com.pivotal.gemfirexd.internal.iapi.services.info.JVMInfo Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of snappydata-store-shared Show documentation
TIBCO ComputeDB store based off Pivotal GemFireXD
There is a newer version: 1.6.7
Show newest version
/*

   Derby - Class com.pivotal.gemfirexd.internal.iapi.services.info.JVMInfo

   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.

 */

/*
 * Changes for GemFireXD distributed data platform (some marked by "GemStone changes")
 *
 * Portions Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * Licensed 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. See accompanying
 * LICENSE file.
 */

package com.pivotal.gemfirexd.internal.iapi.services.info;

import java.sql.Types;


/**
	This class is used to determine which Java specification Derby will run at.
    For a useful discussion of how this class is used, please see DERBY-3176.
 */
public abstract class JVMInfo
{
	/**
		The JVM's runtime environment.
		
		 1 - not used was JDK 1.1
		
 2 - not used, was for JDK 1.2 and 1.3
		
 4 - J2SE_14 - JDK 1.4.0 or 1.4.1
		
 5 - J2SE_142 - JDK 1.4.2
		
 6 - J2SE_15 - JDK 1.5
		
 7 - J2SE_16 - JDK 1.6
		
	*/
	public static final int JDK_ID;

	public static final int J2SE_14 = 4;
	public static final int J2SE_142 = 5;
	public static final int J2SE_15 = 6; // aka J2SE 5.0
	public static final int J2SE_16 = 7; // Java SE 6, not J2SE
// GemStone changes BEGIN
	public static final int J2SE_17 = 8; // Java SE 7
// GemStone changes END

	public static final boolean J2ME;

	/**
    JDBC Boolean type - Types.BIT in JDK1.1 & 1.2 & 1.3, Types.BOOLEAN in JDK1.4
	*/
	public static final int JAVA_SQL_TYPES_BOOLEAN;

	static 
	{
		int id;

		//
		// If the property java.specification.version is set, then try to parse
		// that.  Anything we don't recognize, default to Java 2 platform
		// because java.specification.version is a property that is introduced
		// in Java 2.  We hope that JVM vendors don't implement Java 1 and
		// set a Java 2 system property.
		// 
		// Otherwise, see if we recognize what is set in java.version.
		// If we don't recoginze that, or if the property is not set, assume
		// version 1.3.
		//
		String javaVersion;
		String javaSpec;
		boolean isJ2ME;

		try {
			javaSpec = System.getProperty("java.specification.name");
		} catch (SecurityException se) {
			// some vms do not know about this property so they
			// throw a security exception when access is restricted.
			javaSpec = null;
		}

		try {
			javaVersion = System.getProperty("java.specification.version", "1.4");

		} catch (SecurityException se) {
			// some vms do not know about this property so they
			// throw a security exception when access is restricted.
			javaVersion = "1.4";
		}

		if (javaSpec != null &&
            (
             javaSpec.startsWith("J2ME") || // recognize IBM WCTME
             (
              (javaSpec.indexOf( "Profile" ) > -1) && // recognize phoneME
              (javaSpec.indexOf( "Specification" ) > -1)
             )
            )
            )
		{
			id = J2SE_14;
			isJ2ME = true;
		}
		else
		{
			// J2SE/J2EE
			isJ2ME = false;

			if (javaVersion.equals("1.4"))
			{
				String vmVersion = System.getProperty("java.version", "1.4.0");

				if (JVMInfo.vmCheck(vmVersion, "1.4.0") || JVMInfo.vmCheck(vmVersion, "1.4.1"))
					id = J2SE_14;
				else
					id = J2SE_142;
			}
			else if (javaVersion.equals("1.5"))
			{
				id = J2SE_15;
			}
			else if (javaVersion.equals("1.6"))
			{
				id = J2SE_16;
			}
// GemStone changes BEGIN
			else if (javaVersion.equals("1.7")) {
			  id = J2SE_17;
			}
// GemStone changes END
			else
			{
				// aussme our lowest support unless the java spec
				// is greater than our highest level.
				id = J2SE_14;

				try {

					if (Float.valueOf(javaVersion).floatValue() > 1.6f)
						id = J2SE_16;
				} catch (NumberFormatException nfe) {
				}
			}
		}

		JDK_ID = id;
		J2ME = isJ2ME;
		JAVA_SQL_TYPES_BOOLEAN = (isJ2ME || id >= J2SE_14) ?
			Types.BOOLEAN :java.sql.Types.BIT;
	}

	/**
		Check the vmVersion against a speciifc value.
		Sun jvms are of the form
	*/
	private static boolean vmCheck(String vmVersion, String id)
	{
		return vmVersion.equals(id) || vmVersion.startsWith(id + "_");
	}

	/**
		Return Derby's understanding of the virtual machine's environment.
	*/
	public static String derbyVMLevel()
	{
		switch (JDK_ID)
		{
		case J2SE_14: return J2ME ? "J2ME - JDBC for CDC/FP 1.1" : "J2SE 1.4 - JDBC 3.0";
		case J2SE_142: return "J2SE 1.4.2 - JDBC 3.0";
		case J2SE_15: return "J2SE 5.0 - JDBC 3.0";
		case J2SE_16: return "Java SE 6 - JDBC 4.0";
// GemStone changes BEGIN
		case J2SE_17: return "Java SE 7 - JDBC 4.1";
// GemStone changes END
		default: return "?-?";
		}
	}

}