Examples of org.apache.cayenne.query.ObjectIdQuery

org.apache.cayenne.query.ObjectIdQuery
A query that matches zero or one object or data row corresponding to the ObjectId. Used internally by Cayenne to lookup objects by id. Notice that cache policies of ObjectIdQuery are different from generic {@link QueryMetadata} cache policies.ObjectIdQuery is special - it is the only query that can be done against Cayenne main cache, thus cache handling is significantly different from all other of the queries. @since 1.2 @author Andrus Adamchik

     * @since 1.1
     */
    public DataRow getCachedSnapshot(ObjectId oid) {


        if (context != null && context.getChannel() != null) {
            ObjectIdQuery query = new CachedSnapshotQuery(oid);
            List<?> results = context.getChannel().onQuery(context, query).firstList();
            return results.isEmpty() ? null : (DataRow) results.get(0);
        }
        else {
            return null;

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     * @since 1.2
     */
    public synchronized DataRow getSnapshot(ObjectId oid) {


        if (context != null && context.getChannel() != null) {
            ObjectIdQuery query = new ObjectIdQuery(oid, true, ObjectIdQuery.CACHE);
            List<?> results = context.getChannel().onQuery(context, query).firstList();
            return results.isEmpty() ? null : (DataRow) results.get(0);
        }
        else {
            return null;

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     * Overrides super implementation to property handle data row fetches.
     */
    @Override
    protected boolean interceptOIDQuery() {
        if (query instanceof ObjectIdQuery) {
            ObjectIdQuery oidQuery = (ObjectIdQuery) query;


            if (!oidQuery.isFetchMandatory()) {
                Object object = actingContext.getGraphManager().getNode(
                        oidQuery.getObjectId());
                if (object != null) {


                    // TODO: andrus, 10/14/2006 - obtaining a row from an object is the
                    // only piece that makes this method different from the super
                    // implementation. This is used in NEW objects sorting on insert. It
                    // would be nice to implement an alternative algorithm that wouldn't
                    // require this hack.
                    if (oidQuery.isFetchingDataRows()) {
                        object = ((DataContext) actingContext)
                                .currentSnapshot((Persistent) object);
                    }
                    // do not return hollow objects
                    else if (((Persistent) object).getPersistenceState() == PersistenceState.HOLLOW) {

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    }


    protected boolean interceptOIDQuery() {
        if (query instanceof ObjectIdQuery) {
            ObjectIdQuery oidQuery = (ObjectIdQuery) query;


            if (!oidQuery.isFetchMandatory() && !oidQuery.isFetchingDataRows()) {
                Object object = actingContext.getGraphManager().getNode(
                        oidQuery.getObjectId());
                if (object != null) {


                    // do not return hollow objects
                    if (((Persistent) object).getPersistenceState() == PersistenceState.HOLLOW) {
                        return !DONE;

View Full Code Here

    }


    private boolean interceptOIDQuery() {
        if (query instanceof ObjectIdQuery) {


            ObjectIdQuery oidQuery = (ObjectIdQuery) query;
            DataRow row = null;


            if (cache != null && !oidQuery.isFetchMandatory()) {
                row = cache.getCachedSnapshot(oidQuery.getObjectId());
            }


            // refresh is forced or not found in cache
            if (row == null) {


                if (oidQuery.isFetchAllowed()) {


                    runQueryInTransaction();
                }
                else {
                    response = new ListResponse();

View Full Code Here

            }
        }


        DataObject object = (DataObject) DataObjectUtils.objectForQuery(
                this,
                new ObjectIdQuery(oid));


        if (object == null) {
            throw new CayenneRuntimeException(
                    "Refetch failure: no matching objects found for ObjectId " + oid);
        }

View Full Code Here

        // how do we handle this for NEW objects correctly? For now bail from the method
        if (object.getObjectId().isTemporary()) {
            return null;
        }


        ObjectIdQuery query = new ObjectIdQuery(
                object.getObjectId(),
                true,
                ObjectIdQuery.CACHE);
        QueryResponse response = context.getChannel().onQuery(null, query);
        List<?> result = response.firstList();

View Full Code Here


    public void prepareForAccess(Persistent object, String property, boolean lazyFaulting) {
        if (object.getPersistenceState() == PersistenceState.HOLLOW) {


            ObjectId oid = object.getObjectId();
            List<?> objects = performQuery(new ObjectIdQuery(
                    oid,
                    false,
                    ObjectIdQuery.CACHE));


            if (objects.size() == 0) {

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     * @return A persistent object that matched the id, null if no matching objects were
     *         found
     * @throws CayenneRuntimeException if more than one object matched ObjectId.
     */
    public static Object objectForPK(ObjectContext context, ObjectId id) {
        return DataObjectUtils.objectForQuery(context, new ObjectIdQuery(
                id,
                false,
                ObjectIdQuery.CACHE));
    }

View Full Code Here


    public void prepareForAccess(Persistent object, String property, boolean lazyFaulting) {
        if (object.getPersistenceState() == PersistenceState.HOLLOW) {


            ObjectId oid = object.getObjectId();
            List<?> objects = performQuery(new ObjectIdQuery(
                    oid,
                    false,
                    ObjectIdQuery.CACHE));


            if (objects.size() == 0) {

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