A whole bunch of revampery on the way to collection caching, including some

basic stats reporting and query and cache logging.

PersistenceContext no longer sticks its nose so deeply into the business of
Query and Modifier. It just passes itself along and allows them to do any cache
activity they need during their normal execution. The one situation where we
keep our nose in their business is to allow a Query to return a result from the
cache before it is even invoked so that we can avoid requesting a database
connection if we won't ever need one.

src/java/com/samskivert/depot/operator/Conditionals.java

@@ -69,6 +69,12 @@ public abstract class Conditionals
         {
         }
 
+        @Override // from Object
+        public String toString ()
+        {
+            return "IsNull(" + _column + ")";
+        }
+
         protected ColumnExp _column;
     }
 
@@ -240,6 +246,20 @@ public abstract class Conditionals
             _column.addClasses(classSet);
         }
 
+        @Override // from Object
+        public String toString ()
+        {
+            StringBuilder builder = new StringBuilder();
+            builder.append(_column).append(" in (");
+            for (int ii = 0; ii < _values.length; ii++) {
+                if (ii > 0) {
+                    builder.append(", ");
+                }
+                builder.append(_values[ii]);
+            }
+            return builder.append(")").toString();
+        }
+
         protected ColumnExp _column;
         protected Comparable<?>[] _values;
     }
@@ -286,6 +306,12 @@ public abstract class Conditionals
             return _clause;
         }
 
+        @Override // from Object
+        public String toString ()
+        {
+            return "Exists(" + _clause + ")";
+        }
+
         protected SelectClause<T> _clause;
     }
 
@@ -329,6 +355,12 @@ public abstract class Conditionals
         {
         }
 
+        @Override // from Object
+        public String toString ()
+        {
+            return "FullText(" + _name + "=" + _query + ")";
+        }
+
         protected Class<? extends PersistentRecord> _pClass;
         protected String _name;
         protected String _query;