com.google.inject.spi.BindingScopingVisitor Maven / Gradle / Ivy

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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  any type to be returned by the visit method. Use {@link Void} with
 *            {@code return null} if no return type is needed.
 */
public interface BindingScopingVisitor {

    /**
     * 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 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();
}