/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/



#ifndef __com_sun_star_form_validation_XValidator_idl__
#define __com_sun_star_form_validation_XValidator_idl__

#ifndef __com_sun_star_uno_XInterface_idl__
#include <com/sun/star/uno/XInterface.idl>
#endif

#ifndef __com_sun_star_lang_NullPointerException_idl__
#include <com/sun/star/lang/NullPointerException.idl>
#endif

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

module com {  module sun {  module star {  module form { module validation {

interface XValidityConstraintListener;

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

/** specifies a component able to validate (the content of) other components

    <p>Validators support simple validity checks and retrieving justifications for
    invalidity.</p>

    <p>Validators may additionally support dynamic validity constraints. In such a case,
    the validity of a given value may change, without the value changing itself.<br/>
    To be notified about this, interested components should register as <type>XValidityConstraintListener</type>.

    @see XValidatable
*/
interface XValidator : com::sun::star::uno::XInterface
{
    /** determines whether the given value is valid

    @param aValue
        the value to check for validity
    @return
        <TRUE/> if and only if the value is considered valid.
    */
    boolean isValid( [in] any Value );

    /** retrieves a justification for the invalidity of the given value

    @param aValue
        the value which has been recognized as being invalid
    @return
        a human-readable string, which explains why the given valus is considered invalid.
    */
    string explainInvalid( [in] any Value );

    /** registers the given validity listener.

    <p>Usually, an <type>XValidatable</type> instance will also add itself as validity listener,
    as soon as the validator is introduced to it.</p>

    <p>Implementations which do not support dynamic validity contraints should simply ignore this
    call.</p>

    @throws <type scope="com::sun::star::lang">NullPointerException</type>
        if the given listener is <NULL/>
    @see XValidityConstraintListener
    */
    void    addValidityConstraintListener( [in] XValidityConstraintListener Listener )
                raises( com::sun::star::lang::NullPointerException );

    /** revokes the given validity listener

    @throws <type scope="com::sun::star::lang">NullPointerException</type>
        if the given listener is <NULL/>
    @see XValidityConstraintListener
    */
    void    removeValidityConstraintListener( [in] XValidityConstraintListener Listener )
                raises( com::sun::star::lang::NullPointerException );
};

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

}; }; }; }; };

#endif