Metacat

import org.dataone.service.types.v1.util.ChecksumUtil;

    // verify checksum, only if we can reset the inputstream

    if (object.markSupported()) {

	    String checksumAlgorithm = sysmeta.getChecksum().getAlgorithm();

	    String checksumValue = sysmeta.getChecksum().getValue();

	    try {

			String computedChecksumValue = ChecksumUtil.checksum(object, checksumAlgorithm).getValue();

			// it's very important that we don't consume the stream

			object.reset();

			if (!computedChecksumValue.equals(checksumValue)) {

				throw new InvalidSystemMetadata("4896", "Checksum given does not match that of the object");

			}

		} catch (Exception e) {

			String msg = "Error verifying checksum values";

	      	logMetacat.error(msg, e);

	        throw new ServiceFailure("1190", msg + ": " + e.getMessage());

		}

    } else {

    	logMetacat.warn("mark is not supported on the object's input stream - cannot verify checksum without consuming stream");

    }