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 final class org.apache.fop.util.LanguageTags
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: org.apache.fop.util.LanguageTags
  super_class: java.lang.Object
{
  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.fop.util.LanguageTags this
         0: .line 32
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 33
            return
        end local 0 // org.apache.fop.util.LanguageTags this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/fop/util/LanguageTags;

  public static java.lang.String toLanguageTag(java.util.Locale);
    descriptor: (Ljava/util/Locale;)Ljava/lang/String;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=3, args_size=1
        start local 0 // java.util.Locale locale
         0: .line 42
            new java.lang.StringBuffer
            dup
            iconst_5
            invokespecial java.lang.StringBuffer.<init>:(I)V
            astore 1 /* sb */
        start local 1 // java.lang.StringBuffer sb
         1: .line 43
            aload 1 /* sb */
            aload 0 /* locale */
            invokevirtual java.util.Locale.getLanguage:()Ljava/lang/String;
            invokevirtual java.lang.StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;
            pop
         2: .line 44
            aload 0 /* locale */
            invokevirtual java.util.Locale.getCountry:()Ljava/lang/String;
            astore 2 /* country */
        start local 2 // java.lang.String country
         3: .line 45
            aload 2 /* country */
            invokevirtual java.lang.String.length:()I
            ifle 6
         4: .line 46
            aload 1 /* sb */
            bipush 45
            invokevirtual java.lang.StringBuffer.append:(C)Ljava/lang/StringBuffer;
            pop
         5: .line 47
            aload 1 /* sb */
            aload 2 /* country */
            invokevirtual java.lang.StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;
            pop
         6: .line 49
      StackMap locals: java.lang.StringBuffer java.lang.String
      StackMap stack:
            aload 1 /* sb */
            invokevirtual java.lang.StringBuffer.toString:()Ljava/lang/String;
            areturn
        end local 2 // java.lang.String country
        end local 1 // java.lang.StringBuffer sb
        end local 0 // java.util.Locale locale
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    7     0   locale  Ljava/util/Locale;
            1    7     1       sb  Ljava/lang/StringBuffer;
            3    7     2  country  Ljava/lang/String;
    MethodParameters:
        Name  Flags
      locale  

  public static java.util.Locale toLocale(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/util/Locale;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=2, args_size=1
        start local 0 // java.lang.String languageTag
         0: .line 59
            aload 0 /* languageTag */
            ldc "-"
            invokevirtual java.lang.String.split:(Ljava/lang/String;)[Ljava/lang/String;
            astore 1 /* parts */
        start local 1 // java.lang.String[] parts
         1: .line 60
            aload 1 /* parts */
            arraylength
            iconst_1
            if_icmpne 3
         2: .line 61
            new java.util.Locale
            dup
            aload 1 /* parts */
            iconst_0
            aaload
            invokespecial java.util.Locale.<init>:(Ljava/lang/String;)V
            areturn
         3: .line 63
      StackMap locals: java.lang.String[]
      StackMap stack:
            new java.util.Locale
            dup
            aload 1 /* parts */
            iconst_0
            aaload
            aload 1 /* parts */
            iconst_1
            aaload
            invokespecial java.util.Locale.<init>:(Ljava/lang/String;Ljava/lang/String;)V
            areturn
        end local 1 // java.lang.String[] parts
        end local 0 // java.lang.String languageTag
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    4     0  languageTag  Ljava/lang/String;
            1    4     1        parts  [Ljava/lang/String;
    MethodParameters:
             Name  Flags
      languageTag  
}
SourceFile: "LanguageTags.java"