/**
* Creates a dynamic context for the given exchange
*/
protected DynamicQueryContext createDynamicContext(Exchange exchange) throws Exception {
Configuration config = getConfiguration();
DynamicQueryContext dynamicQueryContext = new DynamicQueryContext(config);
Message in = exchange.getIn();
Item item = in.getBody(Item.class);
if (item != null) {
dynamicQueryContext.setContextItem(item);
} else {
Object body = in.getBody();
// the underlying input stream, which we need to close to avoid locking files or other resources
InputStream is = null;
try {
Source source;
// only convert to input stream if really needed
if (isInputStreamNeeded(exchange)) {
is = exchange.getIn().getBody(InputStream.class);
source = getSource(exchange, is);
} else {
source = getSource(exchange, body);
}
// special for bean invocation
if (source == null) {
if (body instanceof BeanInvocation) {
// if its a null bean invocation then handle that
BeanInvocation bi = exchange.getContext().getTypeConverter().convertTo(BeanInvocation.class, body);
if (bi.getArgs() != null && bi.getArgs().length == 1 && bi.getArgs()[0] == null) {
// its a null argument from the bean invocation so use null as answer
source = null;
}
}
}
if (source == null) {
// indicate it was not possible to convert to a Source type
throw new NoTypeConversionAvailableException(body, Source.class);
}
DocumentInfo doc = config.buildDocument(source);
dynamicQueryContext.setContextItem(doc);
} finally {
// can deal if is is null
IOHelper.close(is);
}