68 lines
2.4 KiB
Java
68 lines
2.4 KiB
Java
/*
|
|
* PlotSquared, a land and world management plugin for Minecraft.
|
|
* Copyright (C) IntellectualSites <https://intellectualsites.com>
|
|
* Copyright (C) IntellectualSites team and contributors
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
package com.plotsquared.core.util;
|
|
|
|
import com.sk89q.worldedit.internal.expression.Expression;
|
|
import org.checkerframework.checker.nullness.qual.NonNull;
|
|
|
|
/**
|
|
* An expression that can be evaluated.
|
|
* Evaluation is thread-safe.
|
|
* This is a wrapper for {@link Expression}.
|
|
*/
|
|
public class PlotExpression {
|
|
|
|
private final Expression expression;
|
|
private final Object lock = new Object();
|
|
|
|
private PlotExpression(final @NonNull String rawExpression, final @NonNull String @NonNull [] variableNames) {
|
|
this.expression = Expression.compile(rawExpression, variableNames);
|
|
}
|
|
|
|
/**
|
|
* Compiles an expression from a string.
|
|
*
|
|
* @param expression the expression to compile.
|
|
* @param variableNames the variables that can be set in {@link #evaluate(double...)}.
|
|
* @return the compiled expression.
|
|
*/
|
|
public static @NonNull PlotExpression compile(
|
|
final @NonNull String expression,
|
|
final @NonNull String @NonNull ... variableNames
|
|
) {
|
|
return new PlotExpression(expression, variableNames);
|
|
}
|
|
|
|
/**
|
|
* Evaluates the expression with the given variable values.
|
|
*
|
|
* @param values the values to set the variables to.
|
|
* @return the result of the evaluation.
|
|
*/
|
|
public double evaluate(double... values) {
|
|
double evaluate;
|
|
// synchronization is likely the best option in terms of memory and cpu consumption
|
|
synchronized (this.lock) {
|
|
evaluate = this.expression.evaluate(values);
|
|
}
|
|
return evaluate;
|
|
}
|
|
|
|
}
|