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331 changes: 76 additions & 255 deletions
331
Essentials/src/main/java/com/earth2me/essentials/Essentials.java
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137 changes: 137 additions & 0 deletions
137
Essentials/src/main/java/com/earth2me/essentials/ProviderFactory.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| package com.earth2me.essentials; | ||
|
|
||
| import io.papermc.lib.PaperLib; | ||
| import net.ess3.provider.Provider; | ||
| import net.essentialsx.providers.NullableProvider; | ||
| import net.essentialsx.providers.ProviderData; | ||
| import net.essentialsx.providers.ProviderTest; | ||
| import org.bukkit.plugin.Plugin; | ||
|
|
||
| import java.lang.reflect.Constructor; | ||
| import java.lang.reflect.InvocationTargetException; | ||
| import java.lang.reflect.Method; | ||
| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.logging.Level; | ||
|
|
||
| public class ProviderFactory { | ||
| private final Map<Class<? extends Provider>, Provider> providers = new HashMap<>(); | ||
| private final Map<Class<? extends Provider>, List<Class<? extends Provider>>> registeredProviders = new HashMap<>(); | ||
| private final Essentials essentials; | ||
|
|
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| public ProviderFactory(final Essentials essentials) { | ||
| this.essentials = essentials; | ||
| } | ||
|
|
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| /** | ||
| * Gets the provider which has been selected for the given type. | ||
| * @param providerClass The provider type. | ||
| * @return the provider or null if no provider could be selected for that type. | ||
| */ | ||
| public <P extends Provider> P get(final Class<P> providerClass) { | ||
| final Provider provider = providers.get(providerClass); | ||
| if (provider == null) { | ||
| return null; | ||
| } | ||
| //noinspection unchecked | ||
| return (P) provider; | ||
| } | ||
|
|
||
| @SafeVarargs | ||
| public final void registerProvider(final Class<? extends Provider>... toRegister) { | ||
| for (final Class<? extends Provider> provider : toRegister) { | ||
| final Class<?> superclass = provider.getInterfaces().length > 0 ? provider.getInterfaces()[0] : provider.getSuperclass(); | ||
| if (Provider.class.isAssignableFrom(superclass)) { | ||
| //noinspection unchecked | ||
| registeredProviders.computeIfAbsent((Class<? extends Provider>) superclass, k -> new ArrayList<>()).add(provider); | ||
| if (essentials.getSettings().isDebug()) { | ||
| essentials.getLogger().info("Registered provider " + provider.getSimpleName() + " for " + superclass.getSimpleName()); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
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| public void finalizeRegistration() { | ||
| for (final Map.Entry<Class<? extends Provider>, List<Class<? extends Provider>>> entry : registeredProviders.entrySet()) { | ||
| final Class<? extends Provider> providerClass = entry.getKey(); | ||
| final boolean nullable = providerClass.isAnnotationPresent(NullableProvider.class); | ||
| Class<? extends Provider> highestProvider = null; | ||
| ProviderData highestProviderData = null; | ||
| int highestWeight = -1; | ||
| for (final Class<? extends Provider> provider : entry.getValue()) { | ||
| try { | ||
| final ProviderData providerData = provider.getAnnotation(ProviderData.class); | ||
| if (providerData.weight() > highestWeight && testProvider(provider)) { | ||
| highestWeight = providerData.weight(); | ||
| highestProvider = provider; | ||
| highestProviderData = providerData; | ||
| } | ||
| } catch (final Exception e) { | ||
| essentials.getLogger().log(Level.SEVERE, "Failed to initialize provider " + provider.getName(), e); | ||
| } | ||
| } | ||
|
|
||
| if (highestProvider != null) { | ||
| essentials.getLogger().info("Selected " + highestProviderData.description() + " as the provider for " + providerClass.getSimpleName()); | ||
| providers.put(providerClass, getProviderInstance(highestProvider)); | ||
| } else if (!nullable) { | ||
| throw new IllegalStateException("No provider found for " + providerClass.getName()); | ||
| } else { | ||
| essentials.getLogger().info("No provider found for " + providerClass.getSimpleName() + ", but it is nullable"); | ||
| } | ||
| } | ||
| registeredProviders.clear(); | ||
| } | ||
|
|
||
| private boolean testProvider(final Class<?> providerClass) throws InvocationTargetException, IllegalAccessException { | ||
| try { | ||
| for (final Method method : providerClass.getMethods()) { | ||
| if (method.isAnnotationPresent(ProviderTest.class)) { | ||
| return (Boolean) method.invoke(null); | ||
| } | ||
| } | ||
| return true; | ||
| } catch (final NoClassDefFoundError ignored) { | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| private <P extends Provider> P getProviderInstance(final Class<P> provider) { | ||
| try { | ||
| final Constructor<?> constructor = provider.getConstructors()[0]; | ||
| if (constructor.getParameterTypes().length == 0) { | ||
| //noinspection unchecked | ||
| return (P) constructor.newInstance(); | ||
| } | ||
| final Object[] args = new Object[constructor.getParameterTypes().length]; | ||
|
|
||
| /* | ||
| Providers can have constructors with any of the following types, and this code will automatically supply them; | ||
| - Plugin - The Essentials instance will be passed | ||
| - boolean - True will be passed if this server is running Paper, otherwise false. | ||
| */ | ||
| for (int i = 0; i < args.length; i++) { | ||
| final Class<?> paramType = constructor.getParameterTypes()[i]; | ||
| if (paramType.isAssignableFrom(Plugin.class)) { | ||
| args[i] = essentials; | ||
| } else if (paramType.isAssignableFrom(boolean.class)) { | ||
| args[i] = PaperLib.isPaper(); | ||
| } else { | ||
| throw new IllegalArgumentException("Unsupported parameter type " + paramType.getName()); | ||
| } | ||
| } | ||
|
|
||
| //noinspection unchecked | ||
| return (P) constructor.newInstance(args); | ||
| } catch (InstantiationException | IllegalAccessException | InvocationTargetException e) { | ||
| try { | ||
| return provider.getConstructor().newInstance(); | ||
| } catch (NoSuchMethodException | InvocationTargetException | InstantiationException | IllegalAccessException ex) { | ||
| e.printStackTrace(); | ||
| throw new RuntimeException(ex); | ||
| } | ||
| } | ||
| } | ||
| } |
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