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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.
*/
package org.apache.camel.component.cxf.converter;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.ListIterator;
import java.util.Map;
import java.util.Properties;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stax.StAXSource;
import javax.xml.transform.stream.StreamResult;
import org.apache.camel.Exchange;
import org.apache.camel.StreamCache;
import org.apache.camel.component.cxf.common.CxfPayload;
import org.apache.camel.converter.stream.CachedOutputStream;
import org.apache.camel.support.builder.xml.XMLConverterHelper;
import org.apache.camel.util.ObjectHelper;
import org.apache.camel.util.xml.StreamSourceCache;
import org.apache.cxf.staxutils.StaxSource;
import org.apache.cxf.staxutils.StaxUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* {@link org.apache.camel.StreamCache} implementation for CXF payload.
*
* Important: All the classes from the Camel release that implements {@link StreamCache} is NOT intended for end
* users to create as instances, but they are part of Camels
* stream-caching functionality.
*/
public class CachedCxfPayload extends CxfPayload implements StreamCache {
private static final Logger LOG = LoggerFactory.getLogger(CachedCxfPayload.class);
private static String defaultCharset = ObjectHelper.getSystemProperty("org.apache.camel.default.charset", "UTF-8");
public CachedCxfPayload(CxfPayload orig, Exchange exchange) {
super(orig.getHeaders(), new ArrayList<>(orig.getBodySources()), orig.getNsMap());
ListIterator li = getBodySources().listIterator();
while (li.hasNext()) {
Source source = li.next();
XMLStreamReader reader = null;
// namespace definitions that are on the SOAP envelope can get lost, if this is
// not a DOM (there is special coding on the CXFPayload.getBody().get() method for
// this, that only works on DOM nodes.
// We have to do some delegation on the XMLStreamReader for StAXSource and StaxSource
// that re-injects the missing namespaces into the XMLStreamReader.
// Replace all other Sources that are not DOMSources with DOMSources.
if (source instanceof StaxSource) {
reader = ((StaxSource) source).getXMLStreamReader();
} else if (source instanceof StAXSource) {
reader = ((StAXSource) source).getXMLStreamReader();
}
if (reader != null) {
Map nsmap = getNsMap();
if (nsmap != null && !(reader instanceof DelegatingXMLStreamReader)) {
reader = new DelegatingXMLStreamReader(reader, nsmap);
}
CachedOutputStream cos = new CachedOutputStream(exchange);
try {
StaxUtils.copy(reader, cos);
li.set(new StreamSourceCache(cos.newStreamCache()));
// this worked so continue
continue;
} catch (Exception e) {
// fallback to trying to read the reader using another way
StreamResult sr = new StreamResult(cos);
try {
toResult(source, sr);
li.set(new StreamSourceCache(cos.newStreamCache()));
// this worked so continue
continue;
} catch (Exception e2) {
// ignore did not work so we will fallback to DOM mode
// this can happens in some rare cases such as reported by CAMEL-11681
LOG.debug(
"Error during parsing XMLStreamReader from StaxSource/StAXSource. Will fallback to using DOM mode. This exception is ignored",
e2);
}
}
}
// fallback to using DOM
DOMSource document = exchange.getContext().getTypeConverter().tryConvertTo(DOMSource.class, exchange, source);
if (document != null) {
li.set(document);
}
}
orig.setBodySources(getBodySources());
}
private CachedCxfPayload(CachedCxfPayload orig, Exchange exchange) throws IOException {
super(orig.getHeaders(), new ArrayList<>(orig.getBodySources()), orig.getNsMap());
ListIterator li = getBodySources().listIterator();
while (li.hasNext()) {
Source source = li.next();
if (source instanceof StreamCache) {
li.set((Source) (((StreamCache) source)).copy(exchange));
}
}
}
private static void toResult(Source source, Result result) throws TransformerException {
if (source != null) {
XMLConverterHelper xml = new XMLConverterHelper();
TransformerFactory factory = xml.getTransformerFactory();
Transformer transformer = factory.newTransformer();
if (transformer == null) {
throw new TransformerException("Could not create a transformer - JAXP is misconfigured!");
} else {
Properties outputProperties = new Properties();
outputProperties.put("encoding", defaultCharset);
outputProperties.put("omit-xml-declaration", "yes");
transformer.setOutputProperties(outputProperties);
transformer.transform(source, result);
}
}
}
@Override
public void reset() {
for (Source source : getBodySources()) {
if (source instanceof StreamCache) {
((StreamCache) source).reset();
}
}
}
@Override
public void writeTo(OutputStream os) throws IOException {
// no body no write
if (getBodySources().isEmpty()) {
return;
}
Source body = getBodySources().get(0);
if (body instanceof StreamCache) {
((StreamCache) body).writeTo(os);
} else {
try {
StaxUtils.copy(body, os);
} catch (XMLStreamException e) {
throw new IOException("Transformation failed", e);
}
}
}
@Override
public boolean inMemory() {
boolean inMemory = true;
for (Source source : getBodySources()) {
if (source instanceof StreamCache && !((StreamCache) source).inMemory()) {
inMemory = false;
}
}
return inMemory;
}
@Override
public long length() {
return 0;
}
@Override
public StreamCache copy(Exchange exchange) throws IOException {
return new CachedCxfPayload<>(this, exchange);
}
}
