/* * 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.apache.fop.afp.fonts.FontRuntimeException; import org.xml.sax.EntityResolver; import org.xml.sax.InputSource; /** * An entity resolver for both DOM and SAX models of the SAX document. *

* 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}. *

* @author Joe Schmetzer */ 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 resourceName 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; } }