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Java > Open Source Codes > com > lowagie > text > pdf > FontSelector


1 /*
2  * Copyright 2003 by Paulo Soares.
3  *
4  * The contents of this file are subject to the Mozilla Public License Version 1.1
5  * (the "License"); you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at http://www.mozilla.org/MPL/
7  *
8  * Software distributed under the License is distributed on an "AS IS" basis,
9  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
10  * for the specific language governing rights and limitations under the License.
11  *
12  * The Original Code is 'iText, a free JAVA-PDF library'.
13  *
14  * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
15  * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
16  * All Rights Reserved.
17  * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
18  * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
19  *
20  * Contributor(s): all the names of the contributors are added in the source code
21  * where applicable.
22  *
23  * Alternatively, the contents of this file may be used under the terms of the
24  * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
25  * provisions of LGPL are applicable instead of those above. If you wish to
26  * allow use of your version of this file only under the terms of the LGPL
27  * License and not to allow others to use your version of this file under
28  * the MPL, indicate your decision by deleting the provisions above and
29  * replace them with the notice and other provisions required by the LGPL.
30  * If you do not delete the provisions above, a recipient may use your version
31  * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
32  *
33  * This library is free software; you can redistribute it and/or modify it
34  * under the terms of the MPL as stated above or under the terms of the GNU
35  * Library General Public License as published by the Free Software Foundation;
36  * either version 2 of the License, or any later version.
37  *
38  * This library is distributed in the hope that it will be useful, but WITHOUT
39  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
40  * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
41  * details.
42  *
43  * If you didn't download this code from the following link, you should check if
44  * you aren't using an obsolete version:
45  * http://www.lowagie.com/iText/
46  */
47 package com.lowagie.text.pdf;
48
49 import java.util.ArrayList JavaDoc;
50
51 import com.lowagie.text.Chunk;
52 import com.lowagie.text.Font;
53 import com.lowagie.text.Phrase;
54
55 /** Selects the appropriate fonts that contain the glyphs needed to
56  * render text correctly. The fonts are checked in order until the
57  * character is found.
58  * <p>
59  * The built in fonts "Symbol" and "ZapfDingbats", if used, have a special encoding
60  * to allow the characters to be referred by Unicode.
61  * @author Paulo Soares (psoares@consiste.pt)
62  */
63 public class FontSelector {
64     
65     protected ArrayList JavaDoc fonts = new ArrayList JavaDoc();
66
67     /**
68      * Adds a <CODE>Font</CODE> to be searched for valid characters.
69      * @param font the <CODE>Font</CODE>
70      */
71     public void addFont(Font font) {
72         if (font.getBaseFont() != null) {
73             fonts.add(font);
74             return;
75         }
76         BaseFont bf = font.getCalculatedBaseFont(true);
77         Font f2 = new Font(bf, font.getSize(), font.getCalculatedStyle(), font.getColor());
78         fonts.add(f2);
79     }
80     
81     /**
82      * Process the text so that it will render with a combination of fonts
83      * if needed.
84      * @param text the text
85      * @return a <CODE>Phrase</CODE> with one or more chunks
86      */
87     public Phrase process(String JavaDoc text) {
88         int fsize = fonts.size();
89         if (fsize == 0)
90             throw new IndexOutOfBoundsException JavaDoc("No font is defined.");
91         char cc[] = text.toCharArray();
92         int len = cc.length;
93         StringBuffer JavaDoc sb = new StringBuffer JavaDoc();
94         Font font = null;
95         int lastidx = -1;
96         Phrase ret = new Phrase();
97         for (int k = 0; k < len; ++k) {
98             char c = cc[k];
99             if (c == '\n' || c == '\r') {
100                 sb.append(c);
101                 continue;
102             }
103             for (int f = 0; f < fsize; ++f) {
104                 font = (Font)fonts.get(f);
105                 if (font.getBaseFont().charExists(c)) {
106                     if (lastidx == f)
107                         sb.append(c);
108                     else {
109                         if (sb.length() > 0 && lastidx != -1) {
110                             Chunk ck = new Chunk(sb.toString(), (Font)fonts.get(lastidx));
111                             ret.add(ck);
112                             sb.setLength(0);
113                         }
114                         sb.append(c);
115                         lastidx = f;
116                     }
117                     break;
118                 }
119             }
120         }
121         if (sb.length() > 0) {
122             Chunk ck = new Chunk(sb.toString(), (Font)fonts.get(lastidx == -1 ? 0 : lastidx));
123             ret.add(ck);
124         }
125         return ret;
126     }
127 }
128
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