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- /*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
- /* $Id$ */
-
- package org.apache.fop.fonts.autodetect;
-
- import java.io.IOException;
- import java.net.URL;
- import java.net.URLConnection;
- import java.util.Collection;
- import java.util.Iterator;
- import java.util.List;
- import java.util.Set;
- import java.util.regex.Pattern;
-
- import org.apache.commons.io.IOUtils;
- import org.apache.commons.logging.Log;
- import org.apache.commons.logging.LogFactory;
- import org.apache.fop.fonts.CachedFontInfo;
- import org.apache.fop.fonts.CustomFont;
- import org.apache.fop.fonts.EmbedFontInfo;
- import org.apache.fop.fonts.Font;
- import org.apache.fop.fonts.FontCache;
- import org.apache.fop.fonts.FontLoader;
- import org.apache.fop.fonts.FontResolver;
- import org.apache.fop.fonts.FontTriplet;
- import org.apache.fop.fonts.FontUtil;
-
- /**
- * Attempts to determine correct FontInfo
- */
- public class FontInfoFinder {
-
- /** logging instance */
- private Log log = LogFactory.getLog(FontInfoFinder.class);
-
- /**
- * Attempts to determine FontTriplets from a given CustomFont.
- * It seems to be fairly accurate but will probably require some tweaking over time
- *
- * @param customFont CustomFont
- * @param triplet Collection that will take the generated triplets
- */
- private void generateTripletsFromFont(CustomFont customFont, Collection triplets) {
- if (log.isTraceEnabled()) {
- log.trace("Font: " + customFont.getFullName()
- + ", family: " + customFont.getFamilyNames()
- + ", PS: " + customFont.getFontName()
- + ", EmbedName: " + customFont.getEmbedFontName());
- }
-
- // default style and weight triplet vales (fallback)
- String strippedName = stripQuotes(customFont.getStrippedFontName());
- String subName = customFont.getFontSubName();
- String searchName = strippedName.toLowerCase();
- if (subName != null) {
- searchName += subName.toLowerCase();
- }
-
- String style = guessStyle(customFont, searchName);
- int weight = FontUtil.guessWeight(searchName);
-
- //Full Name usually includes style/weight info so don't use these traits
- //If we still want to use these traits, we have to make FontInfo.fontLookup() smarter
- String fullName = stripQuotes(customFont.getFullName());
- triplets.add(new FontTriplet(fullName, Font.STYLE_NORMAL, Font.WEIGHT_NORMAL));
- if (!fullName.equals(strippedName)) {
- triplets.add(new FontTriplet(strippedName, Font.STYLE_NORMAL, Font.WEIGHT_NORMAL));
- }
- Set familyNames = customFont.getFamilyNames();
- Iterator iter = familyNames.iterator();
- while (iter.hasNext()) {
- String familyName = stripQuotes((String)iter.next());
- if (!fullName.equals(familyName)) {
- triplets.add(new FontTriplet(familyName, style, weight));
- }
- }
- }
-
- private final Pattern quotePattern = Pattern.compile("'");
-
- private String stripQuotes(String name) {
- return quotePattern.matcher(name).replaceAll("");
- }
-
- private String guessStyle(CustomFont customFont, String fontName) {
- // style
- String style = Font.STYLE_NORMAL;
- if (customFont.getItalicAngle() > 0) {
- style = Font.STYLE_ITALIC;
- } else {
- style = FontUtil.guessStyle(fontName);
- }
- return style;
- }
-
- /**
- * Attempts to determine FontInfo from a given custom font
- * @param fontUrl the font URL
- * @param customFont the custom font
- * @param fontCache font cache (may be null)
- * @return
- */
- private EmbedFontInfo fontInfoFromCustomFont(
- URL fontUrl, CustomFont customFont, FontCache fontCache) {
- List fontTripletList = new java.util.ArrayList();
- generateTripletsFromFont(customFont, fontTripletList);
- String embedUrl;
- embedUrl = fontUrl.toExternalForm();
- EmbedFontInfo fontInfo = new EmbedFontInfo(null, customFont.isKerningEnabled(),
- fontTripletList, embedUrl);
- if (fontCache != null) {
- fontCache.addFont(fontInfo);
- }
- return fontInfo;
- }
-
- /**
- * Attempts to determine EmbedFontInfo from a given font file.
- *
- * @param fontUrl font URL. Assumed to be local.
- * @param resolver font resolver used to resolve font
- * @param fontCache font cache (may be null)
- * @return newly created embed font info
- */
- public EmbedFontInfo find(URL fontUrl, FontResolver resolver, FontCache fontCache) {
- String embedUrl = null;
- embedUrl = fontUrl.toExternalForm();
-
- long fileLastModified = -1;
- if (fontCache != null) {
- try {
- URLConnection conn = fontUrl.openConnection();
- try {
- fileLastModified = conn.getLastModified();
- } finally {
- //An InputStream is created even if it's not accessed, but we need to close it.
- IOUtils.closeQuietly(conn.getInputStream());
- }
- } catch (IOException e) {
- // Should never happen, because URL must be local
- log.debug("IOError: " + e.getMessage());
- fileLastModified = 0;
- }
- // firstly try and fetch it from cache before loading/parsing the font file
- if (fontCache.containsFont(embedUrl)) {
- CachedFontInfo fontInfo = fontCache.getFont(embedUrl);
- if (fontInfo.lastModified() == fileLastModified) {
- return fontInfo;
- } else {
- // out of date cache item
- fontCache.removeFont(embedUrl);
- }
- // is this a previously failed parsed font?
- } else if (fontCache.isFailedFont(embedUrl, fileLastModified)) {
- if (log.isDebugEnabled()) {
- log.debug("Skipping font file that failed to load previously: " + embedUrl);
- }
- return null;
- }
- }
-
- // try to determine triplet information from font file
- CustomFont customFont = null;
- try {
- customFont = FontLoader.loadFont(fontUrl, resolver);
- } catch (Exception e) {
- //TODO Too verbose (it's an error but we don't care if some fonts can't be loaded)
- if (log.isErrorEnabled()) {
- log.error("Unable to load font file: " + embedUrl + ". Reason: " + e.getMessage());
- }
- if (fontCache != null) {
- fontCache.registerFailedFont(embedUrl, fileLastModified);
- }
- return null;
- }
- return fontInfoFromCustomFont(fontUrl, customFont, fontCache);
- }
- }
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