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

            logObj.debug("no cached snapshot for ObjectId: " + oid);
        }


        // try getting it from database


        Query query = new ObjectIdQuery(oid, true, ObjectIdQuery.CACHE_REFRESH);
        List results = channel.onQuery(null, query).firstList();


        if (results.size() > 1) {
            throw new CayenneRuntimeException("More than 1 object found for ObjectId "
                    + oid

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    }


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


            ObjectIdQuery oidQuery = (ObjectIdQuery) query;


            DataRow row = null;


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


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


                if (oidQuery.isFetchAllowed()) {


                    runQueryInTransaction();


                    List result = response.firstList();
                    if (result != null && !result.isEmpty()) {


                        if (result.size() > 1) {
                            throw new CayenneRuntimeException(
                                    "More than 1 row found for ObjectId "
                                            + oidQuery.getObjectId()
                                            + ". Fetch matched "
                                            + result.size()
                                            + " rows.");
                        }


                        // cache for future use
                        cache.snapshots.put(oidQuery.getObjectId(), result.get(0));
                    }
                }
                else {
                    response = new ListResponse();
                }

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


            ObjectId gid = object.getObjectId();
            List objects = performQuery(new ObjectIdQuery(gid));


            if (objects.size() == 0) {
                throw new FaultFailureException(
                        "Error resolving fault, no matching row exists in the database for GlobalID: "
                                + gid);

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     * @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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    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));
    }

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        if (id.isTemporary()) {
            return null;
        }


        // skip context cache lookup, go directly to its channel
        Query query = new ObjectIdQuery((ObjectId) nodeId);
        QueryResponse response = context.getChannel().onQuery(context, query);
        List objects = response.firstList();


        if (objects.size() == 0) {
            throw new CayenneRuntimeException("No object for ID exists: " + nodeId);

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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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    }


    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();

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