Examples of javax.jdo.Extent

javax.jdo.Extent
Instances of the Extent class represent the entire collection of instances in the data store of the candidate class possibly including its subclasses.
The Extent instance has two possible uses:
1. to iterate all instances of a particular class
2. to execute a Query in the data store over all instances of a particular class
@version 2.0

     * {@link javax.jdo.Query#setFilter(java.lang.String) etc.
     * @param pm the persistence manager
     * @return the JDO query instance
     */
    public Query getAPIQuery(PersistenceManager pm) {
        Extent extent = this.excludeSubClasses != null ? 
                pm.getExtent(this.candidateClass, 
                        !this.excludeSubClasses.booleanValue()) :
                pm.getExtent(this.candidateClass);
        Query query = pm.newQuery(extent);
        if (this.unique != null) {

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    public void testPositive() {
        PersistenceManager pm = getPM();
        Transaction tx = pm.currentTransaction();
        Class clazz = PCPoint.class;
        try {
            Extent extent = pm.getExtent(clazz, true);
            tx.begin();
            Query query = pm.newQuery();
            query.setClass(clazz);
            query.setCandidates(extent);
            query.setFilter("x == 2");

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    /** */
    protected Collection getAllObjects(PersistenceManager pm, Class pcClass) {
        Collection col = new Vector() ;
        Query query = pm.newQuery();
        query.setClass(pcClass);
        Extent candidates = null;
        try {
            candidates = pm.getExtent(pcClass, false);
        } catch (JDOException ex) {
            if (debug) logger.debug("Exception thrown for getExtent of class " +
                    pcClass.getName());

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    private boolean doPersistentInstancesExist()
    {
        boolean ret;
        Transaction t = pm.currentTransaction();
        t.begin();
        Extent e = pm.getExtent(StateTransitionObj.class, false);
        Iterator iter = e.iterator();
        ret = iter.hasNext();
        t.rollback();
        return ret;
    }

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            transaction.begin();
        if( !transaction.isActive() )
            if (debug)
                logger.debug("getHollowInstance: Transaction should be active, but it is not");
        
        Extent extent = pm.getExtent(StateTransitionObj.class, false);
        Iterator iter = extent.iterator();
        if( !iter.hasNext() ){
            if (debug)
                logger.debug("Extent for StateTransitionObj should not be empty");
            return null;
        }

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        }
    }


    private List<?> processUnconstrained( PersistenceManager pm, Class<?> clazz )
    {
        Extent extent = pm.getExtent( clazz, true );
        Query query = pm.newQuery( extent );
        return (List<?>) query.execute();
    }

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        return objects;
    }


    private List<?> processConstraint( PersistenceManager pm, Class<?> clazz, DeclarativeConstraint constraint )
    {
        Extent extent = pm.getExtent( clazz, true );
        Query query = pm.newQuery( extent );


        if ( constraint.getFilter() != null )
        {
            query.setFilter( constraint.getFilter() );

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        try
        {
            tx.begin();


            Extent extent = pm.getExtent( clazz, true );
            Query query = pm.newQuery( extent );


            if ( constraint.getFilter() != null )
            {
                query.setFilter( constraint.getFilter() );

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            {
                Class cls = clr.classForName(classNames[i]);
                AbstractClassMetaData cmd = mmgr.getMetaDataForClass(cls, clr);
                if (!cmd.isEmbeddedOnly())
                {
                    Extent ex = pm1.getExtent(cls);
                    Iterator iter = ex.iterator();
                    while (iter.hasNext())
                    {
                        objects.add(iter.next());
                    }
                }

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    qCompetition.closeAll();
    
    Iterator    itExtent  = null;
    Iterator itTp = null;
      
    Extent extent = pm.getExtent(Competition.class, false);
    itExtent = extent.iterator();
    while(itExtent.hasNext()) {
      comp =  (Competition)itExtent.next();
      logger.log(BasicLevel.DEBUG, "Competition: id=" + comp.getId() + ", tps=" + comp.getTrackpoints().toString());
      itTp = comp.getTrackpoints().iterator();
      while(itTp.hasNext()){
        Trackpoint tp = (Trackpoint) itTp.next();
        logger.log(BasicLevel.DEBUG, "Trackpoint: id_order=" + tp.getId_order() + ", id_competition=" + tp.getId_competition() );
      }
      
    }
    extent.closeAll();
    
    pm.close();
  }

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