PermissionCheckers.java

/*
 * This file is part of adventure, licensed under the MIT License.
 *
 * Copyright (c) 2017-2021 KyoriPowered
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package net.kyori.adventure.permission;

import net.kyori.adventure.util.TriState;
import org.checkerframework.checker.nullness.qual.NonNull;
import org.checkerframework.checker.nullness.qual.Nullable;

final class PermissionCheckers {
  static final PermissionChecker NOT_SET = new Always(TriState.NOT_SET);
  static final PermissionChecker FALSE = new Always(TriState.FALSE);
  static final PermissionChecker TRUE = new Always(TriState.TRUE);

  private PermissionCheckers() {
  }

  private static final class Always implements PermissionChecker {
    private final TriState value;

    private Always(final TriState value) {
      this.value = value;
    }

    @Override
    public @NonNull TriState value(final String permission) {
      return this.value;
    }

    @Override
    public String toString() {
      return PermissionChecker.class.getSimpleName() + ".always(" + this.value + ")";
    }

    @Override
    public boolean equals(final @Nullable Object other) {
      if(this == other) return true;
      if(other == null || this.getClass() != other.getClass()) return false;
      final Always always = (Always) other;
      return this.value == always.value;
    }

    @Override
    public int hashCode() {
      return this.value.hashCode();
    }
  }
}