Need a cq5 example - adobe

Question

I am new to Adobe cq5. Went through many online blogs and tutorials but could not get much. Can any one provide a Adobe cq5 application example with detailed explanation that can store and retrieve data in JCR.
Thanks in advance.

Answer 1

Here's a snippet for CQ 5.4 to get you started. It inserts a content page and text (as a parsys) at an arbitrary position in the content hierarchy. The position is supplied by a workflow payload, but you could write something that runs from the command line and use any valid CRX path instead. The advantage of making it a process step is that you get a session established for you, and the navigation to the insert point has been taken care of.
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.jcr.Node;
import javax.jcr.RepositoryException;
import org.apache.sling.jcr.resource.JcrResourceConstants;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Properties;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Service;
import org.osgi.framework.Constants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.day.cq.workflow.WorkflowException;
import com.day.cq.workflow.WorkflowSession;
import com.day.cq.workflow.exec.WorkItem;
import com.day.cq.workflow.exec.WorkflowData;
import com.day.cq.workflow.exec.WorkflowProcess;
import com.day.cq.workflow.metadata.MetaDataMap;
import com.day.cq.wcm.api.NameConstants;
#Component
#Service
#Properties({
#Property(name = Constants.SERVICE_DESCRIPTION,
value = "Makes a new tree of nodes, subordinate to the payload node, from the content of a file."),
#Property(name = Constants.SERVICE_VENDOR, value = "Acme Coders, LLC"),
#Property(name = "process.label", value = "Make new nodes from file")})
public class PageNodesFromFile implements WorkflowProcess {
private static final Logger log = LoggerFactory.getLogger(PageNodesFromFile.class);
private static final String TYPE_JCR_PATH = "JCR_PATH";
* * *
public void execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap args)
throws WorkflowException {
//get the payload
WorkflowData workflowData = workItem.getWorkflowData();
if (!workflowData.getPayloadType().equals(TYPE_JCR_PATH)) {
log.warn("unusable workflow payload type: " + workflowData.getPayloadType());
workflowSession.terminateWorkflow(workItem.getWorkflow());
return;
}
String payloadString = workflowData.getPayload().toString();
//the text to be inserted
String lipsum = "Lorem ipsum...";
//set up some node info
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("d-MMM-yyyy-HH-mm-ss");
String newRootNodeName = "demo-page-" + simpleDateFormat.format(new Date());
SimpleDateFormat simpleDateFormatSpaces = new SimpleDateFormat("d MMM yyyy HH:mm:ss");
String newRootNodeTitle = "Demo page: " + simpleDateFormatSpaces.format(new Date());
//insert the nodes
try {
Node parentNode = (Node) workflowSession.getSession().getItem(payloadString);
Node pageNode = parentNode.addNode(newRootNodeName);
pageNode.setPrimaryType(NameConstants.NT_PAGE); //cq:Page
Node contentNode = pageNode.addNode(Node.JCR_CONTENT); //jcr:content
contentNode.setPrimaryType("cq:PageContent"); //or use MigrationConstants.TYPE_CQ_PAGE_CONTENT
//from com.day.cq.compat.migration
contentNode.setProperty(javax.jcr.Property.JCR_TITLE, newRootNodeTitle); //jcr:title
contentNode.setProperty(NameConstants.PN_TEMPLATE,
"/apps/geometrixx/templates/contentpage"); //cq:template
contentNode.setProperty(JcrResourceConstants.SLING_RESOURCE_TYPE_PROPERTY,
"geometrixx/components/contentpage"); //sling:resourceType
Node parsysNode = contentNode.addNode("par");
parsysNode.setProperty(JcrResourceConstants.SLING_RESOURCE_TYPE_PROPERTY,
"foundation/components/parsys");
Node textNode = parsysNode.addNode("text");
textNode.setProperty(JcrResourceConstants.SLING_RESOURCE_TYPE_PROPERTY,
"foundation/components/text");
textNode.setProperty("text", lipsum);
textNode.setProperty("textIsRich", true);
workflowSession.getSession().save();
}
catch (RepositoryException e) {
log.error(e.toString(), e);
workflowSession.terminateWorkflow(workItem.getWorkflow());
return;
}
}
}
I have posted further details and discussion.
A few other points:
I incorporated a timestamp into the name and title of the content
page to be inserted. That way, you can run many code and test cycles
without cleaning up your repository, and you know which test was the
most recently run. Added bonus: no duplicate file names, no
ambiguity.
Adobe and Day have been inconsistent about providing constants for
property values, node types, and suchlike. I used the constants that
I could find, and used literal strings elsewhere.
I did not fill in properties like the last-modified date. In code for
production I would do so.
I found myself confused by Node.setPrimaryType() and
Node.getPrimaryNodeType(). The two methods are only rough
complements; the setter takes a string but the getter returns a
NodeType with various info inside it.
In my original version of this code, I read the text to be inserted from a file, rather than just using the static string "Lorem ipsum..."
Once you've worked through this example, you should be able to use the Abobe docs to write code that reads data back from the CRX.

Answer 2

If you want to learn how to write a CQ application that can store and query data from the CQ JRC, see this article:
http://scottsdigitalcommunity.blogspot.ca/2013/02/querying-adobe-experience-manager-data.html
This provides a step by step guide and walks you right through the entire processes - including building the OSGi bundle using Maven.
FRom the comments above - I see reference to BND file. You should stay away from CRXDE to create OSGi and use Maven.