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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.utils;

import org.apache.flink.annotation.Internal;
import org.apache.flink.api.common.typeutils.SimpleTypeSerializerSnapshot;
import org.apache.flink.api.common.typeutils.TypeSerializerSnapshot;
import org.apache.flink.api.common.typeutils.base.TypeSerializerSingleton;
import org.apache.flink.core.memory.DataInputView;
import org.apache.flink.core.memory.DataOutputView;

import java.io.IOException;
import java.util.Arrays;

/** The serializer of {@link ByteArrayWrapper}. */
@Internal
public class ByteArrayWrapperSerializer extends TypeSerializerSingleton {

    private static final long serialVersionUID = 1L;

    public static final ByteArrayWrapperSerializer INSTANCE = new ByteArrayWrapperSerializer();

    @Override
    public boolean isImmutableType() {
        return false;
    }

    @Override
    public ByteArrayWrapper createInstance() {
        return new ByteArrayWrapper(new byte[0]);
    }

    @Override
    public ByteArrayWrapper copy(ByteArrayWrapper from) {
        byte[] data = Arrays.copyOfRange(from.getData(), from.getOffset(), from.getLimit());
        return new ByteArrayWrapper(data);
    }

    @Override
    public ByteArrayWrapper copy(ByteArrayWrapper from, ByteArrayWrapper reuse) {
        byte[] data = Arrays.copyOfRange(from.getData(), from.getOffset(), from.getLimit());
        reuse.setData(data);
        reuse.setOffset(0);
        reuse.setLimit(data.length);
        return reuse;
    }

    @Override
    public int getLength() {
        return -1;
    }

    @Override
    public void serialize(ByteArrayWrapper record, DataOutputView target) throws IOException {
        target.writeInt(record.getLimit() - record.getOffset());
        target.write(record.getData(), record.getOffset(), record.getLimit() - record.getOffset());
    }

    @Override
    public ByteArrayWrapper deserialize(DataInputView source) throws IOException {
        int length = source.readInt();
        byte[] result = new byte[length];
        source.readFully(result);
        return new ByteArrayWrapper(result);
    }

    @Override
    public ByteArrayWrapper deserialize(ByteArrayWrapper reuse, DataInputView source)
            throws IOException {
        int length = source.readInt();
        byte[] result = new byte[length];
        source.readFully(result);
        reuse.setData(result);
        reuse.setOffset(0);
        reuse.setLimit(result.length);
        return reuse;
    }

    @Override
    public void copy(DataInputView source, DataOutputView target) throws IOException {
        int length = source.readInt();
        byte[] result = new byte[length];
        source.readFully(result);
        target.writeInt(length);
        target.write(result);
    }

    @Override
    public TypeSerializerSnapshot snapshotConfiguration() {
        return new ByteArrayWrapperSerializerSnapshot();
    }

    /** Serializer configuration snapshot for compatibility and format evolution. */
    @SuppressWarnings("WeakerAccess")
    public static class ByteArrayWrapperSerializerSnapshot
            extends SimpleTypeSerializerSnapshot {

        public ByteArrayWrapperSerializerSnapshot() {
            super(() -> INSTANCE);
        }
    }
}