/**
* 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 org.apache.camel.builder.xml;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.URIResolver;
import javax.xml.transform.stream.StreamSource;
import org.apache.camel.CamelContext;
import org.apache.camel.util.FileUtil;
import org.apache.camel.util.ObjectHelper;
import org.apache.camel.util.ResourceHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Camel specific {@link javax.xml.transform.URIResolver} which is capable of loading files
* from the classpath and file system.
* <p/>
* Use prefix <tt>classpath:</tt> or <tt>file:</tt> to denote either classpath or file system.
* If no prefix is provided then the prefix from the <tt>location</tt> parameter is used.
* If it neither has a prefix then <tt>classpath:</tt> is used.
* <p/>
* This implementation <b>cannot</b> load files over http.
*
* @version
*/
public class XsltUriResolver implements URIResolver {
private static final Logger LOG = LoggerFactory.getLogger(XsltUriResolver.class);
private final CamelContext context;
private final String location;
private final String baseScheme;
public XsltUriResolver(CamelContext context, String location) {
this.context = context;
this.location = location;
if (ResourceHelper.hasScheme(location)) {
baseScheme = ResourceHelper.getScheme(location);
} else {
// default to use classpath
baseScheme = "classpath:";
}
}
@Override
public Source resolve(String href, String base) throws TransformerException {
// supports the empty href
if (ObjectHelper.isEmpty(href)) {
href = location;
}
if (ObjectHelper.isEmpty(href)) {
throw new TransformerException("include href is empty");
}
LOG.trace("Resolving URI with href: {} and base: {}", href, base);
String scheme = ResourceHelper.getScheme(href);
if (scheme != null) {
// need to compact paths for file/classpath as it can be relative paths using .. to go backwards
if ("file:".equals(scheme)) {
// compact path use file OS separator
href = FileUtil.compactPath(href);
} else if ("classpath:".equals(scheme)) {
// for classpath always use /
href = FileUtil.compactPath(href, '/');
}
LOG.debug("Resolving URI from {}: {}", scheme, href);
InputStream is;
try {
is = ResourceHelper.resolveMandatoryResourceAsInputStream(context, href);
} catch (IOException e) {
throw new TransformerException(e);
}
return new StreamSource(is);
}
// if href and location is the same, then its the initial resolve
if (href.equals(location)) {
String path = baseScheme + href;
return resolve(path, base);
}
// okay then its relative to the starting location from the XSLT component
String path = FileUtil.onlyPath(location);
if (ObjectHelper.isEmpty(path)) {
path = baseScheme + href;
return resolve(path, base);
} else {
if (ResourceHelper.hasScheme(path)) {
path = path + "/" + href;
} else {
path = baseScheme + path + "/" + href;
}
return resolve(path, base);
}
}
}