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Hive JDBC driver from Arenadata
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/*
* 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.hive.jdbc;
import java.io.IOException;
import java.net.URL;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverPropertyInfo;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.util.Properties;
import java.util.jar.Attributes;
import java.util.jar.Manifest;
import java.util.logging.Logger;
import java.util.regex.Pattern;
import org.apache.hive.jdbc.Utils.JdbcConnectionParams;
/**
* HiveDriver.
*
*/
public class HiveDriver implements Driver {
static {
try {
java.sql.DriverManager.registerDriver(new HiveDriver());
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* Is this driver JDBC compliant?
*/
private static final boolean JDBC_COMPLIANT = false;
/**
* Property key for the database name.
*/
private static final String DBNAME_PROPERTY_KEY = "DBNAME";
/**
* Property key for the Hive Server2 host.
*/
private static final String HOST_PROPERTY_KEY = "HOST";
/**
* Property key for the Hive Server2 port.
*/
private static final String PORT_PROPERTY_KEY = "PORT";
/**
*
*/
public HiveDriver() {
// TODO Auto-generated constructor stub
SecurityManager security = System.getSecurityManager();
if (security != null) {
security.checkWrite("foobah");
}
}
/**
* Checks whether a given url is in a valid format.
*
* The current uri format is: jdbc:hive://[host[:port]]
*
* jdbc:hive:// - run in embedded mode jdbc:hive://localhost - connect to
* localhost default port (10000) jdbc:hive://localhost:5050 - connect to
* localhost port 5050
*
* TODO: - write a better regex. - decide on uri format
*/
@Override
public boolean acceptsURL(String url) throws SQLException {
return Pattern.matches(Utils.URL_PREFIX + ".*", url);
}
/*
* As per JDBC 3.0 Spec (section 9.2)
* "If the Driver implementation understands the URL, it will return a Connection object;
* otherwise it returns null"
*/
@Override
public Connection connect(String url, Properties info) throws SQLException {
return acceptsURL(url) ? new HiveConnection(url, info) : null;
}
/**
* Package scoped access to the Driver's Major Version
* @return The Major version number of the driver. -1 if it cannot be determined from the
* manifest.mf file.
*/
static int getMajorDriverVersion() {
int version = -1;
try {
String fullVersion = HiveDriver.fetchManifestAttribute(
Attributes.Name.IMPLEMENTATION_VERSION);
String[] tokens = fullVersion.split("\\."); //$NON-NLS-1$
if(tokens != null && tokens.length > 0 && tokens[0] != null) {
version = Integer.parseInt(tokens[0]);
}
} catch (Exception e) {
// Possible reasons to end up here:
// - Unable to read version from manifest.mf
// - Version string is not in the proper X.x.xxx format
version = -1;
}
return version;
}
/**
* Package scoped access to the Driver's Minor Version
* @return The Minor version number of the driver. -1 if it cannot be determined from the
* manifest.mf file.
*/
static int getMinorDriverVersion() {
int version = -1;
try {
String fullVersion = HiveDriver.fetchManifestAttribute(
Attributes.Name.IMPLEMENTATION_VERSION);
String[] tokens = fullVersion.split("\\."); //$NON-NLS-1$
if(tokens != null && tokens.length > 1 && tokens[1] != null) {
version = Integer.parseInt(tokens[1]);
}
} catch (Exception e) {
// Possible reasons to end up here:
// - Unable to read version from manifest.mf
// - Version string is not in the proper X.x.xxx format
version = -1;
}
return version;
}
/**
* Returns the major version of this driver.
*/
@Override
public int getMajorVersion() {
return HiveDriver.getMajorDriverVersion();
}
/**
* Returns the minor version of this driver.
