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<!DOCTYPE erlref SYSTEM "erlref.dtd">
<erlref>
<header>
<copyright>
<year>2003</year><year>2013</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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</legalnotice>
<title>megaco_encoder</title>
<prepared>Micael Karlberg</prepared>
<responsible>Micael Karlberg</responsible>
<docno></docno>
<approved>Micael Karlberg</approved>
<checked></checked>
<date>2007-06-15</date>
<rev>%VSN%</rev>
<file>megaco_encoder.xml</file>
</header>
<module>megaco_encoder</module>
<modulesummary>Megaco encoder behaviour.</modulesummary>
<description>
<p>The following functions should be exported from a
<c><![CDATA[megaco_encoder]]></c> callback module:</p>
</description>
<section>
<title>DATA TYPES</title>
<code type="none"><![CDATA[
megaco_message() = #'MegacoMessage{}'
transaction() = {transactionRequest, transaction_request()} |
{transactionPending, transaction_reply()} |
{transactionReply, transaction_pending()} |
{transactionResponseAck, transaction_response_ack()} |
{segmentReply, segment_reply()}
transaction_request() = #'TransactionRequest'{}
transaction_pending() = #'TransactionPending'{}
transaction_reply() = #'TransactionReply'{}
transaction_response_ack() = [transaction_ack()]
transaction_ack() = #'TransactionAck'{}
segment_reply() = #'SegmentReply'{}
action_request() = #'ActionRequest'{}
action_reply() = #'ActionReply'{}
]]></code>
<marker id="encode_message"></marker>
</section>
<funcs>
<func>
<name>Module:encode_message(EncodingConfig, Version, Message) -> {ok, Bin} | Error</name>
<fsummary>Encode a megaco message.</fsummary>
<type>
<v>EncodingConfig = list()</v>
<v>Version = integer()</v>
<v>Message = megaco_message()</v>
<v>Bin = binary()</v>
<v>Error = term()</v>
</type>
<desc>
<p>Encode a megaco message.</p>
<marker id="decode_message"></marker>
</desc>
</func>
<func>
<name>Module:decode_message(EncodingConfig, Version, Bin) -> {ok, Message} | Error</name>
<fsummary>Decode a megaco message.</fsummary>
<type>
<v>EncodingConfig = list()</v>
<v>Version = integer() | dynamic</v>
<v>Message = megaco_message()</v>
<v>Bin = binary()</v>
<v>Error = term()</v>
</type>
<desc>
<p>Decode a megaco message. </p>
<p>Note that if the Version argument is <c><![CDATA[dynamic]]></c>, the
decoder should try to figure out the actual version from the
message itself and then use the proper decoder, e.g. version 1.
<br></br>If on the other hand the Version argument is an integer,
it means that this is the expected version of the message and
the decoder for that version should be used.</p>
<marker id="decode_mini_message"></marker>
</desc>
</func>
<func>
<name>Module:decode_mini_message(EncodingConfig, Version, Bin) -> {ok, Message} | Error</name>
<fsummary>Perform a minimal decode of a megaco message.</fsummary>
<type>
<v>EncodingConfig = list()</v>
<v>Version = integer() | dynamic</v>
<v>Message = megaco_message()</v>
<v>Bin = binary()</v>
<v>Error = term()</v>
</type>
<desc>
<p>Perform a minimal decode of a megaco message. </p>
<p>The purpose of this function is to do a minimal decode of
Megaco message. A successfull result is a <c><![CDATA['MegacoMessage']]></c>
in which only version and mid has been initiated. This function
is used by the megaco_messenger module when the
<c><![CDATA[decode_message/3]]></c> function fails to figure out the mid
(the actual sender) of the message.</p>
<p>Note again that a successfull decode only returns a
partially initiated message.</p>
<marker id="encode_transaction"></marker>
</desc>
</func>
<func>
<name>Module:encode_transaction(EncodingConfig, Version, Transaction) -> OK | Error</name>
<fsummary>Encode a megaco transaction.</fsummary>
<type>
<v>EncodingConfig = list()</v>
<v>Version = integer()</v>
<v>Transaction = transaction()</v>
<v>OK = {ok, Bin}</v>
<v>Bin = binary()</v>
<v>Error = {error, Reason}</v>
<v>Reason = not_implemented | OtherReason</v>
<v>OtherReason = term()</v>
</type>
<desc>
<p>Encode a megaco transaction. If this, for whatever reason,
is not supported, the function should return the error reason
<c>not_implemented</c>. </p>
<p>This functionality is used both when the transaction sender is
used and for segmentation. So, for either of those to work, this
function <em>must</em> be fully supported! </p>
<marker id="encode_action_requests"></marker>
</desc>
</func>
<func>
<name>Module:encode_action_requests(EncodingConfig, Version, ARs) -> OK | Error</name>
<fsummary>Encode megaco action requests.</fsummary>
<type>
<v>EncodingConfig = list()</v>
<v>Version = integer()</v>
<v>ARs = action_requests()</v>
<v>action_requests() = [action_request()]</v>
<v>OK = {ok, Bin}</v>
<v>Bin = binary()</v>
<v>Error = {error, Reason}</v>
<v>Reason = not_implemented | OtherReason</v>
<v>OtherReason = term()</v>
</type>
<desc>
<p>Encode megaco action requests. This function is called when
the user calls the function
<seealso marker="megaco#encode_actions">encode_actions/3</seealso>.
If that function is never used or if the codec cannot support this
(the encoding of individual actions), then return with error reason
<c>not_implemented</c>. </p>
<marker id="encode_action_reply"></marker>
</desc>
</func>
<func>
<name>Module:encode_action_reply(EncodingConfig, Version, AR) -> OK | Error</name>
<fsummary>Encode a megaco action reply.</fsummary>
<type>
<v>EncodingConfig = list()</v>
<v>Version = integer()</v>
<v>AR = action_reply()</v>
<v>OK = {ok, Bin}</v>
<v>Bin = binary()</v>
<v>Error = {error, Reason}</v>
<v>Reason = not_implemented | OtherReason</v>
<v>OtherReason = term()</v>
</type>
<desc>
<p>Encode a megaco action reply. If this, for whatever reason,
is not supported, the function should return the error reason
<c>not_implemented</c>. </p>
<p>This function is used when segmentation has been configured.
So, for this to work, this function <em>must</em> be fully
supported! </p>
</desc>
</func>
</funcs>
</erlref>
