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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 downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.

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/*
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 * SciJava Common shared library for SciJava software.
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 * 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.
 * %%
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 * 
 * 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
 *    and/or other materials provided with the distribution.
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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;
	}

}