Application: gvSIG desktop

package org.gvsig.symbology.fmap.mapcontext.rendering.legend.styling;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import org.gvsig.tools.evaluator.EvaluatorWithDescriptions;

import org.gvsig.tools.evaluator.sqljep.SQLJEPEvaluator;

/**

 * 

 * Utility class to centralize the creation of an

 * @link {@link EvaluatorWithDescriptions}

 * 

 * TODO Perhaps create a manager in Tools to perform this operation

 * 

 * @author jldominguez

 *

 */

public class EvaluatorCreator {

	private static Map<String, EvaluatorWithDescriptions> evCache =

			new HashMap<String, EvaluatorWithDescriptions>();

    /**

     * Create an {@link EvaluatorWithDescriptions} that uses

     * the string expression provided

     * 

     * @param expr

     * @return

     */

    public static EvaluatorWithDescriptions getEvaluator(String expr) {

    	EvaluatorWithDescriptions resp = evCache.get(expr);

    	if (resp == null) {

    		resp = new SQLJEPEvaluator(expr);

    		if (evCache.size() > 100) {

    			removeOne(evCache);

    		}

    		evCache.put(expr, resp);

    	}

        return resp; 

    }

	private static void removeOne(

			Map<String, EvaluatorWithDescriptions> themap) {

		Iterator<String> iter = themap.keySet().iterator();

		int count = 50;

		String k = null;

		while (iter.hasNext() && count > 0) {

			k = iter.next();

			count--;

		}

		themap.remove(k);

	}

}

import org.gvsig.tools.evaluator.AndEvaluator;

		Evaluator eva = null;

			eva = new IntersectsEnvelopeEvaluator(

		if (lc.getSQLQuery() != null && lc.getSQLQuery().trim().length() > 0) {

		    Evaluator vp_eva = eva;

		    AndEvaluator and_eva = new AndEvaluator(vp_eva);

		    String sql_str = lc.getSQLQuery();

		    /*

		     * SQL filter was validated in the dialog

		     */

	        Evaluator sql_eval = EvaluatorCreator.getEvaluator(sql_str);

	        and_eva.addEvaluator(sql_eval);

	        eva = and_eva; 

		}

		featureQuery.setFilter(eva);