com.threewks.thundr.module.ModulesModule.java Source code

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Here is the source code for com.threewks.thundr.module.ModulesModule.java

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/*
 * This file is a component of thundr, a software library from 3wks.
 * Read more: http://3wks.github.io/thundr/
 * Copyright (C) 2014 3wks, <thundr@3wks.com.au>
 *
 * 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 com.threewks.thundr.module;

import org.apache.commons.lang3.StringUtils;

import com.threewks.thundr.injection.BaseModule;
import com.threewks.thundr.injection.Module;
import com.threewks.thundr.injection.UpdatableInjectionContext;

public class ModulesModule extends BaseModule {
    public static final String ApplicationClassProperty = "applicationModule";
    private static final String ApplicationModule = "ApplicationModule";

    public ModulesModule() {
    }

    @Override
    public void initialise(UpdatableInjectionContext injectionContext) {
        Modules modules = injectionContext.get(Modules.class);
        Class<? extends Module> applicationModule = loadApplicationModule(injectionContext);
        modules.addModule(applicationModule);
    }

    @SuppressWarnings("unchecked")
    protected Class<? extends Module> loadApplicationModule(UpdatableInjectionContext injectionContext) {
        String className = StringUtils.defaultString(injectionContext.get(String.class, ApplicationClassProperty),
                ApplicationModule);
        Class<?> type = null;
        try {
            type = Class.forName(className);
        } catch (Exception e) {
            throw new ModuleLoadingException(
                    "Failed to load the application module. You must provide an implementation of '%s', either as '%s' in the default package, or you can specify the full class name in the configuration property '%s'.",
                    Module.class.getName(), ApplicationModule, ApplicationClassProperty);
        }
        if (Module.class.isAssignableFrom(type)) {
            return (Class<? extends Module>) type;
        } else {
            throw new ModuleLoadingException("Failed to load the application module. '%s' does not implement '%s'",
                    type.getName(), Module.class.getName());
        }
    }
}