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#region license
// Copyright (c) 2005 - 2007 Ayende Rahien (ayende@ayende.com)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of Ayende Rahien nor the names of its
// contributors may be used to endorse or promote products derived from this
// software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion
using System;
using System.ComponentModel;
using System.Reflection;
using System.Xml.Serialization;
using Ayende.NHibernateQueryAnalyzer.Utilities;
namespace Ayende.NHibernateQueryAnalyzer.SchemaEditing
{
/// <summary>
/// Used to reference a field in a class, can get it's value and set it.
/// Handle arrays and simple values (string, enums) only.
/// </summary>
public class AttributeFieldReference : IFieldReference
{
#region Variables
public delegate void AttributeFieldReferenceEventHandler(AttributeFieldReference sender, AttributeFieldReferenceEventArgs e);
public event AttributeFieldReferenceEventHandler HasValueChanged;
protected bool isRequired;
protected object parent;
protected FieldInfo field, fieldSpecified;
protected string name;
private object defaultValue;
#endregion
#region Constructor
public AttributeFieldReference(object parent, FieldInfo field, FieldInfo fieldSpecified)
{
Validation.NotNull(parent, field);
this.parent = parent;
this.field = field;
this.fieldSpecified = fieldSpecified;
this.isRequired = IsRequiredAttribute(field);
SetNameAndType(field);
}
private static bool IsRequiredAttribute(FieldInfo field)
{
return field.GetCustomAttributes(typeof(RequiredTagAttribute),false).Length>0;
}
#endregion
#region Properties
public object DefaultValue
{
get { return defaultValue; }
}
public virtual bool IsRequired
{
get { return isRequired; }
}
public virtual object Value
{
get { return field.GetValue(parent); }
set
{
bool old = HasValue;
field.SetValue(parent, value);
if (old != HasValue)
OnHasValueChanged();
}
}
public virtual string Name
{
get { return name; }
}
/// <summary>
/// Return true if the inner value is an array with
/// elements or a non-null reference or is a default value.
/// </summary>
public bool HasValue
{
get
{
if(fieldSpecified!= null)
return (bool)fieldSpecified.GetValue(parent);
bool hasValue = ReflectionUtil.HasValue(Value) && Value.Equals(defaultValue) == false;
return hasValue;
}
}
public virtual Type Type
{
get { return field.FieldType; }
}
#endregion
#region Methods
public void SetToDefaultValue()
{
Value = defaultValue;
}
private void OnHasValueChanged()
{
if (HasValueChanged == null)
return;
HasValueChanged(this, new AttributeFieldReferenceEventArgs(HasValue));
}
protected void SetNameAndType(FieldInfo field)
{
XmlAttributeAttribute[] att = (XmlAttributeAttribute[]) field.GetCustomAttributes(typeof (XmlAttributeAttribute), false);
DefaultValueAttribute[] def = (DefaultValueAttribute[]) field.GetCustomAttributes(typeof (DefaultValueAttribute), false);
if (att.Length == 0 || att[0].AttributeName == "")
this.name = field.Name;
else
this.name = att[0].AttributeName;
if (def.Length > 0)
defaultValue = def[0].Value;
}
#endregion
}
public class AttributeFieldReferenceEventArgs : EventArgs
{
private bool hasValue;
public bool HasValue
{
get { return hasValue; }
}
public AttributeFieldReferenceEventArgs(bool hasValue)
{
this.hasValue = hasValue;
}
}
} |
