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.PDFShading$1 implements org.apache.fop.render.gradient.Shading$FunctionRenderer
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.apache.fop.pdf.PDFShading$1
  super_class: java.lang.Object
{
  final org.apache.fop.pdf.PDFShading this$0;
    descriptor: Lorg/apache/fop/pdf/PDFShading;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(org.apache.fop.pdf.PDFShading);
    descriptor: (Lorg/apache/fop/pdf/PDFShading;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.fop.pdf.PDFShading$1 this
         0: .line 100
            aload 0 /* this */
            aload 1
            putfield org.apache.fop.pdf.PDFShading$1.this$0:Lorg/apache/fop/pdf/PDFShading;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.apache.fop.pdf.PDFShading$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/fop/pdf/PDFShading$1;
    MethodParameters:
        Name  Flags
      this$0  final

  public void outputFunction(java.lang.StringBuilder);
    descriptor: (Ljava/lang/StringBuilder;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.fop.pdf.PDFShading$1 this
        start local 1 // java.lang.StringBuilder out
         0: .line 103
            aload 1 /* out */
            aload 0 /* this */
            getfield org.apache.fop.pdf.PDFShading$1.this$0:Lorg/apache/fop/pdf/PDFShading;
            getfield org.apache.fop.pdf.PDFShading.pdfFunction:Lorg/apache/fop/pdf/PDFFunction;
            invokevirtual org.apache.fop.pdf.PDFFunction.referencePDF:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         1: .line 104
            return
        end local 1 // java.lang.StringBuilder out
        end local 0 // org.apache.fop.pdf.PDFShading$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/fop/pdf/PDFShading$1;
            0    2     1   out  Ljava/lang/StringBuilder;
    MethodParameters:
      Name  Flags
      out   
}
SourceFile: "PDFShading.java"
EnclosingMethod: org.apache.fop.pdf.PDFShading.toPDFString:()Ljava/lang/String;
NestHost: org.apache.fop.pdf.PDFShading
InnerClasses:
  org.apache.fop.pdf.PDFShading$1
  public abstract FunctionRenderer = org.apache.fop.render.gradient.Shading$FunctionRenderer of org.apache.fop.render.gradient.Shading