/*
* 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.ode.bpel.elang.xpath10.runtime;
import org.apache.ode.bpel.elang.xpath10.o.OXPath10Expression;
import org.apache.ode.bpel.o.OXslSheet;
import org.apache.ode.utils.StreamUtils;
import org.apache.ode.utils.fs.FileUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import javax.xml.transform.URIResolver;
import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.stream.StreamSource;
import java.net.URI;
import java.net.URISyntaxException;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
/**
* Used to give the Xsl processor a way to access included XSL sheets
* by using the maps of sheets pre-processed at compilation time and
* stored in the OXPath10Expression.
*/
public class XslRuntimeUriResolver implements URIResolver {
private static final Log __log = LogFactory.getLog(XslRuntimeUriResolver.class);
private OXPath10Expression _expr;
private final URI _baseResourceURI;
public XslRuntimeUriResolver(OXPath10Expression expr, URI baseResourceURI) {
_expr = expr;
_baseResourceURI= baseResourceURI;
}
public Source resolve(String href, String base) throws TransformerException {
String result;
URI uri;
try {
uri = new URI(FileUtils.encodePath(href));
} catch (URISyntaxException e) {
return null;
}
OXslSheet sheet = _expr.xslSheets.get(uri);
if( sheet != null) {
result = sheet.sheetBody;
} else {
result = getResourceAsString(uri);
}
if( result != null ) {
return new StreamSource(new StringReader(result));
} else {
return null;
}
}
/**
* Given a URI this function will attempt to retrieve the resource declared at that URI location
* as a string. (Hopefully everything's character encodings are all ok...) This URI can be
* defined as being relative to the executing process instance's physical file location.
*
* @param docUri - the URI to resolve
* @return String - the resource contents, or null if none found.
*/
private String getResourceAsString(URI docUri) {
URI resolvedURI= _baseResourceURI.resolve(docUri);
InputStream is = null;
try {
File f = new File(resolvedURI);
if (!f.exists()) return null;
is = new FileInputStream(f);
return new String(StreamUtils.read(is));
} catch (IOException e) {
__log.info("Couldn't load XSL resource " + docUri);
} finally {
try {
if (is != null) is.close();
} catch (Exception ex) {
// No worries.
}
}
return null;
}
}