Java

Transition from BeginCompressStringENC to FirstChunk/LastChunk

Provides instructions for replacing deprecated BeginCompressStringENC method calls with using FirstChunk/LastChunk properties. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    //  This example assumes the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkStringBuilder sbCompressedBase64 = new CkStringBuilder();

    CkCompression compress = new CkCompression();
    compress.put_Algorithm("deflate");
    compress.put_Charset("utf-8");
    compress.put_EncodingMode("base64");

    CkStringBuilder sbIndex = new CkStringBuilder();

    //  ----------------------------------------------------------------------------------
    //  This is the deprecated way of compressing in chunks using Begin/More/End methods..
    //  ----------------------------------------------------------------------------------
    int i;
    for (i = 0; i <= 24; i++) {
        //  Note: It is possible (and normal) for a BeginCompress* or MoreCompress* method to return
        //  an empty string (or 0 bytes).  When this happens, the input data is not lost.  It will be flushed
        //  in a subsequent call.
        sbIndex.Clear();
        sbIndex.AppendInt(i);
        if (i == 0) {
            sbCompressedBase64.Append(compress.beginCompressStringENC(sbIndex.getAsString()));
            }
        else {
            sbCompressedBase64.Append(compress.moreCompressStringENC(sbIndex.getAsString()));
            }

        sbCompressedBase64.Append(compress.moreCompressStringENC(": This is a line of data to be compressed...\r\n"));
        }

    //  Flush any remaining output.
    sbCompressedBase64.Append(compress.endCompressStringENC());

    System.out.println("The base64 encoded compressed text:");
    System.out.println(sbCompressedBase64.getAsString());

    //  Decompress in one call:
    String originalText = compress.decompressStringENC(sbCompressedBase64.getAsString());
    System.out.println(originalText);

    //  ----------------------------------------------------------------------------------
    //  This is new way of compressing in chunks using FirstChunk and LastChunk properties
    //  ----------------------------------------------------------------------------------

    sbCompressedBase64.Clear();

    compress.put_FirstChunk(true);
    compress.put_LastChunk(false);

    CkBinData bdCompressed = new CkBinData();
    CkStringBuilder sbUncompressedChunk = new CkStringBuilder();

    for (i = 0; i <= 24; i++) {
        if (i == 24) {
            compress.put_LastChunk(true);
            }

        sbUncompressedChunk.Clear();
        sbUncompressedChunk.AppendInt(i);
        sbUncompressedChunk.Append(": This is a line of data to be compressed...\r\n");

        compress.CompressSb(sbUncompressedChunk,bdCompressed);

        compress.put_FirstChunk(false);
        }

    System.out.println("The base64 encoded compressed text:");
    System.out.println(bdCompressed.getEncoded("base64"));

    //  Decompress in one call:
    originalText = compress.decompressStringENC(bdCompressed.getEncoded("base64"));
    System.out.println(originalText);
  }
}