Dictionary objectModel and returns a Map object with values used in subsequent sitemap substitution patterns. NOTE: This interface is designed so that implentations can be ThreadSafe. When an action is ThreadSafe, only one instance serves all requests : this reduces memory usage and avoids pooling.
@param resolver The SourceResolver in charge
@param objectModel The Map with object of thecalling environment which can be used to select values this controller may need (ie Request, Response).
@param source A source String to the Action
@param parameters The Parameters for this invocation
@return Map The returned Map object withsitemap substitution values which can be used in subsequent elements attributes like src= using a xpath like expression: src="mydir/{myval}/foo" If the return value is null the processing inside the element of the sitemap will be skipped.
@exception Exception Indicates something is totally wrong
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