001/*
002 * PermissionsEx
003 * Copyright (C) zml and PermissionsEx contributors
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *    http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package ca.stellardrift.permissionsex.impl.logging;
018
019import ca.stellardrift.permissionsex.context.ContextValue;
020import ca.stellardrift.permissionsex.logging.PermissionCheckNotifier;
021import ca.stellardrift.permissionsex.subject.SubjectRef;
022
023import java.util.Collections;
024import java.util.LinkedHashMap;
025import java.util.List;
026import java.util.Map;
027import java.util.Set;
028
029/**
030 * Notification delegate for permissions checks that tracks recent permission checks.
031 *
032 * Allows accessing currently known permissions
033 */
034public class RecordingPermissionCheckNotifier implements PermissionCheckNotifier {
035    private static final int MAX_SIZE = 500;
036
037    private final Set<String> knownPermissions = sizeLimitedSet(MAX_SIZE);
038    private final Set<String> knownOptions = sizeLimitedSet(MAX_SIZE);
039
040    private static <T> Set<T> sizeLimitedSet(final int maxSize) {
041        return Collections.newSetFromMap(new LinkedHashMap<T, Boolean>() {
042            private static final long serialVersionUID = 9025221898274056636L;
043
044            @Override
045            protected boolean removeEldestEntry(Map.Entry<T, Boolean> eldest) {
046                return size() > maxSize;
047            }
048        });
049    }
050    @Override
051    public void onPermissionCheck(SubjectRef<?> subject, Set<ContextValue<?>> contexts, String permission, int value) {
052        knownPermissions.add(permission);
053
054    }
055
056    @Override
057    public void onOptionCheck(SubjectRef<?> subject, Set<ContextValue<?>> contexts, String option, String value) {
058        knownOptions.add(option);
059    }
060
061    @Override
062    public void onParentCheck(SubjectRef<?> subject, Set<ContextValue<?>> contexts, List<SubjectRef<?>> parents) {
063    }
064
065    public Set<String> getKnownPermissions() {
066        return Collections.unmodifiableSet(knownPermissions);
067    }
068
069    public Set<String> getKnownOptions() {
070        return Collections.unmodifiableSet(knownOptions);
071    }
072}