/// <summary>
/// This is overridden to allow proper comparison of property objects
/// </summary>
/// <param name="obj">The object to which this instance is compared</param>
/// <returns>Returns true if the object equals this instance, false if it does not</returns>
public override bool Equals(object obj)
{
BaseProperty bp = obj as BaseProperty;
if (bp == null)
{
return(false);
}
// The ToString() method returns a text representation of the property based on all of its settings
// so it's a reliable way to tell if two instances are the same.
return(this == bp || this.ToString() == bp.ToString());
}
/// <summary>
/// This is overridden to allow copying values from the specified PDI object into the instance
/// </summary>
/// <param name="p">The PDI object from which the settings are to be copied</param>
/// <remarks>Derived classes must call this method to copy the standard PDI object properties. It only
/// needs to be overridden if the derived class has additional properties.</remarks>
protected override void Clone(PDIObject p)
{
BaseProperty o = (BaseProperty)p;
if (o.Version != SpecificationVersions.None)
{
this.Version = o.Version;
}
this.Group = o.Group;
this.EncodingMethod = o.EncodingMethod;
this.CharacterSet = o.CharacterSet;
this.Language = o.Language;
this.ValueLocation = o.ValueLocation;
this.CustomParameters = o.CustomParameters;
this.Value = o.Value;
}
/// <summary>
/// This is a helper method that converts a property to its string form and writes it to the given text
/// writer.
/// </summary>
/// <param name="prop">The property to use.</param>
/// <param name="sb"><para>A <see cref="System.Text.StringBuilder"/> used by the property to convert
/// itself to a string. This is a shared instance used by all properties written to the text writer. It
/// is cleared before the specified property is converted.</para>
///
/// <para>It can be null if the TextWriter is a <see cref="System.IO.StringWriter"/>. In that case, the
/// property will append itself directly to its StringBuilder instead.</para></param>
/// <param name="tw">A <see cref="System.IO.TextWriter"/> to which the string form is written.</param>
/// <remarks>Properties use a StringBuilder to convert themselves to a string rather than writing
/// directly to the TextWriter as they may need to manipulate the string to fold lines, etc.</remarks>
/// <exception cref="InvalidCastException">This is thrown if the StringBuilder parameter is null and the
/// TextWriter is not a StringWriter.</exception>
public static void WriteToStream(BaseProperty prop, StringBuilder sb, TextWriter tw)
{
if (prop != null)
{
if (sb != null)
{
sb.Length = 0;
prop.ToString(sb);
if (sb.Length != 0)
{
tw.Write(sb.ToString());
}
}
else
{
prop.ToString(((StringWriter)tw).GetStringBuilder());
}
}
}
/// <summary>
/// This is a helper method that converts a property to its string form and writes it to the given text
/// writer.
/// </summary>
/// <param name="prop">The property to use.</param>
/// <param name="sb"><para>A <see cref="System.Text.StringBuilder"/> used by the property to convert
/// itself to a string. This is a shared instance used by all properties written to the text writer. It
/// is cleared before the specified property is converted.</para>
///
/// <para>It can be null if the TextWriter is a <see cref="System.IO.StringWriter"/>. In that case, the
/// property will append itself directly to its StringBuilder instead.</para></param>
/// <param name="tw">A <see cref="System.IO.TextWriter"/> to which the string form is written.</param>
/// <remarks>Properties use a StringBuilder to convert themselves to a string rather than writing
/// directly to the TextWriter as they may need to manipulate the string to fold lines, etc.</remarks>
/// <exception cref="InvalidCastException">This is thrown if the StringBuilder parameter is null and the
/// TextWriter is not a StringWriter.</exception>
public static void WriteToStream(BaseProperty prop, StringBuilder sb, TextWriter tw)
{
if(prop != null)
if(sb != null)
{
sb.Length = 0;
prop.ToString(sb);
if(sb.Length != 0)
tw.Write(sb.ToString());
}
else
prop.ToString(((StringWriter)tw).GetStringBuilder());
}
