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Mockito mock objects library core API and implementation

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/*
 * Copyright (c) 2019 Mockito contributors
 * This program is made available under the terms of the MIT License.
 */
package org.mockito.plugins;

/**
 * Enforcer that is applied to every type in the type hierarchy of the class-to-be-mocked.
 */
public interface DoNotMockEnforcer {

    /**
     * If this type is allowed to be mocked. Return an empty optional if the enforcer allows
     * this type to be mocked. Return a message if there is a reason this type can not be mocked.
     *
     * Note that Mockito performs traversal of the type hierarchy. Implementations of this class
     * should therefore not perform type traversal themselves but rely on Mockito.
     *
     * @param type The type to check
     * @return Optional message if this type can not be mocked, or an empty optional if type can be mocked
     */
    String checkTypeForDoNotMockViolation(Class type);
}