection: Traversable[A] = this.asInstanceOf[Traversable[A]]
/** A conversion from collections of type `Repr` to `$Coll` objects.
* By default this is implemented as just a cast, but this can be overridden.
*/
protected[this] def toCollection(repr: Repr): Traversable[A] = repr.asInstanceOf[Traversable[A]]
/** Creates a new builder for this collection type.
*/
protected[this] def newBuilder: Builder[A, Repr]
protected[this] def parCombiner = ParIterable.newCombiner[A]
/** Applies a function `f` to all elements of this $coll.
*
* Note: this method underlies the implementation of most other bulk operations.
* It's important to implement this method in an efficient way.
*
*
* @param f the function that is applied for its side-effect to every element.
* The result of function `f` is discarded.
*
* @tparam U the type parameter describing the result of function `f`.
* This result will always be ignored. Typically `U` is `Unit`,
* but this is not necessary.
*
* @usecase def foreach(f: A => Unit): Unit
*/
def foreach[U](f: A => U): Unit
/** Tests whether this $coll is empty.
*
* @return `true` if the $coll contain no elements, `false` otherwise.
*/
def isEmpty: Boolean = {
var result = true
breakable {
for (x <- this) {
result = false
break
}
}
result
}
/** Tests whether this $coll is known to have a finite size.
* All strict collections are known to have finite size. For a non-strict collection
* such as `Stream`, the predicate returns `true` if all elements have been computed.
* It returns `false` if the stream is not yet evaluated to the end.
*
* Note: many collection methods will not work on collections of infinite sizes.
*
* @return `true` if this collection is known to have finite size, `false` otherwise.
*/
def hasDefiniteSize = true
def ++[B >: A, That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[Repr, B, That]): That = {
val b = bf(repr)
if (that.isInstanceOf[IndexedSeqLike[_, _]]) b.sizeHint(this, that.seq.size)
b ++= thisCollection
b ++= that.seq
b.result
}
@bridge
def ++[B >: A, That](that: TraversableOnce[B])(implicit bf: CanBuildFrom[Repr, B, That]): That =
++(that: GenTraversableOnce[B])(bf)
/** Concatenates this $coll with the elements of a traversable collection.
* It differs from ++ in that the right operand determines the type of the
* resulting collection rather than the left one.
*
* @param that the traversable to append.
* @tparam B the element type of the returned collection.
* @tparam That $thatinfo
* @param bf $bfinfo
* @return a new collection of type `That` which con
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all-wcprops 2KB all-wcprops 2KB all-wcprops 1KB DoctorController.class 4KB DoctorController.class 4KB UserController.class 4KB UserController.class 4KB RegisterController.class 3KB RegisterController.class 3KB DepartmentController.class 3KB DepartmentController.class 3KB Register.class 3KB Register.class 3KB User.class 2KB User.class 2KB DoctorServiceImpl.class 2KB DoctorServiceImpl.class 2KB Doctor.class 2KB Doctor.class 2KB DepartmentServiceImpl.class 2KB DepartmentServiceImpl.class 2KB RegisterServiceImpl.class 2KB RegisterServiceImpl.class 2KB LoginInterceptor.class 1KB LoginInterceptor.class 1KB Department.class 1KB Department.class 1KB UserServiceImpl.class 1KB UserServiceImpl.class 1KB DoctorService.class 656B DoctorService.class 656B DoctorDao.class 644B DoctorDao.class 644B RegisterService.class 557B RegisterService.class 557B RegisterDao.class 545B RegisterDao.class 545B DepartmentService.class 460B DepartmentService.class 460B DepartmentDao.class 448B DepartmentDao.class 448B UserDao.class 341B UserDao.class 341B UserService.class 271B UserService.class 271B .classpath 1KB org.eclipse.wst.common.component 643B org.eclipse.wst.jsdt.ui.superType.container 49B main.css 241KB main.css 241KB icon.css 229KB icon.css 229KB summernote-bs3.css 143KB summernote-bs3.css 143KB style.css 134KB style.css 134KB bootstrap.min.css 118KB bootstrap.min.css 118KB animate.css 64KB animate.css 64KB datepicker3.css 33KB datepicker3.css 33KB font-awesome.css 32KB font-awesome.css 32KB bootstrap-rtl.css 31KB bootstrap-rtl.css 31KB font-awesome.min.css 26KB font-awesome.min.css 26KB ambiance.css 25KB ambiance.css 25KB style.min.css 25KB style.min.css 25KB sweetalert.css 18KB sweetalert.css 18KB simditor.css 17KB simditor.css 17KB ui.jqgrid.css 16KB ui.jqgrid.css 16KB layer.css 14KB layer.css 14KB umeditor.min.css 14KB umeditor.min.css 14KB jasny-bootstrap.min.css 14KB jasny-bootstrap.min.css 14KB jquery-ui-1.10.4.custom.min.css 14KB jquery-ui-1.10.4.custom.min.css 14KB chosen.css 12KB chosen.css 12KB dropzone.css 11KB dropzone.css 11KB layer.css 11KB layer.css 11KB layim.css 11KB layim.css 11KB fullcalendar.css 11KB fullcalendar.css 11KB summernote.css 10KB summernote.css 10KB plyr.css 10KB plyr.css 10KB共 1287 条
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