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#ifndef __offapi_com_sun_star_form_runtime_XFilterController_idl__
#define __offapi_com_sun_star_form_runtime_XFilterController_idl__

#include <com/sun/star/awt/XControl.idl>
#include <com/sun/star/lang/IndexOutOfBoundsException.idl>

//=============================================================================

module com { module sun { module star { module form { module runtime {

//=============================================================================

interface XFilterControllerListener;

/** provides access to a form based filter for a database form

    <p>In a form based filter, form controls bound to a searchable database field are replaced with a control
    which allows entering a search expression. This so-called <em>predicate expression</em> is basically a part of an
    SQL <code>WHERE</code> clause, but without the the part denoting the database column. For instance, if you
    have a form control bound to a table column named <code>Name</code>, then entering the string
    <q>LIKE '%Smith%'</q> effectively consitutes a SQL <code>WHERE</code> clause <code>"Name" LIKE '%Smith%'</code>.</p>

    <p>In the actual document view, there are usually some relaxations to this. For instance, keywords such as
    <code>LIKE</code> might be localized, according to OpenOffice.org's UI locale. Also, for an equality criterion,
    the equality sign <code>=</code> is usually omitted. However, this interface here provides programmatic access
    to the form based filter, so those relaxations are not considered here.</p>

    <p>The filter maintained by a filter controller is, logically, a disjunctive normal form of an SQL <code>WHERE</code>
    class. That is, it is a disjunction of <em>m</em> terms, where each term is a conjunction of <em>n</em> clauses
    of the form <code>&lt;column&gt; &lt;predicate&gt; &lt;literal&gt;</code> or of the form <code><em>&lt;column&gt;
    IS [NOT] NULL</em></code>.</p>

    <p><em>n</em> equals the number of filter controls which the filter controller is responsible for. This number
    doesn't change during one session of the form based filter. On the other hand, <em>m</em>, the number of disjunctive
    terms, is dynamic.</p>

    <a name="active_term"></a>
    <p>With the above, there are potentially <em>m * n</em> <em>predicate expressions</em> (though usually only a fraction
    of those will actually exist). Since in a form based filter, there are only <em>n</em> filter controls, and each
    filter control displays exactly one <em>predicate expression</em>, this means that only a part of the complete
    filter can be displayed, in particular, only one <em>disjunctive term</em> can be displayed at a time. Thus,
    the filter controller knows the concept of an <em>active term</em>, denoted by the <member>ActiveTerm</member>
    attribute, controls which of the terms is currently displayed in the form controls.</p>

    @see XFormController
    @see com::sun::star::sdbc::XResultSetMetaData::isSearchable
    @see com::sun::star::sdb::XSingleSelectQueryAnalyzer::getStructuredFilter
    @see com::sun::star::sdb::SQLFilterOperator

    @since OpenOffice.org 3.3
 */
interface XFilterController
{
    /** registers a listener to be notified of certain changes in the form based filter.

        <p>Registering the same listener multiple times results in multiple notifications of the same event,
        and also requires multiple revocations of the listener.
    */
    void    addFilterControllerListener( [in] XFilterControllerListener _Listener );

    /** revokes a listener which was previously registered to be notified of certain changes in the form based filter.
    */
    void    removeFilterControllerListener( [in] XFilterControllerListener _Listener );

    /** is the number of <em>filter components</em>, or filter controls, which the filter controller is responsible
        for.

        <p>This number is constant during one session of the form based filter.</p>
    */
    [attribute, readonly]   long    FilterComponents;

    /** is the number of <em>disjunctive terms</em> of the filter expression represented by the form based filter.
    */
    [attribute, readonly]   long    DisjunctiveTerms;

    /** denotes the <a href="#active_term"><em>active term</em></a> of the filter controller.
    */
    [attribute] long    ActiveTerm
    {
        set raises ( ::com::sun::star::lang::IndexOutOfBoundsException );
    };

    /** sets a given <em>predicate expression</em>

        @param _Component
            denotes the filter component whose expression is to be set. Must be greater than or equal to 0, and smaller than
            <member>FilterComponents</member>.

        @param _Term
            denotes the <em>disjunctive term</em> in which the expression is to be set. Must be greater than or equal to 0,
            and smaller than <member>DisjunctiveTerms</member>.

        @param _PredicateExpression
            denotes the <em>predicate expression</em> to set for the given filter component in the given term.

        @throws ::com::sun::star::lang::IndexOutOfBoundsException
            if one of the indexes is out of the allowed range
    */
    void
        setPredicateExpression( [in] long _Component, [in] long _Term, [in] string _PredicateExpression )
            raises( ::com::sun::star::lang::IndexOutOfBoundsException );

    /** retrieves the filter component with the given index.

        <p>The filter control has the same control model as the control which it stands in for. Consequently, you can use this method
        to obtain the database column which the filter control works on, by examining the control model's <code>BoundField</code>
        property.</p>

        @param _Component
            denotes the index of the filter component whose control should be obtained. Must be greater than or equal to 0,
            and smaller than <member>FilterComponents</member>.

        @throws ::com::sun::star::lang::IndexOutOfBoundsException
            if <arg>_Component</arg> is out of the allowed range.

        @see ::com::sun::star::form::component::DataAwareControlModel::BoundField
    */
    ::com::sun::star::awt::XControl
        getFilterComponent( [in] long _Component )
            raises( ::com::sun::star::lang::IndexOutOfBoundsException );

    /** retrieves the entirety of the <em>predicate expressions</em> represented by the filter controller.

        <p>Each element of the returned sequence is a <em>disjunctive term</em>, having exactly <member>FilterComponents</member>
        elements, which denote the single <em>predicate expressions</em> of this term.</p>
    */
    sequence< sequence< string > >
        getPredicateExpressions();

    /** removes a given <em>disjunctive term</em>

        @param _Term
            the index of the term to remove. Must be greater than or equal to 0, and smaller than
            <member>DisjunctiveTerms</member>.

        @throws ::com::sun::star::lang::IndexOutOfBoundsException
            if <arg>_Term</arg> is out of the allowed range.
    */
    void
        removeDisjunctiveTerm( [in] long _Term )
            raises( ::com::sun::star::lang::IndexOutOfBoundsException );

    /** appends an empty disjunctive term to the list of terms.
    */
    void
        appendEmptyDisjunctiveTerm();
};

//=============================================================================

}; }; }; }; };

//=============================================================================

#endif
