"

 COPYRIGHT (c) 1989 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

"{ Package: 'stx:libbasic' }"

SequenceableCollection subclass:#ArrayedCollection

	instanceVariableNames:''

	classVariableNames:''

	poolDictionaries:''

	category:'Collections-Abstract'

!

!ArrayedCollection class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1989 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

documentation

"

    ArrayedCollection is an abstract superclass for all collections where 

    the elements can be accessed via an integer index,

    AND the collection is a fixed size collection. 

    Those fixed size collections cannot easily grow, since they store the 

    elements directly within the object and a grow operation can only be done 

    by #becoming another object.

    (other collections keep a reference to the physical container, which

     can be easily replaced)

    [Warning:] 

        currently, ST/X supports growing fix-size collections

        (such as Arrays, ByteArrays and Strings). However, this

        is done in a very slow way (using #become).

        Become is a very slow operation in a direct-pointer smalltalk

        system.

                                                                                \

        Therefore, you SHOULD rewrite any application that does this,

        to make use of OrderedCollections or any other collection which

        can grow faster.

        To remind you of that, a warning message is sent to the

        standard error whenever such an operation is performed (see #grow).

                                                                                \

        Also note, that some other smalltalk systems do NOT allow

        fix size collection to change their size, and that future

        ST/X versions may be changed to trigger an error (instead of a

        warning) in those situations.

    [author:]

        Claus Gittinger

    [see also:]

        OrderedCollection Array

"

! !

!ArrayedCollection class methodsFor:'instance creation'!

newFrom:aCollection 

    "Return an instance of me containing the same elements as aCollection."

    |newArray idx sz|

    sz := aCollection size.

    newArray := self new:sz.

    aCollection isSequenceable ifTrue:[

        newArray replaceFrom:1 to:sz with:aCollection startingAt:1

    ] ifFalse:[

        idx := 1.

        aCollection do:[:element | 

            newArray at:idx put:element.

            idx := idx + 1.

        ].

    ].

    ^ newArray

    "

     Array newFrom: #[1 2 3]

     #[1 2 3] as: Array      

     #[1 2 3] as: ByteArray  

     #($c  $h  $r) as: String 

     #($c  $h  $r) as: Text

    "

!

with:element

    "return a new SequenceableCollection with one element:anObject"

    |newCollection|

    newCollection := self new:1.

    newCollection at:1 put:element.

    ^newCollection

    "

     OrderedCollection with:1

     SortedCollection with:99 

    "

!

with:first with:second

    "return a new SequenceableCollection with two elements"

    |newCollection|

    newCollection := self new:2.

    newCollection at:1 put:first; at:2 put:second.

    ^newCollection

    "

     OrderedCollection with:1 with:2

     SortedCollection with:99 with:3

     Array with:1 with:2

    "

    "Modified: 22.1.1997 / 19:35:43 / cg"

!

with:a1 with:a2 with:a3

    "return a new SequenceableCollection with three elements"

    |newCollection|

    newCollection := self new:3.

    newCollection at:1 put:a1; at:2 put:a2; at:3 put:a3.

    ^ newCollection

    "

     OrderedCollection with:1 with:2 with:3

     Array with:1 with:2 with:3

    "

    "Modified: 22.1.1997 / 19:35:47 / cg"

!

with:a1 with:a2 with:a3 with:a4

    "return a new SequenceableCollection with four elements"

    |newCollection|

    newCollection := self new:4.

    newCollection at:1 put:a1; at:2 put:a2; at:3 put:a3; at:4 put:a4.

    ^ newCollection

    "

     OrderedCollection with:1 with:2 with:3 with:4

     Array with:1 with:2 with:3 with:4

    "

    "Modified: 22.1.1997 / 19:35:52 / cg"

!

with:a1 with:a2 with:a3 with:a4 with:a5

    "return a new SequenceableCollection with five elements"

    |newCollection|

    newCollection := self new:5.

    newCollection at:1 put:a1; at:2 put:a2; at:3 put:a3; at:4 put:a4;

                  at:5 put:a5.

