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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   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 .
+ */
+
+#ifndef __com_sun_star_form_validation_XValidator_idl__
+#define __com_sun_star_form_validation_XValidator_idl__
+
+#include <com/sun/star/uno/XInterface.idl>
+#include <com/sun/star/lang/NullPointerException.idl>
+
+
+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 XValidityConstraintListener.
+
+    @see XValidatable
+*/
+interface XValidator : com::sun::star::uno::XInterface
+{
+    /** determines whether the given value is valid
+
+    @param Value
+        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 Value
+        the value which has been recognized as being invalid
+    @return
+        a human-readable string, which explains why the given value is considered invalid.
+    */
+    string explainInvalid( [in] any Value );
+
+    /** registers the given validity listener.
+
+    <p>Usually, an XValidatable 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 constraints should simply ignore this
+    call.</p>
+
+    @throws com::sun::star::lang::NullPointerException
+        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 com::sun::star::lang::NullPointerException
+        if the given listener is `NULL`
+    @see XValidityConstraintListener
+    */
+    void    removeValidityConstraintListener( [in] XValidityConstraintListener Listener )
+                raises( com::sun::star::lang::NullPointerException );
+};
+
+
+}; }; }; }; };
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */