1 files changed, 74 insertions, 0 deletions
diff --git a/src/interfaces/jdbc/utils/CheckVersion.java b/src/interfaces/jdbc/utils/CheckVersion.java
new file mode 100644
index 00000000000..a2438cd4f9f
--- /dev/null
+++ b/src/interfaces/jdbc/utils/CheckVersion.java
@@ -0,0 +1,74 @@
+package utils;
+
+/*
+ * This little app checks to see what version of JVM is being used.
+ * It does this by checking first the java.vm.version property, and
+ * if that fails, it looks for certain classes that should be present.
+ */
+public class CheckVersion
+{
+	/*
+	 * Check for the existence of a class by attempting to load it
+	 */
+	public static boolean checkClass(String c)
+	{
+		try
+		{
+			Class.forName(c);
+		}
+		catch (Exception e)
+		{
+			return false;
+		}
+		return true;
+	}
+
+	/*
+	 * This first checks java.vm.version for 1.1, 1.2 or 1.3.
+	 *
+	 * It writes jdbc1 to stdout for the 1.1.x VM.
+	 *
+	 * For 1.2 or 1.3, it checks for the existence of the javax.sql.DataSource
+	 * interface, and if found writes enterprise to stdout. If the interface
+	 * is not found, it writes jdbc2 to stdout.
+	 *
+	 * PS: It also looks for the existence of java.lang.Byte which appeared in
+	 * JDK1.1.0 incase java.vm.version is not heeded by some JVM's.
+	 *
+	 * If it can't work it out, it writes huho to stdout.
+	 *
+	 * The make file uses the written results to determine which rule to run.
+	 *
+	 * Bugs: This needs thorough testing.
+	 */
+	public static void main(String args[])
+	{
+		String vmversion = System.getProperty("java.vm.version");
+
+		System.out.println("postgresql.jdbc=" + System.getProperty("postgresql.jdbc"));
+
+		// We are running a 1.1 JVM
+		if (vmversion.startsWith("1.1"))
+		{
+			System.out.println("jdbc1");
+			//System.exit(0);
+		}
+		else
+			// We are running a 1.2 or 1.3 JVM
+			if (vmversion.startsWith("1.2") ||
+					vmversion.startsWith("1.3") ||
+					checkClass("java.lang.Byte")
+			   )
+			{
+
+				// Check to see if we have the standard extensions. If so, then
+				// we want the enterprise edition, otherwise the jdbc2 driver.
+				if (checkClass("javax.sql.DataSource"))
+					System.out.println("enterprise");
+				else
+					System.out.println("jdbc2");
+				//System.exit(0);
+			}
+		System.setProperty("postgresql.jdbc", "yoyo");
+	}
+}