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// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
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package org.apache.juneau.rest.processor;

import static org.apache.juneau.internal.StringUtils.*;

import java.io.*;

import org.apache.juneau.rest.*;
import org.apache.juneau.rest.util.*;
import org.apache.juneau.http.header.*;
import org.apache.juneau.http.response.*;

/**
 * Response handler for plain-old Java objects when a serializer match is not found and they're asking for plain/text or anything.
 *
 * <ul class='seealso'>
 * 	<li class='link'>{@doc jrs.ResponseProcessors}
 * 	<li class='extlink'>{@source}
 * </ul>
 */
public final class PlainTextPojoProcessor implements ResponseProcessor {

	@Override /* ResponseProcessor */
	public int process(RestOpSession opSession) throws IOException, NotAcceptable, BasicHttpException {
		RestRequest req = opSession.getRequest();
		RestResponse res = opSession.getResponse();
		String accept = req.getHeader("Accept").orElse("*/*");

		if (res.getSerializerMatch().isPresent() || ! (isEmpty(accept) || accept.startsWith("text/plain") || accept.contains("*/*")))
			return NEXT;

		Object o = res.getContent(Object.class);

		if (isEmpty(res.getContentType()))
			res.setHeader(ContentType.TEXT_PLAIN);

		FinishablePrintWriter w = res.getNegotiatedWriter();
		if (o == null)
			w.append("null");
		else
			w.append(req.getBeanSession().getClassMetaForObject(o).toString(o));
		w.flush();
		w.finish();

		return FINISHED;
	}
}

