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:
   *     IBM Corporation - initial API and implementation
   *******************************************************************************/
  package org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints;
  
  import org.eclipse.wst.jsdt.core.dom.ITypeBinding;
  import org.eclipse.wst.jsdt.internal.corext.dom.Bindings;
  import org.eclipse.wst.jsdt.internal.corext.dom.TypeRules;
  
  public abstract class ConstraintVariable {
  	/**
  	 * The type binding, or <code>null</code>.
  	 */
  	private final ITypeBinding fTypeBinding;
  
  	/**
  	 * @param binding the type binding, or <code>null</code>
  	 */
  	protected ConstraintVariable(ITypeBinding binding) {
  		fTypeBinding= binding;
  	}
  
  	public boolean canBeAssignedTo(ConstraintVariable targetVariable) {
  		if (fTypeBinding == null || targetVariable.fTypeBinding == null)
  			return false;
  		return TypeRules.canAssign(fTypeBinding, targetVariable.fTypeBinding);
  	}
  
  	public String toResolvedString() {
  		if (fTypeBinding == null)
  			return "<NULL BINDING>"; //$NON-NLS-1$
  		return Bindings.asString(fTypeBinding);
  	}
  
  	/* (non-Javadoc)
  	 * @see java.lang.Object#toString()
  	 */
  	public String toString() {
  		return toResolvedString();
  	}
  		
  	/**
  	 * @return the type binding or <code>null</code>
  	 */
  	//TODO: rename to getTypeBinding()
  	public ITypeBinding getBinding() {
  		return fTypeBinding;
  	}
  
  	/**
  	 * For storing additional information associated with constraint variables. 
  	 * Added in anticipation of the generics-related refactorings.
  	 */
  	private Object fData;
  	
  	public Object getData(){
  		return fData;
  	}
  	
  	public void setData(Object data){
  		fData= data;
  	}
  }
  