| /* |
| * Copyright (C) 2015, Google Inc. and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| package org.eclipse.jgit.internal.storage.file; |
| |
| import static java.nio.charset.StandardCharsets.UTF_8; |
| |
| import java.io.BufferedReader; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.io.Reader; |
| |
| import org.eclipse.jgit.lib.AnyObjectId; |
| import org.eclipse.jgit.lib.MutableObjectId; |
| import org.eclipse.jgit.lib.ObjectIdOwnerMap; |
| import org.eclipse.jgit.lib.ObjectIdSet; |
| |
| /** |
| * Lazily loads a set of ObjectIds, one per line. |
| */ |
| public class LazyObjectIdSetFile implements ObjectIdSet { |
| private final File src; |
| private ObjectIdOwnerMap<Entry> set; |
| |
| /** |
| * Create a new lazy set from a file. |
| * |
| * @param src |
| * the source file. |
| */ |
| public LazyObjectIdSetFile(File src) { |
| this.src = src; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean contains(AnyObjectId objectId) { |
| if (set == null) { |
| set = load(); |
| } |
| return set.contains(objectId); |
| } |
| |
| private ObjectIdOwnerMap<Entry> load() { |
| ObjectIdOwnerMap<Entry> r = new ObjectIdOwnerMap<>(); |
| try (FileInputStream fin = new FileInputStream(src); |
| Reader rin = new InputStreamReader(fin, UTF_8); |
| BufferedReader br = new BufferedReader(rin)) { |
| MutableObjectId id = new MutableObjectId(); |
| for (String line; (line = br.readLine()) != null;) { |
| id.fromString(line); |
| if (!r.contains(id)) { |
| r.add(new Entry(id)); |
| } |
| } |
| } catch (IOException e) { |
| // Ignore IO errors accessing the lazy set. |
| } |
| return r; |
| } |
| |
| static class Entry extends ObjectIdOwnerMap.Entry { |
| Entry(AnyObjectId id) { |
| super(id); |
| } |
| } |
| } |