/**
 * Licensed to Jasig under one or more contributor license
 * agreements. See the NOTICE file distributed with this work
 * for additional information regarding copyright ownership.
 * Jasig licenses this file to you 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.apache.tapestry5.jcache.internal;

// import org.jsr107.tck.testutil.AbstractTestExcluder;
import java.util.Iterator;
import java.util.ServiceLoader;

import javax.cache.annotation.BeanProvider;

import org.junit.Rule;
import org.junit.rules.MethodRule;

/**
 * Base class that ALL annotation/interceptor tests MUST extend from
 * 
 * @author Eric Dalquist
 * @version $Revision$
 */
@SuppressWarnings("deprecation")
public class AbstractInterceptionTest
{
    private static final BeanProvider beanProvider;

    static
    {
        BeanProvider localBeanProvider = null;
        try
        {
            final ServiceLoader<BeanProvider> serviceLoader = ServiceLoader
                    .load(BeanProvider.class);
            final Iterator<BeanProvider> it = serviceLoader.iterator();
            localBeanProvider = it.hasNext() ? it.next() : null;
        }
        catch (Throwable t)
        {
            // ignore
            System.err
                    .println("Failed to load BeanProvider SPI impl, annotation tests will be ignored");
            t.printStackTrace(System.err);
        }

        beanProvider = localBeanProvider;
    }

    /**
     * Rule used to exclude tests that do not implement Annotations
     */
    @Rule
    public final MethodRule rule = new AbstractTestExcluder()
    {
        @Override
        protected boolean isExcluded(String methodName)
        {
            // Exclude all tests if annotations are not supported or no beanProvider has been set
            return beanProvider == null;
        }
    };

    /**
     * Loads a specified bean by type, used to retrieve an annotated bean to test from the
     * underlying implementation
     * 
     * @param beanClass
     *            The type to load
     * @return The loaded bean
     */
    protected final <T> T getBeanByType(Class<T> beanClass)
    {
        if (beanProvider == null) { throw new IllegalStateException(
                "No tests should be run if beanProvider is null"); }

        return beanProvider.getBeanByType(beanClass);
    }
}