# AssemblerCollection.java

    /*
     * Copyright (c) 2007, Rickard Öberg. All Rights Reserved.
     *
     * 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.bootstrap;

    import java.util.ArrayList;
    import java.util.Arrays;
    import java.util.Collection;

    /**
     * Assembler that delegates to a collection of Assemblers.
     * <p>
     * Makes it easy to collect and compose assemblers into bigger assemblers.
     * </p>
     */
    public final class AssemblerCollection
        implements Assembler
    {
        Collection<Assembler> assemblers;

        public AssemblerCollection( Assembler... assemblers )
        {
            this.assemblers = Arrays.asList( assemblers );
        }

        @SafeVarargs
        public AssemblerCollection( Class<? extends Assembler>... assemblyClasses )
            throws AssemblyException
        {
            assemblers = new ArrayList<>();
            for( Class<? extends Assembler> assemblyClass : assemblyClasses )
            {
                try
                {
                    Assembler assembler = assemblyClass.newInstance();
                    assemblers.add( assembler );
                }
                catch( Exception e )
                {
                    throw new AssemblyException( "Could not instantiate assembly with class " + assemblyClass.getName(), e );
                }
            }
        }

        public AssemblerCollection( Collection<Assembler> assemblers )
        {
            this.assemblers = assemblers;
        }

        @Override
        public void assemble( ModuleAssembly module )
            throws AssemblyException
        {
            for( Assembler assembler : assemblers )
            {
                assembler.assemble( module );
            }
        }
    }