content: /*******************************************************************************
   * Copyright (c) 2000, 2007 IBM Corporation and others.
   * All rights reserved. This program and the accompanying materials
   * are made available under the terms of the Eclipse Public License v1.0
   * which accompanies this distribution, and is available at
   * http://www.eclipse.org/legal/epl-v10.html
   *
   * Contributors:
   *   Robert M. Fuhrer (rfuhrer@watson.ibm.com), IBM Corporation - initial API and implementation
   *******************************************************************************/
  package org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets;
  
  import java.util.Iterator;
  
  import org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.types.TType;
  
  public class EmptyTypeSet extends TypeSet {
  
  	EmptyTypeSet(TypeSetEnvironment typeSetEnvironment) {
  		super(typeSetEnvironment);
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#isUniverse()
  	 */
  	public boolean isUniverse() {
  		return false;
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#makeClone()
  	 */
  	public TypeSet makeClone() {
  		return this;
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#intersectedWith(org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet)
  	 */
  	protected TypeSet specialCasesIntersectedWith(TypeSet s2) {
  		return this;
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#isEmpty()
  	 */
  	public boolean isEmpty() {
  		return true;
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#upperBound()
  	 */
  	public TypeSet upperBound() {
  		return this;
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#lowerBound()
  	 */
  	public TypeSet lowerBound() {
  		return this;
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#hasUniqueLowerBound()
  	 */
  	public boolean hasUniqueLowerBound() {
  		return false;
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#hasUniqueUpperBound()
  	 */
  	public boolean hasUniqueUpperBound() {
  		return false;
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#uniqueLowerBound()
  	 */
  	public TType uniqueLowerBound() {
  		return null;
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#uniqueUpperBound()
  	 */
  	public TType uniqueUpperBound() {
  		return null;
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#contains(TType)
  	 */
  	public boolean contains(TType t) {
  		return false;
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#containsAll(org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet)
  	 */
  	public boolean containsAll(TypeSet s) {
  		return false;
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#iterator()
  	 */
  	public Iterator iterator() {
  		return new Iterator() {
  			public void remove() {
  				//do nothing
  			}
  			public boolean hasNext() {
  				return false;
  			}
  			public Object next() {
  				return null;
  			}
  		};
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#isSingleton()
  	 */
  	public boolean isSingleton() {
  		return false;
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#anyMember()
  	 */
  	public TType anyMember() {
  		return null;
  	}
  
  	public String toString() {
  		return "{ }"; //$NON-NLS-1$
  	}
  
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.typesets.TypeSet#enumerate()
  	 */
  	public EnumeratedTypeSet enumerate() {
  		return new EnumeratedTypeSet(getTypeSetEnvironment());
  	}
  }
  