/*
* Copyright 2013 MovingBlocks
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.terasology.world.generator.internal;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.terasology.engine.SimpleUri;
import org.terasology.engine.module.ModuleManager;
import org.terasology.module.DependencyResolver;
import org.terasology.module.Module;
import org.terasology.module.ModuleEnvironment;
import org.terasology.module.ResolutionResult;
import org.terasology.naming.Name;
import org.terasology.registry.CoreRegistry;
import org.terasology.world.generator.RegisterWorldGenerator;
import org.terasology.world.generator.UnresolvedWorldGeneratorException;
import org.terasology.world.generator.WorldGenerator;
import java.lang.reflect.InvocationTargetException;
import java.util.Collections;
import java.util.List;
/**
* @author Immortius
*/
public class WorldGeneratorManager {
private static final Logger logger = LoggerFactory.getLogger(WorldGeneratorManager.class);
private ImmutableList<WorldGeneratorInfo> generatorInfo;
public WorldGeneratorManager() {
refresh();
}
public void refresh() {
ModuleManager moduleManager = CoreRegistry.get(ModuleManager.class);
List<WorldGeneratorInfo> infos = Lists.newArrayList();
for (Name moduleId : moduleManager.getRegistry().getModuleIds()) {
Module module = moduleManager.getRegistry().getLatestModuleVersion(moduleId);
if (module.isCodeModule()) {
DependencyResolver resolver = new DependencyResolver(moduleManager.getRegistry());
ResolutionResult resolutionResult = resolver.resolve(module.getId());
if (resolutionResult.isSuccess()) {
try (ModuleEnvironment tempEnvironment = moduleManager.loadEnvironment(resolutionResult.getModules(), false)) {
for (Class<?> generatorClass : tempEnvironment.getTypesAnnotatedWith(RegisterWorldGenerator.class)) {
if (tempEnvironment.getModuleProviding(generatorClass).equals(module.getId())) {
RegisterWorldGenerator annotation = generatorClass.getAnnotation(RegisterWorldGenerator.class);
if (isValidWorldGenerator(generatorClass)) {
SimpleUri uri = new SimpleUri(moduleId, annotation.id());
infos.add(new WorldGeneratorInfo(uri, annotation.displayName(), annotation.description()));
} else {
logger.error("{} marked to be registered as a World Generator, but is not a subclass of WorldGenerator or lacks the correct constructor",
generatorClass);
}
}
}
} catch (Exception e) {
logger.error("Error loading world generator in module {}, skipping", module.getId(), e);
}
}
}
}
Collections.sort(infos);
generatorInfo = ImmutableList.copyOf(infos);
}
public List<WorldGeneratorInfo> getWorldGenerators() {
return generatorInfo;
}
public WorldGeneratorInfo getWorldGeneratorInfo(SimpleUri uri) {
for (WorldGeneratorInfo info : generatorInfo) {
if (info.getUri().equals(uri)) {
return info;
}
}
return null;
}
/**
* @param uri
* @return The instantiated world generator.
*/
public WorldGenerator createGenerator(SimpleUri uri) throws UnresolvedWorldGeneratorException {
ModuleManager moduleManager = CoreRegistry.get(ModuleManager.class);
Module module = moduleManager.getEnvironment().get(uri.getModuleName());
if (module == null) {
DependencyResolver resolver = new DependencyResolver(moduleManager.getRegistry());
ResolutionResult result = resolver.resolve(uri.getModuleName());
if (!result.isSuccess()) {
if (moduleManager.getRegistry().getLatestModuleVersion(uri.getModuleName()) == null) {
throw new UnresolvedWorldGeneratorException("Unable to resolve world generator '" + uri + "' - not found");
} else {
throw new UnresolvedWorldGeneratorException("Unable to resolve world generator '" + uri + "' - unable to resolve module dependencies");
}
}
try (ModuleEnvironment environment = moduleManager.loadEnvironment(result.getModules(), false)) {
return searchForWorldGenerator(uri, environment);
}
} else {
return searchForWorldGenerator(uri, moduleManager.getEnvironment());
}
}
private WorldGenerator searchForWorldGenerator(SimpleUri uri, ModuleEnvironment environment) throws UnresolvedWorldGeneratorException {
for (Class<?> generatorClass : environment.getTypesAnnotatedWith(RegisterWorldGenerator.class)) {
RegisterWorldGenerator annotation = generatorClass.getAnnotation(RegisterWorldGenerator.class);
SimpleUri generatorUri = new SimpleUri(environment.getModuleProviding(generatorClass), annotation.id());
if (generatorUri.equals(uri)) {
return loadGenerator(generatorClass, generatorUri);
}
}
throw new UnresolvedWorldGeneratorException("Unable to resolve world generator '" + uri + "' - not found");
}
private WorldGenerator loadGenerator(Class<?> generatorClass, SimpleUri uri) throws UnresolvedWorldGeneratorException {
if (isValidWorldGenerator(generatorClass)) {
try {
return (WorldGenerator) generatorClass.getConstructor(SimpleUri.class).newInstance(uri);
} catch (InstantiationException | IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
throw new UnresolvedWorldGeneratorException("Failed to instantiate world generator '" + uri + "'", e);
}
} else {
throw new UnresolvedWorldGeneratorException(uri + " is not a valid world generator");
}
}
private boolean isValidWorldGenerator(Class<?> generatorClass) {
try {
if (WorldGenerator.class.isAssignableFrom(generatorClass)) {
if (generatorClass.getConstructor(SimpleUri.class) != null) {
return true;
}
}
return false;
// Being generous in catching here, because if the module is broken due to code changes or missing classes the world generator is invalid
} catch (Throwable e) {
return false;
}
}
}