35 lines
1.0 KiB
Java
35 lines
1.0 KiB
Java
/*
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* Copyright 2012 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.hateoas;
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import java.io.Serializable;
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import java.util.Optional;
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/**
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* Interface to mark objects that are identifiable by an ID of any type.
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*
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* @author Oliver Gierke
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*/
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public interface Identifiable<ID extends Serializable> {
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/**
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* Returns the id identifying the object.
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*
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* @return the identifier or {@link Optional#empty()} if not available.
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*/
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Optional<ID> getId();
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}
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