Storing a string as an element of a multivalued property of a node in a Sling based application

By meamitava - JCRLead | Posted on 2009-09-04 04:18

Multivalued property is indeed a problematic issue to handle in case of a Java Content Repository node in a Sling based application. The problem multiplies when we try to carry out any form of tweaking on such a node. I had faced a situation, wherein it was required to store a string as an element of a multivalued property of a JCR node. The main problem was how to store a string as an element of a Value array. I resolved the problem by following the below steps:

• Pass the string to be stored and the node name as parameters to a Servlet
• From the servlet invoke a method to store the string with the following parameters -

             HttpServletRequest
             String
             Nodename

• Within the method obtain a jcrsession object
• Traverse down to the desired node using the jcrsession object

The following variables have been used in the below mentioned code snippet for storing the string:

• demonode – The node containing the multivalued property
• demomutivalue – The property object containing the elements of the multivalued property
• demostring – The string that needs to be stored

Here’s the sample code snippet :

Property demomultivalue = demonode.getProperty("multiprop");

//Creating a ValueFactory object
ValueFactory factory = jcrsession.getValueFactory();

//converting the string to a Value object
Value tempval = factory.createValue(abuseby);

//Checking that the value of the property is not null
   if(demomultivalue!=null){

 //Checking that the property is of type multivalue
	if(abuse.getDefinition().isMultiple()){
 			
    //Storing the elements of demomultivalue in a Value array
    Value val[] = demomultivalue.getValues();

   //Creating a temporary Value array having length one more that
   //of the original array
   Value temparr[] = new Value[val.length+1];

  //Using arraycopy() function to store the elements of original 
  //array into the temporary one
  System.arraycopy(val,0,temparr,0,val.length);

  //Appending the value corresponding to the string as the last 
  //element of the temporary array
  temparr[val.length]= tempval;

  //Setting the property object with the temporary array
  demomultivalue.setValue(temparr);

  //Saving the jcrsession
  jcrsession.save();
 }
}

Hopefully the blog will be helpful for anyone facing the same sort of problem.

-Amitava
 

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Previous comments on this post

By  tanmay - JCRDev | Posted on 2009-09-08 02:34

Good one