001/* 002 * $Id: FontSelector.java 4784 2011-03-15 08:33:00Z blowagie $ 003 * 004 * This file is part of the iText (R) project. 005 * Copyright (c) 1998-2011 1T3XT BVBA 006 * Authors: Bruno Lowagie, Paulo Soares, et al. 007 * 008 * This program is free software; you can redistribute it and/or modify 009 * it under the terms of the GNU Affero General Public License version 3 010 * as published by the Free Software Foundation with the addition of the 011 * following permission added to Section 15 as permitted in Section 7(a): 012 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT, 013 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS. 014 * 015 * This program is distributed in the hope that it will be useful, but 016 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 017 * or FITNESS FOR A PARTICULAR PURPOSE. 018 * See the GNU Affero General Public License for more details. 019 * You should have received a copy of the GNU Affero General Public License 020 * along with this program; if not, see http://www.gnu.org/licenses or write to 021 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 022 * Boston, MA, 02110-1301 USA, or download the license from the following URL: 023 * http://itextpdf.com/terms-of-use/ 024 * 025 * The interactive user interfaces in modified source and object code versions 026 * of this program must display Appropriate Legal Notices, as required under 027 * Section 5 of the GNU Affero General Public License. 028 * 029 * In accordance with Section 7(b) of the GNU Affero General Public License, 030 * a covered work must retain the producer line in every PDF that is created 031 * or manipulated using iText. 032 * 033 * You can be released from the requirements of the license by purchasing 034 * a commercial license. Buying such a license is mandatory as soon as you 035 * develop commercial activities involving the iText software without 036 * disclosing the source code of your own applications. 037 * These activities include: offering paid services to customers as an ASP, 038 * serving PDFs on the fly in a web application, shipping iText with a closed 039 * source product. 040 * 041 * For more information, please contact iText Software Corp. at this 042 * address: sales@itextpdf.com 043 */ 044package com.itextpdf.text.pdf; 045 046import java.util.ArrayList; 047 048import com.itextpdf.text.Chunk; 049import com.itextpdf.text.Font; 050import com.itextpdf.text.Phrase; 051import com.itextpdf.text.Utilities; 052import com.itextpdf.text.error_messages.MessageLocalization; 053 054/** Selects the appropriate fonts that contain the glyphs needed to 055 * render text correctly. The fonts are checked in order until the 056 * character is found. 057 * <p> 058 * The built in fonts "Symbol" and "ZapfDingbats", if used, have a special encoding 059 * to allow the characters to be referred by Unicode. 060 * @author Paulo Soares 061 */ 062public class FontSelector { 063 064 protected ArrayList<Font> fonts = new ArrayList<Font>(); 065 066 /** 067 * Adds a <CODE>Font</CODE> to be searched for valid characters. 068 * @param font the <CODE>Font</CODE> 069 */ 070 public void addFont(Font font) { 071 if (font.getBaseFont() != null) { 072 fonts.add(font); 073 return; 074 } 075 BaseFont bf = font.getCalculatedBaseFont(true); 076 Font f2 = new Font(bf, font.getSize(), font.getCalculatedStyle(), font.getColor()); 077 fonts.add(f2); 078 } 079 080 /** 081 * Process the text so that it will render with a combination of fonts 082 * if needed. 083 * @param text the text 084 * @return a <CODE>Phrase</CODE> with one or more chunks 085 */ 086 public Phrase process(String text) { 087 int fsize = fonts.size(); 088 if (fsize == 0) 089 throw new IndexOutOfBoundsException(MessageLocalization.getComposedMessage("no.font.is.defined")); 090 char cc[] = text.toCharArray(); 091 int len = cc.length; 092 StringBuffer sb = new StringBuffer(); 093 Font font = null; 094 int lastidx = -1; 095 Phrase ret = new Phrase(); 096 for (int k = 0; k < len; ++k) { 097 char c = cc[k]; 098 if (c == '\n' || c == '\r') { 099 sb.append(c); 100 continue; 101 } 102 if (Utilities.isSurrogatePair(cc, k)) { 103 int u = Utilities.convertToUtf32(cc, k); 104 for (int f = 0; f < fsize; ++f) { 105 font = fonts.get(f); 106 if (font.getBaseFont().charExists(u)) { 107 if (lastidx != f) { 108 if (sb.length() > 0 && lastidx != -1) { 109 Chunk ck = new Chunk(sb.toString(), fonts.get(lastidx)); 110 ret.add(ck); 111 sb.setLength(0); 112 } 113 lastidx = f; 114 } 115 sb.append(c); 116 sb.append(cc[++k]); 117 break; 118 } 119 } 120 } 121 else { 122 for (int f = 0; f < fsize; ++f) { 123 font = fonts.get(f); 124 if (font.getBaseFont().charExists(c)) { 125 if (lastidx != f) { 126 if (sb.length() > 0 && lastidx != -1) { 127 Chunk ck = new Chunk(sb.toString(), fonts.get(lastidx)); 128 ret.add(ck); 129 sb.setLength(0); 130 } 131 lastidx = f; 132 } 133 sb.append(c); 134 break; 135 } 136 } 137 } 138 } 139 if (sb.length() > 0) { 140 Chunk ck = new Chunk(sb.toString(), fonts.get(lastidx == -1 ? 0 : lastidx)); 141 ret.add(ck); 142 } 143 return ret; 144 } 145}