Examples with AggregationSelector org.locationtech.geowave.core.store.query.gwql.AggregationSelector used on opensource projects

Example 1 with AggregationSelector

use of org.locationtech.geowave.core.store.query.gwql.AggregationSelector in project geowave by locationtech.

the class SelectStatement method execute.

@Override
public ResultSet execute(final String... authorizations) {
    final String typeName = adapter.getTypeName();
    if (isAggregation()) {
        final AggregationQueryBuilder<PersistableList, List<Object>, T, ?> bldr = AggregationQueryBuilder.newBuilder();
        bldr.setAuthorizations(authorizations);
        if (filter != null) {
            bldr.filter(filter);
        }
        if (limit != null) {
            bldr.limit(limit);
        }
        final CompositeAggregation<T> composite = new CompositeAggregation<>();
        final List<String> columnNames = Lists.newArrayListWithCapacity(selectors.size());
        final List<Class<?>> columnTypes = Lists.newArrayListWithCapacity(selectors.size());
        for (final Selector selector : selectors) {
            final AggregationSelector aggregation = (AggregationSelector) selector;
            final AggregationFunction<?> function = GWQLExtensionRegistry.instance().getAggregationFunction(aggregation.functionName());
            if (function == null) {
                throw new RuntimeException("No aggregation function called '" + aggregation.functionName() + "' was found.");
            }
            composite.add(function.getAggregation(adapter, aggregation.functionArgs()));
            columnNames.add(selector.name());
            columnTypes.add(function.getReturnType());
        }
        bldr.aggregate(typeName, composite);
        return new SingletonResultSet(columnNames, columnTypes, dataStore.aggregate(bldr.build()));
    } else {
        final QueryBuilder<T, ?> bldr = QueryBuilder.newBuilder(adapter.getDataClass()).addTypeName(typeName);
        bldr.setAuthorizations(authorizations);
        if (filter != null) {
            bldr.filter(filter);
        }
        if ((selectors != null) && !selectors.isEmpty()) {
            final Set<String> usedAttributes = Sets.newHashSet();
            selectors.forEach(s -> usedAttributes.add(((ColumnSelector) s).columnName()));
            if (filter != null) {
                filter.addReferencedFields(usedAttributes);
            }
            for (final String attribute : usedAttributes) {
                if (adapter.getFieldDescriptor(attribute) == null) {
                    throw new RuntimeException("No column named " + attribute + " was found in " + typeName);
                }
            }
            bldr.subsetFields(typeName, usedAttributes.toArray(new String[usedAttributes.size()]));
        } else {
            selectors = Lists.transform(Arrays.asList(adapter.getFieldDescriptors()), f -> new ColumnSelector(f.fieldName()));
        }
        if (limit != null) {
            bldr.limit(limit);
        }
        return new AdapterEntryResultSet<>(selectors, adapter, dataStore.query(bldr.build()));
    }
}