public NativeSQLQuerySpecification(String queryString,
    NativeSQLQueryReturn[] queryReturns,
    Collection querySpaces) 
{
		this.queryString = queryString;
		this.queryReturns = queryReturns;
		if ( querySpaces == null ) {
			this.querySpaces = Collections.EMPTY_SET;
		}
		else {
			Set tmp = new HashSet();
			tmp.addAll( querySpaces );
			this.querySpaces = Collections.unmodifiableSet( tmp );
		}
		// pre-determine and cache the hashcode
		int hashCode = queryString.hashCode();
		hashCode = 29 * hashCode + this.querySpaces.hashCode();
		if ( this.queryReturns != null ) {
			hashCode = 29 * hashCode + ArrayHelper.toList( this.queryReturns ).hashCode();
		}
		this.hashCode = hashCode;
}

 public boolean equals(Object o) 
{
		if ( this == o ) {
			return true;
		}
		if ( o == null || getClass() != o.getClass() ) {
			return false;
		}
		final NativeSQLQuerySpecification that = ( NativeSQLQuerySpecification ) o;
		return querySpaces.equals( that.querySpaces ) &&
		       queryString.equals( that.queryString ) &&
		       Arrays.equals( queryReturns, that.queryReturns );
}

 public NativeSQLQueryReturn[] getQueryReturns() 
{
		return queryReturns;
}

 public Set getQuerySpaces() 
{
		return querySpaces;
}

 public String getQueryString() 
{
		return queryString;
}

 public int hashCode() 
{
		return hashCode;
}