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) 
public class org.apache.fop.fo.FONode$GatherContextInfoFunction implements org.apache.fop.util.text.AdvancedMessageFormat$Function
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.fop.fo.FONode$GatherContextInfoFunction
  super_class: java.lang.Object
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.fop.fo.FONode$GatherContextInfoFunction this
         0: .line 745
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.apache.fop.fo.FONode$GatherContextInfoFunction this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/fop/fo/FONode$GatherContextInfoFunction;

  public java.lang.Object evaluate(java.util.Map);
    descriptor: (Ljava/util/Map;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=4, args_size=2
        start local 0 // org.apache.fop.fo.FONode$GatherContextInfoFunction this
        start local 1 // java.util.Map params
         0: .line 749
            aload 1 /* params */
            ldc "source"
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            astore 2 /* obj */
        start local 2 // java.lang.Object obj
         1: .line 750
            aload 2 /* obj */
            instanceof org.apache.fop.fo.PropertyList
            ifeq 4
         2: .line 751
            aload 2 /* obj */
            checkcast org.apache.fop.fo.PropertyList
            astore 3 /* propList */
        start local 3 // org.apache.fop.fo.PropertyList propList
         3: .line 752
            aload 3 /* propList */
            invokevirtual org.apache.fop.fo.PropertyList.getFObj:()Lorg/apache/fop/fo/FObj;
            astore 2 /* obj */
        end local 3 // org.apache.fop.fo.PropertyList propList
         4: .line 754
      StackMap locals: java.lang.Object
      StackMap stack:
            aload 2 /* obj */
            instanceof org.apache.fop.fo.FONode
            ifeq 7
         5: .line 755
            aload 2 /* obj */
            checkcast org.apache.fop.fo.FONode
            astore 3 /* node */
        start local 3 // org.apache.fop.fo.FONode node
         6: .line 756
            aload 3 /* node */
            invokevirtual org.apache.fop.fo.FONode.getContextInfoAlt:()Ljava/lang/String;
            areturn
        end local 3 // org.apache.fop.fo.FONode node
         7: .line 758
      StackMap locals:
      StackMap stack:
            aconst_null
            areturn
        end local 2 // java.lang.Object obj
        end local 1 // java.util.Map params
        end local 0 // org.apache.fop.fo.FONode$GatherContextInfoFunction this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    8     0      this  Lorg/apache/fop/fo/FONode$GatherContextInfoFunction;
            0    8     1    params  Ljava/util/Map;
            1    8     2       obj  Ljava/lang/Object;
            3    4     3  propList  Lorg/apache/fop/fo/PropertyList;
            6    7     3      node  Lorg/apache/fop/fo/FONode;
    MethodParameters:
        Name  Flags
      params  

  public java.lang.Object getName();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.fop.fo.FONode$GatherContextInfoFunction this
         0: .line 763
            ldc "gatherContextInfo"
            areturn
        end local 0 // org.apache.fop.fo.FONode$GatherContextInfoFunction this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/fop/fo/FONode$GatherContextInfoFunction;
}
SourceFile: "FONode.java"
NestHost: org.apache.fop.fo.FONode
InnerClasses:
  public GatherContextInfoFunction = org.apache.fop.fo.FONode$GatherContextInfoFunction of org.apache.fop.fo.FONode
  public abstract Function = org.apache.fop.util.text.AdvancedMessageFormat$Function of org.apache.fop.util.text.AdvancedMessageFormat