content: /*
     Portions Copyright (c) 2009-10 Zepheira LLC, Some Rights Reserved
     Portions Copyright (c) 2010-11 Talis Inc, Some Rights Reserved
  
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at
  
         http://www.apache.org/licenses/LICENSE-2.0
  
     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
  
   */
  package org.callimachusproject.engine.model;
  
  /**
   * SPARQL variable.
   * 
   * @author James Leigh
   *
   */
  public abstract class Var extends GraphNodePathBase implements VarOrIRI {
  
  	@Override
  	public int hashCode() {
  		return stringValue().hashCode();
  	}
  
  	@Override
  	public boolean equals(Object obj) {
  		if (this == obj)
  			return true;
  		if (obj == null)
  			return false;
  		if (!(obj instanceof Var))
  			return false;
  		Var other = (Var) obj;
  		if (stringValue() == null) {
  			if (other.stringValue() != null)
  				return false;
  		} else if (!stringValue().equals(other.stringValue()))
  			return false;
  		return true;
  	}
  
  	public String toString() {
  		return prefix() + stringValue();
  	}
  
  	public abstract String prefix();
  }
  