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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by both ImageJ and SCIFIO.

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/*
 * #%L
 * SciJava Common shared library for SciJava software.
 * %%
 * Copyright (C) 2009 - 2016 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
 * %%
 * 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.
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 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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package org.scijava.util;

import java.math.BigDecimal;
import java.math.BigInteger;


/**
 * Useful methods for working with {@link Number} objects.
 * 
 * @author Curtis Rueden
 * @author Barry DeZonia
 */
public final class NumberUtils {

	private NumberUtils() {
		// prevent instantiation of utility class
	}

	/**
	 * Converts the given object to a {@link Number} of the specified type, or
	 * null if the types are incompatible.
	 */
	public static Number toNumber(final Object value, final Class type) {
		final Object num = ConversionUtils.convert(value, type);
		return num == null ? null : ConversionUtils.cast(num, Number.class);
	}

	public static BigDecimal asBigDecimal(final Number n) {
		// Using .doubleValue on a long or BigInteger would cause loss of accuracy
		if(BigInteger.class.isInstance(n)){
			return new BigDecimal((BigInteger) n);
		}
		else if(Long.class.isInstance(n)){
			return new BigDecimal(n.longValue());
		}
		return new BigDecimal(n.doubleValue());
	}

	public static BigInteger asBigInteger(final Number n) {
		return BigInteger.valueOf(n.longValue());
	}

	public static Number getMinimumNumber(final Class type) {
		if (ClassUtils.isByte(type)) return Byte.MIN_VALUE;
		if (ClassUtils.isShort(type)) return Short.MIN_VALUE;
		if (ClassUtils.isInteger(type)) return Integer.MIN_VALUE;
		if (ClassUtils.isLong(type)) return Long.MIN_VALUE;
		if (ClassUtils.isFloat(type)) return -Float.MAX_VALUE;
		if (ClassUtils.isDouble(type)) return -Double.MAX_VALUE;
		return null;
	}

	public static Number getMaximumNumber(final Class type) {
		if (ClassUtils.isByte(type)) return Byte.MAX_VALUE;
		if (ClassUtils.isShort(type)) return Short.MAX_VALUE;
		if (ClassUtils.isInteger(type)) return Integer.MAX_VALUE;
		if (ClassUtils.isLong(type)) return Long.MAX_VALUE;
		if (ClassUtils.isFloat(type)) return Float.MAX_VALUE;
		if (ClassUtils.isDouble(type)) return Double.MAX_VALUE;
		return null;
	}

	public static Number getDefaultValue(final Number min, final Number max,
		final Class type)
	{
		if (min != null) return min;
		if (max != null) return max;
		return toNumber("0", type);
	}

	public static Number clampToRange(final Class type, final Number value,
		final Number min, final Number max)
	{
		if (value == null) return getDefaultValue(min, max, type);
		if (Comparable.class.isAssignableFrom(type)) {
			@SuppressWarnings("unchecked")
			final Comparable cValue = (Comparable) value;
			if (min != null && cValue.compareTo(min) < 0) return min;
			if (max != null && cValue.compareTo(max) > 0) return max;
		}
		return value;
	}

}