1 /*
2  * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.  Oracle designates this
8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22  * or visit www.oracle.com if you need additional information or have any
23  * questions.
24  */
25 
26 package jdk.javadoc.internal.doclets.formats.html.markup;
27 
28 import java.io.IOException;
29 import java.io.Writer;
30 import java.util.ArrayList;
31 import java.util.Collections;
32 import java.util.List;
33 
34 import jdk.javadoc.internal.doclets.toolkit.Content;
35 
36 /**
37  * A sequence of Content nodes.
38  */
39 public class ContentBuilder extends Content {
40     protected List<Content> contents = Collections.emptyList();
41 
ContentBuilder()42     public ContentBuilder() { }
43 
ContentBuilder(Content... contents)44     public ContentBuilder(Content... contents) {
45         for (Content c : contents) {
46             addContent(c);
47         }
48     }
49 
50     @Override
addContent(Content content)51     public void addContent(Content content) {
52         nullCheck(content);
53         ensureMutableContents();
54         if (content instanceof ContentBuilder) {
55             contents.addAll(((ContentBuilder) content).contents);
56         } else
57             contents.add(content);
58     }
59 
60     @Override
addContent(CharSequence text)61     public void addContent(CharSequence text) {
62         if (text.length() == 0)
63             return;
64         ensureMutableContents();
65         Content c = contents.isEmpty() ? null : contents.get(contents.size() - 1);
66         StringContent sc;
67         if (c != null && c instanceof StringContent) {
68             sc = (StringContent) c;
69         } else {
70             contents.add(sc = new StringContent());
71         }
72         sc.addContent(text);
73     }
74 
75     @Override
write(Writer writer, boolean atNewline)76     public boolean write(Writer writer, boolean atNewline) throws IOException {
77         for (Content content: contents) {
78             atNewline = content.write(writer, atNewline);
79         }
80         return atNewline;
81     }
82 
83     @Override
isEmpty()84     public boolean isEmpty() {
85         for (Content content: contents) {
86             if (!content.isEmpty())
87                 return false;
88         }
89         return true;
90     }
91 
92     @Override
charCount()93     public int charCount() {
94         int n = 0;
95         for (Content c : contents)
96             n += c.charCount();
97         return n;
98     }
99 
ensureMutableContents()100     private void ensureMutableContents() {
101         if (contents.isEmpty())
102             contents = new ArrayList<>();
103     }
104 }
105