/*
 * #%L
 * SCIFIO library for reading and converting scientific file formats.
 * %%
 * Copyright (C) 2011 - 2017 SCIFIO developers.
 * %%
 * 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.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * #L%
 */

package io.scif.img;

import io.scif.Metadata;
import io.scif.config.SCIFIOConfig.ImgMode;
import io.scif.img.cell.SCIFIOCellImgFactory;
import io.scif.util.FormatTools;
import io.scif.util.MemoryTools;

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

import net.imagej.axis.Axes;
import net.imglib2.exception.IncompatibleTypeException;
import net.imglib2.img.ImgFactory;
import net.imglib2.img.array.ArrayImgFactory;
import net.imglib2.img.list.ListImgFactory;
import net.imglib2.img.planar.PlanarImgFactory;
import net.imglib2.type.NativeType;

import org.scijava.util.ArrayUtils;

/**
 * Default {@link ImgFactoryHeuristic} implementation. Uses the following
 * heuristic to select a factory:
 * <ul>
 * <li>Check each ImgMode in order</li>
 * <li>If ImgMode.ARRAY, select if dataset size &lt; 2GB</li>
 * <li>If ImgMode.PLANAR, select if plane size &lt; 2GB and dataset fits memory.
 * <li>
 * <li>If ImgMode.CELL, return a SCIFIOCellImgFactory.</li>
 * <li>If ImgMode.AUTO or none of the requested types could be selected, check
 * as though the order were ARRAY -&gt; PLANAR -&gt; CELL.</li>
 * </ul>
 * <p>
 * NB: ImgMode.CELL is always satisfied. Thus to avoid a particular ImgMode,
 * provide a list excluding the undesired types that includes ImgMode.CELL last.
 * </p>
 *
 * @author Mark Hiner
 * @author Curtis Rueden
 */
public class DefaultImgFactoryHeuristic implements ImgFactoryHeuristic {

	// -- Constants --

	// % of available memory to trigger opening as a CellImg, if surpassed
	private static final double MEMORY_THRESHOLD = 0.75;

	// -- ImgFactoryHeuristic API Methods --

	@Override
	@SuppressWarnings({ "rawtypes", "unchecked" })
	public <T> ImgFactory<T> createFactory(final Metadata m,
		final ImgMode[] imgModes, final T type) throws IncompatibleTypeException
	{
		if (!(type instanceof NativeType)) return new ListImgFactory<>(type);
		return createNativeFactory(m, imgModes, (NativeType) type);
	}

	// -- Helper methods --

	private <T extends NativeType<T>> ImgFactory<T> createNativeFactory(
		final Metadata m, final ImgMode[] imgModes, final T type)
		throws IncompatibleTypeException
	{
		// Max size of a plane of a PlanarImg, or total dataset for ArrayImg.
		// 2GB.
		final long maxSize = ArrayUtils.safeMultiply64(2, 1024, 1024, 1024);

		final long availableMem = //
			(long) (MemoryTools.totalAvailableMemory() * MEMORY_THRESHOLD);
		long datasetSize = m.getDatasetSize();

		// check for overflow
		if (datasetSize <= 0) datasetSize = Long.MAX_VALUE;

		// divide by 1024 to compare to max_size and avoid overflow
		final long planeSize = m.get(0).getAxisLength(Axes.X) * //
			m.get(0).getAxisLength(Axes.Y) * //
			FormatTools.getBytesPerPixel(m.get(0).getPixelType());

		final boolean fitsInMemory = availableMem > datasetSize;

		// loop over ImgOptions in preferred order
		final List<ImgMode> modes = new ArrayList<>(Arrays.asList(imgModes));
		modes.add(ImgMode.AUTO);

		for (final ImgMode mode : modes) {
			switch (mode) {
				case AUTO:
					if (!fitsInMemory) return new SCIFIOCellImgFactory<>(type);
					if (datasetSize < maxSize) return new ArrayImgFactory<>(type);
					// FIXME: No CellImgFactory right now.
					// Isn't guaranteed to handle all images well (e.g. RGB).
					//if (planeSize < maxSize) return new PlanarImgFactory<>(type);
					//return new CellImgFactory<>(type);
					return new PlanarImgFactory<>(type);
				case ARRAY:
					if (datasetSize < maxSize && fitsInMemory)
						return new ArrayImgFactory<>(type);
					break;
				case PLANAR:
					if (planeSize < maxSize && fitsInMemory)
						return new PlanarImgFactory<>(type);
					break;
				case CELL:
					// FIXME: No CellImgFactory right now.
					// Isn't guaranteed to handle all images well (e.g. RGB).
					//if (fitsInMemory) return new CellImgFactory<>(type);
					//return new SCIFIOCellImgFactory<>(type);
					return new SCIFIOCellImgFactory<>(type);
			}
		}

		// No compatible modes.
		throw new IncompatibleTypeException(this,
			"Cannot create ImgFactory of type " + type.getClass().getName());
	}
}

@@ -3091,56 +3091,8 @@
 ide%0A
-%09@SuppressWarnings(%7B %22rawtypes%22, %22unchecked%22 %7D)%0A
 %09pub
@@ -3297,22 +3297,123 @@
 ype);%0A%09%09
-return
+@SuppressWarnings(%7B %22cast%22, %22rawtypes%22, %22unchecked%22 %7D)%0A%09%09final ImgFactory%3CT%3E result = //%0A%09%09%09(ImgFactory%3CT%3E)
  createN
@@ -3458,16 +3458,33 @@
  type);%0A
+%09%09return result;%0A
 %09%7D%0A%0A%09// 

Make javac happy with the generics