001    package org.apache.fulcrum.intake.validator;
002    
003    /*
004     * Licensed to the Apache Software Foundation (ASF) under one
005     * or more contributor license agreements.  See the NOTICE file
006     * distributed with this work for additional information
007     * regarding copyright ownership.  The ASF licenses this file
008     * to you under the Apache License, Version 2.0 (the
009     * "License"); you may not use this file except in compliance
010     * with the License.  You may obtain a copy of the License at
011     *
012     *   http://www.apache.org/licenses/LICENSE-2.0
013     *
014     * Unless required by applicable law or agreed to in writing,
015     * software distributed under the License is distributed on an
016     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017     * KIND, either express or implied.  See the License for the
018     * specific language governing permissions and limitations
019     * under the License.
020     */
021    
022    /**
023     * A constraint has a name and a value and an optional message.
024     * The name/value pair will have meaning to a Validator and the
025     * message will serve as an error message in the event the Validator
026     * determines the constraint is violated.
027     * example:
028     * name="maxLength"
029     * value="255"
030     * message="Value cannot be longer than 255 characters."
031     *
032     * @author <a href="mailto:jmcnally@collab.net">John McNally</a>
033     * @version $Id: Constraint.java 535465 2007-05-05 06:58:06Z tv $
034     */
035    public interface Constraint
036    {
037        /**
038         * Get the name of the constraint.
039         */
040        String getName();
041    
042        /**
043         * Get the value of the constraint.
044         */
045        String getValue();
046    
047        /**
048         * Get the error message.
049         */
050        String getMessage();
051    }