package org.sourceforge.jemm.client;
   
   import java.lang.reflect.Field;
   
   /**
    * The unique key that identifies a field from a particular class.
    * 
    * All fields need to be keyed based on the declaring class as well as
    * the name, the combination of which uniquely defines any field.
   * 
   * @author Paul Keeble
   *
   */
  public class FieldKey {
  	private String name;
  	private Class<?> clazz;
  	
  	public FieldKey(Class<?> declaringClass, String name) {
  		if(declaringClass == null || name == null)
  			throw new IllegalArgumentException("DeclaringClass/fieldName may not be null");
  		this.clazz = declaringClass;
  		this.name = name;
  	}
  
  	public String getName() {
  		return name;
  	}
  
  	public Class<?> getClazz() {
  		return clazz;
  	}
  	
  	public String getClazzName() {
  		return clazz.getName();
  	}
  	
  	public Field getField() throws SecurityException, NoSuchFieldException {
  		return clazz.getDeclaredField(name);
  	}
  	
  	public boolean equals(Object obj) {
  		if(!(obj instanceof FieldKey))
  			return false;
  		FieldKey rhs = (FieldKey)obj;
  		return name.equals(rhs.name) 
  			&& clazz.equals(rhs.clazz);
  	}
  	
  	public int hashCode() {
  		return name.hashCode() + clazz.hashCode();
  	}
  	
  	public String toString() {
  		return "FieldKey(" + clazz.getName() + ", " + name +")";
  	}
  }