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) 
class org.apache.fop.pdf.PDFFunction$2 implements org.apache.fop.render.gradient.GradientMaker$DoubleFormatter
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.apache.fop.pdf.PDFFunction$2
  super_class: java.lang.Object
{
  final org.apache.fop.pdf.PDFFunction this$0;
    descriptor: Lorg/apache/fop/pdf/PDFFunction;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(org.apache.fop.pdf.PDFFunction);
    descriptor: (Lorg/apache/fop/pdf/PDFFunction;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.fop.pdf.PDFFunction$2 this
         0: .line 118
            aload 0 /* this */
            aload 1
            putfield org.apache.fop.pdf.PDFFunction$2.this$0:Lorg/apache/fop/pdf/PDFFunction;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.apache.fop.pdf.PDFFunction$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/fop/pdf/PDFFunction$2;
    MethodParameters:
        Name  Flags
      this$0  final

  public java.lang.String formatDouble(double);
    descriptor: (D)Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.apache.fop.pdf.PDFFunction$2 this
        start local 1 // double d
         0: .line 121
            dload 1 /* d */
            invokestatic org.apache.fop.pdf.PDFNumber.doubleOut:(D)Ljava/lang/String;
            areturn
        end local 1 // double d
        end local 0 // org.apache.fop.pdf.PDFFunction$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/fop/pdf/PDFFunction$2;
            0    1     1     d  D
    MethodParameters:
      Name  Flags
      d     
}
SourceFile: "PDFFunction.java"
EnclosingMethod: org.apache.fop.pdf.PDFFunction.toByteString:()[B
NestHost: org.apache.fop.pdf.PDFFunction
InnerClasses:
  org.apache.fop.pdf.PDFFunction$2
  public abstract DoubleFormatter = org.apache.fop.render.gradient.GradientMaker$DoubleFormatter of org.apache.fop.render.gradient.GradientMaker