added support for Ruby

h2/src/docsrc/help/help.csv

@@ -735,7 +735,9 @@ The class must be available in the classpath of the database engine
 
 The sourceCodeString must define a single method with no parameters that returns ""org.h2.api.Trigger"".
 See CREATE ALIAS for requirements regarding the compilation.
-Alternatively, it can be a javascript (see javax.script.ScriptEngineManager) that returns ""org.h2.api.Trigger"". In that case the source must begin with ""//javascript"".
+Alternatively, javax.script.ScriptEngineManager can be used to create an instance of ""org.h2.api.Trigger"".
+Currently javascript (included in every JRE) and ruby (with JRuby) are supported.
+In that case the source must begin respectively with ""//javascript"" or ""#ruby"".
 
 BEFORE triggers are called after data conversion is made, default values are set,
 null and length constraint checks have been made;
@@ -774,7 +776,8 @@ This command commits an open transaction in this connection.
 ","
 CREATE TRIGGER TRIG_INS BEFORE INSERT ON TEST FOR EACH ROW CALL ""MyTrigger"";
 CREATE TRIGGER TRIG_SRC BEFORE INSERT ON TEST AS $$org.h2.api.Trigger create() { return new MyTrigger(""constructorParam""); } $$;
-CREATE TRIGGER TRIG_SCRIPT BEFORE INSERT ON TEST AS $$//javascript\nreturn new Packages.MyTrigger(""constructorParam""); $$;
+CREATE TRIGGER TRIG_JS BEFORE INSERT ON TEST AS $$//javascript\nreturn new Packages.MyTrigger(""constructorParam""); $$;
+CREATE TRIGGER TRIG_RUBY BEFORE INSERT ON TEST AS $$#ruby\nJava::MyPackage::MyTrigger.new(""constructorParam"") $$;
 "
 "Commands (DDL)","CREATE USER","
 CREATE USER [ IF NOT EXISTS ] newUserName

h2/src/main/org/h2/util/SourceCompiler.java

@@ -186,9 +186,13 @@ public class SourceCompiler {
         return source.startsWith("//javascript");
     }
 
+    private static boolean isRubySource(String source) {
+        return source.startsWith("#ruby");
+    }
+
     // whether the passed source should be compiled using javax.script.ScriptEngineManager
     private static boolean isJavaxScriptSource(String source) {
-        return isJavascriptSource(source);
+        return isJavascriptSource(source) || isRubySource(source);
     }
 
     public CompiledScript getCompiledScript(String packageAndClassName) throws ScriptException {
@@ -198,6 +202,8 @@ public class SourceCompiler {
             final String lang;
             if (isJavascriptSource(source))
                 lang = "javascript";
+            else if (isRubySource(source))
+                lang = "ruby";
             else
                 throw new IllegalStateException("Unkown language for " + source);