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/*
* #%L
* SciJava Common shared library for SciJava software.
* %%
* Copyright (C) 2009 - 2026 SciJava 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 org.scijava;
/**
* Constants for specifying an item's priority.
*
* @author Johannes Schindelin
* @author Curtis Rueden
* @see org.scijava.Prioritized#getPriority()
* @see org.scijava.plugin.Plugin#priority()
*/
public final class Priority {
private Priority() {
// prevent instantiation of utility class
}
/**
* Priority for items that must be sorted first.
* <p>
* Note that it <em>is</em> still possible to prioritize something earlier
* than this value (e.g., for testing purposes), although doing so strongly
* discouraged in production.
* </p>
*/
public static final double FIRST = +1e300;
/** Priority for items that very strongly prefer to be sorted early. */
public static final double EXTREMELY_HIGH = +1000000;
/** Priority for items that strongly prefer to be sorted early. */
public static final double VERY_HIGH = +10000;
/** Priority for items that prefer to be sorted earlier. */
public static final double HIGH = +100;
/** Default priority for items. */
public static final double NORMAL = 0;
/** Priority for items that prefer to be sorted later. */
public static final double LOW = -100;
/** Priority for items that strongly prefer to be sorted late. */
public static final double VERY_LOW = -10000;
/** Priority for items that very strongly prefer to be sorted late. */
public static final double EXTREMELY_LOW = -1000000;
/** Priority for items that must be sorted last.
* <p>
* Note that it <em>is</em> still possible to prioritize something later
* than this value (e.g., for testing purposes), although doing so strongly
* discouraged in production.
* </p>
*/
public static final double LAST = -1e300;
/**
* Compares two {@link Prioritized} objects.
* <p>
* Note: this method provides a natural ordering that may be inconsistent with
* equals. That is, two unequal objects may often have the same priority, and
* thus return 0 when compared in this fashion. Hence, if this method is used
* as a basis for implementing {@link Comparable#compareTo} or
* {@link java.util.Comparator#compare}, that implementation may want to
* impose logic beyond that of this method, for breaking ties, if a total
* ordering consistent with equals is always required.
* </p>
*
* @return -1 if {@code p1}'s priority is higher than {@code p2}'s, 1 if
* {@code p2}'s priority is higher than {@code p1}'s, or 0 if they
* have the same priority.
* @see org.scijava.util.ClassUtils#compare(Class, Class)
*/
public static int compare(final Prioritized p1, final Prioritized p2) {
final double priority1 =
p1 == null ? Double.NEGATIVE_INFINITY : p1.getPriority();
final double priority2 =
p2 == null ? Double.NEGATIVE_INFINITY : p2.getPriority();
if (priority1 == priority2) return 0;
// NB: We invert the ordering here, so that large values come first,
// rather than the typical natural ordering of smaller values first.
return priority1 > priority2 ? -1 : 1;
}
/**
* Injects the specified priority into the given object. Note that this is
* only possible if the given object implements the {@link Prioritized}
* interface.
*
* @param o The object to which the priority should be assigned.
* @return true If the priority was successfully injected.
*/
public static boolean inject(final Object o, final double priority) {
if (!(o instanceof Prioritized)) return false;
((Prioritized) o).setPriority(priority);
return true;
}
// -- Deprecated --
/** @deprecated Use {@link #FIRST} instead. */
@Deprecated
public static final double FIRST_PRIORITY = Double.POSITIVE_INFINITY;
/** @deprecated Use {@link #VERY_HIGH} instead. */
@Deprecated
public static final double VERY_HIGH_PRIORITY = +10000;
/** @deprecated Use {@link #HIGH} instead. */
@Deprecated
public static final double HIGH_PRIORITY = +100;
/** @deprecated Use {@link #NORMAL} instead. */
@Deprecated
public static final double NORMAL_PRIORITY = 0;
/** @deprecated Use {@link #LOW} instead. */
@Deprecated
public static final double LOW_PRIORITY = -100;
/** @deprecated Use {@link #VERY_LOW} instead. */
@Deprecated
public static final double VERY_LOW_PRIORITY = -10000;
/** @deprecated Use {@link #LAST} instead. */
@Deprecated
public static final double LAST_PRIORITY = Double.NEGATIVE_INFINITY;
}