org.daxplore.presenter.server.storage.StorageTools.java Source code

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Here is the source code for org.daxplore.presenter.server.storage.StorageTools.java

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/**
 *  This file is part of Daxplore Presenter.
 *
 *  Daxplore Presenter is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 2.1 of the License, or
 *  (at your option) any later version.
 *
 *  Daxplore Presenter is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Daxplore Presenter.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.daxplore.presenter.server.storage;

import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Map;

import javax.jdo.PersistenceManager;

import org.daxplore.presenter.server.throwable.BadRequestException;
import org.json.simple.JSONArray;
import org.json.simple.parser.ContainerFactory;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class StorageTools {
    /**
     * Get some questions from the questions metadata file.
     * 
     * <p>This is useful when answering an embed request, as the embed mode only
     * uses two of the defined questions: one for the question and one for
     * the perspective.</p>
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static String getQuestionDefinitions(PersistenceManager pm, String prefix, List<String> questionIDs,
            Locale locale) throws BadRequestException {
        try {
            JSONArray definitions = new JSONArray();
            ContainerFactory containerFactory = new ContainerFactory() {
                @Override
                public Map createObjectContainer() {
                    return new LinkedHashMap();
                }

                @Override
                public List creatArrayContainer() {
                    return new LinkedList();
                }
            };

            Reader reader = new StringReader(TextFileStore.getFile(pm, prefix, "meta/questions", locale, ".json"));

            JSONParser parser = new JSONParser();
            List<Map> questionList = (List<Map>) parser.parse(reader, containerFactory);

            for (Map map : questionList) {
                Object o = map.get("column");
                String column = (String) o;
                if (questionIDs.contains(column)) {
                    definitions.add(map);
                }
            }

            return definitions.toJSONString();
        } catch (IOException | ParseException e) {
            throw new BadRequestException("Failed to read question definitions", e);
        }
    }
}