NotCondition.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;


/**
 * Outputs the negation of the given condition "(NOT <condition>)"
 *
 * @author James Ahlborn
 */
public class NotCondition extends Condition
{
  private Condition _condition;

  /**
   * {@code Object} -> {@code Condition} conversions handled by
   * {@link Converter#toConditionObject(Object)}.
   */
  public NotCondition(Object condition) {
    this(Converter.toConditionObject(condition));
  }
  
  public NotCondition(Condition condition) {
    _condition = condition;
  }

  @Override
  public boolean isEmpty() {
    return _condition.isEmpty();
  }
    
  @Override
  protected void collectSchemaObjects(ValidationContext vContext) {
    _condition.collectSchemaObjects(vContext);
  }
    
  @Override
  public void appendTo(AppendableExt app) throws IOException
  {
    if(!_condition.isEmpty()) {
      openParen(app);
      app.append("NOT ").append(_condition);
      closeParen(app);
    }
  }

}