SlingResourceFilterDemoServlet.java

import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.servlets.HttpConstants;
import org.apache.sling.api.servlets.SlingSafeMethodsServlet;
import org.apache.sling.resource.filter.ResourceFilterStream;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.propertytypes.ServiceDescription;


import javax.servlet.Servlet;
import javax.servlet.ServletException;
import java.io.IOException;


@Component(service = Servlet.class, 
property = { "sling.servlet.methods=" + HttpConstants.METHOD_GET,
		     "sling.servlet.paths=" + "/bin/resourcefilterdemo" })
@ServiceDescription("SlingResourceFilterDemoServlet")
public class SlingResourceFilterDemoServlet extends SlingSafeMethodsServlet {

	private static final long serialVersionUID = 1L;

	private String type = "weretail/components/structure/page";

	@Override
	protected void doGet(final SlingHttpServletRequest req, final SlingHttpServletResponse resp)
			throws ServletException, IOException {

		Resource resource = req.getResourceResolver().getResource("/content/we-retail/us");
		
		resp.getWriter().println("===========getChildResources===========\n");
		getChildResourcesThroughTraversal(resource, resp);
		resp.getWriter().println("==========================================\n\n\n");
		resp.getWriter().println("===========getChildResourcesFilter===========\n");
		getChildResourcesThroughResourceFilter(resource, resp);
		resp.getWriter().println("==========================================\n\n\n");
		resp.getWriter().println("===========getChildResourcesThroughResourceFilterAnd===========\n");		
		getChildResourcesThroughResourceFilterAnd(resource, resp);

		resp.getWriter().println("==========================================\n\n\n");

	}

	private void getChildResourcesThroughTraversal(final Resource resource, final SlingHttpServletResponse resp) throws IOException {

		for (Resource child : resource.getChildren()) {
			if ("cq:Page".equals(child.getValueMap().get("jcr:primaryType", ""))) {
				Resource content = child.getChild("jcr:content");
				if (content != null && type.equals(content.getValueMap().get("sling:resourceType", ""))) {

					resp.getWriter().println("Path: " + child.getPath());

					getChildResourcesThroughTraversal(child, resp);

				}

			}
		}

	}

	private void getChildResourcesThroughResourceFilter(final Resource resource, final SlingHttpServletResponse resp)
			throws IOException {

		ResourceFilterStream resourceStream = resource.adaptTo(ResourceFilterStream.class);
		resourceStream.setBranchSelector("[jcr:primaryType] == 'cq:Page'")
				.setChildSelector("[jcr:content/sling:resourceType] == $type").addParam("type", type).stream()
				.forEach(r -> {

					try {
						resp.getWriter().println("Path: " + r.getPath());
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				});
	
	}
	
	private void getChildResourcesThroughResourceFilterAnd(final Resource resource, final SlingHttpServletResponse resp)
			throws IOException {

		ResourceFilterStream resourceStream = resource.adaptTo(ResourceFilterStream.class);
		resourceStream.setBranchSelector("[jcr:primaryType] == 'cq:Page'")
				.setChildSelector("[jcr:content/sling:resourceType] == $type and [jcr:content/test] like 'test'").addParam("type", type).stream()
				.forEach(r -> {
					try {
						resp.getWriter().println("Path: " + r.getPath());
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				});
	
	}


}