/*
* This file is part of LanternServer, licensed under the MIT License (MIT).
*
* Copyright (c) LanternPowered <https://www.lanternpowered.org>
* Copyright (c) SpongePowered <https://www.spongepowered.org>
* Copyright (c) contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the Software), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.lanternpowered.server.attribute;
import com.google.common.collect.Lists;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
public class LanternAttributeCalculator {
public double calculateValue(double base, Collection<LanternAttributeModifier> modifiers) {
List<LanternAttributeModifier> modifiers0 = Lists.newArrayList(modifiers);
// Sort the modifiers by operation priority
Collections.sort(modifiers0, (m1, m2) -> m1.getOperation().compareTo(m2.getOperation()));
// The last operation
LanternOperation lastOperation = null;
// The new value
double value = base;
double value0 = 0;
// Add the incrementations of all the modifiers
for (LanternAttributeModifier modifier : modifiers) {
LanternOperation operation = modifier.getOperation();
if (lastOperation == null || operation.equals(lastOperation)) {
double value1 = operation.getIncrementation(base, modifier.getValue(), value);
if (operation.changeValueImmediately()) {
value += value1;
} else {
value0 += value1;
}
} else {
lastOperation = operation;
value += value0;
value0 = 0;
}
}
value += value0;
return value;
}
}