/**
* 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.converter.jaxb;
import java.io.Closeable;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.util.HashMap;
import java.util.Map;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.stream.FactoryConfigurationError;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.transform.Source;
import org.apache.camel.Exchange;
import org.apache.camel.NoTypeConversionAvailableException;
import org.apache.camel.Processor;
import org.apache.camel.StreamCache;
import org.apache.camel.TypeConversionException;
import org.apache.camel.TypeConverter;
import org.apache.camel.component.bean.BeanInvocation;
import org.apache.camel.converter.jaxp.StaxConverter;
import org.apache.camel.spi.TypeConverterAware;
import org.apache.camel.support.ServiceSupport;
import org.apache.camel.util.IOHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @version
*/
public class FallbackTypeConverter extends ServiceSupport implements TypeConverter, TypeConverterAware {
public static final String PRETTY_PRINT = "CamelJaxbPrettyPrint";
private static final transient Logger LOG = LoggerFactory.getLogger(FallbackTypeConverter.class);
private final Map<Class<?>, JAXBContext> contexts = new HashMap<Class<?>, JAXBContext>();
private final StaxConverter staxConverter = new StaxConverter();
private TypeConverter parentTypeConverter;
private boolean prettyPrint = true;
public boolean isPrettyPrint() {
return prettyPrint;
}
public void setPrettyPrint(boolean prettyPrint) {
this.prettyPrint = prettyPrint;
}
public boolean allowNull() {
return false;
}
public void setTypeConverter(TypeConverter parentTypeConverter) {
this.parentTypeConverter = parentTypeConverter;
}
public <T> T convertTo(Class<T> type, Object value) {
return convertTo(type, null, value);
}
public <T> T convertTo(Class<T> type, Exchange exchange, Object value) {
if (BeanInvocation.class.isAssignableFrom(type) || Processor.class.isAssignableFrom(type)) {
// JAXB cannot convert to a BeanInvocation / Processor, so we need to indicate this
// to avoid Camel trying to do this when using beans with JAXB payloads
return null;
}
try {
if (isJaxbType(type)) {
return unmarshall(type, exchange, value);
}
if (value != null) {
if (isJaxbType(value.getClass()) && isNotStreamCacheType(type)) {
return marshall(type, exchange, value);
}
}
} catch (Exception e) {
throw new TypeConversionException(value, type, e);
}
// should return null if didn't even try to convert at all or for whatever reason the conversion is failed
return null;
}
public <T> T mandatoryConvertTo(Class<T> type, Object value) throws NoTypeConversionAvailableException {
return mandatoryConvertTo(type, null, value);
}
public <T> T mandatoryConvertTo(Class<T> type, Exchange exchange, Object value) throws NoTypeConversionAvailableException {
T answer = convertTo(type, exchange, value);
if (answer == null) {
throw new NoTypeConversionAvailableException(value, type);
}
return answer;
}
public <T> T tryConvertTo(Class<T> type, Object value) {
try {
return convertTo(type, null, value);
} catch (Exception e) {
return null;
}
}
public <T> T tryConvertTo(Class<T> type, Exchange exchange, Object value) {
try {
return convertTo(type, exchange, value);
} catch (Exception e) {
return null;
}
}
@Override
protected void doStart() throws Exception {
// noop
}
@Override
protected void doStop() throws Exception {
contexts.clear();
}
protected <T> boolean isJaxbType(Class<T> type) {
XmlRootElement element = type.getAnnotation(XmlRootElement.class);
return element != null;
}
/**
* Lets try parse via JAXB
*/
protected <T> T unmarshall(Class<T> type, Exchange exchange, Object value) throws Exception {
LOG.trace("Unmarshal to {} with value {}", type, value);
if (value == null) {
throw new IllegalArgumentException("Cannot convert from null value to JAXBSource");
}
Unmarshaller unmarshaller = getUnmarshaller(type);
if (parentTypeConverter != null) {
if (!needFiltering(exchange)) {
// we cannot filter the XMLStreamReader if necessary
XMLStreamReader xmlReader = parentTypeConverter.convertTo(XMLStreamReader.class, exchange, value);
if (xmlReader != null) {
try {
Object unmarshalled = unmarshal(unmarshaller, exchange, xmlReader);
return type.cast(unmarshalled);
} catch (Exception ex) {
// There is some issue on the StaxStreamReader to CXFPayload message body with different namespaces
LOG.debug("Cannot use StaxStreamReader to unmarshal the message, due to {}", ex);
