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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.streaming.api.operators.sorted.state;

import org.apache.flink.api.common.state.State;
import org.apache.flink.api.common.state.StateDescriptor;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.runtime.state.internal.InternalValueState;

/** A {@link ValueState} which keeps value for a single key at a time. */
class BatchExecutionKeyValueState extends AbstractBatchExecutionKeyState
        implements InternalValueState {

    BatchExecutionKeyValueState(
            T defaultValue,
            TypeSerializer keySerializer,
            TypeSerializer namespaceSerializer,
            TypeSerializer stateTypeSerializer) {
        super(defaultValue, keySerializer, namespaceSerializer, stateTypeSerializer);
    }

    @Override
    public T value() {
        return getOrDefault();
    }

    @Override
    public void update(T value) {
        setCurrentNamespaceValue(value);
    }

    @SuppressWarnings("unchecked")
    static  IS create(
            TypeSerializer keySerializer,
            TypeSerializer namespaceSerializer,
            StateDescriptor stateDesc) {
        return (IS)
                new BatchExecutionKeyValueState<>(
                        stateDesc.getDefaultValue(),
                        keySerializer,
                        namespaceSerializer,
                        stateDesc.getSerializer());
    }
}