Application: gvSIG desktop

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

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.Code;

import org.gvsig.expressionevaluator.Codes;

import org.gvsig.expressionevaluator.Formatter;

import org.gvsig.expressionevaluator.Function;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

public class BreakFunction extends AbstractFunction {

    public static final String NAME = "BREAK";

    public BreakFunction() {

        super(Function.GROUP_PROGRAMMING, 

                NAME, 

                Range.between(0, Integer.MAX_VALUE),

                null,

                "BREAK {{value}}",

                null,

                "Object",

                false

        );

    }

    @Override

    public boolean isHidden() {

      return true;

    }

    @Override

    public boolean allowConstantFolding() {

        return false;

    }

    @Override

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

        switch(args.length) {

            case 0:

                throw new BreakException(null);

            case 1:

                throw new BreakException(args[0]);

            default:

                throw new BreakException(args);

        }

    }

    public static class BreakException extends RuntimeException {

        private final Object value;

        public BreakException(Object value) {

            this.value = value;

        }

        public Object getValue() {

            return this.value;

        }

    }

    @Override

    public String toString(Codes args, Formatter<Code> formatter) {

        StringBuilder builder = new StringBuilder();

        builder.append("BREAK");

        return builder.toString();

    }

}