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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.render.afp.tools;
import java.io.IOException;
import java.net.URL;
import org.apache.fop.render.afp.exceptions.FontRuntimeException;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
/**
* An entity resolver for both DOM and SAX models of the SAX document.
* <p>
* 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}.
* <p>
* @author <a href="mailto:joe@exubero.com">Joe Schmetzer</a>
*/
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;
}
}
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