Application: gvSIG desktop

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

import java.lang.reflect.Field;

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.Function;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

public class GetattrFunction extends AbstractFunction {

    public GetattrFunction() {

        super(Function.GROUP_OTHER, "getattr", Range.is(2));

    }

    @Override

    public Object call(Interpreter interpreter, Object[] args) throws Exception {

        Object obj = getObject(args, 0);

        String attrname = getStr(args,1);

        if( attrname == null ) {

            throw new NullPointerException("A attribute name was expected and a null was received");

        }

        if( obj==null ) {

            throw new NullPointerException("An object pointer was expected to access attribute "+attrname+" and a null was received");

        }

        Class<?> theClass = obj.getClass();

        Field field = theClass.getField(attrname);

        Object value = field.get(obj);

        return value;

    }

}