Parameters	Properties	Methods	Queries	Indices	ForeignKeys	Triggers
1	11	33

Properties
%Location	AtEnd	Id	LastModified	LineTerminator
RemoveOnClose	Size

Methods
%%OIDGet	%AddToSaveSet	%CheckUnique	%ClassIsLatestVersion
%ClassName	%ConstructClone	%Delete	%DeleteExtent
%DeleteId	%DispatchClassMethod	%DispatchGetModified	%DispatchGetProperty
%DispatchMethod	%DispatchSetModified	%DispatchSetMultidimProperty	%DispatchSetProperty
%Exists	%ExistsId	%Extends	%GetParameter
%GetSwizzleObject	%Id	%IsA	%IsModified
%KillExtent	%LocationSet	%LockStream	%New
%NormalizeObject	%ObjectModified	%Oid	%Open
%OpenId	%OriginalNamespace	%PackageName	%ReleaseLock
%Reload	%RemoveFromSaveSet	%RollBack	%Save
%SerializeObject	%SetModified	%UnlockStream	%ValidateObject
Clear	CopyFrom	CopyFromAndSave	FindAt
Flush	InputFromDevice	IsCharacter	IsNull
LastModifiedGet	MoveTo	MoveToEnd	OutputToDevice
OutputToDeviceAt	Read	ReadLine	ReadLineIntoStream
ReadSQL	Rewind	SerializeToSyncSet	SizeGet
StreamOIDIsNull	SyncStreamIn	Write	WriteLine

Subclasses
%Stream.GlobalCharacter	%Stream.TmpBinary

• parameter BUFFERLEN = 32656;

Number of characters that we are storing in each global node

• property LineTerminator as %String(MAXLEN=10) [ InitialExpression = $char(13,10),Transient ];

Type of line terminator we use for this stream, defaults to Cr/Lf. Maximum length is 10 characters.

• property RemoveOnClose as %Boolean [ InitialExpression = 0,Transient ];

If true then remove the permanent global as well as any temp global when this object is closed

• classmethod %Exists(soid As %ObjectIdentity) as %Boolean

Checks to see if the object identified by the OID oid exists in the extent.

Returns %Boolean TRUE is it exists, FALSE if it does not.

• method %IsModified() as %Integer

Returns true (1) if a property of this instance has been modified, otherwise false (0). A TRUE result does not necessarily mean that any property has actually been changed. If %IsModified() returns false then the object has not been modified. There are some situations where we simply cannot efficiently detect a change in value. In these cases we will set the modified status of the property.

• method %NormalizeObject() as %Status

Normalizes all of an object's property values by invoking the data type Normalize methods. Many data types may allow many different representations of the same value. Normalization converts a value to its cannonical, or normalized, form.

• method %ObjectModified() as %Integer

This method is somewhat similar to %IsModified but it also checks to see if swizzled references would cause the object to become modified should they be serialized. This works on the assumption that a reference to a persistent object will never be modified if the ID has already been assigned. For references to serial objects, a call to %ObjectModified indicates whether or not the serialized value is different. If the reference to a swizzled object is different from the initial object state then the $$$objModAll macro will already return true. Reference the Set code. Returns true (1) if this instance has been modified, otherwise false (0).

• method %ValidateObject(force As %Integer = 0) as %Status

This method validates an object. The %Save method of a persistent class calls it before filing any objects in the database. The %ValidateObject method of a referencing object can call it. You can also call it explicitly at any time.

%ValidateObject does the following:

1. It tests if any required property values are missing.
2. If the PROPERTYVALIDATION class parameter is set to ValidateOnSave, it validates each non-null property value by calling the property method IsValid on each literal property and the object's %ValidateObject method for object-valued properties.
3. If present, it will call a user-supplied %OnValidateObject method.

If any of these tests fail, %ValidateObject immediately returns an error value. It is up to the caller of %ValidateObject to process the error value.

Returns a %Status value indicating success or failure.

• method Clear(permanent As %Boolean = 1) as %Status

Clear the contents of this Stream from permanent storage. This will remove the permanent stream storage and any temporary stream and initialise the stream to its initial state that it starts in, including removing all the stream attributes.

Returns a %Status value indicating success or failure.

• method CopyFrom(source As %Stream.Object) as %Status

Copies the contents of source into this Stream.

For example, you can copy oldstream into a new stream:

	Set newstream=##class(%GlobalCharacterStream).%New()
	Do newstream.CopyFrom(oldstream)

Returns a %Status value indicating success or failure.

• method Flush() as %Status

Flush any output in the stream not already saved.

• method IsNull() as %Boolean

Returns true if this is a "NULL" stream; that is, a stream which has never been written to and saved. This is used by the Caché ODBC server.

• final method LastModifiedGet() as %TimeStamp

This is a Get accessor method for the LastModified property.

• method MoveToEnd() as %Status

Move to the end of the stream so the next Write will be appended to the end. This allows you to read from a stream, then MoveToEnd() and append new data, where just calling Write after a read will clear the stream before writing new data.

Returns a %Status value indicating success or failure.

• method OutputToDevice(ByRef len As %Integer = -1) as %Status

Write out len characters of the stream to the current device starting from the current position. This method is optimised for performance by the various sub classes. If len is omitted or set to -1 then it will write out the entire stream starting at the beginning.

• method Read(ByRef len As %Integer = 32000, ByRef sc As %Status) as %CacheString

Reads up to len characters from the current position in the stream. The current position is advanced by the number of characters read. Upon exit, len is set to the actual number of characters read. If a read occurs when the stream position is at the end of the stream, len will be set to -1 and Read will return a null string ("").

You must call Rewind if you want to read a stream from the beginning again. Calling Read after Write implicitly ends the Write operation and rewinds to the start of the stream.

Returns a string up to len characters long. The byref argument sc will return a %Status if any error occurred during the read.

• method ReadLine(ByRef len As %Integer = 32000, ByRef sc As %Status, ByRef eol As %Boolean) as %CacheString

Read a line from the stream. This will look for the line terminator in the stream and once it finds the terminator it will return the string minus the terminator character/s. If it reaches the end of the stream before it finds a terminator it will return the data it has so far, and if you specify a maximum size in len it will only read up to this number of characters. On exit len will contain the actual number of characters read. The byref argument sc will return a %Status if any error occured during the read and the byref argument eol is true if it found the line terminator and false otherwise. So for example you can read in a stream a line at a time and output the results to the current device with:

	While 'stream.AtEnd { Write stream.ReadLine(,.sc,.eol) If $$$ISERR(sc) { Write "ERROR" Quit } If eol { Write ! } }

• method ReadLineIntoStream(ByRef sc As %Status) as %Stream.Object

This reads from the stream until it find the LineTerminator and returns this as a stream. If the stream does not contain the line terminator this can potentially be the entire stream.

• method Rewind() as %Status

Go back to the start of the stream.

• method SizeGet() as %Integer

Return the current size of the data stream.

• classmethod StreamOIDIsNull(soid As %ObjectIdentity) as %Boolean

Return true if this stream oid is a null stream and false if the stream is not null

• method Write(data As %CacheString = "") as %Status

Appends the string data to the stream and advances the current stream position by the number of characters in data.

Note that a write operation immediately following a read or rewind will clear out the existing data in the stream.

Returns a %Status value indicating success or failure.

• method WriteLine(data As %CacheString = "") as %Status

Appends the string data along with a line terminator to the stream and advances the current stream position by the number of characters in data plus the line terminator.

Returns a %Status value indicating success or failure.