| /* |
| * Copyright 2014 Niclas Hedhman. |
| * Copyright 2014 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.apache.zest.bootstrap.builder; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import org.apache.zest.bootstrap.Assembler; |
| import org.apache.zest.bootstrap.AssemblyException; |
| import org.apache.zest.bootstrap.LayerAssembly; |
| import org.apache.zest.bootstrap.ModuleAssembly; |
| |
| import static org.apache.zest.api.util.Classes.isAssignableFrom; |
| import static org.apache.zest.functional.Iterables.filter; |
| import static org.apache.zest.functional.Iterables.toList; |
| import static org.apache.zest.functional.Specifications.not; |
| |
| /** |
| * Provides declared {@link org.apache.zest.api.structure.Module} information that the {@link ApplicationBuilder} can use. |
| */ |
| public class ModuleDeclaration |
| { |
| private final String moduleName; |
| private final List<Assembler> assemblers = new ArrayList<>(); |
| private ModuleAssembly module; |
| |
| public ModuleDeclaration( String moduleName ) |
| { |
| this.moduleName = moduleName; |
| } |
| |
| /** |
| * Declare Assembler. |
| * @param assembler Assembler instance |
| * @return This Module declaration |
| */ |
| public ModuleDeclaration withAssembler( Assembler assembler ) |
| { |
| assemblers.add( assembler ); |
| return this; |
| } |
| |
| /** |
| * Declare Assembler. |
| * @param classname Assembler class name |
| * @return This Module declaration |
| * @throws AssemblyException if unable to load class, not an Assembler or unable to instanciate |
| */ |
| public ModuleDeclaration withAssembler( String classname ) |
| throws AssemblyException |
| { |
| Class<? extends Assembler> clazz = loadClass( classname ); |
| return withAssembler( clazz ); |
| } |
| |
| /** |
| * Declare Assembler. |
| * @param assemblerClass Assembler class |
| * @return This Module declaration |
| * @throws AssemblyException not an Assembler or if unable to instanciate |
| */ |
| public ModuleDeclaration withAssembler( Class<?> assemblerClass ) |
| throws AssemblyException |
| { |
| Assembler assembler = createAssemblerInstance( assemblerClass ); |
| assemblers.add( assembler ); |
| return this; |
| } |
| |
| /** |
| * Declare Assemblers. |
| * <p>Declare several Assemblers from an Iterable of Class objects.</p> |
| * <p>Typically used along {@link org.apache.zest.bootstrap.ClassScanner}.</p> |
| * @param assemblerClasses Assembler classes |
| * @return This Module declaration |
| * @throws AssemblyException if one of the Class is not an Assembler or unable to instanciate |
| */ |
| public ModuleDeclaration withAssemblers( Iterable<Class<?>> assemblerClasses ) |
| throws AssemblyException |
| { |
| List<Class<?>> notAssemblers = toList( |
| filter( not( isAssignableFrom( Assembler.class ) ), |
| assemblerClasses ) |
| ); |
| if( !notAssemblers.isEmpty() ) |
| { |
| throw new AssemblyException( |
| "Classes " + notAssemblers + " are not implementing " + Assembler.class.getName() |
| ); |
| } |
| for( Class<?> assemblerClass : assemblerClasses ) |
| { |
| withAssembler( assemblerClass ); |
| } |
| return this; |
| } |
| |
| ModuleAssembly createModule( LayerAssembly layer ) |
| { |
| module = layer.module( moduleName ); |
| return module; |
| } |
| |
| void initialize() |
| throws AssemblyException |
| { |
| for( Assembler assembler : assemblers ) |
| { |
| assembler.assemble( module ); |
| } |
| } |
| |
| @SuppressWarnings( "unchecked" ) |
| private Class<? extends Assembler> loadClass( String classname ) |
| throws AssemblyException |
| { |
| Class<?> clazz; |
| try |
| { |
| clazz = getClass().getClassLoader().loadClass( classname ); |
| } |
| catch( Exception e ) |
| { |
| throw new AssemblyException( "Unable to load class " + classname, e ); |
| } |
| if( !Assembler.class.isAssignableFrom( clazz ) ) |
| { |
| throw new AssemblyException( |
| "Class " + classname + " is not implementing " + Assembler.class.getName() |
| ); |
| } |
| //noinspection unchecked |
| return (Class<? extends Assembler>) clazz; |
| } |
| |
| private Assembler createAssemblerInstance( Class<?> assemblerClass ) |
| throws AssemblyException |
| { |
| if( !Assembler.class.isAssignableFrom( assemblerClass ) ) |
| { |
| throw new AssemblyException( |
| "Class " + assemblerClass + " is not implementing " + Assembler.class.getName() |
| ); |
| } |
| try |
| { |
| return (Assembler) assemblerClass.newInstance(); |
| } |
| catch( Exception e ) |
| { |
| throw new AssemblyException( "Unable to instantiate " + assemblerClass, e ); |
| } |
| } |
| } |