Common interface for query build
Linked list with a capacity to handle undo/redo actions.
Smart query providing all the needed methods for UI interaction that will make it possible to build a query adding clauses step by step.
Also defines the abstract class
implements this interface: it provides getters and setters needed for JSF
interactions when constructing a query part by part, e.g adding criterion to
an existing query string.
HistoryList is useful for undo operations.
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