HHH-7797 UniqueDelegate & DefaultUniqueDelegate

hibernate-core/src/main/java/org/hibernate/dialect/Dialect.java

@@ -58,6 +58,8 @@ import org.hibernate.dialect.lock.PessimisticWriteSelectLockingStrategy;
 import org.hibernate.dialect.lock.SelectLockingStrategy;
 import org.hibernate.dialect.pagination.LegacyLimitHandler;
 import org.hibernate.dialect.pagination.LimitHandler;
+import org.hibernate.dialect.unique.DefaultUniqueDelegate;
+import org.hibernate.dialect.unique.UniqueDelegate;
 import org.hibernate.engine.jdbc.LobCreator;
 import org.hibernate.engine.spi.RowSelection;
 import org.hibernate.engine.spi.SessionImplementor;
@@ -116,6 +118,8 @@ public abstract class Dialect implements ConversionContext {
 	private final Map<String, SQLFunction> sqlFunctions = new HashMap<String, SQLFunction>();
 	private final Set<String> sqlKeywords = new HashSet<String>();
 	
+	private final UniqueDelegate uniqueDelegate;
+
 
 	// constructors and factory methods ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -203,6 +207,8 @@ public abstract class Dialect implements ConversionContext {
 		registerHibernateType( Types.BLOB, StandardBasicTypes.BLOB.getName() );
 		registerHibernateType( Types.CLOB, StandardBasicTypes.CLOB.getName() );
 		registerHibernateType( Types.REAL, StandardBasicTypes.FLOAT.getName() );
+		
+		uniqueDelegate = new DefaultUniqueDelegate( this );
 	}
 
 	/**
@@ -1907,23 +1913,6 @@ public abstract class Dialect implements ConversionContext {
 		return true;
 	}
 
-	/**
-	 * Does this dialect support the <tt>UNIQUE</tt> column syntax?
-	 *
-	 * @return boolean
-	 */
-	public boolean supportsUnique() {
-		return true;
-	}
-
-    /**
-     * Does this dialect support adding Unique constraints via create and alter table ?
-     * @return boolean
-     */
-	public boolean supportsUniqueConstraintInCreateAlterTable() {
-	    return true;
-	}
-
 	/**
 	 * The syntax used to add a column to a table (optional).
 	 *
@@ -1989,16 +1978,6 @@ public abstract class Dialect implements ConversionContext {
 		return " add constraint " + constraintName + " primary key ";
 	}
 
-    /**
-     * The syntax used to add a unique constraint to a table.
-     *
-     * @param constraintName The name of the unique constraint.
-     * @return The "add unique" fragment
-     */
-    public String getAddUniqueConstraintString(String constraintName) {
-        return " add constraint " + constraintName + " unique ";
-    }
-
 	public boolean hasSelfReferentialForeignKeyBug() {
 		return false;
 	}
@@ -2056,15 +2035,6 @@ public abstract class Dialect implements ConversionContext {
 		return true;
 	}
 
-	/**
-	 * Does this dialect support columns that are both unique and not null.
-	 * 
-	 * @return True if supported, false otherwise.
-	 */
-	public boolean supportsNotNullUnique() {
-		return true;
-	}
-
 	/**
 	 * Completely optional cascading drop clause
 	 *
@@ -2416,4 +2386,8 @@ public abstract class Dialect implements ConversionContext {
 	public boolean useFollowOnLocking() {
 		return false;
 	}
+	
+	public UniqueDelegate getUniqueDelegate() {
+		return uniqueDelegate;
+	}
 }

hibernate-core/src/main/java/org/hibernate/dialect/unique/DefaultUniqueDelegate.java

@@ -0,0 +1,89 @@
+/* 
+ * Hibernate, Relational Persistence for Idiomatic Java
+ * 
+ * JBoss, Home of Professional Open Source
+ * Copyright 2012 Red Hat Inc. and/or its affiliates and other contributors
+ * as indicated by the @authors tag. All rights reserved.
+ * See the copyright.txt in the distribution for a
+ * full listing of individual contributors.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU Lesser General Public License, v. 2.1.
+ * This program is distributed in the hope that it will be useful, but WITHOUT A
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+ * You should have received a copy of the GNU Lesser General Public License,
+ * v.2.1 along with this distribution; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA  02110-1301, USA.
+ */
+package org.hibernate.dialect.unique;
+
+import java.util.Iterator;
+import java.util.List;
+
+import org.hibernate.dialect.Dialect;
+import org.hibernate.mapping.Column;
+import org.hibernate.mapping.Table;
+import org.hibernate.mapping.UniqueKey;
+
+/**
+ * The default UniqueDelegate implementation for most dialects.  Uses
+ * separate create/alter statements to apply uniqueness to a column.
+ * 
+ * @author Brett Meyer
+ */
+public class DefaultUniqueDelegate implements UniqueDelegate {
+	
+	private final Dialect dialect;
+	
+	public DefaultUniqueDelegate( Dialect dialect ) {
+		this.dialect = dialect;
+	}
+
+	@Override
+	public void applyUnique( Table table, Column column, StringBuilder sb ) {
+//		if ( column.isUnique()
+//				&& ( column.isNullable()
+//						|| dialect.supportsNotNullUnique() ) ) {
+//			if ( dialect.supportsUniqueConstraintInCreateAlterTable() ) {
+//				// If the constraint is supported, do not add to the column syntax.
+//				UniqueKey uk = getOrCreateUniqueKey( column.getQuotedName( dialect ) + '_' );
+//				uk.addColumn( column );
+//			}
+//			else if ( dialect.supportsUnique() ) {
+//				// Otherwise, add to the column syntax if supported.
+//				sb.append( " unique" );
+//			}
+//		}
+		
+		UniqueKey uk = table.getOrCreateUniqueKey(
+				column.getQuotedName( dialect ) + '_' );
+		uk.addColumn( column );
+	}
+
+	@Override
+	public void createUniqueConstraint( Table table, StringBuilder sb ) {
+//		if ( dialect.supportsUniqueConstraintInCreateAlterTable() ) {
+//			Iterator ukiter = getUniqueKeyIterator();
+//			while ( ukiter.hasNext() ) {
+//				UniqueKey uk = (UniqueKey) ukiter.next();
+//				String constraint = uk.sqlConstraintString( dialect );
+//				if ( constraint != null ) {
+//					buf.append( ", " ).append( constraint );
+//				}
+//			}
+//		}
+		
+		Iterator ukiter = table.getUniqueKeyIterator();
+		while ( ukiter.hasNext() ) {
+			UniqueKey uk = (UniqueKey) ukiter.next();
+			String constraint = uk.sqlConstraintString( dialect );
+			if ( constraint != null ) {
+				sb.append( ", " ).append( constraint );
+			}
+		}
+	}
+
+}

