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 /**
22 * Interface visit operation elements
23 *
24 * @see Operations#accept(OperationVisitor)
25 * @see Operation#accept(OperationVisitor)
26 * @since 2.0
27 */
28 public interface OperationVisitor<T> {
29 /**
30 * Visits operation element
31 *
32 * @param operation operation element to be visited
33 * @return Present value means "I've found a value let's finish visiting".
34 * If absent traversal through operation elements will be continued.
35 */
36 Optional<T> visit(Operation operation);
37 }