# HasUoWFile.java

    /*
     * Copyright 2011 Paul Merlin.
     *
     * 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.library.uowfile.singular;

    import java.io.File;
    import org.qi4j.api.injection.scope.Service;
    import org.qi4j.api.injection.scope.This;
    import org.qi4j.api.mixin.Mixins;
    import org.qi4j.api.unitofwork.UnitOfWork;
    import org.qi4j.library.uowfile.internal.UoWFileFactory;

    @Mixins( HasUoWFile.Mixin.class )
    // START SNIPPET: contract
    public interface HasUoWFile
    {
        /**
         * IMPORTANT Use this {@link File} inside read-only {@link UnitOfWork}s only
         * @return The file that is attached.
         */
        File attachedFile();

        File managedFile();
        // END SNIPPET: contract

        class Mixin
            implements HasUoWFile
        {
            @Service
            private UoWFileFactory uowFileFactory;

            @This
            private UoWFileLocator locator;

            @Override
            public File attachedFile()
            {
                return locator.locateAttachedFile();
            }

            @Override
            public File managedFile()
            {
                return uowFileFactory.createCurrentUoWFile( locator.locateAttachedFile() ).asFile();
            }
        }
        // START SNIPPET: contract

    }
    // END SNIPPET: contract