| /* |
| * Copyright 1996-2011 Niclas Hedhman. |
| * |
| * 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. |
| */ |
| package org.apache.zest.library.alarm; |
| |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import org.apache.zest.api.constraint.Constraint; |
| import org.apache.zest.api.constraint.ConstraintDeclaration; |
| import org.apache.zest.api.constraint.Constraints; |
| |
| /** |
| * The definition of the format of AlarmPoint system names. |
| * <p> |
| * AlarmPoint Names must contain characters. The default is 5 characters but can possibly be overridden. It must also |
| * not only contain white spaces. |
| * |
| * |
| * To override the default minimumLength, specify the <b>minimumLength</b> value in the annotation, such as; |
| * </p> |
| * <pre><code> |
| * |
| * public interface ExpressiveAlarm extends AlarmPoint |
| * { |
| * @AlarmNameFormat(minimumLength=25) |
| * Property<String> systemName(); |
| * } |
| * </code></pre> |
| * <p> |
| * The obvious downside is that the Property become publicly visible to the users of AlarmPoint. |
| * </p> |
| */ |
| @ConstraintDeclaration |
| @Retention( RetentionPolicy.RUNTIME ) |
| @Constraints( AlarmNameFormat.AlarmNameConstraint.class ) |
| public @interface AlarmNameFormat |
| { |
| int minimumLength() default 5; |
| |
| class AlarmNameConstraint |
| implements Constraint<AlarmNameFormat, String> |
| { |
| @Override |
| public boolean isValid( AlarmNameFormat annotation, String value ) |
| { |
| int length = annotation.minimumLength(); |
| if( length < 1 ) |
| { |
| length = 1; |
| } |
| String trimmed = value.trim(); |
| boolean lengthConstraint = trimmed.length() >= length; |
| boolean whiteSpaceConstraint = trimmed.length() > 0; |
| return lengthConstraint && whiteSpaceConstraint; |
| } |
| } |
| } |