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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.InputStream;
import java.io.Reader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stax.StAXSource;
import javax.xml.transform.stream.StreamSource;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.apache.camel.Converter;
import org.apache.camel.Exchange;
import org.apache.camel.RuntimeCamelException;
import org.apache.camel.StreamCache;
import org.apache.camel.TypeConverter;
import org.apache.camel.component.cxf.common.CxfPayload;
import org.apache.camel.spi.TypeConverterRegistry;
import org.apache.cxf.staxutils.StaxSource;
import org.apache.cxf.staxutils.StaxUtils;
import static org.apache.camel.TypeConverter.MISS_VALUE;
@Converter(generateLoader = true)
public final class CxfPayloadConverter {
private CxfPayloadConverter() {
// Helper class
}
@Converter
public static CxfPayload documentToCxfPayload(Document doc, Exchange exchange) {
return elementToCxfPayload(doc.getDocumentElement(), exchange);
}
@Converter
public static CxfPayload elementToCxfPayload(Element element, Exchange exchange) {
List headers = new ArrayList<>();
List body = new ArrayList<>();
body.add(element);
return new CxfPayload<>(headers, body);
}
@Converter
public static CxfPayload nodeListToCxfPayload(NodeList nodeList, Exchange exchange) {
List headers = new ArrayList<>();
List body = new ArrayList<>();
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
// add all nodes to the body that are elements
if (Element.class.isAssignableFrom(node.getClass())) {
body.add((Element) node);
}
}
return new CxfPayload<>(headers, body);
}
@Converter
public static CxfPayload sourceToCxfPayload(Source src, Exchange exchange) {
List headers = new ArrayList<>();
List body = new ArrayList<>();
body.add(src);
return new CxfPayload<>(headers, body, null);
}
@Converter
public static NodeList cxfPayloadToNodeList(CxfPayload payload, Exchange exchange) {
return new NodeListWrapper(payload.getBody());
}
@Converter
public static Node cxfPayLoadToNode(CxfPayload payload, Exchange exchange) {
List payloadBodyElements = payload.getBody();
if (!payloadBodyElements.isEmpty()) {
return payloadBodyElements.get(0);
}
return null;
}
@Converter
public static Source cxfPayLoadToSource(CxfPayload payload, Exchange exchange) {
List payloadBody = payload.getBodySources();
if (!payloadBody.isEmpty()) {
return payloadBody.get(0);
}
return null;
}
@Converter
public static StreamCache cxfPayLoadToStreamCache(CxfPayload payload, Exchange exchange) {
return new CachedCxfPayload<>(payload, exchange);
}
@SuppressWarnings("unchecked")
@Converter(fallback = true)
public static T convertTo(Class type, Exchange exchange, Object value, TypeConverterRegistry registry) {
// use fallback type converter, so we can probably convert into
// CxfPayloads from other types
if (type.isAssignableFrom(CxfPayload.class)) {
try {
if (!value.getClass().isArray()) {
Source src = null;
// many of the common format that can have a Source created
// directly
if (value instanceof InputStream) {
src = new StreamSource((InputStream) value);
} else if (value instanceof Reader) {
src = new StreamSource((Reader) value);
} else if (value instanceof String) {
src = new StreamSource(new StringReader((String) value));
} else if (value instanceof Node) {
src = new DOMSource((Node) value);
} else if (value instanceof Source) {
src = (Source) value;
}
if (src == null) {
// assuming staxsource is preferred, otherwise use the
// one preferred
TypeConverter tc = registry.lookup(javax.xml.transform.stax.StAXSource.class, value.getClass());
if (tc == null) {
tc = registry.lookup(Source.class, value.getClass());
}
if (tc != null) {
src = tc.convertTo(Source.class, exchange, value);
