tikhomirov@384: /*
tikhomirov@384:  * Copyright (c) 2012 TMate Software Ltd
tikhomirov@384:  *  
tikhomirov@384:  * This program is free software; you can redistribute it and/or modify
tikhomirov@384:  * it under the terms of the GNU General Public License as published by
tikhomirov@384:  * the Free Software Foundation; version 2 of the License.
tikhomirov@384:  *
tikhomirov@384:  * This program is distributed in the hope that it will be useful,
tikhomirov@384:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@384:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@384:  * GNU General Public License for more details.
tikhomirov@384:  *
tikhomirov@384:  * For information on how to redistribute this software under
tikhomirov@384:  * the terms of a license other than GNU General Public License
tikhomirov@384:  * contact TMate Software at support@hg4j.com
tikhomirov@384:  */
tikhomirov@538: package org.tmatesoft.hg.internal;
tikhomirov@384: 
tikhomirov@384: import java.io.ByteArrayOutputStream;
tikhomirov@384: 
tikhomirov@618: import org.tmatesoft.hg.core.HgIOException;
tikhomirov@384: import org.tmatesoft.hg.core.Nodeid;
tikhomirov@618: import org.tmatesoft.hg.internal.DataSerializer.DataSource;
tikhomirov@384: 
tikhomirov@384: /**
tikhomirov@384:  * Create binary manifest entry ready to write down into 00manifest.i
tikhomirov@384:  * <p>Usage:
tikhomirov@384:  * <pre>
tikhomirov@384:  *   ManifestEntryBuilder mb = new ManifestEntryBuilder();
tikhomirov@384:  *   mb.reset().add("file1", file1.getRevision(r1));
tikhomirov@384:  *   mb.add("file2", file2.getRevision(r2));
tikhomirov@384:  *   byte[] manifestRecordData = mb.build();
tikhomirov@384:  *   byte[] manifestRevlogHeader = buildRevlogHeader(..., sha1(parents, manifestRecordData), manifestRecordData.length);
tikhomirov@384:  *   manifestIndexOutputStream.write(manifestRevlogHeader);
tikhomirov@384:  *   manifestIndexOutputStream.write(manifestRecordData);
tikhomirov@384:  * </pre>
tikhomirov@384:  * 
tikhomirov@384:  * @author Artem Tikhomirov
tikhomirov@384:  * @author TMate Software Ltd.
tikhomirov@384:  */
tikhomirov@618: public class ManifestEntryBuilder implements DataSource {
tikhomirov@618: 	private final ByteArrayOutputStream buffer = new ByteArrayOutputStream();
tikhomirov@618: 	private final EncodingHelper encHelper;
tikhomirov@384: 
tikhomirov@618: 	public ManifestEntryBuilder(EncodingHelper encodingHelper) {
tikhomirov@618: 		encHelper = encodingHelper;
tikhomirov@618: 	}
tikhomirov@384: 	
tikhomirov@384: 	public ManifestEntryBuilder reset() {
tikhomirov@384: 		buffer.reset();
tikhomirov@384: 		return this;
tikhomirov@384: 	}
tikhomirov@384: 	public ManifestEntryBuilder add(String fname, Nodeid revision) {
tikhomirov@618: 		byte[] b = encHelper.toManifest(fname);
tikhomirov@384: 		buffer.write(b, 0, b.length);
tikhomirov@384: 		buffer.write('\0');
tikhomirov@384: 		b = revision.toString().getBytes();
tikhomirov@384: 		buffer.write(b, 0, b.length);
tikhomirov@384: 		buffer.write('\n');
tikhomirov@384: 		return this;
tikhomirov@384: 	}
tikhomirov@384: 
tikhomirov@384: 	public byte[] build() {
tikhomirov@384: 		return buffer.toByteArray();
tikhomirov@384: 	}
tikhomirov@384: 
tikhomirov@618: 	public void serialize(DataSerializer out) throws HgIOException {
tikhomirov@618: 		byte[] r = build();
tikhomirov@618: 		out.write(r, 0 , r.length);
tikhomirov@618: 	}
tikhomirov@618: 
tikhomirov@618: 	public int serializeLength() {
tikhomirov@618: 		return buffer.size();
tikhomirov@618: 	}
tikhomirov@618: 
tikhomirov@384: }