1 /*
2 * Copyright 2012-2025 Christophe Friederich
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 package org.devacfr.maven.skins.reflow.snippet;
17
18 import java.util.ArrayList;
19 import org.jsoup.internal.StringUtil;
20
21 /**
22 * @author Christophe Friederich
23 * @version 2.4
24 */
25 public class Components extends ArrayList<Component<?>> {
26
27 /**
28 * @see java.io.Serializable
29 */
30 private static final long serialVersionUID = 1L;
31
32 /**
33 * @see Components#empty()
34 */
35 private static final Components EMPTY = new Components();
36
37 /**
38 * @return an empty Components instance
39 */
40 public static Components empty() {
41 return EMPTY;
42 }
43
44 /**
45 * Default constructor.
46 */
47 public Components() {
48 }
49
50 /**
51 * @return the HTML representation of all components
52 */
53 public String html() {
54 final StringBuilder sb = StringUtil.borrowBuilder();
55 for (final Component<?> component : this) {
56 if (sb.length() != 0) {
57 sb.append("\n");
58 }
59 final String html = component.getHtml();
60 if (html != null) {
61 sb.append(html);
62 }
63 }
64 return StringUtil.releaseBuilder(sb);
65 }
66
67 /**
68 * Get the first matched element.
69 *
70 * @return The first matched component, or <code>null</code> if contents is empty.
71 */
72 public Component<?> first() {
73 return isEmpty() ? null : get(0);
74 }
75
76 /**
77 * Get the last matched component.
78 *
79 * @return The last matched component, or <code>null</code> if contents is empty.
80 */
81 public Component<?> last() {
82 return isEmpty() ? null : get(size() - 1);
83 }
84 }