Application: gvSIG desktop

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

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.ExpressionRuntimeException;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

public class ImageResizeFunction extends AbstractFunction {

    public ImageResizeFunction() {

        super(

                "Image", "IMAGERESIZE", Range.between(1, 3),

                "Resize an image, specifing a scale factor or a with and height",

                "IMAGERESIZE({{image}}, factor)",

                new String[]{

                    "image",

                    "factor",

                    "width",

                    "height"

                },

                "SimpleImage",

                false

        );

    }

    @Override

    public boolean allowConstantFolding() {

        return true;

    }

    @Override

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

        Object arg0 = this.getObject(args, 0);

        SimpleImage image = ImageReadFunction.createSimpleImage(arg0);

        if( image.isEmpty() ) {

            return null;

        }

        switch(args.length) {

            case 2:

                double factor = this.getDouble(args, 1);

                image = image.resize(factor);

                break;

            case 3:

                int width = this.getInt(args, 1);

                int height = this.getInt(args, 2);

                image = image.resize(width, height);

                break;

            default:

                throw new ExpressionRuntimeException(

                        null, 

                        "Incorrect number of arguments", 

                        "The IMAGERESIZE function has 2 arguments, the image and a scale factor, or 3, the image, width and height"

                );

        }

        return image;

    }

}