Application: gvSIG desktop

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

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.Codes;

import org.gvsig.expressionevaluator.Function;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

public class TryFunction extends AbstractFunction {

    public static final String NAME = "TRY";

    public TryFunction() {

        super(Function.GROUP_PROGRAMMING, 

                NAME, 

                Range.between(1,2),

                null,

                NAME+"( {{expression}}, onerror )",

                null,

                "Object",

                true

        );

    }

    @Override

    public boolean useArgumentsInsteadObjects() {

        return true;

    }

    @Override

    public boolean allowConstantFolding() {

        return false;

    }

    @Override

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

        throw new UnsupportedOperationException("Not supported yet."); 

    }

    @Override

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

        Object value = null;

        try {

            value = getObject(interpreter, args, 0);

        } catch(Exception ex) {

            if( args.size()>1 ) {

                value = getObject(interpreter, args, 1);

            }

        }

        return value;

    }

}