hibernate-core/src/main/java/org/hibernate/dialect/unique/UniqueDelegate.java

@@ -0,0 +1,45 @@
+/* 
+ * Hibernate, Relational Persistence for Idiomatic Java
+ * 
+ * JBoss, Home of Professional Open Source
+ * Copyright 2012 Red Hat Inc. and/or its affiliates and other contributors
+ * as indicated by the @authors tag. All rights reserved.
+ * See the copyright.txt in the distribution for a
+ * full listing of individual contributors.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU Lesser General Public License, v. 2.1.
+ * This program is distributed in the hope that it will be useful, but WITHOUT A
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+ * You should have received a copy of the GNU Lesser General Public License,
+ * v.2.1 along with this distribution; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA  02110-1301, USA.
+ */
+package org.hibernate.dialect.unique;
+
+import org.hibernate.mapping.Column;
+import org.hibernate.mapping.Table;
+
+/**
+ * Dialect-level delegate in charge of applying "uniqueness" to a column.
+ * Uniqueness can be defined in 1 of 3 ways:
+ * 
+ * 1.) Add a unique constraint via separate create/alter table statements.
+ * 2.) Add a unique constraint via dialect-specific syntax in table create statement.
+ * 3.) Add "unique" syntax to the column itself.
+ * 
+ * #1 & #2 are preferred, if possible -- #3 should be solely a fall-back.
+ * 
+ * See HHH-7797.
+ * 
+ * @author Brett Meyer
+ */
+public interface UniqueDelegate {
+	
+	public void applyUnique( Table table, Column column, StringBuilder sb );
+	
+	public void createUniqueConstraint( Table table, StringBuilder sb );
+}

hibernate-core/src/main/java/org/hibernate/mapping/Table.java

@@ -422,15 +422,7 @@ public class Table implements RelationalModel, Serializable {
 					alter.append( " not null" );
 				}
 
-				// If the column is 1.) unique, 2.) the dialect supports the
+				dialect.getUniqueDelegate().applyUnique( this, column, alter );
-				// unique syntax, 3.) the column is nullable or supports
-				// "not null unique", and 4.) a constraint will not be created
-				if ( column.isUnique() && dialect.supportsUnique()
-						&& ( column.isNullable()
-								|| dialect.supportsNotNullUnique() )
-						&& !dialect.supportsUniqueConstraintInCreateAlterTable() ) {
-					alter.append( " unique" );
-				}
 
 				if ( column.hasCheckConstraint() && dialect.supportsColumnCheck() ) {
 					alter.append( " check(" )
@@ -527,21 +519,7 @@ public class Table implements RelationalModel, Serializable {
 
 			}
 			
-			// If the column is 1.) unique and nullable or 2.) unique,
+			dialect.getUniqueDelegate().applyUnique( this, col, buf );
-			// not null, and the dialect supports unique not null			
-			if ( col.isUnique()
-					&& ( col.isNullable()
-							|| dialect.supportsNotNullUnique() ) ) {
-				if ( dialect.supportsUniqueConstraintInCreateAlterTable() ) {
-					// If the constraint is supported, do not add to the column syntax.
-					UniqueKey uk = getOrCreateUniqueKey( col.getQuotedName( dialect ) + '_' );
-					uk.addColumn( col );
-				}
-				else if ( dialect.supportsUnique() ) {
-					// Otherwise, add to the column syntax if supported.
-					buf.append( " unique" );
-				}
-			}
 
 			if ( col.hasCheckConstraint() && dialect.supportsColumnCheck() ) {
 				buf.append( " check (" )
@@ -564,21 +542,7 @@ public class Table implements RelationalModel, Serializable {
 					.append( getPrimaryKey().sqlConstraintString( dialect ) );
 		}
 
-		if ( dialect.supportsUniqueConstraintInCreateAlterTable() ) {
+		dialect.getUniqueDelegate().createUniqueConstraint( this, buf );
-			Iterator ukiter = getUniqueKeyIterator();
-			while ( ukiter.hasNext() ) {
-				UniqueKey uk = (UniqueKey) ukiter.next();
-				String constraint = uk.sqlConstraintString( dialect );
-				if ( constraint != null ) {
-					buf.append( ", " ).append( constraint );
-				}
-			}
-		}
-		/*Iterator idxiter = getIndexIterator();
-		while ( idxiter.hasNext() ) {
-			Index idx = (Index) idxiter.next();
-			buf.append(',').append( idx.sqlConstraintString(dialect) );
-		}*/
 
 		if ( dialect.supportsTableCheck() ) {
 			Iterator chiter = checkConstraints.iterator();