Java tutorial
/** * PermissionsEx * Copyright (C) zml and PermissionsEx contributors * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package ninja.leaping.permissionsex.backend.sql; import com.google.common.collect.ImmutableList; import com.google.common.collect.ImmutableMap; import com.google.common.collect.ImmutableSet; import ninja.leaping.permissionsex.util.ThrowingBiConsumer; import java.sql.SQLException; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Set; import java.util.concurrent.atomic.AtomicReference; import static ninja.leaping.permissionsex.util.Util.appendImmutable; import static ninja.leaping.permissionsex.util.Util.updateImmutable; class Segment { private volatile int id; private final Set<Map.Entry<String, String>> contexts; private final Map<String, Integer> permissions; private final Map<String, String> options; private final List<SubjectRef> parents; private final Integer permissionDefault; private final AtomicReference<ImmutableList<ThrowingBiConsumer<SqlDao, Segment, SQLException>>> updatesToPerform = new AtomicReference<>(); Segment(int id, Set<Map.Entry<String, String>> contexts, Map<String, Integer> permissions, Map<String, String> options, List<SubjectRef> parents, Integer permissionDefault, ImmutableList<ThrowingBiConsumer<SqlDao, Segment, SQLException>> updates) { this.id = id; this.contexts = ImmutableSet.copyOf(contexts); this.permissions = permissions; this.options = options; this.parents = parents; this.permissionDefault = permissionDefault; this.updatesToPerform.set(updates); } static Segment empty(int id) { return new Segment(id, ImmutableSet.of(), ImmutableMap.of(), ImmutableMap.of(), ImmutableList.of(), null, null); } static Segment empty(int id, Set<Map.Entry<String, String>> contexts) { return new Segment(id, contexts, ImmutableMap.of(), ImmutableMap.of(), ImmutableList.of(), null, null); } private Segment newWithUpdate(Map<String, Integer> permissions, Map<String, String> options, List<SubjectRef> parents, Integer permissionDefault, ThrowingBiConsumer<SqlDao, Segment, SQLException> updateFunc) { return new Segment(this.id, this.contexts, permissions, options, parents, permissionDefault, appendImmutable(this.updatesToPerform.get(), updateFunc)); } static Segment unallocated() { return Segment.empty(-1); } static Segment unallocated(Set<Map.Entry<String, String>> contexts) { return Segment.empty(-1, contexts); } public int getId() { if (id == SqlConstants.UNALLOCATED) { throw new IllegalStateException("Unable to find issues"); } return id; } public Set<Map.Entry<String, String>> getContexts() { return contexts; } public Map<String, Integer> getPermissions() { return permissions; } public Map<String, String> getOptions() { return options; } public List<SubjectRef> getParents() { return parents; } public Integer getPermissionDefault() { return permissionDefault; } public Segment withOption(String key, String value) { return newWithUpdate(this.permissions, updateImmutable(this.options, key, value), this.parents, this.permissionDefault, (dao, seg) -> { dao.setOption(seg, key, value); }); } public Segment withoutOption(String key) { if (options == null || !options.containsKey(key)) { return this; } Map<String, String> newOptions = new HashMap<>(options); newOptions.remove(key); return newWithUpdate(this.permissions, newOptions, this.parents, this.permissionDefault, (dao, seg) -> { dao.clearOption(seg, key); }); } public Segment withOptions(Map<String, String> values) { Map<String, String> immValues = values == null ? null : ImmutableMap.copyOf(values); return newWithUpdate(permissions, immValues, parents, permissionDefault, (dao, seg) -> { dao.setOptions(seg, immValues); }); } public Segment withoutOptions() { return newWithUpdate(permissions, null, parents, permissionDefault, (dao, seg) -> dao.setOptions(seg, null)); } public Segment withPermission(String permission, int value) { return newWithUpdate(updateImmutable(permissions, permission, value), options, parents, permissionDefault, (dao, seg) -> dao.setPermission(seg, permission, value)); } public Segment withoutPermission(String permission) { if (permissions == null || !permissions.containsKey(permission)) { return this; } Map<String, Integer> newPermissions = new HashMap<>(permissions); newPermissions.remove(permission); return newWithUpdate(newPermissions, options, parents, permissionDefault, (dao, seg) -> dao.clearPermission(seg, permission)); } public Segment withPermissions(Map<String, Integer> values) { Map<String, Integer> immValues = values == null ? null : ImmutableMap.copyOf(values); return newWithUpdate(immValues, options, parents, permissionDefault, (dao, seg) -> dao.setPermissions(seg, immValues)); } public Segment withoutPermissions() { return newWithUpdate(null, options, parents, permissionDefault, (dao, seg) -> dao.setPermissions(seg, null)); } public Segment withDefaultValue(Integer permissionDefault) { return newWithUpdate(permissions, options, parents, permissionDefault, (dao, seg) -> dao.setDefaultValue(seg, permissionDefault)); } public Segment withAddedParent(SubjectRef parent) { ImmutableList.Builder<SubjectRef> parents = ImmutableList.builder(); parents.add(parent); if (this.parents != null) { parents.addAll(this.parents); } return newWithUpdate(permissions, options, parents.build(), permissionDefault, (dao, seg) -> dao.addParent(seg, parent)); } public Segment withRemovedParent(SubjectRef parent) { if (this.parents == null || this.parents.isEmpty()) { return this; } final List<SubjectRef> newParents = new ArrayList<>(parents); newParents.remove(parent); return newWithUpdate(permissions, options, parents, permissionDefault, (dao, seg) -> dao.removeParent(seg, parent)); } public Segment withParents(List<SubjectRef> parents) { List<SubjectRef> immValues = parents == null ? null : ImmutableList.copyOf(parents); return newWithUpdate(permissions, options, immValues, permissionDefault, (dao, seg) -> dao.setParents(seg, immValues)); } public Segment withoutParents() { return newWithUpdate(permissions, options, null, permissionDefault, (dao, seg) -> dao.setParents(seg, null)); } List<ThrowingBiConsumer<SqlDao, Segment, SQLException>> popUpdates() { return this.updatesToPerform.getAndSet(null); } void doUpdates(SqlDao dao) throws SQLException { List<ThrowingBiConsumer<SqlDao, Segment, SQLException>> updateFuncs = popUpdates(); if (updateFuncs != null) { for (ThrowingBiConsumer<SqlDao, Segment, SQLException> consumer : updateFuncs) { consumer.accept(dao, this); } } } @Override public String toString() { return "Segment{" + "id=" + id + ", contexts=" + contexts + ", permissions=" + permissions + ", options=" + options + ", parents=" + parents + ", permissionDefault=" + permissionDefault + '}'; } public boolean isEmpty() { return (this.permissions == null || this.permissions.isEmpty()) && (this.options == null || this.options.isEmpty()) && (this.parents == null || this.parents.isEmpty()) && this.permissionDefault == null; } boolean isUnallocated() { return this.id == SqlConstants.UNALLOCATED; } public void setId(int id) { this.id = id; } }