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The Amazon Kinesis Video Streams Parser Library for Java enables Java developers to parse the streams returned by GetMedia calls to Amazon Kinesis Video.
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// Generated by delombok at Tue Feb 01 19:16:53 UTC 2022
/*
Copyright 2017-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License"). 
You may not use this file except in compliance with the License. 
A copy of the License is located at

   http://aws.amazon.com/apache2.0/

or in the "license" file accompanying this file. 
This file 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 com.amazonaws.kinesisvideo.parser.ebml;

import org.apache.commons.lang3.Validate;
import java.nio.ByteBuffer;
import java.util.Optional;
import static com.amazonaws.kinesisvideo.parser.ebml.EBMLUtils.UNKNOWN_LENGTH_VALUE;

/**
 * This class is used by the parser to represent an EBML Element internally.
 */
class EBMLParserInternalElement {

    enum ElementReadState {
        NEW, ID_DONE, SIZE_DONE, CONTENT_READING, CONTENT_SKIPPING, FINISHED;
    }

    private final long startingOffset;
    private final long elementCount;
    ElementReadState currentElementReadState = ElementReadState.NEW;
    private int id;
    private long idNumBytes;
    private long dataSize;
    private long dataSizeNumBytes;
    private Optional elementMetaData = Optional.empty();

    public EBMLParserInternalElement(long startingOffset, long elementCount) {
        this.startingOffset = startingOffset;
        this.elementCount = elementCount;
    }

    public void readId(TrackingReplayableIdAndSizeByteSource idAndSizeByteSource) {
        Validate.isTrue(currentElementReadState == ElementReadState.NEW);
        idAndSizeByteSource.setReadOffsetForReplayBuffer(startingOffset);
        EBMLUtils.readId(idAndSizeByteSource, this::setId);
    }

    public void readSize(TrackingReplayableIdAndSizeByteSource idAndSizeByteSource) {
        Validate.isTrue(currentElementReadState == ElementReadState.ID_DONE);
        idAndSizeByteSource.setReadOffsetForReplayBuffer(startingOffset + idNumBytes);
        EBMLUtils.readSize(idAndSizeByteSource, this::setSize);
    }

    public void updateTypeInfo(EBMLTypeInfoProvider typeInfoProvider) {
        Validate.isTrue(currentElementReadState == ElementReadState.SIZE_DONE);
        Optional typeInfo = typeInfoProvider.getType(id);
        if (typeInfo.isPresent()) {
            elementMetaData = Optional.of(new EBMLElementMetaData(typeInfo.get(), elementCount));
        }
    }

    public boolean isKnownType() {
        return elementMetaData.isPresent();
    }

    public EBMLTypeInfo getTypeInfo() {
        return elementMetaData.get().getTypeInfo();
    }

    public EBMLElementMetaData getMetadata() {
        Validate.isTrue(elementMetaData.isPresent(), "EBML element metadata ");
        return elementMetaData.get();
    }

    public void startReadingContent() {
        Validate.isTrue(currentElementReadState == ElementReadState.SIZE_DONE);
        currentElementReadState = ElementReadState.CONTENT_READING;
    }

    public void startSkippingContent() {
        Validate.isTrue(currentElementReadState == ElementReadState.SIZE_DONE);
        currentElementReadState = ElementReadState.CONTENT_SKIPPING;
    }

    public void readContent(TrackingReplayableIdAndSizeByteSource idAndSizeByteSource, ParserBulkByteSource bulkByteSource, EBMLParserCallbacks callbacks, int maxContentBytesInOnePass) {
        Validate.isTrue(currentElementReadState == ElementReadState.CONTENT_READING);
        long bytesToRead = getBytesToRead(idAndSizeByteSource, maxContentBytesInOnePass);
        //Call onPartialContent if bytesToRead > 0.
        if (bytesToRead > 0) {
            callbacks.onPartialContent(elementMetaData.get(), bulkByteSource, (int) bytesToRead);
        }
        if (!isUnknownLength() && idAndSizeByteSource.getTotalBytesRead() >= getContentStartOffset() + dataSize) {
            currentElementReadState = ElementReadState.FINISHED;
        }
    }

    public void skipContent(TrackingReplayableIdAndSizeByteSource idAndSizeByteSource, ParserBulkByteSource bulkByteSource, ByteBuffer skipBuffer) {
        Validate.isTrue(currentElementReadState == ElementReadState.CONTENT_SKIPPING);
        long bytesToRead = getBytesToRead(idAndSizeByteSource, skipBuffer.remaining());
        if (bytesToRead > 0) {
            bulkByteSource.readBytes(skipBuffer, (int) bytesToRead);
        }
        if (idAndSizeByteSource.getTotalBytesRead() >= getContentStartOffset() + dataSize) {
            currentElementReadState = ElementReadState.FINISHED;
        }
    }

    public boolean isUnknownLength() {
        return dataSize == UNKNOWN_LENGTH_VALUE;
    }

    public long endOffSet() {
        Validate.isTrue(!isUnknownLength());
        return getContentStartOffset() + dataSize;
    }

    private long getContentStartOffset() {
        return startingOffset + idNumBytes + dataSizeNumBytes;
    }

    private void setId(int idArg, long idNumBytes) {
        Validate.isTrue(currentElementReadState == ElementReadState.NEW);
        this.id = idArg;
        this.idNumBytes = idNumBytes;
        currentElementReadState = ElementReadState.ID_DONE;
    }

    private void setSize(long sizeArg, long sizeNumBytes) {
        Validate.isTrue(currentElementReadState == ElementReadState.ID_DONE);
        this.dataSize = sizeArg;
        this.dataSizeNumBytes = sizeNumBytes;
        currentElementReadState = ElementReadState.SIZE_DONE;
    }

    private long getBytesToRead(TrackingReplayableIdAndSizeByteSource idAndSizeByteSource, int maxContentBytesInOnePass) {
        long bytesToRead = dataSize + getContentStartOffset() - (idAndSizeByteSource.getTotalBytesRead());
        bytesToRead = Math.min(bytesToRead, maxContentBytesInOnePass);
        bytesToRead = Math.min(bytesToRead, idAndSizeByteSource.availableForContent());
        return bytesToRead;
    }

    @Override
    @SuppressWarnings("all")
    public String toString() {
        return "EBMLParserInternalElement(startingOffset=" + this.startingOffset + ", elementCount=" + this.getElementCount() + ", currentElementReadState=" + this.currentElementReadState + ", id=" + this.getId() + ", idNumBytes=" + this.idNumBytes + ", dataSize=" + this.getDataSize() + ", dataSizeNumBytes=" + this.dataSizeNumBytes + ", elementMetaData=" + this.elementMetaData + ")";
    }

    @SuppressWarnings("all")
    public long getElementCount() {
        return this.elementCount;
    }

    @SuppressWarnings("all")
    public int getId() {
        return this.id;
    }

    @SuppressWarnings("all")
    public long getDataSize() {
        return this.dataSize;
    }
}