Gary Gregory created LOG4J2-1932:
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             Summary: Add containsKey() method to class 
org.apache.logging.log4j.message.MapMessage
                 Key: LOG4J2-1932
                 URL: https://issues.apache.org/jira/browse/LOG4J2-1932
             Project: Log4j 2
          Issue Type: New Feature
            Reporter: Gary Gregory
            Assignee: Gary Gregory


Add the method {{containsKey()}} method to class 
{{org.apache.logging.log4j.message.MapMessage}} which delegates to the 
underlying data:

{code:java}
    /**
     * Retrieve the value of the element with the specified key or null if the 
key is not present.
     * @param key The name of the element.
     * @return The value of the element or null if the key is not present.
     */
    public String get(final String key) {
        return data.getValue(key);
    }
{code}




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