com.excilys.ebi.spring.dbunit.utils.ApplicationContextUtils.java Source code

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Here is the source code for com.excilys.ebi.spring.dbunit.utils.ApplicationContextUtils.java

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/**
 * Copyright 2011-2012 eBusiness Information, Groupe Excilys (www.excilys.com)
 *
 * 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.excilys.ebi.spring.dbunit.utils;

import static org.springframework.util.Assert.isTrue;

import java.util.Map;

import org.springframework.context.ApplicationContext;

public class ApplicationContextUtils {

    private ApplicationContextUtils() {
        throw new UnsupportedOperationException();
    }

    public static <T> T getOptionalUniqueBeanOfType(ApplicationContext applicationContext, Class<T> type) {
        Map<String, T> configs = applicationContext.getBeansOfType(type);

        isTrue(configs.size() <= 1, "found more than one bean in the applicationContext");

        return configs.size() == 1 ? configs.values().iterator().next() : null;
    }

    public static <T> T getOptionalUniqueBeanOfType(ApplicationContext applicationContext, Class<T> type,
            T defaultValue) {

        T bean = getOptionalUniqueBeanOfType(applicationContext, type);
        return bean != null ? bean : defaultValue;
    }
}