}
}
}
InputStream inputStream = parentTypeConverter.convertTo(InputStream.class, exchange, value);
if (inputStream != null) {
Object unmarshalled = unmarshal(unmarshaller, exchange, inputStream);
return type.cast(unmarshalled);
}
Reader reader = parentTypeConverter.convertTo(Reader.class, exchange, value);
if (reader != null) {
Object unmarshalled = unmarshal(unmarshaller, exchange, reader);
return type.cast(unmarshalled);
}
Source source = parentTypeConverter.convertTo(Source.class, exchange, value);
if (source != null) {
Object unmarshalled = unmarshal(unmarshaller, exchange, source);
return type.cast(unmarshalled);
}
}
if (value instanceof String) {
value = new StringReader((String) value);
}
if (value instanceof InputStream || value instanceof Reader) {
Object unmarshalled = unmarshal(unmarshaller, exchange, value);
return type.cast(unmarshalled);
}
return null;
}
protected <T> T marshall(Class<T> type, Exchange exchange, Object value)
throws JAXBException, XMLStreamException, FactoryConfigurationError, TypeConversionException {
LOG.trace("Marshal from value {} to type {}", value, type);
T answer = null;
if (parentTypeConverter != null) {
// lets convert the object to a JAXB source and try convert that to
// the required source
JAXBContext context = createContext(value.getClass());
// must create a new instance of marshaller as its not thread safe
Marshaller marshaller = context.createMarshaller();
Writer buffer = new StringWriter();
boolean prettyPrint = isPrettyPrint();
// check the camel context property to decide the value of PrettyPrint
if (exchange != null) {
String property = exchange.getContext().getProperty(PRETTY_PRINT);
if (property != null) {
if (property.equalsIgnoreCase("false")) {
prettyPrint = false;
} else {
prettyPrint = true;
}
}
}
if (prettyPrint) {
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
}
if (exchange != null && exchange.getProperty(Exchange.CHARSET_NAME, String.class) != null) {
marshaller.setProperty(Marshaller.JAXB_ENCODING, exchange.getProperty(Exchange.CHARSET_NAME, String.class));
}
if (needFiltering(exchange)) {
XMLStreamWriter writer = parentTypeConverter.convertTo(XMLStreamWriter.class, buffer);
FilteringXmlStreamWriter filteringWriter = new FilteringXmlStreamWriter(writer);
marshaller.marshal(value, filteringWriter);
} else {
marshaller.marshal(value, buffer);
}
// we need to pass the exchange
answer = parentTypeConverter.convertTo(type, exchange, buffer.toString());
}
return answer;
}
protected Object unmarshal(Unmarshaller unmarshaller, Exchange exchange, Object value)
throws JAXBException, UnsupportedEncodingException, XMLStreamException {
try {
XMLStreamReader xmlReader;
if (value instanceof XMLStreamReader) {
xmlReader = (XMLStreamReader) value;
} else if (value instanceof InputStream) {
if (needFiltering(exchange)) {
xmlReader = staxConverter.createXMLStreamReader(new NonXmlFilterReader(new InputStreamReader((InputStream)value, IOHelper.getCharsetName(exchange))));
} else {
xmlReader = staxConverter.createXMLStreamReader((InputStream)value, exchange);
}
} else if (value instanceof Reader) {
Reader reader = (Reader)value;
if (needFiltering(exchange)) {
if (!(value instanceof NonXmlFilterReader)) {
reader = new NonXmlFilterReader((Reader)value);
}
}
xmlReader = staxConverter.createXMLStreamReader(reader);
} else if (value instanceof Source) {
xmlReader = staxConverter.createXMLStreamReader((Source)value);
} else {
throw new IllegalArgumentException("Cannot convert from " + value.getClass());
}
return unmarshaller.unmarshal(xmlReader);
} finally {
if (value instanceof Closeable) {
IOHelper.close((Closeable)value, "Unmarshalling", LOG);
}
}
}
protected boolean needFiltering(Exchange exchange) {
// exchange property takes precedence over data format property
return exchange != null && exchange.getProperty(Exchange.FILTER_NON_XML_CHARS, Boolean.FALSE, Boolean.class);
}
protected synchronized <T> JAXBContext createContext(Class<T> type) throws JAXBException {
JAXBContext context = contexts.get(type);
if (context == null) {
context = JAXBContext.newInstance(type);
contexts.put(type, context);
}
return context;
}
protected <T> Unmarshaller getUnmarshaller(Class<T> type) throws JAXBException {
JAXBContext context = createContext(type);
return context.createUnmarshaller();
}
private static <T> boolean isNotStreamCacheType(Class<T> type) {
return !StreamCache.class.isAssignableFrom(type);
}
}