Major update part I involving delayed patches, reworked Makefile, and how

the versioning works. There's also a new utils directory used by Makefile

1 files changed, 68 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..b82ba335fd3
--- /dev/null
+++ b/src/interfaces/jdbc/utils/CheckVersion.java
@@ -0,0 +1,68 @@
+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");
+	
+	// We are running a 1.1 JVM
+	if(vmversion.startsWith("1.1")) {
+	    System.out.println("jdbc1");
+	    System.exit(0);
+	}
+	
+	// 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.out.println("huho");
+	System.exit(0);
+    }
+}