ContentBuilder.java revision 3233:b5d08bc0d224 
1/*
2 * Copyright (c) 2003, 2015, 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
26package jdk.javadoc.internal.doclets.formats.html.markup;
27
28import java.io.IOException;
29import java.io.Writer;
30import java.util.ArrayList;
31import java.util.Collections;
32import java.util.List;
33
34import jdk.javadoc.internal.doclets.toolkit.Content;
35
36/**
37 * A sequence of Content nodes.
38 */
39public class ContentBuilder extends Content {
40    protected List<Content> contents = Collections.<Content>emptyList();
41
42    @Override
43    public void addContent(Content content) {
44        nullCheck(content);
45        ensureMutableContents();
46        if (content instanceof ContentBuilder) {
47            contents.addAll(((ContentBuilder) content).contents);
48        } else
49            contents.add(content);
50    }
51
52    @Override
53    public void addContent(String text) {
54        if (text.isEmpty())
55            return;
56        ensureMutableContents();
57        Content c = contents.isEmpty() ? null : contents.get(contents.size() - 1);
58        StringContent sc;
59        if (c != null && c instanceof StringContent) {
60            sc = (StringContent) c;
61        } else {
62            contents.add(sc = new StringContent());
63        }
64        sc.addContent(text);
65    }
66
67    @Override
68    public boolean write(Writer writer, boolean atNewline) throws IOException {
69        for (Content content: contents) {
70            atNewline = content.write(writer, atNewline);
71        }
72        return atNewline;
73    }
74
75    @Override
76    public boolean isEmpty() {
77        for (Content content: contents) {
78            if (!content.isEmpty())
79                return false;
80        }
81        return true;
82    }
83
84    @Override
85    public int charCount() {
86        int n = 0;
87        for (Content c : contents)
88            n += c.charCount();
89        return n;
90    }
91
92    private void ensureMutableContents() {
93        if (contents.isEmpty())
94            contents = new ArrayList<>();
95    }
96}
97