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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;
//Java
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import org.apache.fop.apps.FOPException;
import org.apache.fop.apps.io.InternalResourceResolver;
import org.apache.fop.fonts.apps.TTFReader;
/**
* Class for reading a metric.xml file and creating a font object.
* Typical usage:
* <pre>
* FontReader reader = new FontReader(<path til metrics.xml>);
* reader.setFontEmbedPath(<path to a .ttf or .pfb file or null to diable embedding>);
* reader.useKerning(true);
* Font f = reader.getFont();
* </pre>
*/
public class FontReader extends DefaultHandler {
private boolean isCID;
private CustomFont returnFont;
private MultiByteFont multiFont;
private SingleByteFont singleFont;
private final InternalResourceResolver resourceResolver;
private StringBuffer text = new StringBuffer();
private List<Integer> cidWidths;
//private int cidWidthIndex;
private Map<Integer, Integer> currentKerning;
private List<CMapSegment> bfranges;
/**
* Construct a FontReader object from a path to a metric.xml file
* and read metric data
* @param source Source of the font metric file
* @throws FOPException if loading the font fails
*/
public FontReader(InputSource source, InternalResourceResolver resourceResolver) throws FOPException {
this.resourceResolver = resourceResolver;
createFont(source);
}
private void createFont(InputSource source) throws FOPException {
XMLReader parser = null;
try {
final SAXParserFactory factory = javax.xml.parsers.SAXParserFactory.newInstance();
factory.setNamespaceAware(true);
parser = factory.newSAXParser().getXMLReader();
} catch (Exception e) {
throw new FOPException(e);
}
if (parser == null) {
throw new FOPException("Unable to create SAX parser");
}
try {
parser.setFeature("http://xml.org/sax/features/namespace-prefixes", false);
} catch (SAXException e) {
throw new FOPException("You need a SAX parser which supports SAX version 2", e);
}
parser.setContentHandler(this);
try {
parser.parse(source);
} catch (SAXException e) {
throw new FOPException(e);
} catch (IOException e) {
throw new FOPException(e);
}
}
/**
* Sets the path to embed a font. A null value disables font embedding.
* @param path URI for the embeddable file
*/
public void setFontEmbedURI(URI path) {
returnFont.setEmbedURI(path);
}
/**
* Enable/disable use of kerning for the font
* @param enabled true to enable kerning, false to disable
*/
public void setKerningEnabled(boolean enabled) {
returnFont.setKerningEnabled(enabled);
}
/**
* Enable/disable use of advanced typographic features for the font
* @param enabled true to enable, false to disable
*/
public void setAdvancedEnabled(boolean enabled) {
returnFont.setAdvancedEnabled(enabled);
}
/**
* Get the generated font object
* @return the font
*/
public Typeface getFont() {
return returnFont;
}
/**
* {@inheritDoc}
*/
@Override
public void startDocument() {
}
/**
* {@inheritDoc}
*/
public void startElement(String uri, String localName, String qName, Attributes attributes)
throws SAXException {
if (localName.equals("font-metrics")) {
if ("TYPE0".equals(attributes.getValue("type"))) {
multiFont = new MultiByteFont(resourceResolver);
returnFont = multiFont;
isCID = true;
TTFReader.checkMetricsVersion(attributes);
} else if ("TRUETYPE".equals(attributes.getValue("type"))) {
singleFont = new SingleByteFont(resourceResolver);
singleFont.setFontType(FontType.TRUETYPE);
returnFont = singleFont;
isCID = false;
TTFReader.checkMetricsVersion(attributes);
} else {
singleFont = new SingleByteFont(resourceResolver);
singleFont.setFontType(FontType.TYPE1);
returnFont = singleFont;
isCID = false;
}
} else if ("embed".equals(localName)) {
try {
returnFont.setEmbedURI(InternalResourceResolver.cleanURI(attributes.getValue("file")));
} catch (URISyntaxException e) {
throw new SAXException("URI syntax error in metrics file: " + e.getMessage(), e);
}
returnFont.setEmbedResourceName(attributes.getValue("class"));
} else if ("cid-widths".equals(localName)) {
// This is unused
// cidWidthIndex = getInt(attributes.getValue("start-index"));
