| 1 | /** |
| 2 | * |
| 3 | * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com> |
| 4 | * |
| 5 | * ==================================================================== |
| 6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | * you may not use this file except in compliance with the License. |
| 8 | * You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, software |
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | * See the License for the specific language governing permissions and |
| 16 | * limitations under the License. |
| 17 | * ==================================================================== |
| 18 | */ |
| 19 | package org.jclouds.predicates; |
| 20 | |
| 21 | import com.google.common.base.Predicate; |
| 22 | |
| 23 | import javax.annotation.Nullable; |
| 24 | |
| 25 | /** |
| 26 | * Abstract class that creates a bridge between {@link com.google.common.base.Predicate} |
| 27 | * and {@link org.jclouds.rest.annotations.ParamValidators}s. |
| 28 | * |
| 29 | * @param <T> Type of object to be validated. For generic |
| 30 | * validation (where object's class is determined in {@link #validate(Object)}, |
| 31 | * use {@link Object}. |
| 32 | * |
| 33 | * @see com.google.common.base.Predicate |
| 34 | * |
| 35 | * @author Oleksiy Yarmula |
| 36 | */ |
| 37 | public abstract class Validator<T> implements Predicate<T> { |
| 38 | |
| 39 | @Override |
| 40 | public boolean apply(@Nullable T t) { |
| 41 | validate(t); |
| 42 | return true; // by contract, if no exception thrown |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * Validates the parameter |
| 47 | * @param t parameter to be validated |
| 48 | * @throws IllegalArgumentException if validation failed |
| 49 | */ |
| 50 | public abstract void validate(@Nullable T t) throws IllegalArgumentException; |
| 51 | } |