001/*
002 * (C) Copyright 2016 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Guillaume Renard <[email protected]>
018 */
019
020package org.nuxeo.ecm.restapi.server.jaxrs.enrichers;
021
022import static org.nuxeo.ecm.core.io.registry.reflect.Instantiations.SINGLETON;
023import static org.nuxeo.ecm.core.io.registry.reflect.Priorities.REFERENCE;
024
025import java.io.IOException;
026
027import org.nuxeo.ecm.collections.api.CollectionManager;
028import org.nuxeo.ecm.core.api.DocumentModel;
029import org.nuxeo.ecm.core.io.marshallers.json.enrichers.AbstractJsonEnricher;
030import org.nuxeo.ecm.core.io.registry.context.RenderingContext.SessionWrapper;
031import org.nuxeo.ecm.core.io.registry.reflect.Setup;
032import org.nuxeo.ecm.core.query.sql.NXQL;
033import org.nuxeo.runtime.api.Framework;
034
035import com.fasterxml.jackson.core.JsonGenerator;
036
037/**
038 * Enricher that tells whether a "Folderish" or a "Collection" has children or members.
039 * 
040 * @since 10.3
041 */
042@Setup(mode = SINGLETON, priority = REFERENCE)
043public class HasContentJsonEnricher extends AbstractJsonEnricher<DocumentModel> {
044
045    public static final String NAME = "hasContent";
046
047    public static final String FETCH_CHILD_QUERY = "SELECT * FROM Document WHERE ecm:mixinType != 'HiddenInNavigation' AND ecm:isTrashed = 0 AND ecm:parentId = %s";
048
049    public static final String FETCH_MEMBERS_QUERY = "SELECT * FROM Document WHERE ecm:mixinType != 'HiddenInNavigation' AND ecm:isTrashed = 0 AND collectionMember:collectionIds/* = %s";
050
051    public HasContentJsonEnricher() {
052        super(NAME);
053    }
054
055    @Override
056    public void write(JsonGenerator jg, DocumentModel document) throws IOException {
057        if (document.isFolder()) {
058            jg.writeBooleanField(NAME, hasContent(document, FETCH_CHILD_QUERY));
059        } else if (Framework.getService(CollectionManager.class).isCollection(document)) {
060            jg.writeBooleanField(NAME, hasContent(document, FETCH_MEMBERS_QUERY));
061        } else {
062            jg.writeBooleanField(NAME, false);
063        }
064    }
065
066    protected boolean hasContent(DocumentModel document, String query) throws IOException {
067        try (SessionWrapper wrapper = ctx.getSession(document)) {
068            // Limit result set to 1 as we just want to know if there's at least one child
069            return wrapper.getSession()
070                          .queryProjection(String.format(query, NXQL.escapeString(document.getId())), 1, 0)
071                          .size() > 0;
072        }
073    }
074
075}