/*
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 * ImageJ software for multidimensional image processing and analysis.
 * %%
 * Copyright (C) 2014 - 2016 Board of Regents of the University of
 * Wisconsin-Madison, University of Konstanz and Brian Northan.
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 *    this list of conditions and the following disclaimer.
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package net.imagej.ops.geom;

import net.imagej.ops.Ops;
import net.imagej.ops.special.chain.RTs;
import net.imagej.ops.special.function.AbstractUnaryFunctionOp;
import net.imagej.ops.special.function.Functions;
import net.imagej.ops.special.function.UnaryFunctionOp;
import net.imglib2.type.numeric.real.DoubleType;

/**
 * Generic implementation of
 * {@link net.imagej.ops.Ops.Geometric.Boxivity}.
 * 
 * @author Tim-Oliver Buchholz, University of Konstanz.
 */
public abstract class AbstractBoxivity<I> extends
	AbstractUnaryFunctionOp<I, DoubleType> implements Ops.Geometric.Boxivity
{

	private UnaryFunctionOp<I, DoubleType> areaFunc;

	private UnaryFunctionOp<I, I> smallestEnclosingRectangleFunc;

	private Class<I> inType;

	public AbstractBoxivity(final Class<I> inType) {
		this.inType = inType;
	}

	@Override
	public void initialize() {
		areaFunc = RTs.function(ops(), Ops.Geometric.Size.class, in());
		smallestEnclosingRectangleFunc = Functions.unary(ops(), 
			Ops.Geometric.SmallestEnclosingBoundingBox.class, inType, in());
	}

	@Override
	public DoubleType compute1(final I input) {
		return new DoubleType(areaFunc.compute1(input).getRealDouble() / areaFunc
			.compute1(smallestEnclosingRectangleFunc.compute1(input)).getRealDouble());
	}

}
