Mercurial > jhg
view src/org/tmatesoft/hg/internal/RevlogDelegate.java @ 703:7839ff0bfd78
Refactor: move diff/blame related code to a separate package
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Wed, 14 Aug 2013 14:51:51 +0200 (2013-08-14) |
parents | 053bb4397bf9 |
children |
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/* * Copyright (c) 2013 TMate Software Ltd * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * For information on how to redistribute this software under * the terms of a license other than GNU General Public License * contact TMate Software at support@hg4j.com */ package org.tmatesoft.hg.internal; import org.tmatesoft.hg.core.Nodeid; import org.tmatesoft.hg.internal.RevlogStream.Inspector; import org.tmatesoft.hg.repo.HgRepository; import org.tmatesoft.hg.repo.HgRuntimeException; /** * Does almost nothing, facilitates chains of inspectors and sharing certain information between them * * @author Artem Tikhomirov * @author TMate Software Ltd. */ public abstract class RevlogDelegate implements RevlogStream.Inspector { private final Inspector next; private Nodeid nid; private final RevlogDelegate nextAsRD; protected RevlogDelegate(RevlogStream.Inspector nextInChain) { next = nextInChain; if (nextInChain instanceof RevlogDelegate) { // additional benefits nextAsRD = (RevlogDelegate) nextInChain; } else { nextAsRD = null; } } /** * iterates index only and ensures pre/post processing is invoked for the chain */ public void walk(HgRepository hgRepo, RevlogStream stream, int from, int to) { // hgRepo is handy for present uses, but is generally not appropriate, // it's ok to refactor and let subclasses get what they need through e.g. a cons stream.iterate(from, to, false, this); postWalk(hgRepo); } // does nothing but gives a chance to delegate to handle the same protected void postWalk(HgRepository hgRepo) { if (nextAsRD != null) { nextAsRD.postWalk(hgRepo); } } /** * @return Nodeid of current revision if already known, or a new instance otherwise. * The value will propagate to subsequent {@link RevlogDelegate RevlogDelegates}, if any */ protected Nodeid getRevision(byte[] nodeid) { if (nid == null) { nid = Nodeid.fromBinary(nodeid, 0); } return nid; } protected void setRevision(Nodeid nodeid) { nid = nodeid; } public void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) throws HgRuntimeException { if (next != null) { if (nextAsRD != null) { nextAsRD.setRevision(nid); // null is fine } next.next(revisionIndex, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeid, data); } nid = null; // forget it, get ready for the next iteration } }