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1   /*
2    * Copyright (c) 2003, 2013, 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 com.sun.tools.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  import com.sun.tools.doclets.internal.toolkit.Content;
34  
35  /**
36   * A sequence of Content nodes.
37   */
38  public class ContentBuilder extends Content {
39      protected List<Content> contents = Collections.<Content>emptyList();
40  
41      @Override
42      public void addContent(Content content) {
43          nullCheck(content);
44          ensureMutableContents();
45          if (content instanceof ContentBuilder) {
46              contents.addAll(((ContentBuilder) content).contents);
47          } else
48              contents.add(content);
49      }
50  
51      @Override
52      public void addContent(String text) {
53          if (text.isEmpty())
54              return;
55          ensureMutableContents();
56          Content c = contents.isEmpty() ? null : contents.get(contents.size() - 1);
57          StringContent sc;
58          if (c != null && c instanceof StringContent) {
59              sc = (StringContent) c;
60          } else {
61              contents.add(sc = new StringContent());
62          }
63          sc.addContent(text);
64      }
65  
66      @Override
67      public boolean write(Writer writer, boolean atNewline) throws IOException {
68          for (Content content: contents) {
69              atNewline = content.write(writer, atNewline);
70          }
71          return atNewline;
72      }
73  
74      @Override
75      public boolean isEmpty() {
76          for (Content content: contents) {
77              if (!content.isEmpty())
78                  return false;
79          }
80          return true;
81      }
82  
83      @Override
84      public int charCount() {
85          int n = 0;
86          for (Content c : contents)
87              n += c.charCount();
88          return n;
89      }
90  
91      private void ensureMutableContents() {
92          if (contents.isEmpty())
93              contents = new ArrayList<Content>();
94      }
95  }