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/*
 * 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.flink.runtime.query;

import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.runtime.state.internal.InternalKvState;
import org.apache.flink.util.Preconditions;

import java.util.Objects;

/**
 * Metadata about a {@link InternalKvState}. This includes the serializers for
 * the key, the namespace, and the values kept in the state.
 *
 * @param 	The type of key the state is associated to
 * @param 	The type of the namespace the state is associated to
 * @param 	The type of values kept internally in state
 */
public class KvStateInfo {

	private final TypeSerializer keySerializer;
	private final TypeSerializer namespaceSerializer;
	private final TypeSerializer stateValueSerializer;

	public KvStateInfo(
			final TypeSerializer keySerializer,
			final TypeSerializer namespaceSerializer,
			final TypeSerializer stateValueSerializer
	) {
		this.keySerializer = Preconditions.checkNotNull(keySerializer);
		this.namespaceSerializer = Preconditions.checkNotNull(namespaceSerializer);
		this.stateValueSerializer = Preconditions.checkNotNull(stateValueSerializer);
	}

	/**
	 * @return The serializer for the key the state is associated to.
	 */
	public TypeSerializer getKeySerializer() {
		return keySerializer;
	}

	/**
	 * @return The serializer for the namespace the state is associated to.
	 */
	public TypeSerializer getNamespaceSerializer() {
		return namespaceSerializer;
	}

	/**
	 * @return The serializer for the values kept in the state.
	 */
	public TypeSerializer getStateValueSerializer() {
		return stateValueSerializer;
	}

	/**
	 * Creates a deep copy of the current {@link KvStateInfo} by duplicating
	 * all the included serializers.
	 *
	 * 

This method assumes correct implementation of the {@link TypeSerializer#duplicate()} * method of the included serializers. */ public KvStateInfo duplicate() { final TypeSerializer dupKeySerializer = keySerializer.duplicate(); final TypeSerializer dupNamespaceSerializer = namespaceSerializer.duplicate(); final TypeSerializer dupSVSerializer = stateValueSerializer.duplicate(); if ( dupKeySerializer == keySerializer && dupNamespaceSerializer == namespaceSerializer && dupSVSerializer == stateValueSerializer ) { return this; } return new KvStateInfo<>(dupKeySerializer, dupNamespaceSerializer, dupSVSerializer); } @Override public boolean equals(Object o) { if (this == o) { return true; } if (o == null || getClass() != o.getClass()) { return false; } KvStateInfo stateInfo = (KvStateInfo) o; return Objects.equals(keySerializer, stateInfo.keySerializer) && Objects.equals(namespaceSerializer, stateInfo.namespaceSerializer) && Objects.equals(stateValueSerializer, stateInfo.stateValueSerializer); } @Override public int hashCode() { return Objects.hash(keySerializer, namespaceSerializer, stateValueSerializer); } }





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