/*
* #%L
* adaptTo()
* %%
* Copyright (C) 2014 adaptTo() Conference
* %%
* 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.
* #L%
*/
package org.adaptto.rookie.demo.components;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.servlet.ServletException;
import org.apache.commons.lang.ArrayUtils;
import org.apache.felix.scr.annotations.sling.SlingServlet;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.resource.ModifiableValueMap;
import org.apache.sling.api.resource.PersistenceException;
import org.apache.sling.api.resource.ValueMap;
import org.apache.sling.api.servlets.SlingAllMethodsServlet;
/**
* Like update action using Sling CRUD API to write to repository.
*/
@SlingServlet(resourceTypes="/apps/rookiedemo/components/talk", selectors="likeme", methods="POST")
public class LikeMe extends SlingAllMethodsServlet {
private static final long serialVersionUID = -827047552677135151L;
@Override
protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {
updateLikeCounter(request);
// return to main view
response.sendRedirect(request.getResource().getPath() + ".html");
}
private void updateLikeCounter(SlingHttpServletRequest request) throws PersistenceException {
ValueMap props = request.getResource().getValueMap();
// check if a user with this ip address has already liked this
String ipAddress = request.getRemoteAddr();
String[] likedAddresses = props.get("likedAddresses", new String[0]);
if (ArrayUtils.contains(likedAddresses, ipAddress)) {
return;
}
// increment like counter and store ip address
ValueMap writeProps = request.getResource().adaptTo(ModifiableValueMap.class);
writeProps.put("likes", writeProps.get("likes", 0L) + 1);
List<String> updatedLikedAddresses = new ArrayList<>(Arrays.asList(likedAddresses));
updatedLikedAddresses.add(ipAddress);
writeProps.put("likedAddresses", updatedLikedAddresses.toArray());
// save to repository
request.getResourceResolver().commit();
}
}