[#6013] Add Name Name.qualifier()

jOOQ/src/main/java/org/jooq/Name.java

@@ -82,6 +82,11 @@ public interface Name extends QueryPart {
      */
     boolean qualified();
 
+    /**
+     * This name's qualifier (if it is {@link #qualified()}), or <code>null</code>.
+     */
+    Name qualifier();
+
     /**
      * The qualified name of this SQL identifier.
      */

jOOQ/src/main/java/org/jooq/impl/QualifiedField.java

@@ -36,8 +36,6 @@ package org.jooq.impl;
 
 import static org.jooq.tools.StringUtils.defaultIfNull;
 
-import java.util.Arrays;
-
 import org.jooq.Context;
 import org.jooq.DataType;
 import org.jooq.Field;
@@ -68,7 +66,7 @@ final class QualifiedField<T> extends AbstractField<T> implements TableField<Rec
 
         this.name = name;
         this.table = name.qualified()
-            ? DSL.table(DSL.name(Arrays.copyOf(name.getName(), name.getName().length - 1)))
+            ? DSL.table(name.qualifier())
             : null;
     }
 

jOOQ/src/main/java/org/jooq/impl/QualifiedName.java

@@ -153,6 +153,18 @@ final class QualifiedName extends AbstractName {
         return qualifiedName.length > 1;
     }
 
+    @Override
+    public final Name qualifier() {
+        if (qualifiedName.length <= 1)
+            return null;
+        if (qualifiedName.length == 2)
+            return qualifiedName[0];
+
+        UnqualifiedName[] qualifier = new UnqualifiedName[qualifiedName.length - 1];
+        System.arraycopy(qualifiedName, 0, qualifier, 0, qualifier.length);
+        return new QualifiedName(qualifier);
+    }
+
     @Override
     public final String[] getName() {
         String[] result = new String[qualifiedName.length];

jOOQ/src/main/java/org/jooq/impl/UnqualifiedName.java

@@ -35,6 +35,7 @@
 package org.jooq.impl;
 
 import org.jooq.Context;
+import org.jooq.Name;
 
 /**
  * The default implementation for an unqualified SQL identifier.
@@ -88,6 +89,11 @@ final class UnqualifiedName extends AbstractName {
         return false;
     }
 
+    @Override
+    public final Name qualifier() {
+        return null;
+    }
+
     @Override
     public final String[] getName() {
         return new String[] { name };