On Fri, Apr 15, 2011 at 12:19 AM, Meredith Gregory
<
lgreg.meredith@gmail.com> wrote:
> Dear BaseXers,
> So far, BaseX has been a lot of fun to work with! Thanks for all your
> efforts on this codebase.
> i've got a couple of questions, though.
>
> Whether i've got no documents in a freshly created BXCollection, or i've
> ensured that there is at least one document present, a call to listResources
> always throws an IndexOutOfBounds exception. Is that the intended behavior?
> The reason i'm using this API is that i need to be able to update a single
> document in a collection guaranteed to have exactly one document. So, i
> thought i would simply ask the BXCollection to list it's resources, grab the
> first one (since there should only be one) and then use the id from the list
> returned by that API in subsequent queries. Maybe that's not the preferred
> approach? Is there a better one?
>
> Any help would be greatly appreciated.
> Best wishes,
> --greg
> override def getCollection( createIfMissing : Boolean )(
> xmlCollStr : String
> ) : Option[Collection] = {
> try {
> // BUGBUG -- LGM the semantics of BXCollection a little
> // different than createIfMissing; and requires catching the
> // database not found exception
> Some( new BXCollection( xmlCollStr, true ) )
> }
> catch {
> case e : XMLDBException => {
> val bxColl = new BXCollection( xmlCollStr, false )
> val document =
> bxColl.createResource(
> null, XMLResource.RESOURCE_TYPE
> ).asInstanceOf[XMLResource]
> document.setContent( "<database></database>" )
> bxColl.storeResource( document )
> Some( bxColl )
> }
> case _ => None
> }
> }
> override def update( xmlCollStr : String )(
> cnxn : CnxnCtxtLabel[Namespace,Var,String]
> ) : Unit = {
> for( xmlColl <- getCollection( true )( xmlCollStr ) ) {
> val resourceList : Array[String] = xmlColl.listResources
> if ( resourceList.size == 0 ) {
> val document =
> xmlColl.createResource(
> null, XMLResource.RESOURCE_TYPE
> ).asInstanceOf[XMLResource]
> document.setContent( xmlIfier.asXML( cnxn ).toString )
> xmlColl.storeResource( document )
> }
> else {
> val cnxnElem = xmlIfier.asXML( cnxn )
> cnxnElem match {
> case cElem : Elem => {
> delete( xmlCollStr, resourceList( 0 ) )( cElem )
> insert( xmlCollStr, resourceList( 0 ) )( cElem )
> }
> case _ => {
> throw new Exception( "record is not an XML element" )
> }
> }
> }
> }
> }
> <tweet>storing to db : org.basex.api.xmldb.BXDatabase@77dc754 pair :
> record(contactMeUsing(email),
> {"com.biosimilarity.lift.model.store.MonadicTermTypes_-Ground":{"v":{"@class":"string","$":"for
> the win
>
Mikail.Mauz@gmail.com"},"_-outer":{"@class":"com.biosimilarity.lift.model.store.PersistedMonadicTS$TheMTT$"}}})
> in coll : Squibble</tweet>
> java.lang.IndexOutOfBoundsException
> at java.io.RandomAccessFile.readBytes(Native Method)
> at java.io.RandomAccessFile.read(RandomAccessFile.java:322)
> at java.io.RandomAccessFile.readFully(RandomAccessFile.java:381)
> at org.basex.io.DataAccess.cursor(DataAccess.java:225)
> at org.basex.io.DataAccess.readToken(DataAccess.java:147)
> at org.basex.data.DiskData.txt(DiskData.java:213)
> at org.basex.data.DiskData.text(DiskData.java:181)
> at org.basex.api.xmldb.BXCollection.listResources(BXCollection.java:128)
> at
> com.biosimilarity.lift.model.store.xml.BaseXCnxnStorage$$anonfun$update$1.apply(BaseXXMLPersist.scala:313)
> at
> com.biosimilarity.lift.model.store.xml.BaseXCnxnStorage$$anonfun$update$1.apply(BaseXXMLPersist.scala:312)
> at scala.Option.foreach(Option.scala:185)
> at
> com.biosimilarity.lift.model.store.xml.BaseXCnxnStorage$class.update(BaseXXMLPersist.scala:312)
> at
> com.biosimilarity.lift.model.store.PersistedTermStoreScope$PersistedMonadicGeneratorJunction.update(PersistedMonadicTermStore.scala:321)
> at
> com.biosimilarity.lift.model.store.PersistedTermStoreScope$PersistedMonadicGeneratorJunction$$anonfun$putInStore$3$$anonfun$apply$12$$anonfun$apply$13.apply(PersistedMonadicTermStore.scala:468)
> at
> com.biosimilarity.lift.model.store.PersistedTermStoreScope$PersistedMonadicGeneratorJunction$$anonfun$putInStore$3$$anonfun$apply$12$$anonfun$apply$13.apply(PersistedMonadicTermStore.scala:459)
> at scala.Option.foreach(Option.scala:185)
> at
> com.biosimilarity.lift.model.store.PersistedTermStoreScope$PersistedMonadicGeneratorJunction$$anonfun$putInStore$3$$anonfun$apply$12.apply(PersistedMonadicTermStore.scala:459)
> at
> com.biosimilarity.lift.model.store.PersistedTermStoreScope$PersistedMonadicGeneratorJunction$$anonfun$putInStore$3$$anonfun$apply$12.apply(PersistedMonadicTermStore.scala:458)
> at scala.Option.foreach(Option.scala:185)
> at
> com.biosimilarity.lift.model.store.PersistedTermStoreScope$PersistedMonadicGeneratorJunction$$anonfun$putInStore$3.apply(PersistedMonadicTermStore.scala:458)
> at
> com.biosimilarity.lift.model.store.PersistedTermStoreScope$PersistedMonadicGeneratorJunction$$anonfun$putInStore$3.apply(PersistedMonadicTermStore.scala:458)
> at scala.util.continuations.package$.run(package.scala:30)
> at scala.concurrent.cpsops$$anonfun$spawn$1.apply$mcV$sp(cpsops.scala:9)
> at
> scala.concurrent.FJTaskRunners$FJTaskRunner$$anon$1.compute(FJTaskRunners.scala:21)
> at jsr166y.forkjoin.RecursiveAction.exec(RecursiveAction.java:247)
> at jsr166y.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:286)
> --
> L.G. Meredith
> Managing Partner
> Biosimilarity LLC
> 7329 39th Ave SW
> Seattle, WA 98136
>
>
+1 206.650.3740
>
>
http://biosimilarity.blogspot.com
>