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.impl;
  
  import org.callimachusproject.engine.model.Node;
  import org.callimachusproject.engine.model.GraphNodePathBase;
  
  /**
   * RDF blank node.
   * 
   * @author James Leigh
   *
   */
  public class BlankNode extends GraphNodePathBase implements Node {
  	private String id;
  
  	public BlankNode(String id) {
  		assert id != null;
  		this.id = id;
  	}
  
  	public String stringValue() {
  		return id;
  	}
  
  	public String toString() {
  		return "_:" + id;
  	}
  
  	@Override
  	public int hashCode() {
  		return id.hashCode();
  	}
  
  	@Override
  	public boolean equals(Object obj) {
  		if (this == obj)
  			return true;
  		if (obj == null)
  			return false;
  		if (getClass() != obj.getClass())
  			return false;
  		BlankNode other = (BlankNode) obj;
  		if (id == null) {
  			if (other.id != null)
  				return false;
  		} else if (!id.equals(other.id))
  			return false;
  		return true;
  	}
  
  }
  