/mycila-testing/tags/mycila-testing-1.0-rc1/mycila-testing-plugins/mycila-testing-guice/src/main/java/com/mycila/testing/plugin/guice/Guice1TestPlugin.java

/**

 * Copyright (C) 2008 Mathieu Carbou <mathieu.carbou@gmail.com>

 *

 * 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 com.mycila.testing.plugin.guice;



import com.google.inject.*;

import com.google.inject.binder.AnnotatedBindingBuilder;

import com.google.inject.binder.LinkedBindingBuilder;

import com.google.inject.binder.ScopedBindingBuilder;

import com.mycila.testing.core.AbstractTestPlugin;

import com.mycila.testing.core.Context;

import com.mycila.testing.core.TestPluginException;



import java.lang.reflect.Field;

import java.lang.reflect.Method;

import java.lang.reflect.Type;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;



/**

 * @author Mathieu Carbou (mathieu.carbou@gmail.com)

 */

public final class Guice1TestPlugin extends AbstractTestPlugin {



    public void prepareTestInstance(Context context) {

        GuiceContext ctx = context.getTest().getTargetClass().getAnnotation(GuiceContext.class);

        List<Module> modules = new ArrayList<Module>();

        modules.addAll(contextualModules(ctx));

        modules.addAll(providedModules(context));

        modules.add(bindings(context));

        modules.add(providedBindings(context));

        if (context.getTest().getTarget() instanceof Module) {

            modules.add((Module) context.getTest().getTarget());

        }

        Injector injector = Guice.createInjector(findStage(ctx), modules);

        context.setAttribute("com.google.inject.Injector", injector);

        injector.injectMembers(context.getTest().getTarget());

    }



    private Module bindings(final Context context) {

        return new Module() {

            public void configure(Binder binder) {

                for (final Field field : context.getTest().getFieldsAnnotatedWith(Bind.class)) {

                    Guice1TestPlugin.this.configure(binder, field.getGenericType(), field.getAnnotation(Bind.class), new Provider<Object>() {

                        public Object get() {

                            return context.getTest().get(field);

                        }

                    });



                }

            }

        };

    }



    private Module providedBindings(final Context context) {

        return new Module() {

            public void configure(Binder binder) {

                for (final Method method : context.getTest().getMethodsAnnotatedWith(Bind.class)) {

                    Guice1TestPlugin.this.configure(binder, method.getGenericReturnType(), method.getAnnotation(Bind.class), new Provider<Object>() {

                        public Object get() {

                            return context.getTest().invoke(method);

                        }

                    });



                }

            }

        };

    }



    @SuppressWarnings({"unchecked"})

    private <T> void configure(Binder binder, Type type, Bind annotation, Provider<T> provider) {

        AnnotatedBindingBuilder<T> builder1 = (AnnotatedBindingBuilder<T>) binder.bind(TypeLiteral.get(type));

        LinkedBindingBuilder<T> builder2 = annotation.annotatedBy().equals(NoAnnotation.class) ? builder1 : builder1.annotatedWith(annotation.annotatedBy());

        ScopedBindingBuilder builder3 = builder2.toProvider(provider);

        if (!annotation.scope().equals(NoAnnotation.class)) {

            builder3.in(annotation.scope());

        }

    }



    private List<Module> providedModules(Context ctx) {

        List<Module> modules = new ArrayList<Module>();

        for (Method method : ctx.getTest().getMethodsOfTypeAnnotatedWith(Module.class, ModuleProvider.class)) {

            modules.add((Module) ctx.getTest().invoke(method));

        }

        for (Method method : ctx.getTest().getMethodsOfTypeAnnotatedWith(Module[].class, ModuleProvider.class)) {

            modules.addAll(Arrays.asList((Module[]) ctx.getTest().invoke(method)));

        }

        for (Method method : ctx.getTest().getMethodsOfTypeAnnotatedWith(Iterable.class, ModuleProvider.class)) {

            //noinspection unchecked

            for (Module module : (Iterable<Module>) ctx.getTest().invoke(method)) {

                modules.add(module);

            }

        }

        return modules;

    }



    private Stage findStage(GuiceContext ctx) {

        return ctx == null ? Stage.DEVELOPMENT : ctx.stage();

    }



    private List<Module> contextualModules(GuiceContext context) {

        List<Module> modules = new ArrayList<Module>();

        if (context != null) {

            for (Class<? extends Module> moduleClass : context.value()) {

                try {

                    modules.add(moduleClass.newInstance());

                } catch (Exception e) {

                    throw new TestPluginException(e, "Error instanciating module class '%s': %s", moduleClass.getName(), e.getMessage());

                }

            }

        }

        return modules;

    }

}