// BootstrapResolver.java - Resolve entities and URIs internally
/*
* 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.
*/
package mf.org.apache.xml.resolver.helpers;
import java.util.Hashtable;
import java.net.URL;
import java.net.MalformedURLException;
import java.io.InputStream;
import mf.javax.xml.transform.URIResolver;
import mf.javax.xml.transform.Source;
import mf.javax.xml.transform.sax.SAXSource;
import mf.javax.xml.transform.TransformerException;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
/**
* A simple bootstrapping resolver.
*
* <p>This class is used as the entity resolver when reading XML Catalogs.
* It searches for the OASIS XML Catalog DTD, Relax NG Grammar and W3C XML Schema
* as resources (e.g., in the resolver jar file).</p>
*
* <p>If you have your own DTDs or schemas, you can extend this class and
* set the BootstrapResolver in your CatalogManager.</p>
*
* @see mf.org.apache.xml.resolver.CatalogManager
*
* @author Norman Walsh
* <a href="mailto:Norman.Walsh@Sun.COM">Norman.Walsh@Sun.COM</a>
*
* @version 1.0
*/
public class BootstrapResolver implements EntityResolver, URIResolver {
/** URI of the W3C XML Schema for OASIS XML Catalog files. */
public static final String xmlCatalogXSD = "http://www.oasis-open.org/committees/entity/release/1.0/catalog.xsd";
/** URI of the RELAX NG Grammar for OASIS XML Catalog files. */
public static final String xmlCatalogRNG = "http://www.oasis-open.org/committees/entity/release/1.0/catalog.rng";
/** Public identifier for OASIS XML Catalog files. */
public static final String xmlCatalogPubId = "-//OASIS//DTD XML Catalogs V1.0//EN";
/** System identifier for OASIS XML Catalog files. */
public static final String xmlCatalogSysId = "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd";
/** Public identifier for legacy Apache XCatalog files. There is no official system identifier for XCatalog files. */
public static final String xCatalogPubId = "-//DTD XCatalog//EN";
/** Private hash used for public identifiers. */
private Hashtable publicMap = new Hashtable();
/** Private hash used for system identifiers. */
private Hashtable systemMap = new Hashtable();
/** Private hash used for URIs. */
private Hashtable uriMap = new Hashtable();
/** Constructor. */
public BootstrapResolver() {
URL url = this.getClass().getResource("/org/apache/xml/resolver/etc/catalog.dtd");
if (url != null) {
publicMap.put(xmlCatalogPubId, url.toString());
systemMap.put(xmlCatalogSysId, url.toString());
}
url = this.getClass().getResource("/org/apache/xml/resolver/etc/catalog.rng");
if (url != null) {
uriMap.put(xmlCatalogRNG, url.toString());
}
url = this.getClass().getResource("/org/apache/xml/resolver/etc/catalog.xsd");
if (url != null) {
uriMap.put(xmlCatalogXSD, url.toString());
}
url = this.getClass().getResource("/org/apache/xml/resolver/etc/xcatalog.dtd");
if (url != null) {
publicMap.put(xCatalogPubId, url.toString());
}
}
/** SAX resolveEntity API. */
public InputSource resolveEntity (String publicId, String systemId) {
String resolved = null;
if (systemId != null && systemMap.containsKey(systemId)) {
resolved = (String) systemMap.get(systemId);
} else if (publicId != null && publicMap.containsKey(publicId)) {
resolved = (String) publicMap.get(publicId);
}
if (resolved != null) {
try {
InputSource iSource = new InputSource(resolved);
iSource.setPublicId(publicId);
// Ideally this method would not attempt to open the
// InputStream, but there is a bug (in Xerces, at least)
// that causes the parser to mistakenly open the wrong
// system identifier if the returned InputSource does
// not have a byteStream.
//
// It could be argued that we still shouldn't do this here,
// but since the purpose of calling the entityResolver is
// almost certainly to open the input stream, it seems to
// do little harm.
//
URL url = new URL(resolved);
InputStream iStream = url.openStream();
iSource.setByteStream(iStream);
return iSource;
} catch (Exception e) {
// FIXME: silently fail?
return null;
}
}
return null;
}
/** Transformer resolve API. */
public Source resolve(String href, String base)
throws TransformerException {
String uri = href;
String fragment = null;
int hashPos = href.indexOf("#");
if (hashPos >= 0) {
uri = href.substring(0, hashPos);
fragment = href.substring(hashPos+1);
}
String result = null;
if (href != null && uriMap.containsKey(href)) {
result = (String) uriMap.get(href);
}
if (result == null) {
try {
URL url = null;
if (base==null) {
url = new URL(uri);
result = url.toString();
} else {
URL baseURL = new URL(base);
url = (href.length()==0 ? baseURL : new URL(baseURL, uri));
result = url.toString();
}
} catch (java.net.MalformedURLException mue) {
// try to make an absolute URI from the current base
String absBase = makeAbsolute(base);
if (!absBase.equals(base)) {
// don't bother if the absBase isn't different!
return resolve(href, absBase);
} else {
throw new TransformerException("Malformed URL "
+ href + "(base " + base + ")",
mue);
}
}
}
SAXSource source = new SAXSource();
source.setInputSource(new InputSource(result));
return source;
}
/** Attempt to construct an absolute URI */
private String makeAbsolute(String uri) {
if (uri == null) {
uri = "";
}
try {
URL url = new URL(uri);
return url.toString();
} catch (MalformedURLException mue) {
try {
URL fileURL = FileURL.makeURL(uri);
return fileURL.toString();
} catch (MalformedURLException mue2) {
// bail
return uri;
}
}
}
}