# MockPlayerMixin.java

    /*
     * Copyright 2008 Alin Dreghiciu.
     *
     * 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.qi4j.test.mock;

    import java.lang.reflect.InvocationHandler;
    import java.lang.reflect.Method;
    import org.qi4j.api.injection.scope.This;
    import org.qi4j.test.mock.internal.MockRepository;
    import org.qi4j.test.mock.internal.MockResolver;

    /**
     * Generic mixin for mock composites. Overrides any generic mixins but not typed mixins, as typed mixins have precedence
     * over generic mixins. To override a typed mixin {@link org.qi4j.test.mock.MockPlayerConcern} can be used.
     * MockResolver player mixin will delegate method invocations to registered mocks. Mocks can be registered by using
     * {@link org.qi4j.test.mock.MockComposite}.
     * If there is no mock registered to handle the method invocation invocation will fail by throwing an
     * IllegalStateException.
     */
    public class MockPlayerMixin
        implements InvocationHandler
    {

        /**
         * MockResolver repository. Holds all registred mocks.
         */
        @This
        MockRepository mockRepository;

        /**
         * Finds a registered mock that can handle the method invocation and delegate to it. If there is no such mock throws
         * IllegalStateException.
         *
         * @see java.lang.reflect.InvocationHandler#invoke(Object, java.lang.reflect.Method, Object[])
         */
        @Override
        public Object invoke( final Object proxy, final Method method, final Object[] args )
            throws Throwable
        {
            System.out.println( "Play mock for " + method );
            for( MockResolver mockResolver : mockRepository.getAll() )
            {
                InvocationHandler handler = mockResolver.getInvocationHandler( proxy, method, args );
                if( handler != null )
                {
                    return handler.invoke( mockResolver, method, args );
                }
            }
            throw new IllegalStateException( "There is no mock registered that can handle " + method );
        }
    }