1 /**
2 * Licensed to jclouds, Inc. (jclouds) under one or more
3 * contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. jclouds licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. 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,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.jclouds.predicates;
20
21 import com.google.common.base.Predicate;
22
23 import org.jclouds.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 }