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A multidimensional, type-agnostic image processing library.
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/*
 * #%L
 * ImgLib2: a general-purpose, multidimensional image processing library.
 * %%
 * Copyright (C) 2009 - 2020 Tobias Pietzsch, Stephan Preibisch, Stephan Saalfeld,
 * John Bogovic, Albert Cardona, Barry DeZonia, Christian Dietz, Jan Funke,
 * Aivar Grislis, Jonathan Hale, Grant Harris, Stefan Helfrich, Mark Hiner,
 * Martin Horn, Steffen Jaensch, Lee Kamentsky, Larry Lindsey, Melissa Linkert,
 * Mark Longair, Brian Northan, Nick Perry, Curtis Rueden, Johannes Schindelin,
 * Jean-Yves Tinevez and Michael Zinsmaier.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
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 *    this list of conditions and the following disclaimer in the documentation
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package net.imglib2.util;

import net.imglib2.Interval;
import net.imglib2.Point;
import net.imglib2.RandomAccess;
import net.imglib2.RandomAccessible;
import net.imglib2.RandomAccessibleInterval;
import net.imglib2.RealInterval;
import net.imglib2.RealPoint;
import net.imglib2.RealRandomAccess;
import net.imglib2.RealRandomAccessible;
import net.imglib2.view.Views;

public class ConstantUtils
{
	public static < T > RandomAccessible< T > constantRandomAccessible( final T constant, final int numDimensions )
	{
		return new RandomAccessible< T >()
		{
			@Override
			public int numDimensions()
			{
				return numDimensions;
			}

			final class ConstantRandomAccess extends Point implements RandomAccess< T >
			{
				public ConstantRandomAccess()
				{
					super( numDimensions );
				}

				@Override
				public T get()
				{
					return constant;
				}

				@Override
				public ConstantRandomAccess copy()
				{
					return new ConstantRandomAccess();
				}

				@Override
				public ConstantRandomAccess copyRandomAccess()
				{
					return copy();
				}
			}

			@Override
			public RandomAccess< T > randomAccess()
			{
				return new ConstantRandomAccess();
			}

			@Override
			public RandomAccess< T > randomAccess( final Interval interval )
			{
				return randomAccess();
			}
		};
	}

	public static < T > RandomAccessibleInterval< T > constantRandomAccessibleInterval( final T constant, final Interval interval )
	{
		return Views.interval( constantRandomAccessible( constant, interval.numDimensions() ), interval );
	}

	@Deprecated
	public static < T > RandomAccessibleInterval< T > constantRandomAccessibleInterval( final T constant, final int numDimensions, final Interval interval )
	{
		return Views.interval( constantRandomAccessible( constant, numDimensions ), interval );
	}

	public static < T > RealRandomAccessible< T > constantRealRandomAccessible( final T constant, final int numDimensions )
	{
		return new RealRandomAccessible< T >()
		{
			@Override
			public int numDimensions()
			{
				return numDimensions;
			}

			final class ConstantRealRandomAccess extends RealPoint implements RealRandomAccess< T >
			{
				public ConstantRealRandomAccess()
				{
					super( numDimensions );
				}

				@Override
				public T get()
				{
					return constant;
				}

				@Override
				public ConstantRealRandomAccess copy()
				{
					return new ConstantRealRandomAccess();
				}

				@Override
				public ConstantRealRandomAccess copyRealRandomAccess()
				{
					return copy();
				}
			}

			@Override
			public ConstantRealRandomAccess realRandomAccess()
			{
				return new ConstantRealRandomAccess();
			}

			@Override
			public ConstantRealRandomAccess realRandomAccess( final RealInterval interval )
			{
				return realRandomAccess();
			}
		};
	}
}