    ^ newCollection

    "

     OrderedCollection with:1 with:2 with:3 with:4 with:5

     Array with:1 with:2 with:3 with:4 with:5

    "

    "Modified: 22.1.1997 / 19:35:57 / cg"

!

with:a1 with:a2 with:a3 with:a4 with:a5 with:a6

    "return a new SequenceableCollection with six elements"

    |newCollection|

    newCollection := self new:6.

    newCollection at:1 put:a1; at:2 put:a2; at:3 put:a3; at:4 put:a4;

                  at:5 put:a5; at:6 put:a6.

    ^ newCollection

    "

     OrderedCollection with:1 with:2 with:3 with:4 with:5 with:6

     Array with:1 with:2 with:3 with:4 with:5 with:6

    "

    "Modified: 22.1.1997 / 19:36:03 / cg"

!

with:a1 with:a2 with:a3 with:a4 with:a5 with:a6 with:a7

    "return a new SequenceableCollection with seven elements"

    |newCollection|

    newCollection := self new:7.

    newCollection at:1 put:a1; at:2 put:a2; at:3 put:a3; at:4 put:a4;

                  at:5 put:a5; at:6 put:a6; at:7 put:a7.

    ^ newCollection

    "

     OrderedCollection with:1 with:2 with:3 with:4 with:5 with:6 with:7

     Array with:1 with:2 with:3 with:4 with:5 with:6 with:7

    "

    "Modified: 22.1.1997 / 19:36:20 / cg"

!

with:a1 with:a2 with:a3 with:a4 with:a5 with:a6 with:a7 with:a8

    "return a new SequenceableCollection with eight elements"

    |newCollection|

    newCollection := self new:8.

    newCollection at:1 put:a1; at:2 put:a2; at:3 put:a3; at:4 put:a4;

                  at:5 put:a5; at:6 put:a6; at:7 put:a7; at:8 put:a8.

    ^ newCollection

    "

     OrderedCollection with:1 with:2 with:3 with:4 with:5 with:6 with:7 with:8

     Array with:1 with:2 with:3 with:4 with:5 with:6 with:7 with:8

    "

    "Modified: 22.1.1997 / 19:35:21 / cg"

!

withAll:aCollection

    "return a new Collection with all elements taken from the argument,

     aCollection"

    |newCollection newSize

     index "{ Class: SmallInteger }" |

    newSize := aCollection size.

    newCollection := self new:newSize.

    aCollection isSequenceable ifTrue:[

	"/

	"/ aCollection has indexed elements

	"/ a block-replace may be faster

	"/

	newCollection replaceFrom:1 to:newSize with:aCollection startingAt:1

    ] ifFalse:[

	"/

	"/ must enumerate the elements individually

	"/

	index := 1.

	aCollection do:[:element |

	    newCollection at:index put:element.

	    index := index + 1

	]

    ].

    ^ newCollection

    "

     OrderedCollection withAll:#(1 2 3 4 5)

     SortedCollection withAll:#(99 17 53 1 101) 

    "

    "Modified: 13.4.1996 / 12:14:38 / cg"

!

withSize:size

    "return a new collection of size.

     For variable size collections, this is different from #new:,

     in that #new: creates an empty collection with preallocated size,

     while #withSize: creates a non empty one."

    ^ self new:size.

    "

     (OrderedCollection new:10)  

     (OrderedCollection withSize:10) 

     (Array new:10) 

     (Array withSize:10) 

    "

! !

!ArrayedCollection class methodsFor:'queries'!

growIsCheap

    "return true, if this collection can easily grow

     (i.e. without a need for become:).

     Since this is the superclass of all indexed fix-size collections,

     return false here."

    ^ false

!

isAbstract

    "Return if this class is an abstract class.

     True is returned for ArrayedCollection here; false for subclasses.

     Abstract subclasses must redefine again."

    ^ self == ArrayedCollection

! !

!ArrayedCollection methodsFor:'adding'!

addAll:aCollection

    "add all elements of the argument, aCollection to the receiver.

     Returns the argument, aCollection (sigh).

     Redefined here, to perform only a single slow grow operation"

    |mySize|

    mySize := self size.

    self grow:mySize + aCollection size.

    aCollection do:[:element |

        mySize := mySize + 1.

        self at:mySize put:element

    ].

    ^ aCollection

    "

        #(1 2 3 4) addAll:#(5 6 7 8); yourself

    "

! !

!ArrayedCollection methodsFor:'copying'!

copyEmptyAndGrow:size

    "return a new instance of the receivers species with size

     nilled elements and any named instance variables copied."

