com.flybotix.hfr.codex.encode.AEncoder Maven / Gradle / Ivy

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A way for wifi robots and IoT devices to quickly send compressed data arrays across a network.

There is a newer version: 2019.1.11

package com.flybotix.hfr.codex.encode;

import java.nio.ByteBuffer;
import java.util.EnumSet;

import com.flybotix.hfr.codex.CodexMetadata;
import com.flybotix.hfr.codex.CodexOf;
import com.flybotix.hfr.util.lang.EnumUtils;
import com.flybotix.hfr.util.log.ILog;
import com.flybotix.hfr.util.log.Logger;
import com.flybotix.hfr.codex.Codex;

public abstract class AEncoder  & CodexOf>{
  private static final ILog mLog = Logger.createLog(AEncoder.class);

  private final Class mEnumClass;
  protected final int mLength;
  protected final int mBitSetByteLength;
  protected final int mEnumHash;
  
  public AEncoder(Class pEnum) {
    mEnumClass = pEnum;
    mLength = EnumSet.allOf(pEnum).size();
    mEnumHash = EnumUtils.hashOf(pEnum);
    mBitSetByteLength = (mLength + Byte.SIZE-1) / Byte.SIZE;
  }
  
  public int getMsgId() {
    return mEnumHash;
  }
  
  public Class getEnum() {
    return mEnumClass;
  }
  
  public abstract int getBufferSizeInBytes();
  public abstract V getDefaultValue();
  public abstract V[] generateEmptyArray();
  public abstract AEncoder createClone();
  
  public byte[] encode(Codex pData) {
    byte[] body = encodeImpl(pData);
    byte[] header = pData.meta().encode();
    mLog.debug("Header: " + pData.meta());
    
    return ByteBuffer.allocate(header.length + body.length).put(header).put(body).array();
  }
  
  public Codex decode(ByteBuffer pData) {
    CodexMetadata header = CodexMetadata.parse(mEnumClass, pData);
    mLog.debug("Header: " + header);
    Codex body = decodeImpl(pData);
    body.setMetadata(header);
    return body;
  }
  
  protected abstract Codex decodeImpl(ByteBuffer pData);
  
  protected abstract byte[] encodeImpl(Codex pData);
}