}
}
if (src != null) {
return (T) sourceToCxfPayload(src, exchange);
}
}
TypeConverter tc = registry.lookup(NodeList.class, value.getClass());
if (tc != null) {
NodeList nodeList = tc.convertTo(NodeList.class, exchange, value);
return (T) nodeListToCxfPayload(nodeList, exchange);
}
tc = registry.lookup(Document.class, value.getClass());
if (tc != null) {
Document document = tc.convertTo(Document.class, exchange, value);
return (T) documentToCxfPayload(document, exchange);
}
// maybe we can convert via an InputStream
CxfPayload p;
p = convertVia(InputStream.class, exchange, value, registry);
if (p != null) {
return (T) p;
}
// String is the converter of last resort
p = convertVia(String.class, exchange, value, registry);
if (p != null) {
return (T) p;
}
} catch (RuntimeCamelException e) {
// the internal conversion to XML can throw an exception if the content is not XML
// ignore this and return MISS_VALUE to indicate that we cannot convert this
return (T) MISS_VALUE;
}
// Let other fallback converter try
return null;
}
// Convert a CxfPayload into something else
if (CxfPayload.class.isAssignableFrom(value.getClass())) {
CxfPayload payload = (CxfPayload) value;
int size = payload.getBodySources().size();
if (size == 1) {
if (type.isAssignableFrom(Document.class)) {
Source s = payload.getBodySources().get(0);
Document d;
try {
d = StaxUtils.read(s);
} catch (XMLStreamException e) {
throw new RuntimeException(e);
}
return type.cast(d);
}
// CAMEL-8410 Just make sure we get the Source object directly from the payload body source
Source s = payload.getBodySources().get(0);
if (type.isInstance(s)) {
return type.cast(s);
}
TypeConverter tc = registry.lookup(type, XMLStreamReader.class);
if (tc != null && (s instanceof StaxSource || s instanceof StAXSource)) {
XMLStreamReader r = (s instanceof StAXSource)
? ((StAXSource) s).getXMLStreamReader() : ((StaxSource) s).getXMLStreamReader();
if (payload.getNsMap() != null) {
r = new DelegatingXMLStreamReader(r, payload.getNsMap());
}
return tc.convertTo(type, exchange, r);
}
tc = registry.lookup(type, Source.class);
if (tc != null) {
XMLStreamReader r = null;
if (payload.getNsMap() != null) {
if (s instanceof StaxSource) {
r = ((StaxSource) s).getXMLStreamReader();
} else if (s instanceof StAXSource) {
r = ((StAXSource) s).getXMLStreamReader();
}
if (r != null) {
s = new StAXSource(new DelegatingXMLStreamReader(r, payload.getNsMap()));
}
}
return tc.convertTo(type, exchange, s);
}
}
TypeConverter tc = registry.lookup(type, NodeList.class);
if (tc != null) {
Object result = tc.convertTo(type, exchange, cxfPayloadToNodeList((CxfPayload) value, exchange));
if (result == null) {
// no we could not do it currently, and we just abort the convert here
return (T) MISS_VALUE;
} else {
return (T) result;
}
}
// we cannot convert a node list, so we try the first item from the
// node list
tc = registry.lookup(type, Node.class);
if (tc != null) {
NodeList nodeList = cxfPayloadToNodeList((CxfPayload) value, exchange);
if (nodeList.getLength() > 0) {
return tc.convertTo(type, exchange, nodeList.item(0));
} else {
// no we could not do it currently
return (T) MISS_VALUE;
}
} else {
if (size == 0) {
// empty size so we cannot convert
return (T) MISS_VALUE;
}
}
}
return null;
}
private static <
T, V> CxfPayload convertVia(Class via, Exchange exchange, Object value, TypeConverterRegistry registry) {
TypeConverter tc = registry.lookup(via, value.getClass());
if (tc != null) {
TypeConverter tc1 = registry.lookup(Document.class, via);
if (tc1 != null) {
V is = tc.convertTo(via, exchange, value);
Document document = tc1.convertTo(Document.class, exchange, is);
return documentToCxfPayload(document, exchange);
}
}
return null;
}
}
