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eFaps is a framework used to map objects with or without attached files to a relational database and optional file systems (only for attaches files). Configurable access control can be provided down to object and attribute level depending on implementation and use case. Depending on requirements, events (like triggers) allow to implement business logic and to separate business logic from user interface. The framework includes integrations (e.g. webdav, full text search) and a web application as 'simple' configurable user interface. Some best practises, example web application modules (e.g. team work module) support administrators and implementers using this framework.

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/*
 * Copyright 2003 - 2011 The eFaps Team
 *
 * Licensed 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.
 *
 * Revision:        $Rev: 6210 $
 * Last Changed:    $Date: 2011-02-18 16:02:56 -0500 (Fri, 18 Feb 2011) $
 * Last Changed By: $Author: [email protected] $
 */

package org.efaps.admin.datamodel.ui;

import org.efaps.admin.datamodel.Attribute;
import org.efaps.util.EFapsException;

/**
 * Interface for all classes used to evaluate value for presentation in an user
 * interface.
 *
 * @author The eFaps Team
 * @version $Id: UIInterface.java 6210 2011-02-18 21:02:56Z [email protected] $
 */
public interface UIInterface
{
    /**
     * Used as a temporary tag inside html. It is used to set e.g. the id or add
     * javascript during the rendering;
     */
    String EFAPSTMPTAG = " eFapsTempTag ";

    /**
     * Method to get the Value for creation in an html document.
     *
     * @param _fieldValue Fieldvalue the representation is requested
     * @return String representation of the object for creation
     * @throws EFapsException on error
     */
    String getHiddenHtml(final FieldValue _fieldValue)
        throws EFapsException;

    /**
     * Method to get the Value for editing in an html document.
     *
     * @param _fieldValue Fieldvalue the representation is requested
     * @return String representation of the object for editing
     * @throws EFapsException on error
     */
    String getEditHtml(final FieldValue _fieldValue)
        throws EFapsException;

    /**
     * Method to get the Value for viewing in an html document.
     *
     * @param _fieldValue Fieldvalue the representation is requested
     * @return String representation of the object for viewing
     * @throws EFapsException on error
     */
    String getReadOnlyHtml(final FieldValue _fieldValue)
        throws EFapsException;

    /**
     * Method to get a String representation of the value. This is used e.g. for
     * labels. In comparison to the Html-Methods it should not contain html.
     *
     * @param _fieldValue Fieldvalue the representation is requested
     * @return String representation of the object for viewing
     * @throws EFapsException on error
     */
    String getStringValue(final FieldValue _fieldValue)
        throws EFapsException;

    /**
     * Method to get the Object for use in case of comparison.
     *
     * @param _fieldValue Fieldvalue the representation is requested
     * @return Object for comparison
     * @throws EFapsException on error
     */
    Object getObject4Compare(final FieldValue _fieldValue)
        throws EFapsException;

    /**
     * Method to compare the values.
     *
     * @param _fieldValue first Value
     * @param _fieldValue2 second Value
     * @return int
     * @throws EFapsException on error
     */
    int compare(final FieldValue _fieldValue,
                final FieldValue _fieldValue2)
        throws EFapsException;

    /**
     * Method is used to validate a string value given from an Userinterface.
     *
     * @param _value value to validate
     * @param _attribute Attribute the value is related to
     * @return if the given value is valid for this type null must be returned,
     *         else the message that will be shown to the user as a snipplet
     *         must be returned
     * @throws EFapsException on error
     */
    String validateValue(final String _value,
                         final Attribute _attribute)
        throws EFapsException;;

    /**
     * Method to format the given Object.
     *
     * @param _object the object to be formated
     * @param _pattern pattern to be used by the formatter
     * @return formated object
     * @throws EFapsException on error
     */
    Object format(final Object _object,
                  final String _pattern)
        throws EFapsException;
}