camel-cmis: Retrieving document passing Metadata from filenet

Question

Since a week i have been trying to create an camel route for following requirement.

1. With Request key, route looks into filenet
2. If there is a document for key in filenet - it will be retrieved and sent to Portal
3. If not - request will be sent to Outside WS, retrieved document will be stored in filenet.
4. For Next same request key, document will be retrieved from filenet based on metadata and sent as response

Below are the 2 interfaces/camel-routes for retreiving from and storing in filenet

Store document

from("activemq:queue:STORE_DOCUMENT_QUEUE")
.process(new Processor() {
    public void process(Exchange exchange) throws Exception {
        exchange.getIn().getHeaders().put(PropertyIds.CONTENT_STREAM_MIME_TYPE, "application/pdf; charset=UTF-8");
        exchange.getIn().getHeaders().put(PropertyIds.NAME, exchange.getIn().getHeader(Exchange.FILE_NAME));
        exchange.getIn().getHeaders().put(CamelCMISConstants.CMIS_FOLDER_PATH, "/TEST");
    }
})
.to("cmis://${header.cmisUrl}");

Retrieve document

from("activemq:queue:RETRIEVE_DOCUMENT_QUEUE")
.setBody(constant("SELECT * FROM cmis:document WHERE cmis:name LIKE '%requestkey%'"))
.to("cmis://${header.cmisUrl}")
.split(body())
.process(new Processor() {
    public void process(Exchange exchange) throws Exception {
        Map<String, Object> body = (Map<String, Object>)exchange.getIn().getBody();
        exchange.getIn().getHeaders().put(Exchange.FILE_NAME, body.get(PropertyIds.NAME));
        exchange.getIn().setBody(body.get(CamelCMISConstants.CAMEL_CMIS_CONTENT_STREAM));
    }
})
.to("file:src/test");

In above routes, there is no/very less metadata information... If i need to search for document by metadata or store to filenet a doc using metadata as key. Example : Store a document with following key as metadata and retrieving using same 1. Identity Number 2. Type of Document 3. Receipt Date

Can somebody give me a knowledge of setting metadata in camel exchange or using metadata for storing and retreival of document ??