/*
* Copyright 2009 Google Inc.
*
* 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.google.jstestdriver.guice;
import com.google.inject.Binder;
import com.google.inject.Key;
import com.google.inject.name.Named;
import com.google.inject.name.Names;
import com.google.inject.util.Providers;
import com.google.inject.util.Types;
import com.google.jstestdriver.Flags;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
/**
* Reads and binds the Flags data to a Guice scope.
* @author corysmith
*
*/
public class FlagBinder {
private final Flags flags;
public FlagBinder(Flags flags) {
this.flags = flags;
}
@SuppressWarnings("unchecked")
public void bind(Binder binder) {
// TODO(corysmith): figure out how to read annotations off the interface from an instance class.
for (Method method : Flags.class.getMethods()) {
GuiceBinding annotation = method.getAnnotation(GuiceBinding.class);
if (annotation == null) {
continue;
}
Object value;
try {
value = method.invoke(flags);
binder.bind(resolveClass(annotation,
method.getReturnType())).toProvider(Providers.of(value));
} catch (IllegalArgumentException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
}
}
@SuppressWarnings("unchecked")
private Key resolveClass(GuiceBinding annotation, Class returnType) {
Named named = Names.named(annotation.name());
if (List.class.isAssignableFrom(returnType)) {
if (annotation.parameterizedType() == GuiceBinding.NullClass.class) {
throw new IllegalArgumentException("Missing parameterized type for " + annotation);
}
return Key.get(Types.listOf(annotation.parameterizedType()), named);
}
return Key.get(returnType, named);
}
}