*/
@Override
public int getMinorVersion() {
return HiveDriver.getMinorDriverVersion();
}
public Logger getParentLogger() throws SQLFeatureNotSupportedException {
// JDK 1.7
throw new SQLFeatureNotSupportedException("Method not supported");
}
@Override
public DriverPropertyInfo[] getPropertyInfo(String url, Properties info) throws SQLException {
if (info == null) {
info = new Properties();
}
if ((url != null) && url.startsWith(Utils.URL_PREFIX)) {
info = parseURLforPropertyInfo(url, info);
}
DriverPropertyInfo hostProp = new DriverPropertyInfo(HOST_PROPERTY_KEY,
info.getProperty(HOST_PROPERTY_KEY, ""));
hostProp.required = false;
hostProp.description = "Hostname of Hive Server2";
DriverPropertyInfo portProp = new DriverPropertyInfo(PORT_PROPERTY_KEY,
info.getProperty(PORT_PROPERTY_KEY, ""));
portProp.required = false;
portProp.description = "Port number of Hive Server2";
DriverPropertyInfo dbProp = new DriverPropertyInfo(DBNAME_PROPERTY_KEY,
info.getProperty(DBNAME_PROPERTY_KEY, "default"));
dbProp.required = false;
dbProp.description = "Database name";
DriverPropertyInfo[] dpi = new DriverPropertyInfo[3];
dpi[0] = hostProp;
dpi[1] = portProp;
dpi[2] = dbProp;
return dpi;
}
/**
* Returns whether the driver is JDBC compliant.
*/
@Override
public boolean jdbcCompliant() {
return JDBC_COMPLIANT;
}
/**
* Takes a url in the form of jdbc:hive://[hostname]:[port]/[db_name] and
* parses it. Everything after jdbc:hive// is optional.
*
* The output from Utils.parseUrl() is massaged for the needs of getPropertyInfo
* @param url
* @param defaults
* @return
* @throws java.sql.SQLException
*/
private Properties parseURLforPropertyInfo(String url, Properties defaults) throws SQLException {
Properties urlProps = (defaults != null) ? new Properties(defaults)
: new Properties();
if (url == null || !url.startsWith(Utils.URL_PREFIX)) {
throw new SQLException("Invalid connection url: " + url);
}
JdbcConnectionParams params = null;
try {
params = Utils.parseURL(url, defaults);
} catch (ZooKeeperHiveClientException e) {
throw new SQLException(e);
}
String host = params.getHost();
if (host == null){
host = "";
}
String port = Integer.toString(params.getPort());
if(host.equals("")){
port = "";
}
else if(port.equals("0") || port.equals("-1")){
port = Utils.DEFAULT_PORT;
}
String db = params.getDbName();
urlProps.put(HOST_PROPERTY_KEY, host);
urlProps.put(PORT_PROPERTY_KEY, port);
urlProps.put(DBNAME_PROPERTY_KEY, db);
return urlProps;
}
/**
* Lazy-load manifest attributes as needed.
*/
private static Attributes manifestAttributes = null;
/**
* Loads the manifest attributes from the jar.
*
* @throws java.net.MalformedURLException
* @throws IOException
*/
private static synchronized void loadManifestAttributes() throws IOException {
if (manifestAttributes != null) {
return;
}
Class clazz = HiveDriver.class;
String classContainer = clazz.getProtectionDomain().getCodeSource()
.getLocation().toString();
URL manifestUrl = new URL("jar:" + classContainer
+ "!/META-INF/MANIFEST.MF");
Manifest manifest = new Manifest(manifestUrl.openStream());
manifestAttributes = manifest.getMainAttributes();
}
/**
* Package scoped to allow manifest fetching from other HiveDriver classes
* Helper to initialize attributes and return one.
*
* @param attributeName
* @return
* @throws SQLException
*/
static String fetchManifestAttribute(Attributes.Name attributeName)
throws SQLException {
try {
loadManifestAttributes();
} catch (IOException e) {
throw new SQLException("Couldn't load manifest attributes.", e);
}
return manifestAttributes.getValue(attributeName);
}
}