/**
* Copyright (C) 2011 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.gimlet.inject.introspectingscoper.defaults;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.gimlet.inject.introspectingscoper.CaptureInScopeConstants.DEFAULT_ANNOTATION_VALUE;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.gimlet.inject.introspectingscoper.CaptureInScope;
import com.google.gimlet.inject.introspectingscoper.IntrospectingScoper;
import com.google.gimlet.inject.nestedscope.NestedScope;
import com.google.gimlet.reflect.AnnotatedMethodExtractor;
import com.google.gimlet.reflect.MethodInvoker;
import com.google.inject.Inject;
import com.google.inject.Key;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.Map.Entry;
/**
* Provides a default implementation of {@link IntrospectingScoper}.
*
* @author ffaber@gmail.com (Fred Faber)
*/
class DefaultIntrospectingScoper implements IntrospectingScoper {
private final AnnotatedMethodExtractor annotatedMethodExtractor;
private final MethodInvoker methodInvoker;
private final NestedScope nestedScope;
@Inject DefaultIntrospectingScoper(
AnnotatedMethodExtractor annotatedMethodExtractor,
MethodInvoker methodInvoker,
NestedScope nestedScope) {
this.annotatedMethodExtractor = annotatedMethodExtractor;
this.methodInvoker = methodInvoker;
this.nestedScope = nestedScope;
}
@Override @SuppressWarnings("unchecked")
public void scopeIntrospectively(Object target) {
checkNotNull(target);
ImmutableList<Method> annotatedMethods =
annotatedMethodExtractor.extractAllAnnotatedMethods(
target.getClass(), CaptureInScope.class);
Map<Method, Object> invocationResults =
methodInvoker.invokeMethods(annotatedMethods, target);
for (Entry<Method, Object> entry : invocationResults.entrySet()) {
Method method = entry.getKey();
Object result = entry.getValue();
CaptureInScope annotation;
annotation = Preconditions
.checkNotNull(method.getAnnotation(CaptureInScope.class));
Class<? extends Annotation> bindingAnnotation = annotation.value();
// The construction of the key will fail if the annotation is not an
// instance of BindingAnnotation. We could do a Preconditions check here,
// but it'd be simply redundant.
Key key = bindingAnnotation == DEFAULT_ANNOTATION_VALUE ?
Key.get(method.getGenericReturnType()) :
Key.get(method.getGenericReturnType(), bindingAnnotation);
nestedScope.put(key, result);
}
}
}