com.hazelcast.query.TruePredicate Maven / Gradle / Ivy

Go to download
/*
 * Copyright (c) 2008-2016, Hazelcast, Inc. All Rights Reserved.
 *
 * 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 com.hazelcast.query;

import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.IdentifiedDataSerializable;
import com.hazelcast.query.impl.predicates.PredicateDataSerializerHook;

import java.io.IOException;
import java.util.Map;

import static com.hazelcast.internal.serialization.impl.FactoryIdHelper.PREDICATE_DS_FACTORY_ID;

/**
 * A {@link com.hazelcast.query.Predicate} which always returns true.
 */
public class TruePredicate implements IdentifiedDataSerializable, Predicate {

    //reminder:
    //when TruePredicate is going to implement IdentifiedDataSerializable, make sure no new instance
    // is created, but the INSTANCE is returned. No need to create new objects.

    /**
     * An instance of the TruePredicate.
     */
    public static final TruePredicate INSTANCE = new TruePredicate();

    @Override
    public void writeData(ObjectDataOutput out) throws IOException {
    }

    @Override
    public void readData(ObjectDataInput in) throws IOException {
    }

    @Override
    public boolean apply(Map.Entry mapEntry) {
        return true;
    }

    @Override
    public String toString() {
        return "TruePredicate{}";
    }

    @Override
    public int getFactoryId() {
        return PREDICATE_DS_FACTORY_ID;
    }

    @Override
    public int getId() {
        return PredicateDataSerializerHook.TRUE_PREDICATE;
    }
}