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Common functionality for HBase
/*
* 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.hadoop.hbase.util;
import java.io.PrintStream;
import java.io.PrintWriter;
import org.apache.hadoop.hbase.Version;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class finds the Version information for HBase.
*/
@InterfaceAudience.Public
public class VersionInfo {
private static final Logger LOG = LoggerFactory.getLogger(VersionInfo.class.getName());
// If between two dots there is not a number, we regard it as a very large number so it is
// higher than any numbers in the version.
private static final int VERY_LARGE_NUMBER = 100000;
/**
* Get the hbase version.
* @return the hbase version string, eg. "0.6.3-dev"
*/
public static String getVersion() {
return Version.version;
}
/**
* Get the subversion revision number for the root directory
* @return the revision number, eg. "451451"
*/
public static String getRevision() {
return Version.revision;
}
/**
* The date that hbase was compiled.
* @return the compilation date in unix date format
*/
public static String getDate() {
return Version.date;
}
/**
* The user that compiled hbase.
* @return the username of the user
*/
public static String getUser() {
return Version.user;
}
/**
* Get the subversion URL for the root hbase directory.
* @return the url
*/
public static String getUrl() {
return Version.url;
}
static String[] versionReport() {
return new String[] {
"HBase " + getVersion(),
"Source code repository " + getUrl() + " revision=" + getRevision(),
"Compiled by " + getUser() + " on " + getDate(),
"From source with checksum " + getSrcChecksum()
};
}
/**
* Get the checksum of the source files from which Hadoop was compiled.
* @return a string that uniquely identifies the source
**/
public static String getSrcChecksum() {
return Version.srcChecksum;
}
public static void writeTo(PrintWriter out) {
for (String line : versionReport()) {
out.println(line);
}
}
public static void writeTo(PrintStream out) {
for (String line : versionReport()) {
out.println(line);
}
}
public static void logVersion() {
for (String line : versionReport()) {
LOG.info(line);
}
}
public static int compareVersion(String v1, String v2) {
//fast compare equals first
if (v1.equals(v2)) {
return 0;
}
Object[] v1Comps = getVersionComponents(v1); //1.2.3-hotfix -> [1, 2, 3, hotfix]
Object[] v2Comps = getVersionComponents(v2);
int index = 0;
while (index < v1Comps.length && index < v2Comps.length) {
int va = v1Comps[index] instanceof Integer ? (Integer)v1Comps[index] : VERY_LARGE_NUMBER;
int vb = v2Comps[index] instanceof Integer ? (Integer)v2Comps[index] : VERY_LARGE_NUMBER;
if (va != vb) {
return va - vb;
}
if (va == VERY_LARGE_NUMBER) {
// here, va and vb components must be same and Strings, compare as String
int c = ((String)v1Comps[index]).compareTo((String)v2Comps[index]);
if (c != 0) {
return c;
}
}
index++;
}
if (index < v1Comps.length) {
// v1 is longer
return 1;
}
//v2 is longer
return -1;
}
/**
* Returns the version components as Integer and String objects
* Examples: "1.2.3" returns [1, 2, 3], "4.5.6-SNAPSHOT" returns [4, 5, 6, "SNAPSHOT"]
* @return the components of the version string
*/
static Object[] getVersionComponents(final String version) {
assert(version != null);
Object[] strComps = version.split("[\\.-]");
assert(strComps.length > 0);
Object[] comps = new Object[strComps.length];
for (int i = 0; i < strComps.length; ++i) {
try {
comps[i] = Integer.parseInt((String) strComps[i]);
} catch (NumberFormatException e) {
comps[i] = strComps[i];
}
}
return comps;
}
public static void main(String[] args) {
writeTo(System.out);
}
}