org.obiba.opal.web.magma.ParticipantsResource.java Source code

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Here is the source code for org.obiba.opal.web.magma.ParticipantsResource.java

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/*******************************************************************************
 * Copyright 2008(c) The OBiBa Consortium. All rights reserved.
 *
 * This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package org.obiba.opal.web.magma;

import java.util.Set;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.core.Response;

import org.obiba.magma.Datasource;
import org.obiba.magma.MagmaEngine;
import org.obiba.magma.ValueTable;
import org.obiba.magma.VariableEntity;
import org.obiba.opal.web.ws.security.NoAuthorization;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;

import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;

@Component
@Transactional
@Path("/participants")
public class ParticipantsResource {

    private static final String PARTICIPANT_ENTITY_TYPE = "Participant";

    @GET
    @Path("/count")
    @NoAuthorization
    public Response getParticipantCount() {
        Set<Datasource> datasources = MagmaEngine.get().getDatasources();
        ImmutableSet.Builder<VariableEntity> participants = ImmutableSet.builder();
        for (Datasource ds : datasources) {
            for (ValueTable table : Iterables.filter(ds.getValueTables(),
                    ParticipantEntityTypePredicate.INSTANCE)) {
                participants.addAll(table.getVariableEntities());
            }
        }
        return Response.ok(String.valueOf(participants.build().size())).build();
    }

    /**
     * Predicate that returns true when the entity type of a ValueTable is Participant.
     */
    private static final class ParticipantEntityTypePredicate implements Predicate<ValueTable> {

        private static final ParticipantEntityTypePredicate INSTANCE = new ParticipantEntityTypePredicate();

        @Override
        public boolean apply(ValueTable input) {
            return input.isForEntityType(PARTICIPANT_ENTITY_TYPE);
        }

    }
}