/*
 * 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.api.java.io;

import org.apache.flink.annotation.PublicEvolving;
import org.apache.flink.api.common.io.BinaryInputFormat;
import org.apache.flink.api.common.serialization.SerializerConfigImpl;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.java.typeutils.ResultTypeQueryable;
import org.apache.flink.core.memory.DataInputView;

import java.io.IOException;

/**
 * Reads elements by deserializing them with a given type serializer.
 *
 * @param <T>
 * @deprecated All Flink DataSet APIs are deprecated since Flink 1.18 and will be removed in a
 *     future Flink major version. You can still build your application in DataSet, but you should
 *     move to either the DataStream and/or Table API.
 * @see <a href="https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=158866741">
 *     FLIP-131: Consolidate the user-facing Dataflow SDKs/APIs (and deprecate the DataSet API</a>
 */
@Deprecated
@PublicEvolving
public class TypeSerializerInputFormat<T> extends BinaryInputFormat<T>
        implements ResultTypeQueryable<T> {

    private static final long serialVersionUID = 2123068581665107480L;

    private transient TypeInformation<T> resultType;

    private TypeSerializer<T> serializer;

    public TypeSerializerInputFormat(TypeInformation<T> resultType) {
        this.resultType = resultType;
        // TODO: fix this
        this.serializer = resultType.createSerializer(new SerializerConfigImpl());
    }

    @Override
    protected T deserialize(T reuse, DataInputView dataInput) throws IOException {
        return serializer.deserialize(reuse, dataInput);
    }

    // --------------------------------------------------------------------------------------------
    // Typing
    // --------------------------------------------------------------------------------------------

    @Override
    public TypeInformation<T> getProducedType() {
        return resultType;
    }
}
