TableDefObject.java

/*
Copyright (c) 2008 Health Market Science, Inc.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License.

This library 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 library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
USA

You can contact Health Market Science at info@healthmarketscience.com
or at the following address:

Health Market Science
2700 Horizon Drive
Suite 200
King of Prussia, PA 19406
*/

package com.healthmarketscience.sqlbuilder;

import java.io.IOException;
import com.healthmarketscience.common.util.AppendableExt;
import com.healthmarketscience.sqlbuilder.dbspec.Table;


/**
 * Outputs the table definition <code>"<table> [<alias>]"</code>
 * (used for FROM clauses).
 *
 * @author James Ahlborn
 */
class TableDefObject extends TableObject
{
  TableDefObject(Table table) {
    super(table);
  }

  @Override
  public void appendTo(AppendableExt app) throws IOException {
    app.append(_table.getTableNameSQL());
    String alias = _table.getAlias();
    if(hasAlias(alias)) {
      app.append(" ").append(alias);
    }
  }

  /**
   * Returns {@code true} if the given alias is a non-empty string, {@code
   * false} otherwise.
   */
  public static boolean hasAlias(String alias) {
    return ((alias != null) && (alias.length() > 0));
  }
}