-
Notifications
You must be signed in to change notification settings - Fork 214
/
PolicySubstitutionStrategyRegistry.java
76 lines (64 loc) · 2.66 KB
/
PolicySubstitutionStrategyRegistry.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
/*
* Copyright (c) 2022 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.policies.service.enforcement.pre;
import java.util.LinkedList;
import java.util.List;
import java.util.Optional;
import javax.annotation.concurrent.Immutable;
import org.eclipse.ditto.base.model.signals.Signal;
import org.eclipse.ditto.policies.enforcement.placeholders.strategies.SubstitutionStrategy;
import org.eclipse.ditto.policies.enforcement.placeholders.strategies.SubstitutionStrategyRegistry;
/**
* Registry containing all of policy specific instances of {@link SubstitutionStrategy}.
*/
@Immutable
final class PolicySubstitutionStrategyRegistry implements SubstitutionStrategyRegistry {
private final List<SubstitutionStrategy<?>> strategies;
private PolicySubstitutionStrategyRegistry() {
strategies = List.copyOf(createStrategies());
}
public static PolicySubstitutionStrategyRegistry newInstance() {
return new PolicySubstitutionStrategyRegistry();
}
/**
* Get a matching strategy for handling the given {@code signal}.
*
* @param signal the instance of {@link Signal} to be handled.
* @return an {@link Optional} containing the first strategy which matches; an empty {@link Optional} in case no
* strategy matches.
*/
@Override
public Optional<SubstitutionStrategy<? extends Signal<?>>> getMatchingStrategy(final Signal<?> signal) {
for (final SubstitutionStrategy<?> strategy : strategies) {
if (strategy.matches(signal)) {
return Optional.of(strategy);
}
}
return Optional.empty();
}
@Override
public List<SubstitutionStrategy<?>> getStrategies() {
return strategies;
}
private static List<SubstitutionStrategy<?>> createStrategies() {
final List<SubstitutionStrategy<?>> strategies = new LinkedList<>();
// replacement for policy-subject-id
strategies.add(new ModifySubjectSubstitutionStrategy());
strategies.add(new ModifySubjectsSubstitutionStrategy());
strategies.add(new ModifyPolicyEntrySubstitutionStrategy());
strategies.add(new ModifyPolicyEntriesSubstitutionStrategy());
strategies.add(new ModifyPolicySubstitutionStrategy());
strategies.add(new CreatePolicySubstitutionStrategy());
return strategies;
}
}