OGNL Part 6: Selection

In the part 5 of this series, we’ve discussed the Projection concept. In this part, see the example for the selection which is very similar to concept of SQL selection.

package au.com.ojitha.ongl;

import java.util.List;

import ognl.Ognl;
import ognl.OgnlException;

public class ProjectingExmaple {

	/**
	 * @param args
	 * @throws OgnlException 
	 */
	public static void main(String[] args) throws OgnlException {

		List<Integer> classes =(List<Integer>)Ognl.getValue("array.{? #this > 2}", new MyRoot());
		for (Integer class1 : classes) {
			System.out.println(class1);
		}
		System.out.println("size of the output "+classes.size());
		

	}

}

class MyRoot {
	private int[] array = {1,2,3,4};

	public int[] getArray() {
		return array;
	}

	public void setArray(int[] array) {
		this.array = array;
		
	}
	
}

Here the output

3
4
size of the output 2

Reference

OGNL language guide for more information.