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MjAPI.java
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MjAPI.java
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/**
* Copyright (c) 2011-2014, SpaceToad and the BuildCraft Team
* http://www.mod-buildcraft.com
*
* BuildCraft is distributed under the terms of the Minecraft Mod Public
* License 1.0, or MMPL. Please check the contents of the license located in
* http://www.mod-buildcraft.com/MMPL-1.0.txt
*/
package buildcraft.api.mj;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
import buildcraft.api.core.JavaTools;
public final class MjAPI {
private static Map<Class, BatteryField> MjBatteries = new HashMap<Class, BatteryField>();
private enum BatteryKind {
Value, Container
}
private static class BatteryField {
Field field;
MjBattery battery;
BatteryKind kind;
}
public interface IBatteryProvider {
BatteryObject getMjBattery();
}
public static class BatteryObject {
private Field f;
private Object o;
private MjBattery b;
/**
* @return Current energy requirement for keeping machine state
*/
public double getEnergyRequested() {
try {
double contained = f.getDouble(o);
double max = b.maxCapacity();
return Math.max(Math.min(max - contained, b.maxReceivedPerCycle()), b.minimumConsumption());
} catch (IllegalAccessException e) {
e.printStackTrace();
}
return 0;
}
/**
* Add energy to this battery
*
* @param mj Energy amount
* @return Used energy
*/
public double addEnergy(double mj) {
return addEnergy(mj, false);
}
/**
* Add energy to this battery
*
* @param mj Energy amount
* @param ignoreCycleLimit Force add all energy even if "maxReceivedPerCycle" limit is reached
* @return Used energy
*/
public double addEnergy(double mj, boolean ignoreCycleLimit) {
try {
double contained = f.getDouble(o);
double maxAccepted = b.maxCapacity() - contained + b.minimumConsumption();
if (!ignoreCycleLimit && maxAccepted > b.maxReceivedPerCycle()) {
maxAccepted = b.maxReceivedPerCycle();
}
double used = Math.min(maxAccepted, mj);
if (used > 0) {
f.setDouble(o, Math.min(contained + used, b.maxCapacity()));
return used;
}
} catch (IllegalAccessException e) {
e.printStackTrace();
}
return 0;
}
/**
* @return Current stored energy amount in this battery
*/
public double getEnergyStored() {
try {
return f.getDouble(o);
} catch (IllegalAccessException e) {
e.printStackTrace();
return 0;
}
}
/**
* Set current stored energy amount.
* Doesn't use it for your machines! Decrease your battery field directly.
*
* @param mj New energy amount
*/
public void setEnergyStored(double mj) {
try {
f.setDouble(o, mj);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
/**
* Can be overrided via {@link #reconfigure(double, double, double)}
*
* @return Maximal energy amount for this battery.
*/
public double maxCapacity() {
return b.maxCapacity();
}
/**
* Can be overrided via {@link #reconfigure(double, double, double)}
*
* @return Minimal energy amount for keep your machine in active state
*/
public double minimumConsumption() {
return b.minimumConsumption();
}
/**
* Can be overrided via {@link #reconfigure(double, double, double)}
*
* @return Maximal energy received per one tick
*/
public double maxReceivedPerCycle() {
return b.maxReceivedPerCycle();
}
/**
* Allow to dynamically reconfigure your battery.
* Usually it's not very good change battery parameters for already present machines, but if you want...
*
* @param maxCapacity {@link #maxCapacity()}
* @param maxReceivedPerCycle {@link #maxReceivedPerCycle()}
* @param minimumConsumption {@link #minimumConsumption()}
* @return Current battery object instance
*/
public BatteryObject reconfigure(final double maxCapacity, final double maxReceivedPerCycle, final double minimumConsumption) {
b = new MjBattery() {
@Override
public double maxCapacity() {
return maxCapacity;
}
@Override
public double maxReceivedPerCycle() {
return maxReceivedPerCycle;
}
@Override
public double minimumConsumption() {
return minimumConsumption;
}
@Override
public Class<? extends Annotation> annotationType() {
return MjBattery.class;
}
};
return this;
}
}
/**
* Deactivate constructor
*/
private MjAPI() {
}
public static BatteryObject getMjBattery(Object o) {
if (o == null) {
return null;
}
if (o instanceof IBatteryProvider) {
BatteryObject battery = ((IBatteryProvider) o).getMjBattery();
if (battery != null) {
return battery;
}
}
BatteryField f = getMjBatteryField(o.getClass());
if (f == null) {
return null;
} else if (f.kind == BatteryKind.Value) {
BatteryObject obj = new BatteryObject();
obj.o = o;
obj.f = f.field;
obj.b = f.battery;
return obj;
} else {
try {
return getMjBattery(f.field.get(o));
} catch (IllegalAccessException e) {
e.printStackTrace();
return null;
}
}
}
private static BatteryField getMjBatteryField(Class c) {
BatteryField bField = MjBatteries.get(c);
if (bField == null) {
for (Field f : JavaTools.getAllFields(c)) {
MjBattery battery = f.getAnnotation(MjBattery.class);
if (battery != null) {
f.setAccessible(true);
bField = new BatteryField();
bField.field = f;
bField.battery = battery;
if (double.class.equals(f.getType())) {
bField.kind = BatteryKind.Value;
} else if (f.getType().isPrimitive()) {
throw new RuntimeException(
"MJ battery needs to be object or double type");
} else {
bField.kind = BatteryKind.Container;
}
MjBatteries.put(c, bField);
return bField;
}
}
MjBatteries.put(c, null);
}
return bField;
}
}