// Generated by Together

package oisoft.togetherx.scripts.SQL.impl;

import java.util.Enumeration;
import COM.objectspace.jgl.UnaryFunction;
import oisoft.togetherx.scripts.SQL.SQLTable;

class ForeignKeyImpl implements oisoft.togetherx.scripts.SQL.SQLForeignKey {
  ForeignKeyImpl(TableImpl table, SQLTable referencedTable, boolean forcePrimaryKey){
    myTable = table;
    myReferencedTable = referencedTable;
    myForcePrimaryKey = forcePrimaryKey;
  }
  public SQLTable getTable(){
    return myTable;
  }
  public String getName(){
    return myTable.getForeignKeyName(this);
  }
  public Enumeration getColumns(){
    boolean showForeign = !myTable.equals(getReferencedTable());
    UnaryFunction filter
      = new UnaryFunction(){
          public Object execute(Object arg){
            if( !(arg instanceof ColumnImpl) ){
              return null;
            }
            else{
              return myTable.getForeignKeyColumn((ColumnImpl)arg, myForcePrimaryKey);
            }
          }
        };
    Enumeration source = null;
    if( getReferencedTable() instanceof TableImpl ){
      source = ((TableImpl)getReferencedTable()).getPrimaryKeyColumns(showForeign);
    }
    else{
      source = new EmptyEnumeration();
    }

    return new FilterEnumeration(source, filter);
  }
  public SQLTable getReferencedTable(){
    return myReferencedTable;
  }
  public Enumeration getReferencedColumns(){
    return getReferencedTable().getPrimaryKeyColumns();
  }

  private TableImpl myTable;
  private SQLTable myReferencedTable;
  private boolean myForcePrimaryKey;
}