Is it possible to search ArrayCollection by index?

Hi all,
As I know, we can loop and compare each item of ArrayCollection to get correct item we want. Obveriously, the performance will get bad and it's not a wise method to search. Can we create a index for the key field of each item? Or is there any other class providing such functionality?
Thanks,

When you say "an index" are you talking as a in a database table index? I.e. something that can quicken a search?
I am trying to understand your desire and I think what I am hearing is that you have an ArrayCollection contain a number of Objects. When you want to find a particular Object, you have found that one way to locate the desired instance is to walk through each element of the ArrayCollection and ask "does this element equal the key of the object I am looking for?". I think you are concerned by the amount of time that this may take.
Going back decades to my computing science knowledge, this would be an O(n) algorithm where n is the number of elements in the array.
Now, if there were an "index" (ala databases) on the data, then if this index were Sorted, you would be able to find your match in O(log n)
You may pay an O(n log n) cost to sort the index when the data structure is created but if you have a large number of searches then it may pay for itself.
I am not aware of any function that will support you on this out of the box (but that doesn't mean there isn't, only that I don't know about it.
I would also truthly ask yourself "is it worth the cost?". How many elements will you have in a typical array? How often do you anticipate locating an entry in that array?
Neil

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role that can be granted select, insert, update, and delete privileges on
data objects
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create table
create procedure
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null

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[16/Feb/2006:00:44:26 -0600] - WARNING<20805> - Backend Database - conn=4355 op=
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[16/Feb/2006:00:44:33 -0600] - WARNING<20805> - Backend Database - conn=4273 op=
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[16/Feb/2006:00:44:26 -0600] conn=4355 op=17 msgId=18 - RESULT err=0 tag=101 nen
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[16/Feb/2006:00:44:26 -0600] conn=4275 op=163 msgId=164 - SRCH base="o=mydomain.g
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[16/Feb/2006:00:44:26 -0600] conn=4275 op=163 msgId=164 - RESULT err=0 tag=101 n
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[16/Feb/2006:00:44:26 -0600] conn=4355 op=18 msgId=19 - SRCH base="o=mydomain.gob
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[16/Feb/2006:00:44:33 -0600] conn=4273 op=192 msgId=193 - RESULT err=0 tag=101 n
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[16/Feb/2006:00:44:33 -0600] conn=4273 op=193 msgId=194 - SRCH base="o=mydomain.g
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tingAddress mailDeliveryOption mail mailAlternateAddress mailEquivalentAddress v
acationStartDate vacationEndDate mailConversionTag mailMsgMaxBlocks mailHost mai
lQuota mailMsgQuota mailProgramDeliveryInfo mailDeliveryFileURL maildeliveryfile
mailAutoReplyMode mailAutoReplySubject mailAutoReplyText mailAutoReplyTextInter
nal mailAutoReplyTimeout mailSieveRuleSource mailForwardingAddress mailDeferProc
essing mgrpMsgRejectAction mgrprejecttext mgrpMsgRejectText mgrpBroadcasterPolic
y mgrpDisallowedBroadcaster mgrpAllowedBroadcaster mgrpDisallowedDomain mgrpAllo
wedDomain mgrpMsgMaxsize mgrpAuthPassword mgrpModerator mgrpDeliverTo memberURL
uniqueMember mgrpRFC822MailMember rfc822mailmember mgrpErrorsTo mgrpAddHeader mg
rpRemoveHeader mgrpMsgPrefixText mgrpMsgSuffixText mgmanMemberVisibility expanda
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lQuota mailMsgQuota mailProgramDeliveryInfo mailDeliveryFileURL maildeliveryfile
mailAutoReplyMode mailAutoReplySubject mailAutoReplyText mailAutoReplyTextInter
nal mailAutoReplyTimeout mailSieveRuleSource mailForwardingAddress mailDeferProc
essing mgrpMsgRejectAction mgrprejecttext mgrpMsgRejectText mgrpBroadcasterPolic
y mgrpDisallowedBroadcaster mgrpAllowedBroadcaster mgrpDisallowedDomain mgrpAllo
wedDomain mgrpMsgMaxsize mgrpAuthPassword mgrpModerator mgrpDeliverTo memberURL
uniqueMember mgrpRFC822MailMember rfc822mailmember mgrpErrorsTo mgrpAddHeader mg
rpRemoveHeader mgrpMsgPrefixText mgrpMsgSuffixText mgmanMemberVisibility expanda
ble"
[16/Feb/2006:00:44:56 -0600] conn=4273 op=193 msgId=194 - RESULT err=0 tag=101 n
entries=1 etime=23 notes=U
[16/Feb/2006:00:44:56 -0600] conn=4273 op=194 msgId=195 - SRCH base="dc=ims-ms-d
aemon,o=internet" scope=0 filter="(|(objectClass=inetDomain)(objectClass=inetdom
ainalias))" attrs=ALL
[16/Feb/2006:00:44:56 -0600] conn=4273 op=194 msgId=195 - RESULT err=32 tag=101
nentries=0 etime=0
[16/Feb/2006:00:45:06 -0600] conn=4275 op=164 msgId=165 - RESULT err=0 tag=101 nentries=1 etime=17 notes=U

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[09/Dec/2005:09:02:05 -0600] - WARNING<20805> - Backend Database - conn=34870992 op=1 msgId=2 - search is not indexed
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Holger

Is it possible to search the client for a file in WebDynpro?

Hi,
I need to check inside a WebDynpro application wether a
file exists on a client or not, befor showing or listing it.
I have a UNC-Name for the location (e.g.
servername\dirname\filename.extension).
Another task would be to browse this directory for all other existing files and dirs and list them.
Is this at all possible with WebDynpro?
Or would this only be possible by using the filesystem of
the applicationserver (e.g. mount the dir on the filesys)?
Is it possible to launch a client-located script (like VB-Script or such) in WebDynpro?
(e.g. to search the dir, create a text-file and read this text-file).
Or are these concepts totally against the security-policies
of web-based applications?
Thanks in advance.
Alf

Hi Alfred,
generally web applications run in a sandbox on the client.
That means that they have no access to the file system.
To get access you need to install a certificate on the client:
You create a key with the Java-Tool "Keytool" and sign the application (or the applet) with the Java-Tool "Jarsigner".
That generates a *.cert file wich you now have to export from the parent system and import onto the client (with Keytool).
You will find many detilled instructions for this procedure in the internet.
Unfortunately I don`t know how it works with Web Dynpro.
Karsten

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