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

import java.io.*;

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

/**
 * Response handler for {@link Throwable} objects.
 *
 * <p>
 * Adds a <c>Thrown</c> header to the response and returns <c>0</c> so that the processor chain can continue.
 *
 * <ul class='seealso'>
 * 	<li class='link'>{@doc jrs.ResponseProcessors}
 * 	<li class='extlink'>{@source}
 * </ul>
 */
public final class ThrowableProcessor implements ResponseProcessor {

	@Override /* ResponseProcessor */
	public int process(RestOpSession opSession) throws IOException {

		RestResponse res = opSession.getResponse();
		Throwable t = res.getContent(Throwable.class);

		if (t == null)
			return NEXT;

		res.addHeader(Thrown.of(t));

		return NEXT; // Continue processing as bean.
	}
}

