org.reusables.test.SpringTestUtils.java Source code

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Here is the source code for org.reusables.test.SpringTestUtils.java

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/*
 * Copyright 2010-2012 the original author or authors.
 *
 * 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.reusables.test;

import org.apache.commons.lang.Validate;
import org.springframework.context.ApplicationContext;

/**
 * Utilities for the Springframework when unit testing.
 * 
 * @author marcel
 **/
public final class SpringTestUtils {
    private SpringTestUtils() {
        // Util class.
    }

    /**
     * Get a single bean form the context with the given type.
     * 
     * @param <T> Type of the bean.
     * @param ctx The Spring context.
     * @param type Type of the bean.
     * @return The bean with the given type.
     */
    public static <T> T getBeanByType(final ApplicationContext ctx, final Class<T> type) {
        final String[] names = ctx.getBeanNamesForType(type);
        Validate.isTrue(names.length == 1,
                "Number of beans of type '" + type.getName() + "' found: " + names.length);
        return (T) ctx.getBean(names[0]);
    }

    /**
     * Find a single bean form the context with the given type.
     * 
     * @param <T> Type of the bean.
     * @param ctx The Spring context.
     * @param type Type of the bean.
     * @return The bean with the given type, or null if not exactly one bean of the given type was present.
     */
    public static <T> T findBeanByType(final ApplicationContext ctx, final Class<T> type) {
        final String[] names = ctx.getBeanNamesForType(type);
        return names.length == 1 ? (T) ctx.getBean(names[0]) : null;
    }
}