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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.IOException;
- import java.net.URI;
-
- import org.apache.commons.logging.Log;
- import org.apache.commons.logging.LogFactory;
-
- import org.apache.fop.apps.io.InternalResourceResolver;
- import org.apache.fop.fonts.truetype.OFFontLoader;
- import org.apache.fop.fonts.type1.Type1FontLoader;
-
- /**
- * Base class for font loaders.
- */
- public abstract class FontLoader {
-
- /** logging instance */
- protected static final Log log = LogFactory.getLog(FontLoader.class);
-
- /** URI representing the font file */
- protected final URI fontFileURI;
- /** the resource resolver to use for font URI resolution */
- protected final InternalResourceResolver resourceResolver;
- /** the loaded font */
- protected CustomFont returnFont;
-
- /** true if the font has been loaded */
- protected boolean loaded;
- /** true if the font will be embedded, false if it will be referenced only. */
- protected boolean embedded;
- /** true if kerning information false be loaded if available. */
- protected boolean useKerning;
- /** true if advanced typographic information shall be loaded if available. */
- protected boolean useAdvanced;
-
- /**
- * 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 useAdvanced indicates whether advanced typographic information shall be loaded if
- * available
- * @param resourceResolver the font resolver used to resolve URIs
- */
- public FontLoader(URI fontFileURI, boolean embedded, boolean useKerning,
- boolean useAdvanced, InternalResourceResolver resourceResolver) {
- this.fontFileURI = fontFileURI;
- this.embedded = embedded;
- this.useKerning = useKerning;
- this.useAdvanced = useAdvanced;
- this.resourceResolver = resourceResolver;
- }
-
- private static boolean isType1(URI fontURI) {
- return fontURI.toASCIIString().toLowerCase().endsWith(".pfb");
- }
-
- /**
- * 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 embeddingMode the embedding mode of the font
- * @param encodingMode the requested encoding mode
- * @param useKerning indicates whether kerning information should be loaded if available
- * @param useAdvanced indicates whether advanced typographic information shall be loaded if
- * available
- * @param resourceResolver 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(URI fontFileURI, String subFontName,
- boolean embedded, EmbeddingMode embeddingMode, EncodingMode encodingMode,
- boolean useKerning, boolean useAdvanced, InternalResourceResolver resourceResolver) throws IOException {
- boolean type1 = isType1(fontFileURI);
- FontLoader loader;
- if (type1) {
- if (encodingMode == EncodingMode.CID) {
- throw new IllegalArgumentException(
- "CID encoding mode not supported for Type 1 fonts");
- }
- if (embeddingMode == EmbeddingMode.SUBSET) {
- throw new IllegalArgumentException(
- "Subset embedding for Type 1 fonts is not supported");
- }
- loader = new Type1FontLoader(fontFileURI, embedded, useKerning, resourceResolver);
- } else {
- loader = new OFFontLoader(fontFileURI, subFontName, embedded, embeddingMode,
- encodingMode, useKerning, useAdvanced, resourceResolver);
- }
- return loader.getFont();
- }
-
- /**
- * 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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