    "special case for Array, which has no named instance vars"

    |cls|

    (cls := self class) instSize == 0 ifTrue:[

	^ cls new:size

    ].

    ^ super copyEmptyAndGrow:size

! !

!ArrayedCollection methodsFor:'error handling'!

fixedSizeError

    "{ Pragma: +optSpace }"

    "report an error that size of the collection cannot be changed.

     This is not used right now (instead, a warning is sent to stderr

     in the #grow method); however, future versions of ST/X may no longer

     allow fixed size collection to grow.

     Read the documentation on why things are that way ..."

    ^ self error:'cannot change size'

    "Modified: 18.7.1996 / 21:39:09 / cg"

! !

!ArrayedCollection methodsFor:'printing & storing'!

storeOn:aStream

    "output a printed representation (which can be re-read with readFrom:)

     onto the argument aStream. Redefined to output index access."

    |index "{ Class: SmallInteger }"|

    thisContext isRecursive ifTrue:[

        Object recursiveStoreStringSignal raiseRequestWith:self.

        'ArrayedCollection [error]: storeOn: of self referencing collection.' errorPrintCR.

        aStream nextPutAll:'#recursive'.

        ^ self

    ].

    aStream nextPutAll:'(('; nextPutAll:self class name; nextPutAll:' new:'.

    self size printOn:aStream.

    aStream nextPutAll:')'.

    index := 1.

    self do:[:element |

        aStream nextPutAll:' at:'. index printOn:aStream. aStream nextPutAll:' put:('.

        element storeOn:aStream.

        aStream nextPutAll:');'.

        index := index + 1

    ].

    index > 1 ifTrue:[aStream nextPutAll:' yourself'].

    aStream nextPut:$)

    "

     (Array with:(1@2) with:(1->2)) storeString    

    "

    "Modified: 28.1.1997 / 00:39:59 / cg"

! !

!ArrayedCollection methodsFor:'queries'!

size

    "redefined to re-enable size->basicSize forwarding

     (it is caught in SequencableCollection)"

    ^ self basicSize

!

speciesForAdding

     "redefined here, since grow is not cheap.

      Used by functions which create a growing collection (see collect:with:, for example)"

    ^ OrderedCollection

! !

!ArrayedCollection methodsFor:'resizing'!

grow:newSize

    "grow the receiver i.e. cut off everything after newSize.

     Warning: this may be a slow operation due to the use of become 

     - you should write your collection classes to avoid the use of become. 

     You have been warned."

    |newArray oldSize|

    oldSize := self size.

    (newSize ~~ oldSize) ifTrue:[

        InfoPrinting ifTrue:[

            "/

            "/ output a warning - you should rewrite your application

            "/ to use some collection which implements grow: more efficient

            "/ (i.e. use OrderedCollection instead of Array ..)

            "/

            'ArrayedCollection [warning]: slow grow operation (' errorPrint.

            self class name infoPrint. ') ' errorPrintCR.

            Context showWhereWeCameFrom.

        ].

        newArray := self species new:newSize.

        newArray replaceFrom:1 to:(newSize min:oldSize) with:self.

        self become:newArray.

    ]

    "

     #(1 2 3 4 5 6) add:7

     #(1 2 3 4 5 6) remove:5 

     #(1 2 3 4 5 6) copy grow:3  

     #(1 2 3 4 5 6) copy grow:10  

     'hello world' copy grow:5   

     'hello' copy grow:20   

    "

    "Modified: 10.1.1997 / 15:14:43 / cg"

!

removeAll

    "{ Pragma: +optSpace }"

    "remove all elements from the receiver. Returns the receiver.

     For ArrayedCollections (which are actually fixed-size collections),

     this is a slow operation, since a #become: is required to update

     all owners. Better use a collection which is prepared for growing

     (i.e. an OrderedCollection).

     We output a warning message here, to remind you about that."

    'ArrayedCollection [info]: slow removeAll operation (' infoPrint.

    self class name infoPrint. ')' infoPrintCR.

    self become:(self copyEmpty)

    "

     #(1 2 3 4 5) copy removeAll    

     #(1 2 3 4 5) removeAll    

    "

    "Modified: 10.1.1997 / 15:14:55 / cg"

! !

!ArrayedCollection class methodsFor:'documentation'!

version

!

version_SVN

! !