private FilterImpl parse_or()
{
int lookahead = pos;
SkipWhiteSpace();
if (filterChars[pos] != '(')
{
pos = lookahead - 1;
return(parse_item());
}
var operands = new ArrayList(10);
while (filterChars[pos] == '(')
{
FilterImpl child = parse_filter();
operands.Add(child);
}
var newArray = new FilterImpl[operands.Count];
operands.CopyTo(newArray, 0);
return(new FilterImpl(FilterImpl.OR, null, newArray));
}
private FilterImpl parse_not()
{
int lookahead = pos;
SkipWhiteSpace();
if (filterChars[pos] != '(')
{
pos = lookahead - 1;
return(parse_item());
}
FilterImpl child = parse_filter();
return(new FilterImpl(FilterImpl.NOT, null, child));
}
/// <summary>
/// 创建过滤器对象
/// </summary>
/// <param name="filter"></param>
/// <returns></returns>
public IFilter createFilter(String filter)
{
return(FilterImpl.NewInstance(filter));
}
