provide a full SchemaFactory singleton (#1473)

* provide a singleton full schema factory

* privatize

* lower lock

Author: baltzell

common-tools/clas-io/src/main/java/org/jlab/utils/CLASResources.java

@@ -1,12 +1,28 @@
 package org.jlab.utils;
 
+import org.jlab.jnp.hipo4.data.SchemaFactory;
+
 /**
  *
  * @author gavalian
  * @author kenjo
  */
 public class CLASResources {
-    
+   
+    private static volatile SchemaFactory FULL_SCHEMA = null;
+
+    public static SchemaFactory getFullSchema() {
+        synchronized (FULL_SCHEMA) {
+            if (FULL_SCHEMA == null) {
+                FULL_SCHEMA = new SchemaFactory();
+                FULL_SCHEMA.initFromDirectory(getResourcePath("etc/bankdefs/hipo4"));
+            }
+        }
+        SchemaFactory s = new SchemaFactory();
+        s.copy(FULL_SCHEMA);
+        return s;
+    }
+
     public static String getResourcePath(String resource){
         String CLAS12DIR = System.getenv("CLAS12DIR");
         String CLAS12DIRPROP = System.getProperty("CLAS12DIR");
@@ -44,4 +60,5 @@ public static String getEnvironmentVariable(String envvarname){
 
         return null;
     }
+
 }