http://xmlgraphics.apache.org/fop/: Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF. (Apache Software Foundation) 
final class org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator extends org.apache.fop.pdf.FileIDGenerator
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator
  super_class: org.apache.fop.pdf.FileIDGenerator
{
  private byte[] fileID;
    descriptor: [B
    flags: (0x0002) ACC_PRIVATE

  private final org.apache.fop.pdf.PDFDocument document;
    descriptor: Lorg/apache/fop/pdf/PDFDocument;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final java.security.MessageDigest digest;
    descriptor: Ljava/security/MessageDigest;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  void <init>(org.apache.fop.pdf.PDFDocument);
    descriptor: (Lorg/apache/fop/pdf/PDFDocument;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator this
        start local 1 // org.apache.fop.pdf.PDFDocument document
         0: .line 69
            aload 0 /* this */
            invokespecial org.apache.fop.pdf.FileIDGenerator.<init>:()V
         1: .line 70
            aload 0 /* this */
            aload 1 /* document */
            putfield org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator.document:Lorg/apache/fop/pdf/PDFDocument;
         2: .line 71
            aload 0 /* this */
            ldc "MD5"
            invokestatic java.security.MessageDigest.getInstance:(Ljava/lang/String;)Ljava/security/MessageDigest;
            putfield org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator.digest:Ljava/security/MessageDigest;
         3: .line 72
            return
        end local 1 // org.apache.fop.pdf.PDFDocument document
        end local 0 // org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    4     0      this  Lorg/apache/fop/pdf/FileIDGenerator$DigestFileIDGenerator;
            0    4     1  document  Lorg/apache/fop/pdf/PDFDocument;
    Exceptions:
      throws java.security.NoSuchAlgorithmException
    MethodParameters:
          Name  Flags
      document  

  byte[] getOriginalFileID();
    descriptor: ()[B
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator this
         0: .line 76
            aload 0 /* this */
            getfield org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator.fileID:[B
            ifnonnull 2
         1: .line 77
            aload 0 /* this */
            invokevirtual org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator.generateFileID:()V
         2: .line 79
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator.fileID:[B
            areturn
        end local 0 // org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/apache/fop/pdf/FileIDGenerator$DigestFileIDGenerator;

  byte[] getUpdatedFileID();
    descriptor: ()[B
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator this
         0: .line 84
            aload 0 /* this */
            invokevirtual org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator.getOriginalFileID:()[B
            areturn
        end local 0 // org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/fop/pdf/FileIDGenerator$DigestFileIDGenerator;

  private void generateFileID();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=4, locals=2, args_size=1
        start local 0 // org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator this
         0: .line 88
            new java.text.SimpleDateFormat
            dup
            ldc "yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'SSS"
            invokespecial java.text.SimpleDateFormat.<init>:(Ljava/lang/String;)V
            astore 1 /* df */
        start local 1 // java.text.DateFormat df
         1: .line 89
            aload 0 /* this */
            getfield org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator.digest:Ljava/security/MessageDigest;
            aload 1 /* df */
            new java.util.Date
            dup
            invokespecial java.util.Date.<init>:()V
            invokevirtual java.text.DateFormat.format:(Ljava/util/Date;)Ljava/lang/String;
            invokestatic org.apache.fop.pdf.PDFDocument.encode:(Ljava/lang/String;)[B
            invokevirtual java.security.MessageDigest.update:([B)V
         2: .line 92
            aload 0 /* this */
            getfield org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator.digest:Ljava/security/MessageDigest;
            aload 0 /* this */
            getfield org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator.document:Lorg/apache/fop/pdf/PDFDocument;
            invokevirtual org.apache.fop.pdf.PDFDocument.getCurrentFileSize:()J
            invokestatic java.lang.String.valueOf:(J)Ljava/lang/String;
            invokestatic org.apache.fop.pdf.PDFDocument.encode:(Ljava/lang/String;)[B
            invokevirtual java.security.MessageDigest.update:([B)V
         3: .line 93
            aload 0 /* this */
            getfield org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator.digest:Ljava/security/MessageDigest;
            aload 0 /* this */
            getfield org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator.document:Lorg/apache/fop/pdf/PDFDocument;
            invokevirtual org.apache.fop.pdf.PDFDocument.getInfo:()Lorg/apache/fop/pdf/PDFInfo;
            invokevirtual org.apache.fop.pdf.PDFInfo.toPDF:()[B
            invokevirtual java.security.MessageDigest.update:([B)V
         4: .line 94
            aload 0 /* this */
            aload 0 /* this */
            getfield org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator.digest:Ljava/security/MessageDigest;
            invokevirtual java.security.MessageDigest.digest:()[B
            putfield org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator.fileID:[B
         5: .line 95
            return
        end local 1 // java.text.DateFormat df
        end local 0 // org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0  this  Lorg/apache/fop/pdf/FileIDGenerator$DigestFileIDGenerator;
            1    6     1    df  Ljava/text/DateFormat;
}
SourceFile: "FileIDGenerator.java"
NestHost: org.apache.fop.pdf.FileIDGenerator
InnerClasses:
  private final DigestFileIDGenerator = org.apache.fop.pdf.FileIDGenerator$DigestFileIDGenerator of org.apache.fop.pdf.FileIDGenerator