| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.jackrabbit.oak.segment.tool; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static org.apache.jackrabbit.oak.segment.tool.Utils.readRevisions; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| import java.util.List; |
| |
| /** |
| * Collect and print the revisions of a segment store. |
| */ |
| public class Revisions { |
| |
| /** |
| * Create a builder for the {@link Revisions} command. |
| * |
| * @return an instance of {@link Builder}. |
| */ |
| public static Builder builder() { |
| return new Builder(); |
| } |
| |
| /** |
| * Collect options for the {@link Revisions} command. |
| */ |
| public static class Builder { |
| |
| private File path; |
| |
| private File out; |
| |
| private Builder() { |
| // Prevent external instantiation. |
| } |
| |
| /** |
| * The path to an existing segment store. This parameter is required. |
| * |
| * @param path the path to an existing segment store. |
| * @return this builder. |
| */ |
| public Builder withPath(File path) { |
| this.path = checkNotNull(path); |
| return this; |
| } |
| |
| /** |
| * The file where the output of this command is stored. this parameter |
| * is mandatory. |
| * |
| * @param out the output file. |
| * @return this builder. |
| */ |
| public Builder withOutput(File out) { |
| this.out = checkNotNull(out); |
| return this; |
| } |
| |
| /** |
| * Create an executable version of the {@link Revisions} command. |
| * |
| * @return an instance of {@link Runnable}. |
| */ |
| public Revisions build() { |
| checkNotNull(path); |
| checkNotNull(out); |
| return new Revisions(this); |
| } |
| |
| } |
| |
| private final File path; |
| |
| private final File out; |
| |
| private Revisions(Builder builder) { |
| this.path = builder.path; |
| this.out = builder.out; |
| } |
| |
| public int run() { |
| try { |
| listRevisions(); |
| return 0; |
| } catch (Exception e) { |
| e.printStackTrace(System.err); |
| return 1; |
| } |
| } |
| |
| private void listRevisions() throws IOException { |
| System.out.println("Store " + path); |
| System.out.println("Writing revisions to " + out); |
| |
| List<String> revs = readRevisions(path); |
| |
| if (revs.isEmpty()) { |
| System.out.println("No revisions found."); |
| return; |
| } |
| |
| try (PrintWriter pw = new PrintWriter(out)) { |
| for (String r : revs) { |
| pw.println(r); |
| } |
| } |
| } |
| |
| } |