AbstractDirectQuery.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2021 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.elephant.direct;
 
import java.io.IOException;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.json.Json;
import javax.json.JsonArrayBuilder;
import javax.json.JsonObjectBuilder;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.turro.action.Actions;
import org.turro.collections.KeyValueMap;
import org.turro.elephant.context.ElephantContext;
import org.turro.elephant.context.IConstructor;
 
public abstract class AbstractDirectQuery implements IDirectContent {
 
  public String createQueryURL(String values) {
    return ElephantContext.getRootWebPath() +
            DirectContents.DIRECT_CONTENT_PATH + getIdentifier() +
            "?" + Actions.createRightNowAction("ds=true;" + values) + "&q={query}";
  }
  
  /* IDirectContent */
 
  @Override
  public boolean itsMe(String id) {
    return getIdentifier().equals(id);
  }
 
  @Override
  public boolean myTurn(HttpServletRequest request) {
    return DirectContents.isYourTurn(request, getIdentifier());
  }
 
  @Override
  public void execute(ServletContext context, HttpServletRequest request, HttpServletResponse response) {
    execute(ElephantContext.getConstructor(request, response));
  }  
 
  public void execute(IConstructor constructor) {
    KeyValueMap map = Actions.isRightNowAction(constructor) ? 
            Actions.getRightNowAction(constructor) :
            Actions.getAction(constructor);
    if(map != null && "true".equals(map.get("ds"))) {
      if(map.containsKey("sroot") && map.containsKey("sitem")) {
        writeJsonResponse(constructor.getResponse(), 
                generateJson(map.get("sroot"), map.get("sitem"), doSearch(map, constructor.getParameter("q"))));
      } else {
        doSearch(map, constructor.getParameter("q"));
      }
    }
  }
  
  protected abstract String getIdentifier();
  protected abstract List doSearch(KeyValueMap map, String query);
  
  /* Utility methods */
  
  protected String generateJson(String rootElement, String itemElement, List results) {
    JsonObjectBuilder builder = Json.createObjectBuilder();
    JsonArrayBuilder array = Json.createArrayBuilder();
    results.forEach(i -> array.add(createJsonItem(itemElement, i)));
    builder.add(rootElement, array);
    return builder.build().toString();
  }
  
  protected JsonObjectBuilder createJsonItem(String itemElement, Object item) {
    if(item instanceof String) {
      return Json.createObjectBuilder().add(itemElement, (String) item);
    } else if(item instanceof Double) {
      return Json.createObjectBuilder().add(itemElement, (Double) item);
    } else if(item instanceof Integer) {
      return Json.createObjectBuilder().add(itemElement, (Integer) item);
    } else if(item instanceof Boolean) {
      return Json.createObjectBuilder().add(itemElement, (Boolean) item);
    } else {
      return Json.createObjectBuilder().add(itemElement, item.toString());
    }
  }
  
  protected void writeJsonResponse(HttpServletResponse response, String json) {
    try {
      response.setContentType("application/json");
      //response.setCharacterEncoding(ElephantContext.getEncoding());
      response.getWriter().write(json);
    } catch (IOException ex) {
      Logger.getLogger(AbstractDirectQuery.class.getName()).log(Level.SEVERE, null, ex);
    }
  }
  
}