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/*******************************************************************************
* Copyright (c) 2018, 2018 Mykola Nikishov.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Mykola Nikishov - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.artifact.processors.checksum;
import java.io.IOException;
import java.nio.BufferOverflowException;
import java.nio.ByteBuffer;
import java.security.MessageDigest;
import org.eclipse.equinox.internal.p2.repository.helpers.ChecksumHelper;
import org.eclipse.equinox.internal.provisional.p2.artifact.repository.processing.ProcessingStep;
/**
* @noreference This class is not intended to be referenced by clients.
*/
public abstract class MessageDigestProcessingStep extends ProcessingStep {
protected MessageDigest messageDigest;
private static final int BUFFER_SIZE = 16 * 1024;
private ByteBuffer buffer = ByteBuffer.allocate(BUFFER_SIZE);
@Override
// TODO template method, should be final but MD5Verifier prevents this
public void write(int b) throws IOException {
getDestination().write(b);
// TODO exceptions are expensive
try {
buffer.put((byte) b);
} catch (BufferOverflowException e) {
processBufferredBytes();
buffer.put((byte) b);
}
}
private void processBufferredBytes() {
buffer.flip();
updateDigest();
buffer.clear();
}
private void updateDigest() {
messageDigest.update(buffer);
}
@Override
// TODO should be final but MD5Verifier prevents this
public void close() throws IOException {
processBufferredBytes();
String digestString = digest();
onClose(digestString);
super.close();
}
private String digest() {
byte[] digestBytes = messageDigest.digest();
return ChecksumHelper.toHexString(digestBytes);
}
protected abstract void onClose(String digestString);
}
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