Add a new argument with the given name, value, and metadata.
Parameters: name - the name of the argument Parameters: value - the value of the argument Parameters: metadata - the metadata for the argument
Get a single argument.
Parameters: row - the index of the argument to return. the argument at the specified index, or null if no argumentexists at that index.
Get the arguments as a Map. Each argument name is used as the key, and
its value as the value.
a new Map with String keys and values containing the arguments