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//
// System.Web.UI.DataBinder.cs
//
// Authors:
// Duncan Mak (duncan@ximian.com)
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// (C) 2002 Ximian, Inc. (http://www.ximian.com)
//
using System;
using System.Collections;
using System.ComponentModel;
using System.Reflection;
namespace System.Web.UI {
public sealed class DataBinder
{
public DataBinder ()
{
}
private static string FormatResult (object result, string format)
{
if (result == null)
return String.Empty;
if (format == null)
return result.ToString ();
return String.Format (format, result);
}
public static object Eval (object container, string expression)
{
if (expression == null)
throw new ArgumentNullException ("expression");
object current = container;
while (current != null) {
int dot = expression.IndexOf ('.');
int size = (dot == -1) ? expression.Length : dot;
string prop = expression.Substring (0, size);
if (prop.IndexOf ('[') != -1)
current = GetIndexedPropertyValue (current, prop);
else
current = GetPropertyValue (current, prop);
if (dot == -1)
break;
expression = expression.Substring (prop.Length + 1);
}
return current;
}
public static string Eval (object container, string expression, string format)
{
object result = Eval (container, expression);
return FormatResult (result, format);
}
public static object GetIndexedPropertyValue (object container, string expr)
{
if (expr == null)
throw new ArgumentNullException ("expr");
int openIdx = expr.IndexOf ('[');
int closeIdx = expr.IndexOf (']'); // see the test case. MS ignores all after the first ]
if (openIdx < 0 || closeIdx < 0 || closeIdx - openIdx <= 1)
throw new ArgumentException (expr + " is not a valid indexed expression.");
string val = expr.Substring (openIdx + 1, closeIdx - openIdx - 1);
val = val.Trim ();
int valLength = val.Length;
if (valLength == 0)
throw new ArgumentException (expr + " is not a valid indexed expression.");
int intVal = 0;
bool is_string;
char first = val [0];
if (first >= '0' && first <= '9') {
is_string = false;
try {
intVal = Int32.Parse (val);
} catch {
throw new ArgumentException (expr + " is not a valid indexed expression.");
}
} else if (first == '"' && val [valLength - 1] == '"') {
is_string = true;
val = val.Substring (0, val.Length - 1).Substring (1);
} else {
throw new ArgumentException (expr + " is not a valid indexed expression.");
}
string property = null;
if (openIdx > 0) {
property = expr.Substring (0, openIdx);
if (property != null && property != String.Empty)
container = GetPropertyValue (container, property);
}
if (container == null)
return null;
if (container is System.Collections.IList) {
IList l = (IList) container;
return l [intVal];
}
Type t = container.GetType ();
// MS does not seem to look for any other than "Item"!!!
object [] atts = t.GetCustomAttributes (typeof (DefaultMemberAttribute), false);
if (atts.Length != 1)
throw new ArgumentException (expr + " indexer not found.");
property = ((DefaultMemberAttribute) atts [0]).MemberName;
Type [] argTypes = new Type [] { (is_string) ? typeof (string) : typeof (int) };
PropertyInfo prop = t.GetProperty (property, argTypes);
if (prop == null)
throw new ArgumentException (expr + " indexer not found.");
object [] args = new object [1];
if (is_string)
args [0] = val;
else
args [0] = intVal;
return prop.GetValue (container, args);
}
public static string GetIndexedPropertyValue (object container, string expr, string format)
{
object result = GetIndexedPropertyValue (container, expr);
return FormatResult (result, format);
}
public static object GetPropertyValue (object container, string propName)
{
if (propName == null)
throw new ArgumentNullException ("propName");
PropertyDescriptor prop = TypeDescriptor.GetProperties (container).Find (propName, true);
if (prop == null) {
throw new HttpException ("Property " + propName + " not found in " +
container.GetType ());
}
return prop.GetValue (container);
}
public static string GetPropertyValue (object container, string propName, string format)
{
object result = GetPropertyValue (container, propName);
return FormatResult (result, format);
}
#if NET_1_2
public static object GetDataItem (object container, out bool foundDataItem)
{
foundDataItem = false;
if (container == null)
return null;
PropertyInfo pi = container.GetType ().GetProperty ("DataItem", BindingFlags.Public | BindingFlags.Instance);
if (pi == null)
return null;
foundDataItem = true;
return pi.GetValue (container, null);
}
public static object GetDataItem (object container)
{
bool flag;
return GetDataItem (container, out flag);
}
#endif
}
}
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