Package org.apache.tomcat.websocket
Interface Transformation
- All Known Implementing Classes:
- PerMessageDeflate
public interface Transformation
The internal representation of the transformation that a WebSocket extension performs on a message.
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Method SummaryModifier and TypeMethodDescriptionvoidclose()Clean-up any resources that were used by the transformation.Obtain the extension that describes the information to be returned to the client.getMoreData(byte opCode, boolean fin, int rsv, ByteBuffer dest) Obtain more input data.List<org.apache.tomcat.websocket.MessagePart>sendMessagePart(List<org.apache.tomcat.websocket.MessagePart> messageParts) Takes the provided list of messages, transforms them, passes the transformed list on to the next transformation (if any) and then returns the resulting list of message parts after all of the transformations have been applied.voidSets the next transformation in the pipeline.booleanvalidateRsv(int rsv, byte opCode) Validates the RSV and opcode combination (assumed to have been extracted from a WebSocket Frame) for this extension.booleanvalidateRsvBits(int i) Validate that the RSV bit(s) required by this transformation are not being used by another extension.
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Method Details- 
setNextSets the next transformation in the pipeline.- Parameters:
- t- The next transformation
 
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validateRsvBitsboolean validateRsvBits(int i) Validate that the RSV bit(s) required by this transformation are not being used by another extension. The implementation is expected to set any bits it requires before passing the set of in-use bits to the next transformation.- Parameters:
- i- The RSV bits marked as in use so far as an int in the range zero to seven with RSV1 as the MSB and RSV3 as the LSB
- Returns:
- trueif the combination of RSV bits used by the transformations in the pipeline do not conflict otherwise- false
 
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getExtensionResponseExtension getExtensionResponse()Obtain the extension that describes the information to be returned to the client.- Returns:
- The extension information that describes the parameters that have been agreed for this transformation
 
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getMoreDataTransformationResult getMoreData(byte opCode, boolean fin, int rsv, ByteBuffer dest) throws IOException Obtain more input data.- Parameters:
- opCode- The opcode for the frame currently being processed
- fin- Is this the final frame in this WebSocket message?
- rsv- The reserved bits for the frame currently being processed
- dest- The buffer in which the data is to be written
- Returns:
- The result of trying to read more data from the transform
- Throws:
- IOException- If an I/O error occurs while reading data from the transform
 
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validateRsvboolean validateRsv(int rsv, byte opCode) Validates the RSV and opcode combination (assumed to have been extracted from a WebSocket Frame) for this extension. The implementation is expected to unset any RSV bits it has validated before passing the remaining RSV bits to the next transformation in the pipeline.- Parameters:
- rsv- The RSV bits received as an int in the range zero to seven with RSV1 as the MSB and RSV3 as the LSB
- opCode- The opCode received
- Returns:
- trueif the RSV is valid otherwise- false
 
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sendMessagePartList<org.apache.tomcat.websocket.MessagePart> sendMessagePart(List<org.apache.tomcat.websocket.MessagePart> messageParts) throws IOException Takes the provided list of messages, transforms them, passes the transformed list on to the next transformation (if any) and then returns the resulting list of message parts after all of the transformations have been applied.- Parameters:
- messageParts- The list of messages to be transformed
- Returns:
- The list of messages after this any any subsequent transformations have been applied. The size of the returned list may be bigger or smaller than the size of the input list
- Throws:
- IOException- If an error occurs during the transformation of the message parts
 
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closevoid close()Clean-up any resources that were used by the transformation.
 
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