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/*
* Copyright (C) 2008 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.inject.spi;
import com.google.inject.Scope;
import java.lang.annotation.Annotation;
/**
* Visits each of the strategies used to scope an injection.
*
* @param <V> any type to be returned by the visit method. Use {@link Void} with {@code return null}
* if no return type is needed.
* @since 2.0
*/
public interface BindingScopingVisitor<V> {
/**
* Visit an eager singleton or single instance. This scope strategy is found on both module and
* injector bindings.
*/
V visitEagerSingleton();
/** Visit a scope instance. This scope strategy is found on both module and injector bindings. */
V visitScope(Scope scope);
/**
* Visit a scope annotation. This scope strategy is found only on module bindings. The instance
* that implements this scope is registered by {@link com.google.inject.Binder#bindScope(Class,
* Scope) Binder.bindScope()}.
*/
V visitScopeAnnotation(Class<? extends Annotation> scopeAnnotation);
/**
* Visit an unspecified or unscoped strategy. On a module, this strategy indicates that the
* injector should use scoping annotations to find a scope. On an injector, it indicates that no
* scope is applied to the binding. An unscoped binding will behave like a scoped one when it is
* linked to a scoped binding.
*/
V visitNoScoping();
}
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