hbase-server/src/test/java/org/apache/hadoop/hbase/util/HBaseHomePath.java

   1 /*
   2  * Licensed to the Apache Software Foundation (ASF) under one or more
   3  * contributor license agreements. See the NOTICE file distributed with this
   4  * work for additional information regarding copyright ownership. The ASF
   5  * licenses this file to you under the Apache License, Version 2.0 (the
   6  * "License"); you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  * http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  13  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  14  * License for the specific language governing permissions and limitations
  15  * under the License.
  16  */
  17 package org.apache.hadoop.hbase.util;
  18
  19 import java.net.URL;
  20
  21 import org.apache.hadoop.hbase.master.HMaster;
  22
  23 /** Determines HBase home path from either class or jar directory */
  24 public class HBaseHomePath {
  25
  26   private static final String TARGET_CLASSES = "/target/classes";
  27   private static final String JAR_SUFFIX = ".jar!";
  28   private static final String FILE_PREFIX = "file:";
  29
  30   private HBaseHomePath() {
  31   }
  32
  33   public static String getHomePath() {
  34     String className = HMaster.class.getName();  // This could have been any HBase class.
  35     String relPathForClass = className.replace(".", "/") + ".class";
  36     URL url = ClassLoader.getSystemResource(relPathForClass);
  37     relPathForClass = "/" + relPathForClass;
  38     if (url == null) {
  39       throw new RuntimeException("Could not lookup class location for " + className);
  40     }
  41
  42     String path = url.getPath();
  43     if (!path.endsWith(relPathForClass)) {
  44       throw new RuntimeException("Got invalid path trying to look up class " + className +
  45           ": " + path);
  46     }
  47     path = path.substring(0, path.length() - relPathForClass.length());
  48
  49     if (path.startsWith(FILE_PREFIX)) {
  50       path = path.substring(FILE_PREFIX.length());
  51     }
  52
  53     if (path.endsWith(TARGET_CLASSES)) {
  54       path = path.substring(0, path.length() - TARGET_CLASSES.length());
  55     } else if (path.endsWith(JAR_SUFFIX)) {
  56       int slashIndex = path.lastIndexOf("/");
  57       if (slashIndex != -1) {
  58         throw new RuntimeException("Expected to find slash in jar path " + path);
  59       }
  60       path = path.substring(0, slashIndex);
  61     } else {
  62       throw new RuntimeException("Cannot identify HBase source directory or installation path " +
  63           "from " + path);
  64     }
  65     return path;
  66   }
  67
  68 }