Application: gvSIG desktop

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

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.RenderingHints;

import java.awt.geom.AffineTransform;

import java.awt.image.BufferedImage;

import java.io.ByteArrayInputStream;

import java.io.File;

import java.io.IOException;

import java.net.URL;

import javax.imageio.ImageIO;

import org.apache.commons.codec.DecoderException;

import org.apache.commons.codec.binary.Base64;

import org.apache.commons.codec.binary.Hex;

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 'Java BufferedImage' 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"

                },

                "BufferedImage",

                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.getBufferedImage();

    }

    public static SimpleImage createSimpleImage(Object source) {

        SimpleImage image = new SimpleImage(source);

        return image;

    }

}