Examples of org.apache.cayenne.query.Query

org.apache.cayenne.query.Query
Defines minimal API of a query descriptor that is executable via Cayenne.

            }


            // index queries
            Iterator queries = map.getQueries().iterator();
            while (queries.hasNext()) {
                Query query = (Query) queries.next();
                String name = query.getName();
                Object existingQuery = queryCache.put(name, query);


                if (existingQuery != null && query != existingQuery) {
                    throw new CayenneRuntimeException("More than one Query for name"
                            + name);

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    /**
     * Returns a named query or null if no query exists for a given name.
     */
    public synchronized Query lookupQuery(String name) {
        Query result = (Query) queryCache.get(name);


        if (result == null) {
            // reconstruct cache just in case some of the datamaps
            // have changed and now contain the required information
            constructCache();

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            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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    /**
     * Returns a named query or null if no query exists for a given name.
     */
    public synchronized Query lookupQuery(String name) {
        Query result = queryCache.get(name);


        if (result == null) {
            // reconstruct cache just in case some of the datamaps
            // have changed and now contain the required information
            constructCache();

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    public boolean isIteratedResult() {
        return callback.isIteratedResult();
    }


    Query queryForExecutedQuery(Query executedQuery) {
        Query q = null;


        if (queriesByExecutedQueries != null) {
            q = queriesByExecutedQueries.get(executedQuery);
        }

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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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        if (sort) {
            queries = Util.sortedIterator(queries, ProjectTraversal.queryComparator);
        }


        while (queries.hasNext()) {
            Query query = (Query) queries.next();
            ProjectPath queryPath = path.appendToPath(query);
            handler.projectNode(queryPath);
        }
    }

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                // cascade
                return !DONE;
            }


            // 3. refresh query - have to do it eagerly to refresh the objects involved
            Query cachedQuery = refreshQuery.getQuery();
            if (cachedQuery != null) {


                String cacheKey = cachedQuery
                        .getMetaData(context.getEntityResolver())
                        .getCacheKey();
                context.getQueryCache().remove(cacheKey);


                this.response = context.performGenericQuery(cachedQuery);

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     * @since 3.0
     */
    @Override
    protected void doAppendPart() throws IOException {


        Query q = queryAssembler.getQuery();


        // only select queries can have ordering...
        if (q == null || !(q instanceof SelectQuery)) {
            return;
        }

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        rootNode.traverse(this);
    }


    protected Expression extractQualifier() {
        Query q = queryAssembler.getQuery();


        Expression qualifier = ((QualifiedQuery) q).getQualifier();


        // append Entity qualifiers, taking inheritance into account
        ObjEntity entity = getObjEntity();

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