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Java implementation of a concurrent trie hash map from Scala collections library

There is a newer version: 1.3.2

/*
 * (C) Copyright 2017 Pantheon Technologies, s.r.o. and others.
 *
 * 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 tech.pantheon.triemap;

/**
 * Presence predicate. These are specialized objects passed down from callers to indicate an assertion about
 * whether a mapping is required.
 *
 * @author Robert Varga
 */
enum PresencePredicate {
    ABSENT,
    PRESENT;
}