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 }