uk.gov.gchq.gaffer.mapstore.impl.CountAllElementsDefaultViewHandler Maven / Gradle / Ivy

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/*
 * Copyright 2017-2020 Crown Copyright
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package uk.gov.gchq.gaffer.mapstore.impl;

import uk.gov.gchq.gaffer.data.element.Element;
import uk.gov.gchq.gaffer.mapstore.MapStore;
import uk.gov.gchq.gaffer.mapstore.operation.CountAllElementsDefaultView;
import uk.gov.gchq.gaffer.operation.OperationException;
import uk.gov.gchq.gaffer.store.Context;
import uk.gov.gchq.gaffer.store.Store;
import uk.gov.gchq.gaffer.store.StoreTrait;
import uk.gov.gchq.gaffer.store.operation.handler.OutputOperationHandler;
import uk.gov.gchq.gaffer.store.schema.Schema;
import uk.gov.gchq.gaffer.user.User;

import java.util.stream.Stream;

/**
 * An {@link uk.gov.gchq.gaffer.store.operation.handler.OperationHandler} for the
 * {@link CountAllElementsDefaultView} operation on the {@link MapStore}.
 */
public class CountAllElementsDefaultViewHandler implements OutputOperationHandler {
    @Override
    public Long doOperation(final CountAllElementsDefaultView operation, final Context context, final Store store)
            throws OperationException {
        return doOperation(context, (MapStore) store);
    }

    private Long doOperation(final Context context, final MapStore mapStore) {

        final User user = context.getUser();
        final Schema schema = mapStore.getSchema();
        final boolean supportsVisibility = mapStore.getTraits().contains(StoreTrait.VISIBILITY);

        Stream elementStream = Stream.concat(
                mapStore.getMapImpl().getAllAggElements(schema.getGroups()),
                mapStore.getMapImpl().getAllNonAggElements(schema.getGroups()));

        if (supportsVisibility) {
            elementStream = GetElementsUtil.applyVisibilityFilter(elementStream, schema, user);
        }

        return elementStream.count();
    }
}