DenormalizedTable.java :  » Database-ORM » hibernate » org » hibernate » mapping » Java Open Source

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hibernate » org » hibernate » mapping » DenormalizedTable.java
/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * 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, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY 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
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 *
 */
package org.hibernate.mapping;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.hibernate.util.JoinedIterator;

/**
 * @author Gavin King
 */
public class DenormalizedTable extends Table {
  
  private final Table includedTable;
  
  public DenormalizedTable(Table includedTable) {
    this.includedTable = includedTable;
    includedTable.setHasDenormalizedTables();
  }
  
  public void createForeignKeys() {
    includedTable.createForeignKeys();
    Iterator iter = includedTable.getForeignKeyIterator();
    while ( iter.hasNext() ) {
      ForeignKey fk = (ForeignKey) iter.next();
      createForeignKey( 
          fk.getName() + Integer.toHexString( getName().hashCode() ), 
          fk.getColumns(), 
          fk.getReferencedEntityName() 
        );
    }
  }

  public Column getColumn(Column column) {
    Column superColumn = super.getColumn( column );
    if (superColumn != null) {
      return superColumn;
    }
    else {
      return includedTable.getColumn( column );
    }
  }

  public Iterator getColumnIterator() {
    return new JoinedIterator(
        includedTable.getColumnIterator(),
        super.getColumnIterator()
      );
  }

  public boolean containsColumn(Column column) {
    return super.containsColumn(column) || includedTable.containsColumn(column);
  }

  public PrimaryKey getPrimaryKey() {
    return includedTable.getPrimaryKey();
  }

  public Iterator getUniqueKeyIterator() {
    //wierd implementation because of hacky behavior
    //of Table.sqlCreateString() which modifies the
    //list of unique keys by side-effect on some
    //dialects
    Map uks = new HashMap();
    uks.putAll( getUniqueKeys() );
    uks.putAll( includedTable.getUniqueKeys() );
    return uks.values().iterator();
  }

  public Iterator getIndexIterator() {
    List indexes = new ArrayList();
    Iterator iter = includedTable.getIndexIterator();
    while ( iter.hasNext() ) {
      Index parentIndex = (Index) iter.next();
      Index index = new Index();
      index.setName( getName() + parentIndex.getName() );
      index.setTable(this);
      index.addColumns( parentIndex.getColumnIterator() );
      indexes.add( index );
    }
    return new JoinedIterator(
        indexes.iterator(),
        super.getIndexIterator()
      );
  }

}
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