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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.File;
import java.net.MalformedURLException;
import java.util.List;
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;
/**
* Attempts to determine correct FontInfo
*/
public class FontInfoFinder {
/** logging instance */
private Log log = LogFactory.getLog(FontInfoFinder.class);
/** font constituent names which identify a font as being of "italic" style */
private static final String[] ITALIC_WORDS = {"italic", "oblique"};
/** font constituent names which identify a font as being of "bold" weight */
private static final String[] BOLD_WORDS = {"bold", "black", "heavy", "ultra", "super"};
/**
* Attempts to determine FontTriplet from a given CustomFont.
* It seems to be fairly accurate but will probably require some tweaking over time
*
* @param customFont CustomFont
* @return newly created font triplet
*/
private FontTriplet tripletFromFont(CustomFont customFont) {
// default style and weight triplet vales (fallback)
String name = customFont.getStrippedFontName();
String subName = customFont.getFontSubName();
String searchName = name.toLowerCase();
if (subName != null) {
searchName += subName.toLowerCase();
}
// style
String style = Font.STYLE_NORMAL;
if (customFont.getItalicAngle() > 0) {
style = Font.STYLE_ITALIC;
} else {
for (int i = 0; i < ITALIC_WORDS.length; i++) {
if (searchName.indexOf(ITALIC_WORDS[i]) != -1) {
style = Font.STYLE_ITALIC;
break;
}
}
}
// weight
int weight = Font.WEIGHT_NORMAL;
for (int i = 0; i < BOLD_WORDS.length; i++) {
if (searchName.indexOf(BOLD_WORDS[i]) != -1) {
weight = Font.WEIGHT_BOLD;
break;
}
}
return new FontTriplet(name, style, weight);
}
/**
* Attempts to determine FontInfo from a given custom font
* @param fontFile the font file
* @param customFont the custom font
* @param fontCache font cache (may be null)
* @return
*/
private EmbedFontInfo fontInfoFromCustomFont(
File fontFile, CustomFont customFont, FontCache fontCache) {
FontTriplet fontTriplet = tripletFromFont(customFont);
List fontTripletList = new java.util.ArrayList();
fontTripletList.add(fontTriplet);
String embedUrl;
try {
embedUrl = fontFile.toURL().toExternalForm();
} catch (MalformedURLException e) {
embedUrl = fontFile.getAbsolutePath();
}
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 fontFile font file
* @param resolver font resolver used to resolve font
* @param fontCache font cache (may be null)
* @return newly created embed font info
*/
public EmbedFontInfo find(File fontFile, FontResolver resolver, FontCache fontCache) {
String embedUrl = null;
try {
embedUrl = fontFile.toURL().toExternalForm();
} catch (MalformedURLException mfue) {
// should never happen
log.error("Failed to convert '" + fontFile + "' to URL: " + mfue.getMessage() );
}
long fileLastModified = -1;
if (fontCache != null) {
fileLastModified = fontFile.lastModified();
// 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(fontFile, 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(fontFile, customFont, fontCache);
}
}
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