| /* |
| * 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.afp.util; |
| |
| import java.io.IOException; |
| import java.net.URL; |
| |
| import org.xml.sax.EntityResolver; |
| import org.xml.sax.InputSource; |
| |
| import org.apache.fop.afp.fonts.FontRuntimeException; |
| |
| /** |
| * An entity resolver for both DOM and SAX models of the SAX document.<br> |
| * The entity resolver only handles queries for the DTD. It will find any URI |
| * with a recognised public id and return an {@link org.xml.sax.InputSource}. |
| * <br> |
| * |
| * <p>This work was authored by Joe Schmetzer (joe@exubero.com).</p> |
| */ |
| public class DTDEntityResolver implements EntityResolver { |
| |
| /** Public ID for the AFP fonts 1.0 DTD. */ |
| public static final String AFP_DTD_1_0_ID |
| = "-//APACHE/DTD AFP Installed Font Definition DTD 1.0//EN"; |
| |
| /** Resource location for the AFP fonts 1.0 DTD. */ |
| public static final String AFP_DTD_1_0_RESOURCE |
| = "afp-fonts-1.0.dtd"; |
| |
| /** Public ID for the AFP fonts 1.1 DTD. */ |
| public static final String AFP_DTD_1_1_ID |
| = "-//APACHE/DTD AFP Installed Font Definition DTD 1.1//EN"; |
| |
| /** Resource location for the AFP fonts 1.1 DTD. */ |
| public static final String AFP_DTD_1_1_RESOURCE |
| = "afp-fonts-1.1.dtd"; |
| |
| /** Public ID for the AFP fonts 1.2 DTD. */ |
| public static final String AFP_DTD_1_2_ID |
| = "-//APACHE/DTD AFP Installed Font Definition DTD 1.2//EN"; |
| |
| /** Resource location for the AFP fonts 1.2 DTD. */ |
| public static final String AFP_DTD_1_2_RESOURCE |
| = "afp-fonts-1.2.dtd"; |
| |
| /** |
| * Resolve the combination of system and public identifiers. |
| * If this resolver recognises the publicId, it will handle the resolution |
| * from the classpath, otherwise it will return null and allow the default |
| * resolution to occur. |
| * |
| * @param publicId the public identifier to use |
| * @param systemId the system identifier to resolve |
| * @return An input source to the entity or null if not handled |
| * @throws IOException an error reading the stream |
| */ |
| public InputSource resolveEntity(String publicId, String systemId) |
| throws IOException { |
| |
| URL resource = null; |
| if (AFP_DTD_1_2_ID.equals(publicId)) { |
| resource = getResource(AFP_DTD_1_2_RESOURCE); |
| } else if (AFP_DTD_1_1_ID.equals(publicId)) { |
| resource = getResource(AFP_DTD_1_1_RESOURCE); |
| } else if (AFP_DTD_1_0_ID.equals(publicId)) { |
| throw new FontRuntimeException( |
| "The AFP Installed Font Definition 1.0 DTD is not longer supported"); |
| } else if (systemId != null && systemId.indexOf("afp-fonts.dtd") >= 0) { |
| throw new FontRuntimeException( |
| "The AFP Installed Font Definition DTD must be specified using the public id"); |
| } else { |
| return null; |
| } |
| |
| InputSource inputSource = new InputSource(resource.openStream()); |
| inputSource.setPublicId(publicId); |
| inputSource.setSystemId(systemId); |
| |
| return inputSource; |
| } |
| |
| /** |
| * Returns the URL of a resource on the classpath |
| * @param resourcePath the path to the resource relative to the root of the |
| * classpath. |
| * @return the URL of the required resource |
| * @throws FontRuntimeException if the resource could not be found. |
| */ |
| private URL getResource(String resourcePath) { |
| ClassLoader cl = Thread.currentThread().getContextClassLoader(); |
| if (cl == null) { |
| cl = ClassLoader.getSystemClassLoader(); |
| } |
| |
| URL resource = cl.getResource(resourcePath); |
| if (resource == null) { |
| throw new FontRuntimeException("Resource " + resourcePath |
| + "could not be found on the classpath"); |
| } |
| |
| return resource; |
| } |
| } |