C# Класс iTextSharp.xmp.XmpUtils

Alias without the new option deleteEmptyValues.

Append properties from one XMP object to another.

XMPUtils#appendProperties was created to support the File Info dialog's Append button, and has been been generalized somewhat from those specific needs. It appends information from one XMP object (source) to another (dest). The default operation is to append only external properties that do not already exist in the destination. The flag doAllProperties can be used to operate on all properties, external and internal. The flag replaceOldValues option can be used to replace the values of existing properties. The notion of external versus internal applies only to top level properties. The keep-or-replace-old notion applies within structs and arrays as described below.

• If replaceOldValues is true then the processing is restricted to the top level properties. The processed properties from the source (according to doAllProperties) are propagated to the destination, replacing any existing values.Properties in the destination that are not in the source are left alone.
• If replaceOldValues is not passed then the processing is more complicated. Top level properties are added to the destination if they do not already exist. If they do exist but differ in form (simple/struct/array) then the destination is left alone. If the forms match, simple properties are left unchanged while structs and arrays are merged.
• If deleteEmptyValues is passed then an empty value in the source XMP causes the corresponding destination XMP property to be deleted. The default is to treat empty values the same as non-empty values. An empty value is any of a simple empty string, an array with no items, or a struct with no fields. Qualifiers are ignored.

The detailed behavior is defined by the following pseudo-code:

 appendProperties ( sourceXMP, destXMP, doAllProperties,  replaceOldValues, deleteEmptyValues ): for all source schema (top level namespaces): for all top level properties in sourceSchema: if doAllProperties or prop is external: appendSubtree ( sourceNode, destSchema, replaceOldValues, deleteEmptyValues ) appendSubtree ( sourceNode, destParent, replaceOldValues, deleteEmptyValues ): if deleteEmptyValues and source value is empty: delete the corresponding child from destParent else if sourceNode not in destParent (by name): copy sourceNode's subtree to destParent else if replaceOld: delete subtree from destParent copy sourceNode's subtree to destParent else: // Already exists in dest and not replacing, merge structs and arrays if sourceNode and destNode forms differ: return, leave the destNode alone else if form is a struct: for each field in sourceNode: AppendSubtree ( sourceNode.field, destNode, replaceOldValues ) else if form is an alt-text array: copy new items by "xml:lang" value into the destination else if form is an array: copy new items by value into the destination, ignoring order and duplicates 

Note: appendProperties can be expensive if replaceOldValues is not passed and the XMP contains large arrays. The array item checking described above is n-squared. Each source item is checked to see if it already exists in the destination, without regard to order or duplicates.

Simple items are compared by value and "xml:lang" qualifier, other qualifiers are ignored. Structs are recursively compared by field names, without regard to field order. Arrays are compared by recursively comparing all items.

Create a single edit string from an array of strings.

Convert from boolean to string.

Convert from XMPDateTime to string.

Convert from long to string.

Convert from int to string.

Convert from long to string.

Convert from string to Boolean.

Converts a string value to an XMPDateTime.

Converts a string value to a double.

Converts a string value to an int.

Converts a string value to a long.

Decode from Base64 encoded string to raw data.

Convert from a byte array to a base64 encoded string.

Remove multiple properties from an XMP object. RemoveProperties was created to support the File Info dialog's Delete button, and has been been generalized somewhat from those specific needs. It operates in one of three main modes depending on the schemaNs and propName parameters:

• Non-empty schemaNs and propName - The named property is removed if it is an external property, or if the flag doAllProperties option is true. It does not matter whether the named property is an actual property or an alias.
• Non-empty schemaNs and empty propName - The all external properties in the named schema are removed. Internal properties are also removed if the flag doAllProperties option is set. In addition, aliases from the named schema will be removed if the flag includeAliases option is set.
• Empty schemaNs and empty propName - All external properties in all schema are removed. Internal properties are also removed if the flag doAllProperties option is passed. Aliases are implicitly handled because the associated actuals are internal if the alias is.

Separate a single edit string into an array of strings.

Private constructor