Source Code Cross Referenced for NotEmpty.java in  » Database-ORM » Velosurf » velosurf » validation » Java Source Code / Java DocumentationJava Source Code and Java Documentation

01:        /*
02:         * Copyright 2003 The Apache Software Foundation.
03:         *
04:         * Licensed under the Apache License, Version 2.0 (the "License");
05:         * you may not use this file except in compliance with the License.
06:         * You may obtain a copy of the License at
07:         *
08:         *     http://www.apache.org/licenses/LICENSE-2.0
09:         *
10:         * Unless required by applicable law or agreed to in writing, software
11:         * distributed under the License is distributed on an "AS IS" BASIS,
12:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13:         * See the License for the specific language governing permissions and
14:         * limitations under the License.
15:         */
16:
17:        package velosurf.validation;
18:
19:        import java.util.Locale;
20:
21:        /**
22:         * <p>A "not empty" constraint. Syntax is:</p>
23:         *  <pre>
24:         *    &lt;<i>column</i> not-empty="true"/&gt;
25:         *  </pre>
26:         *<p>Or:</p>
27:         * <pre>  &lt;<i>column</i>&gt;
28:         *     &lt;not-empty [message="<i>error-message</i>"]/&gt;
29:         *   &lt;/<i>column</i>&gt;</pre>
30:         * <p>Note: this constraint is not meant to replace an internal SQL clause in the database,
31:         * since it cannot be made sure that complex updates will respect this constraint.</p>
32:         *
33:         *  @author <a href="mailto:claude.brisson@gmail.com">Claude Brisson</a>
34:         */
35:        public class NotEmpty extends FieldConstraint {
36:
37:            /**
38:             * Default constructor.
39:             */
40:            public NotEmpty() {
41:                setMessage("field {0} cannot be empty");
42:            }
43:
44:            /**
45:             * Validate datea against this constraint.
46:             * @param data the data to be validated
47:             * @return true if data is not null and not empty
48:             */
49:            public boolean validate(Object data) {
50:                return data != null && data.toString().length() > 0;
51:            }
52:
53:            /**
54:             * return a string representation for this constraint.
55:             * @return string
56:             */
57:            public String toString() {
58:                return "not-empty";
59:            }
60:        }