Application: gvSIG desktop

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

import java.util.Objects;

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.impl.function.programming.BreakFunction.BreakException;

import org.gvsig.expressionevaluator.impl.function.programming.ReturnFunction.ReturnException;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

public class ForFunction extends AbstractFunction {

    public static final String NAME = "FOR";

    public ForFunction() {

        super(Function.GROUP_PROGRAMMING, 

                NAME, 

                Range.is(4),

                "The for() function evaluate body and incr while the condition is true.",

                NAME+"( init, condition, incr, body )",

                null,

                "Object",

                false

        );

    }

    @Override

    public boolean isHidden() {

      return 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."); //To change body of generated methods, choose Tools | Templates.

    }

    @Override

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

        int argn = 1;

        Object body = null;

        Object init = getObject(interpreter, args, 0);

        boolean condition = getBoolean(interpreter, args, 1);

        while( condition ) {

            try {

                body = getObject(interpreter, args, 3);

            } catch(BreakException ex) {

                break;

            } catch(ReturnException ex) {

                throw ex;

            } catch(Exception ex) {

                String stmt = "unknown";

                try {

                    stmt = Objects.toString(args);

                } catch(Exception ex2) {

                }

                LOGGER.warn("Error in for function calling arg "+ argn + ", "+ stmt, ex);

                throw ex;

            }

            argn++;

            Object incr = getObject(interpreter, args, 2);

            condition = getBoolean(interpreter, args, 1);

        }

        return body;

    }

}