1 /*
2 * Copyright (C) 2014 Atlassian
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package com.atlassian.jira.rest.client.api.domain;
18
19 import com.google.common.base.Optional;
20
21 import javax.annotation.Nullable;
22
23 public interface Operation {
24 /**
25 * @return Operation id. May be null.
26 */
27 @Nullable String getId();
28
29 /**
30 * Traverse through operation elements to visit them. Traversal will stop on first non absent value
31 * returned from the visitor.
32 *
33 * @param visitor Visitor to visit operation element
34 * @param <T> Visiting result type
35 * @return Value returned from the visitor.
36 */
37 <T> Optional<T> accept(OperationVisitor<T> visitor);
38
39 }