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wavemaker-commons-util
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/**
 * Copyright (C) 2020 WaveMaker, Inc.
 * 
 * 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.wavemaker.commons.util;

import java.io.File;

import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
import org.springframework.context.support.GenericApplicationContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;

/**
 * Helper methods for initializing and configuring Spring.
 * 
 * @author Simon Toens
 */
public abstract class SpringUtils {

    private SpringUtils() {
    }

    /**
     * Initializes Spring with config.xml. Statically initializes com.wavemaker.commons.i18n.ResourceManager, used for msg
     * lookup.
     * 
     * When running outside of a webapp container, this method needs to run once at startup before accessing Resources
     * defined in com.wavemaker.commons.Resource.
     */
    public static GenericApplicationContext initSpringConfig() {
        return initSpringConfig(true);
    }

    public static Object getBean(File cfg, String beanName) {
        return getBean(new FileSystemResource(cfg), beanName);
    }

    public static Object getBean(String cfg, String beanName) {
        return getBean(new ClassPathResource(cfg), beanName);
    }

    public static Object getBean(Resource resource, String beanName) {
        GenericApplicationContext ctx = initSpringConfig(false);
        XmlBeanDefinitionReader xmlReader = new XmlBeanDefinitionReader(ctx);
        xmlReader.loadBeanDefinitions(resource);
        ctx.refresh();
        return ctx.getBean(beanName);
    }

    private static GenericApplicationContext initSpringConfig(boolean refresh) {
        GenericApplicationContext ctx = new GenericApplicationContext();
        XmlBeanDefinitionReader xmlReader = new XmlBeanDefinitionReader(ctx);
        xmlReader.loadBeanDefinitions(new ClassPathResource("config.xml"));

        if (refresh) {
            ctx.refresh();
        }

        return ctx;
    }

    public static void throwSpringNotInitializedError(Class uninitializedBean) {
        throw new AssertionError("Spring has not initialized " + uninitializedBean.getName());
    }

}