Application: gvSIG desktop

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

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

public class ImageReadFunction extends AbstractFunction {

    public ImageReadFunction() {

        super(

                "Image", "IMAGEREAD", Range.is(1),

                "Read an image from a data source and return it as a SimpleImage object.\n"

                + "The data source of the image can be:\n<ul>"

                + "<li>A byte array</li>"

                + "<li>A URL</li>"

                + "<li>A FILE</li>"

                + "<li>A hexadecimal coded string</li>"

                + "<li>A base64 coded string</li>"

                + "</ul>",

                "IMAGEREAD({{source}})",

                new String[]{

                    "Value from which to load the image"

                },

                "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;

        }

        return image;

    }

    public static SimpleImage createSimpleImage(Object source) {

        if( source instanceof SimpleImage ) {

          return (SimpleImage) source;

        }

        SimpleImage image = new SimpleImage(source);

        return image;

    }

}