CacheOperationFilter.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.ignite.internal.processors.cache;

import org.jetbrains.annotations.Nullable;

/**
 * Cache operation filter.
 */
public enum CacheOperationFilter {
    /** Always pass. */
    ALWAYS,

    /** No value. */
    NO_VAL,

    /** Has value. */
    HAS_VAL,

    /** Equals to value. */
    EQUALS_VAL;

    /**
     * Creare predicate from operation filter.
     *
     * @param val Optional value.
     * @return Predicate.
     */
    @Nullable public CacheEntryPredicate createPredicate(@Nullable CacheObject val) {
        switch (this) {
            case ALWAYS:
                return null;

            case NO_VAL:
                return new CacheEntryPredicateNoValue();

            case HAS_VAL:
                return new CacheEntryPredicateHasValue();

            default:
                assert this == EQUALS_VAL;

                return new CacheEntryPredicateContainsValue(val);
        }
    }
}