io.micronaut.pulsar.schemas.protobuf.ProtobufReader Maven / Gradle / Ivy

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/*
 * Copyright 2017-2022 original authors
 *
 * 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
 *
 * https://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 io.micronaut.pulsar.schemas.protobuf;

import io.micronaut.core.type.Argument;
import io.micronaut.protobuf.codec.ProtobufferCodec;
import org.apache.pulsar.client.api.schema.SchemaReader;

import java.io.InputStream;
import java.util.Arrays;

/**
 * Protobuf Schema Reader to allow using {@link ProtobufferCodec} from Micronaut.
 *
 * @param  POJO type to process.
 * @author Haris Secic
 * @since 1.1.0
 */
public class ProtobufReader implements SchemaReader {

    private final ProtobufferCodec codec;
    private final Argument type;

    public ProtobufReader(final ProtobufferCodec codec, final Argument type) {
        this.codec = codec;
        this.type = type;
    }

    @Override
    public T read(byte[] bytes, int offset, int length) {
        if (0 == offset && bytes.length == length) {
            return codec.decode(type, bytes);
        }
        final byte[] copy = Arrays.copyOfRange(bytes, offset, length);
        return codec.decode(type, copy);
    }

    @Override
    public T read(InputStream inputStream) {
        return codec.decode(type, inputStream);
    }
}