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- /*
- * Copyright (C) 2011, 2013 Google Inc., and others.
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.internal.storage.dfs;
-
- import static org.eclipse.jgit.internal.storage.pack.PackExt.PACK;
-
- import java.util.HashMap;
- import java.util.Map;
-
- import org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource;
- import org.eclipse.jgit.internal.storage.pack.PackExt;
- import org.eclipse.jgit.storage.pack.PackStatistics;
-
- /**
- * Description of a DFS stored pack/index file.
- * <p>
- * Implementors may extend this class and add additional data members.
- * <p>
- * Instances of this class are cached with the DfsPackFile, and should not be
- * modified once initialized and presented to the JGit DFS library.
- */
- public class DfsPackDescription implements Comparable<DfsPackDescription> {
- private final DfsRepositoryDescription repoDesc;
-
- private final String packName;
-
- private PackSource packSource;
-
- private long lastModified;
-
- private final Map<PackExt, Long> sizeMap;
-
- private long objectCount;
-
- private long deltaCount;
-
- private PackStatistics stats;
-
- private int extensions;
-
- private int indexVersion;
-
- /**
- * Initialize a description by pack name and repository.
- * <p>
- * The corresponding index file is assumed to exist. If this is not true
- * implementors must extend the class and override
- * {@link #getFileName(PackExt)}.
- * <p>
- * Callers should also try to fill in other fields if they are reasonably
- * free to access at the time this instance is being initialized.
- *
- * @param name
- * name of the pack file. Must end with ".pack".
- * @param repoDesc
- * description of the repo containing the pack file.
- */
- public DfsPackDescription(DfsRepositoryDescription repoDesc, String name) {
- this.repoDesc = repoDesc;
- int dot = name.lastIndexOf('.');
- this.packName = (dot < 0) ? name : name.substring(0, dot);
- this.sizeMap = new HashMap<PackExt, Long>(PackExt.values().length * 2);
- }
-
- /** @return description of the repository. */
- public DfsRepositoryDescription getRepositoryDescription() {
- return repoDesc;
- }
-
- /**
- * Adds the pack file extension to the known list.
- *
- * @param ext
- * the file extension
- */
- public void addFileExt(PackExt ext) {
- extensions |= ext.getBit();
- }
-
- /**
- * @param ext
- * the file extension
- * @return whether the pack file extensions is known to exist.
- */
- public boolean hasFileExt(PackExt ext) {
- return (extensions & ext.getBit()) != 0;
- }
-
- /**
- * @param ext
- * the file extension
- * @return name of the file.
- */
- public String getFileName(PackExt ext) {
- return packName + '.' + ext.getExtension();
- }
-
- /** @return the source of the pack. */
- public PackSource getPackSource() {
- return packSource;
- }
-
- /**
- * @param source
- * the source of the pack.
- * @return {@code this}
- */
- public DfsPackDescription setPackSource(PackSource source) {
- packSource = source;
- return this;
- }
-
- /** @return time the pack was created, in milliseconds. */
- public long getLastModified() {
- return lastModified;
- }
-
- /**
- * @param timeMillis
- * time the pack was created, in milliseconds. 0 if not known.
- * @return {@code this}
- */
- public DfsPackDescription setLastModified(long timeMillis) {
- lastModified = timeMillis;
- return this;
- }
-
- /**
- * @param ext
- * the file extension.
- * @param bytes
- * size of the file in bytes. If 0 the file is not known and will
- * be determined on first read.
- * @return {@code this}
- */
- public DfsPackDescription setFileSize(PackExt ext, long bytes) {
- sizeMap.put(ext, Long.valueOf(Math.max(0, bytes)));
- return this;
- }
-
- /**
- * @param ext
- * the file extension.
- * @return size of the file, in bytes. If 0 the file size is not yet known.
- */
- public long getFileSize(PackExt ext) {
- Long size = sizeMap.get(ext);
- return size == null ? 0 : size.longValue();
- }
-
- /** @return number of objects in the pack. */
- public long getObjectCount() {
- return objectCount;
- }
-
- /**
- * @param cnt
- * number of objects in the pack.
- * @return {@code this}
- */
- public DfsPackDescription setObjectCount(long cnt) {
- objectCount = Math.max(0, cnt);
- return this;
- }
-
- /** @return number of delta compressed objects in the pack. */
- public long getDeltaCount() {
- return deltaCount;
- }
-
- /**
- * @param cnt
- * number of delta compressed objects in the pack.
- * @return {@code this}
- */
- public DfsPackDescription setDeltaCount(long cnt) {
- deltaCount = Math.max(0, cnt);
- return this;
- }
-
- /**
- * @return statistics from PackWriter, if the pack was built with it.
- * Generally this is only available for packs created by
- * DfsGarbageCollector or DfsPackCompactor, and only when the pack
- * is being committed to the repository.
- */
- public PackStatistics getPackStats() {
- return stats;
- }
-
- DfsPackDescription setPackStats(PackStatistics stats) {
- this.stats = stats;
- setFileSize(PACK, stats.getTotalBytes());
- setObjectCount(stats.getTotalObjects());
- setDeltaCount(stats.getTotalDeltas());
- return this;
- }
-
- /**
- * Discard the pack statistics, if it was populated.
- *
- * @return {@code this}
- */
- public DfsPackDescription clearPackStats() {
- stats = null;
- return this;
- }
-
- /** @return the version of the index file written. */
- public int getIndexVersion() {
- return indexVersion;
- }
-
- /**
- * @param version
- * the version of the index file written.
- * @return {@code this}
- */
- public DfsPackDescription setIndexVersion(int version) {
- indexVersion = version;
- return this;
- }
-
- @Override
- public int hashCode() {
- return packName.hashCode();
- }
-
- @Override
- public boolean equals(Object b) {
- if (b instanceof DfsPackDescription) {
- DfsPackDescription desc = (DfsPackDescription) b;
- return packName.equals(desc.packName) &&
- getRepositoryDescription().equals(desc.getRepositoryDescription());
- }
- return false;
- }
-
- /**
- * Sort packs according to the optimal lookup ordering.
- * <p>
- * This method tries to position packs in the order readers should examine
- * them when looking for objects by SHA-1. The default tries to sort packs
- * with more recent modification dates before older packs, and packs with
- * fewer objects before packs with more objects.
- *
- * @param b
- * the other pack.
- */
- public int compareTo(DfsPackDescription b) {
- // Cluster by PackSource, pushing UNREACHABLE_GARBAGE to the end.
- PackSource as = getPackSource();
- PackSource bs = b.getPackSource();
- if (as != null && bs != null) {
- int cmp = as.category - bs.category;
- if (cmp != 0)
- return cmp;
- }
-
- // Newer packs should sort first.
- int cmp = Long.signum(b.getLastModified() - getLastModified());
- if (cmp != 0)
- return cmp;
-
- // Break ties on smaller index. Readers may get lucky and find
- // the object they care about in the smaller index. This also pushes
- // big historical packs to the end of the list, due to more objects.
- return Long.signum(getObjectCount() - b.getObjectCount());
- }
-
- @Override
- public String toString() {
- return getFileName(PackExt.PACK);
- }
- }
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