+++ /dev/null
-/*
- * Reactor - Loader.java - Copyright © 2013 David Roden
- *
- * 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 <http://www.gnu.org/licenses/>.
- */
-
-package net.pterodactylus.reactor.loader;
-
-import java.lang.reflect.Constructor;
-import java.lang.reflect.InvocationTargetException;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.concurrent.TimeUnit;
-
-import net.pterodactylus.reactor.Action;
-import net.pterodactylus.reactor.Filter;
-import net.pterodactylus.reactor.Query;
-import net.pterodactylus.reactor.Reaction;
-import net.pterodactylus.reactor.Trigger;
-import net.pterodactylus.reactor.loader.Chain.Parameter;
-import net.pterodactylus.reactor.loader.Chain.Part;
-
-/**
- * Creates {@link Reaction}s from {@link Chain}s.
- *
- * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
- */
-public class ReactionLoader {
-
- /**
- * Creates a {@link Reaction} from the given {@link Chain}.
- *
- * @param chain
- * The chain to create a reaction from
- * @return The created reaction
- * @throws LoaderException
- * if a class can not be loaded
- */
- @SuppressWarnings("static-method")
- public Reaction loadReaction(Chain chain) throws LoaderException {
-
- /* check if chain is enabled. */
- if (!chain.enabled()) {
- throw new IllegalArgumentException("Chain is not enabled.");
- }
-
- /* create query. */
- Query query = createObject(chain.query().name(), "net.pterodactylus.reactor.queries", extractParameters(chain.query().parameters()));
-
- /* create filters. */
- List<Filter> filters = new ArrayList<Filter>();
- for (Part filterPart : chain.filters()) {
- filters.add(ReactionLoader.<Filter> createObject(filterPart.name(), "net.pterodactylus.reactor.filters", extractParameters(filterPart.parameters())));
- }
-
- /* create trigger. */
- Trigger trigger = createObject(chain.trigger().name(), "net.pterodactylus.reactor.triggers", extractParameters(chain.trigger().parameters()));
-
- /* create action. */
- Action action = createObject(chain.action().name(), "net.pterodactylus.reactor.actions", extractParameters(chain.action().parameters()));
-
- return new Reaction(chain.name(), query, filters, trigger, action).setUpdateInterval(TimeUnit.SECONDS.toMillis(chain.updateInterval()));
- }
-
- //
- // STATIC METHODS
- //
-
- /**
- * Extracts all parameter values from the given parameters.
- *
- * @param parameters
- * The parameters to extract the values from
- * @return The extracted values
- */
- private static List<String> extractParameters(List<Parameter> parameters) {
- List<String> parameterValues = new ArrayList<String>();
-
- for (Parameter parameter : parameters) {
- parameterValues.add(parameter.value());
- }
-
- return parameterValues;
- }
-
- /**
- * Creates a new object.
- * <p>
- * First, {@code className} is used to try to load a {@link Class} with that
- * name. If that fails, {@code packageName} is prepended to the class name.
- * If no class can be found, a {@link LoaderException} will be thrown.
- * <p>
- * If a class could be located using the described method, a constructor
- * will be searched that has the same number of {@link String} parameters as
- * the given parameters. The parameters from the given parameters are then
- * used in a constructor call to create the new object.
- *
- * @param className
- * The name of the class
- * @param packageName
- * The optional name of the package to prepend
- * @param parameters
- * The parameters for the constructor call
- * @return The created object
- * @throws LoaderException
- * if the object can not be created
- */
- @SuppressWarnings("unchecked")
- private static <T> T createObject(String className, String packageName, List<String> parameters) throws LoaderException {
-
- /* try to load class without package name. */
- Class<?> objectClass = null;
- try {
- objectClass = Class.forName(className);
- } catch (ClassNotFoundException cnfe1) {
- /* ignore, we’ll try again. */
- }
-
- if (objectClass == null) {
- try {
- objectClass = Class.forName(packageName + "." + className);
- } catch (ClassNotFoundException cnfe1) {
- /* okay, now we need to throw. */
- throw new LoaderException(String.format("Could find neither class “%s” nor class “%s.”", className, packageName + "." + className), cnfe1);
- }
- }
-
- /* locate an eligible constructor. */
- Constructor<?> wantedConstructor = null;
- for (Constructor<?> constructor : objectClass.getConstructors()) {
- Class<?>[] parameterTypes = constructor.getParameterTypes();
- if (parameterTypes.length != parameters.size()) {
- continue;
- }
- boolean compatibleTypes = true;
- for (Class<?> parameterType : parameterTypes) {
- if (parameterType != String.class) {
- compatibleTypes = false;
- break;
- }
- }
- if (!compatibleTypes) {
- continue;
- }
- wantedConstructor = constructor;
- }
-
- if (wantedConstructor == null) {
- throw new LoaderException("Could not find eligible constructor.");
- }
-
- try {
- return (T) wantedConstructor.newInstance(parameters.toArray());
- } catch (IllegalArgumentException iae1) {
- throw new LoaderException("Could not invoke constructor.", iae1);
- } catch (InstantiationException ie1) {
- throw new LoaderException("Could not invoke constructor.", ie1);
- } catch (IllegalAccessException iae1) {
- throw new LoaderException("Could not invoke constructor.", iae1);
- } catch (InvocationTargetException ite1) {
- throw new LoaderException("Could not invoke constructor.", ite1);
- }
-
- }
-
-}
projects / rhynodge.git / blobdiff