# HasUoWFiles.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.plural;

    import java.io.File;
    import java.util.ArrayList;
    import java.util.List;
    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( HasUoWFiles.Mixin.class )
    // START SNIPPET: contract
    public interface HasUoWFiles<T extends Enum<T>>
    {
        /**
         * IMPORTANT Use this {@link File} only inside read-only {@link UnitOfWork}s
         */
        File attachedFile( T key );

        /**
         * IMPORTANT Use these {@link File}s only inside read-only {@link UnitOfWork}s
         */
        Iterable<File> attachedFiles();

        File managedFile( T key );

        Iterable<File> managedFiles();
        // END SNIPPET: contract

        abstract class Mixin<R extends Enum<R>>
            implements HasUoWFiles<R>
        {
            @Service
            private UoWFileFactory uowFileFactory;
            @This
            private UoWFilesLocator<R> locator;

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

            @Override
            public Iterable<File> attachedFiles()
            {
                return locator.locateAttachedFiles();
            }

            @Override
            public File managedFile( R key )
            {
                return uowFileFactory.createCurrentUoWFile( locator.locateAttachedFile( key ) ).asFile();
            }

            @Override
            public Iterable<File> managedFiles()
            {
                List<File> managedFiles = new ArrayList<>();
                for( File eachAttachedFile : locator.locateAttachedFiles() )
                {
                    managedFiles.add( uowFileFactory.createCurrentUoWFile( eachAttachedFile ).asFile() );
                }
                return managedFiles;
            }
        }

        // START SNIPPET: contract
    }
    // END SNIPPET: contract