/**
* Copyright (C) 2007 Logan Johnson
*
* 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 atunit.guice;
import java.lang.reflect.Field;
import java.lang.reflect.Type;
import java.util.Collection;
import java.util.Map;
import com.google.common.collect.Iterables;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;
import com.google.inject.AbstractModule;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Module;
import com.google.inject.TypeLiteral;
import atunit.core.Container;
public class GuiceContainer implements Container {
public Object createTest(Class<?> testClass, Map<Field, Object> fieldValues) throws Exception {
FieldModule fields = new FieldModule(fieldValues);
Injector injector;
if ( Module.class.isAssignableFrom(testClass)) {
injector = Guice.createInjector(fields, (Module)testClass.newInstance() );
} else {
injector = Guice.createInjector(fields);
}
return injector.getInstance(testClass);
}
protected class FieldModule extends AbstractModule {
final Map<Field,Object> fields;
public FieldModule(Map<Field,Object> fields) {
this.fields = fields;
}
@Override
@SuppressWarnings("unchecked")
protected void configure() {
// map field values by type
Multimap<Type, Field> fieldsByType = Multimaps.newHashMultimap();
for ( Field field : fields.keySet() ) {
fieldsByType.put(field.getGenericType(), field);
}
// for any types that don't have duplicates, bind instances.
for ( Type type : fieldsByType.keySet() ) {
Collection<Field> fields = fieldsByType.get(type);
if ( fields.size() == 1 ) {
Field field = Iterables.getOnlyElement(fields);
TypeLiteral literal = TypeLiteral.get(type);
bind(literal).toInstance(this.fields.get(field));
}
}
}
}
}