1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF 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.eclipse.aether.spi.validator;
20
21 import org.eclipse.aether.RepositorySystemSession;
22
23 /**
24 * A factory to create validators.
25 *
26 * @since 2.0.8
27 */
28 public interface ValidatorFactory {
29
30 /**
31 * The no-op (does not validate anything) instance of validator.
32 *
33 * @since 2.0.22
34 */
35 Validator NOOP = new Validator() {};
36
37 /**
38 * Creates a new validator for the session, or {@link #NOOP} to abstain from validation. Factory is consulted
39 * once per session (if cache present in session) and returned instances are cached and reused
40 * across single session.
41 *
42 * @param session the repository system session from which to configure the validator, must not be {@code null}.
43 * @return the validator to be used for the session, or {@link #NOOP} to abstain from validation, never {@code null}.
44 */
45 Validator newInstance(RepositorySystemSession session);
46 }