/// <summary>
/// This method is for introspection of attributes, it should simply
/// add the key/values this attribute holds to the given <see cref="IAttributeReflector"/>.
///
/// <para/>The default implementation calls <see cref="IAttributeReflector.Reflect(Type, string, object)"/> for all
/// non-static fields from the implementing class, using the field name as key
/// and the field value as value. The <see cref="IAttribute"/> class is also determined by Reflection.
/// Please note that the default implementation can only handle single-Attribute
/// implementations.
///
/// <para/>Custom implementations look like this (e.g. for a combined attribute implementation):
/// <code>
/// public void ReflectWith(IAttributeReflector reflector)
/// {
/// reflector.Reflect(typeof(ICharTermAttribute), "term", GetTerm());
/// reflector.Reflect(typeof(IPositionIncrementAttribute), "positionIncrement", GetPositionIncrement());
/// }
/// </code>
///
/// <para/>If you implement this method, make sure that for each invocation, the same set of <see cref="IAttribute"/>
/// interfaces and keys are passed to <see cref="IAttributeReflector.Reflect(Type, string, object)"/> in the same order, but possibly
/// different values. So don't automatically exclude e.g. <c>null</c> properties!
/// </summary>
/// <seealso cref="ReflectAsString(bool)"/>
public virtual void ReflectWith(IAttributeReflector reflector) // LUCENENET NOTE: This method was abstract in Lucene
{
Type clazz = this.GetType();
LinkedList <WeakReference <Type> > interfaces = AttributeSource.GetAttributeInterfaces(clazz);
if (interfaces.Count != 1)
{
throw UnsupportedOperationException.Create(clazz.Name + " implements more than one Attribute interface, the default ReflectWith() implementation cannot handle this.");
}
interfaces.First.Value.TryGetTarget(out Type interf);
//problem: the interfaces list has weak references that could have expired already
FieldInfo[] fields = clazz.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.DeclaredOnly);
try
{
for (int i = 0; i < fields.Length; i++)
{
FieldInfo f = fields[i];
if (f.IsStatic)
{
continue;
}
reflector.Reflect(interf, f.Name, f.GetValue(this));
}
}
catch (Exception e) when(e.IsIllegalAccessException())
{
// this should never happen, because we're just accessing fields
// from 'this'
throw RuntimeException.Create(e);
}
}
/// <summary>
/// This method is for introspection of attributes, it should simply
/// add the key/values this attribute holds to the given <see cref="IAttributeReflector"/>.
///
/// <para/>The default implementation calls <see cref="IAttributeReflector.Reflect(Type, string, object)"/> for all
/// non-static fields from the implementing class, using the field name as key
/// and the field value as value. The <see cref="IAttribute"/> class is also determined by Reflection.
/// Please note that the default implementation can only handle single-Attribute
/// implementations.
///
/// <para/>Custom implementations look like this (e.g. for a combined attribute implementation):
/// <code>
/// public void ReflectWith(IAttributeReflector reflector)
/// {
/// reflector.Reflect(typeof(ICharTermAttribute), "term", GetTerm());
/// reflector.Reflect(typeof(IPositionIncrementAttribute), "positionIncrement", GetPositionIncrement());
/// }
/// </code>
///
/// <para/>If you implement this method, make sure that for each invocation, the same set of <see cref="IAttribute"/>
/// interfaces and keys are passed to <see cref="IAttributeReflector.Reflect(Type, string, object)"/> in the same order, but possibly
/// different values. So don't automatically exclude e.g. <c>null</c> properties!
/// </summary>
/// <seealso cref="ReflectAsString(bool)"/>
public virtual void ReflectWith(IAttributeReflector reflector) // LUCENENET NOTE: This method was abstract in Lucene
{
Type clazz = this.GetType();
LinkedList <WeakReference <Type> > interfaces = AttributeSource.GetAttributeInterfaces(clazz);
if (interfaces.Count != 1)
{
throw new NotSupportedException(clazz.Name + " implements more than one Attribute interface, the default ReflectWith() implementation cannot handle this.");
}
interfaces.First.Value.TryGetTarget(out Type interf);
//problem: the interfaces list has weak references that could have expired already
FieldInfo[] fields = clazz.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.DeclaredOnly);
try
{
for (int i = 0; i < fields.Length; i++)
{
FieldInfo f = fields[i];
if (f.IsStatic)
{
continue;
}
reflector.Reflect(interf, f.Name, f.GetValue(this));
}
}
catch (MemberAccessException e)
{
throw new Exception(e.ToString(), e);
}
}
