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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;
-
- import java.io.File;
- import java.io.IOException;
- import java.io.InputStream;
- import java.net.MalformedURLException;
- import java.net.URL;
-
- import javax.xml.transform.Source;
- import javax.xml.transform.stream.StreamSource;
-
- import org.apache.commons.logging.Log;
- import org.apache.commons.logging.LogFactory;
-
- import org.apache.fop.fonts.truetype.TTFFontLoader;
- import org.apache.fop.fonts.type1.Type1FontLoader;
-
- /**
- * Base class for font loaders.
- */
- public abstract class FontLoader {
-
- /** logging instance */
- protected static Log log = LogFactory.getLog(FontLoader.class);
-
- /** URI representing the font file */
- protected String fontFileURI = null;
- /** the FontResolver to use for font URI resolution */
- protected FontResolver resolver = null;
- /** the loaded font */
- protected CustomFont returnFont = null;
-
- /** true if the font has been loaded */
- protected boolean loaded = false;
- /** true if the font will be embedded, false if it will be referenced only. */
- protected boolean embedded = true;
- /** true if kerning information shall be loaded if available. */
- protected boolean useKerning = true;
-
- /**
- * Default constructor.
- * @param fontFileURI the URI to the PFB file of a Type 1 font
- * @param embedded indicates whether the font is embedded or referenced
- * @param useKerning indicates whether kerning information shall be loaded if available
- * @param resolver the font resolver used to resolve URIs
- */
- public FontLoader(String fontFileURI, boolean embedded, boolean useKerning,
- FontResolver resolver) {
- this.fontFileURI = fontFileURI;
- this.embedded = embedded;
- this.useKerning = useKerning;
- this.resolver = resolver;
- }
-
- private static boolean isType1(String fontURI) {
- return fontURI.toLowerCase().endsWith(".pfb");
- }
-
- /**
- * Loads a custom font from a File. In the case of Type 1 fonts, the PFB file must be specified.
- * @param fontFile the File representation of the font
- * @param subFontName the sub-fontname of a font (for TrueType Collections, null otherwise)
- * @param embedded indicates whether the font is embedded or referenced
- * @param encodingMode the requested encoding mode
- * @param resolver the font resolver to use when resolving URIs
- * @return the newly loaded font
- * @throws IOException In case of an I/O error
- */
- public static CustomFont loadFont(File fontFile, String subFontName,
- boolean embedded, EncodingMode encodingMode, FontResolver resolver) throws IOException {
- return loadFont(fontFile.getAbsolutePath(), subFontName,
- embedded, encodingMode, true, resolver);
- }
-
- /**
- * Loads a custom font from an URL. In the case of Type 1 fonts, the PFB file must be specified.
- * @param fontUrl the URL representation of the font
- * @param subFontName the sub-fontname of a font (for TrueType Collections, null otherwise)
- * @param embedded indicates whether the font is embedded or referenced
- * @param encodingMode the requested encoding mode
- * @param resolver the font resolver to use when resolving URIs
- * @return the newly loaded font
- * @throws IOException In case of an I/O error
- */
- public static CustomFont loadFont(URL fontUrl, String subFontName,
- boolean embedded, EncodingMode encodingMode,
- FontResolver resolver) throws IOException {
- return loadFont(fontUrl.toExternalForm(), subFontName,
- embedded, encodingMode, true,
- resolver);
- }
-
- /**
- * Loads a custom font from a URI. In the case of Type 1 fonts, the PFB file must be specified.
- * @param fontFileURI the URI to the font
- * @param subFontName the sub-fontname of a font (for TrueType Collections, null otherwise)
- * @param embedded indicates whether the font is embedded or referenced
- * @param encodingMode the requested encoding mode
- * @param useKerning indicates whether kerning information should be loaded if available
- * @param resolver the font resolver to use when resolving URIs
- * @return the newly loaded font
- * @throws IOException In case of an I/O error
- */
- public static CustomFont loadFont(String fontFileURI, String subFontName,
- boolean embedded, EncodingMode encodingMode, boolean useKerning,
- FontResolver resolver) throws IOException {
- fontFileURI = fontFileURI.trim();
- boolean type1 = isType1(fontFileURI);
- FontLoader loader;
- if (type1) {
- if (encodingMode == EncodingMode.CID) {
- throw new IllegalArgumentException(
- "CID encoding mode not supported for Type 1 fonts");
- }
- loader = new Type1FontLoader(fontFileURI, embedded, useKerning, resolver);
- } else {
- loader = new TTFFontLoader(fontFileURI, subFontName,
- embedded, encodingMode, useKerning, resolver);
- }
- return loader.getFont();
- }
-
- /**
- * Opens a font URI and returns an input stream.
- * @param resolver the FontResolver to use for font URI resolution
- * @param uri the URI representing the font
- * @return the InputStream to read the font from.
- * @throws IOException In case of an I/O error
- * @throws MalformedURLException If an invalid URL is built
- */
- public static InputStream openFontUri(FontResolver resolver, String uri)
- throws IOException, MalformedURLException {
- InputStream in = null;
- if (resolver != null) {
- Source source = resolver.resolve(uri);
- if (source == null) {
- String err = "Cannot load font: failed to create Source for font file "
- + uri;
- throw new IOException(err);
- }
- if (source instanceof StreamSource) {
- in = ((StreamSource) source).getInputStream();
- }
- if (in == null && source.getSystemId() != null) {
- in = new java.net.URL(source.getSystemId()).openStream();
- }
- if (in == null) {
- String err = "Cannot load font: failed to create InputStream from"
- + " Source for font file " + uri;
- throw new IOException(err);
- }
- } else {
- in = new URL(uri).openStream();
- }
- return in;
- }
-
- /**
- * Reads/parses the font data.
- * @throws IOException In case of an I/O error
- */
- protected abstract void read() throws IOException;
-
- /**
- * Returns the custom font that was read using this instance of FontLoader.
- * @return the newly loaded font
- * @throws IOException if an I/O error occurs
- */
- public CustomFont getFont() throws IOException {
- if (!loaded) {
- read();
- }
- return this.returnFont;
- }
- }
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