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Jiffle is a raster algebra language that can be used to create new images from logical and mathematical expressions involving source images and user defined variables. It is intended to let users concentrate on algorithms rather than tedious boiler-plate code.

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/*
 * Copyright 2011 Michael Bedward
 * 
 * This file is part of jai-tools.
 *
 * jai-tools is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the 
 * License, or (at your option) any later version.
 *
 * jai-tools is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public 
 * License along with jai-tools.  If not, see .
 * 
 */

package jaitools.jiffle.runtime;

import java.awt.image.RenderedImage;

import java.util.ArrayList;
import java.util.List;

/**
 * The default abstract base class for runtime classes that implement
 * indirect evaluation.
 *
 * @author Michael Bedward
 * @since 1.1
 * @version $Id: AbstractIndirectRuntime.java 1383 2011-02-10 11:22:29Z michael.bedward $
 */
public abstract class AbstractIndirectRuntime extends AbstractJiffleRuntime implements JiffleIndirectRuntime {
    
    /* 
     * Note: not using generics here because they are not
     * supported by the Janino compiler.
     */
    List sourceImageNames = new ArrayList();
    String destImageName;

    /** Processing bounds min X ordinate */
    protected int _minx;

    /** Processing bounds min Y ordinate */
    protected int _miny;

    /** Processing bounds width */
    protected int _width;

    /** Processing bounds height */
    protected int _height;

    public void setDestinationImage(String imageName) {
        destImageName = imageName;
    }

    public void setSourceImage(String imageName, RenderedImage image) {
        sourceImageNames.add(imageName);
    }

    public void setBounds(int minx, int miny, int width, int height) {
        _minx = minx;
        _miny = miny;
        _width = width;
        _height = height;

        initImageScopeVars();
    }

    public double readFromImage(String srcImageName, int x, int y, int band) {
        throw new UnsupportedOperationException("Not supported yet.");
    }

    /**
     * Initializes image-scope variables. These are fields in the runtime class.
     * They are initialized in a separate method rather than the constructor
     * because they may depend on expressions involving values that are not
     * known until the processing area is set (e.g. Jiffle's width() function).
     */
    protected abstract void initImageScopeVars();

}