cidWidths = new ArrayList<Integer>();
} else if ("kerning".equals(localName)) {
currentKerning = new HashMap<Integer, Integer>();
returnFont.putKerningEntry(getInt(attributes.getValue("kpx1")),
currentKerning);
} else if ("bfranges".equals(localName)) {
bfranges = new ArrayList<CMapSegment>();
} else if ("bf".equals(localName)) {
CMapSegment entry = new CMapSegment(getInt(attributes.getValue("us")),
getInt(attributes.getValue("ue")),
getInt(attributes.getValue("gi")));
bfranges.add(entry);
} else if ("wx".equals(localName)) {
cidWidths.add(getInt(attributes.getValue("w")));
// } else if ("widths".equals(localName)) {
// singleFont.width = new int[256];
} else if ("char".equals(localName)) {
try {
singleFont.setWidth(getInt(attributes.getValue("idx")),
getInt(attributes.getValue("wdt")));
} catch (NumberFormatException ne) {
throw new SAXException("Malformed width in metric file: " + ne.getMessage(), ne);
}
} else if ("pair".equals(localName)) {
currentKerning.put(getInt(attributes.getValue("kpx2")),
getInt(attributes.getValue("kern")));
}
}
private int getInt(String str) throws SAXException {
int ret = 0;
try {
ret = Integer.parseInt(str);
} catch (Exception e) {
throw new SAXException("Error while parsing integer value: " + str, e);
}
return ret;
}
/**
* {@inheritDoc}
*/
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
String content = text.toString().trim();
if ("font-name".equals(localName)) {
returnFont.setFontName(content);
} else if ("full-name".equals(localName)) {
returnFont.setFullName(content);
} else if ("family-name".equals(localName)) {
Set<String> s = new HashSet<String>();
s.add(content);
returnFont.setFamilyNames(s);
} else if ("ttc-name".equals(localName) && isCID) {
multiFont.setTTCName(content);
} else if ("encoding".equals(localName)) {
if (singleFont != null && singleFont.getFontType() == FontType.TYPE1) {
singleFont.setEncoding(content);
}
} else if ("cap-height".equals(localName)) {
returnFont.setCapHeight(getInt(content));
} else if ("x-height".equals(localName)) {
returnFont.setXHeight(getInt(content));
} else if ("ascender".equals(localName)) {
returnFont.setAscender(getInt(content));
} else if ("descender".equals(localName)) {
returnFont.setDescender(getInt(content));
} else if ("left".equals(localName)) {
int[] bbox = returnFont.getFontBBox();
bbox[0] = getInt(content);
returnFont.setFontBBox(bbox);
} else if ("bottom".equals(localName)) {
int[] bbox = returnFont.getFontBBox();
bbox[1] = getInt(content);
returnFont.setFontBBox(bbox);
} else if ("right".equals(localName)) {
int[] bbox = returnFont.getFontBBox();
bbox[2] = getInt(content);
returnFont.setFontBBox(bbox);
} else if ("top".equals(localName)) {
int[] bbox = returnFont.getFontBBox();
bbox[3] = getInt(content);
returnFont.setFontBBox(bbox);
} else if ("first-char".equals(localName)) {
returnFont.setFirstChar(getInt(content));
} else if ("last-char".equals(localName)) {
returnFont.setLastChar(getInt(content));
} else if ("flags".equals(localName)) {
returnFont.setFlags(getInt(content));
} else if ("stemv".equals(localName)) {
returnFont.setStemV(getInt(content));
} else if ("italic-angle".equals(localName)) {
returnFont.setItalicAngle(getInt(content));
} else if ("missing-width".equals(localName)) {
returnFont.setMissingWidth(getInt(content));
} else if ("cid-type".equals(localName)) {
multiFont.setCIDType(CIDFontType.byName(content));
} else if ("default-width".equals(localName)) {
multiFont.setDefaultWidth(getInt(content));
} else if ("cid-widths".equals(localName)) {
int[] wds = new int[cidWidths.size()];
int j = 0;
for (int count = 0; count < cidWidths.size(); count++) {
wds[j++] = cidWidths.get(count).intValue();
}
//multiFont.addCIDWidthEntry(cidWidthIndex, wds);
multiFont.setWidthArray(wds);
} else if ("bfranges".equals(localName)) {
multiFont.setCMap(bfranges.toArray(new CMapSegment[0]));
}
text.setLength(0); //Reset text buffer (see characters())
}
/**
* {@inheritDoc}
*/
@Override
public void characters(char[] ch, int start, int length) {
text.append(ch, start, length);
}
}
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