Application: gvSIG desktop

package org.gvsig.expressionevaluator.impl.function.operator;

import java.util.Objects;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import org.gvsig.expressionevaluator.Function;

import org.gvsig.expressionevaluator.Interpreter;

public class RegExpOperator extends AbstractBinaryOperator {

    public RegExpOperator() {

        super(Function.GROUP_BOOLEAN, "~");      

    }

    @Override

    public boolean allowConstantFolding() {

        return true;

    }

    @Override

    public Object call(Interpreter interpreter, Object op1, Object op2) { 

        String re = Objects.toString(op2, "");

        Pattern exp = (Pattern) interpreter.getCache().get(this.getClass(), re);

        if( exp == null ) {

            exp = Pattern.compile(re);

            interpreter.getCache().put(this.getClass(), re, exp);

        } 

        Matcher m = exp.matcher(Objects.toString(op1,""));

        if( m == null ) {

            return false;

        }

        return m.matches();

    }

}