Page last modified 14:35, 28 May 2018 by villes

->sum()

    Table of contents
    1. 1. Description of the method
    2. 2.  
    3. 3. Example

    Description of the method

     

    Description: ->sum() method returns the sum of all the elements in the container that supports the "+"-operation, e.g. integer.
    Available for: integer, real 
    Parameters: -
    Return type: integer, real

     

    Example

    Context: Message
    OCL: self.Transaction.Amount->sum() = 100
    Description: The example sums every transaction amount in the message if the amounts are valid type and compares them to the integer. If the sum is 100, true will be returned.

     

    The XML snippet below would pass this check.

    <?xml version="1.0" encoding="UTF-8"?>

    <Message xmlns="http://www.XMLdation.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
      <Header>
        <Id>a</Id>
        <TimeStamp>2018-05-28T12:17:50</TimeStamp>
        <ControlSum>2</ControlSum>
        <NumberOfTransactions>1</NumberOfTransactions>
      </Header>
      <Transaction>
        <Id>TransactionId1</Id>
        <Amount>50</Amount>
        <Debtor>
          <Name>Debtor1</Name>
        </Debtor>
        <Creditor>
          <Name>Creditor1</Name>
        </Creditor>
      </Transaction>
      <Transaction>
        <Id>TransactionId2</Id>
        <Amount>50</Amount>
        <Debtor>
          <Name>Debtor2</Name>
        </Debtor>
        <Creditor>
          <Name>Creditor2</Name>
        </Creditor>
      </Transaction>
    </Message>

    The other snippet below however would not pass this check. (The sum of transaction amounts is more than 100)

    <?xml version="1.0" encoding="UTF-8"?>

    <Message xmlns="http://www.XMLdation.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
      <Header>
        <Id>a</Id>
        <TimeStamp>2018-05-28T12:17:50</TimeStamp>
        <ControlSum>2</ControlSum>
        <NumberOfTransactions>1</NumberOfTransactions>
      </Header>
      <Transaction>
        <Id>TransactionId1</Id>
        <Amount>100</Amount>
        <Debtor>
          <Name>Debtor1</Name>
        </Debtor>
        <Creditor>
          <Name>Creditor1</Name>
        </Creditor>
      </Transaction>
      <Transaction>
        <Id>TransactionId2</Id>
        <Amount>50</Amount>
        <Debtor>
          <Name>Debtor2</Name>
        </Debtor>
        <Creditor>
          <Name>Creditor2</Name>
        </Creditor>
      </Transaction>
    </Message>
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