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.pdf.PDFPages extends org.apache.fop.pdf.PDFObject
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.fop.pdf.PDFPages
  super_class: org.apache.fop.pdf.PDFObject
{
  protected java.util.List kids;
    descriptor: Ljava/util/List;
    flags: (0x0004) ACC_PROTECTED

  protected int count;
    descriptor: I
    flags: (0x0004) ACC_PROTECTED

  public void <init>(org.apache.fop.pdf.PDFDocument);
    descriptor: (Lorg/apache/fop/pdf/PDFDocument;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.apache.fop.pdf.PDFPages this
        start local 1 // org.apache.fop.pdf.PDFDocument document
         0: .line 54
            aload 0 /* this */
            invokespecial org.apache.fop.pdf.PDFObject.<init>:()V
         1: .line 37
            aload 0 /* this */
            new java.util.ArrayList
            dup
            invokespecial java.util.ArrayList.<init>:()V
            putfield org.apache.fop.pdf.PDFPages.kids:Ljava/util/List;
         2: .line 55
            aload 0 /* this */
            aload 1 /* document */
            invokevirtual org.apache.fop.pdf.PDFPages.setObjectNumber:(Lorg/apache/fop/pdf/PDFDocument;)V
         3: .line 56
            return
        end local 1 // org.apache.fop.pdf.PDFDocument document
        end local 0 // org.apache.fop.pdf.PDFPages this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    4     0      this  Lorg/apache/fop/pdf/PDFPages;
            0    4     1  document  Lorg/apache/fop/pdf/PDFDocument;
    MethodParameters:
          Name  Flags
      document  

  public void addPage(org.apache.fop.pdf.PDFPage);
    descriptor: (Lorg/apache/fop/pdf/PDFPage;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.fop.pdf.PDFPages this
        start local 1 // org.apache.fop.pdf.PDFPage page
         0: .line 64
            aload 1 /* page */
            aload 0 /* this */
            invokevirtual org.apache.fop.pdf.PDFPage.setParent:(Lorg/apache/fop/pdf/PDFPages;)V
         1: .line 65
            aload 0 /* this */
            invokevirtual org.apache.fop.pdf.PDFPages.incrementCount:()V
         2: .line 66
            return
        end local 1 // org.apache.fop.pdf.PDFPage page
        end local 0 // org.apache.fop.pdf.PDFPages this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/apache/fop/pdf/PDFPages;
            0    3     1  page  Lorg/apache/fop/pdf/PDFPage;
    MethodParameters:
      Name  Flags
      page  

  public void notifyKidRegistered(org.apache.fop.pdf.PDFPage);
    descriptor: (Lorg/apache/fop/pdf/PDFPage;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=3, args_size=2
        start local 0 // org.apache.fop.pdf.PDFPages this
        start local 1 // org.apache.fop.pdf.PDFPage page
         0: .line 73
            aload 1 /* page */
            invokevirtual org.apache.fop.pdf.PDFPage.getPageIndex:()I
            istore 2 /* idx */
        start local 2 // int idx
         1: .line 74
            iload 2 /* idx */
            iflt 11
         2: .line 75
            goto 4
         3: .line 76
      StackMap locals: int
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.fop.pdf.PDFPages.kids:Ljava/util/List;
            aconst_null
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
         4: .line 75
      StackMap locals:
      StackMap stack:
            iload 2 /* idx */
            aload 0 /* this */
            getfield org.apache.fop.pdf.PDFPages.kids:Ljava/util/List;
            invokeinterface java.util.List.size:()I
            iconst_1
            isub
            if_icmpgt 3
         5: .line 78
            aload 0 /* this */
            getfield org.apache.fop.pdf.PDFPages.kids:Ljava/util/List;
            iload 2 /* idx */
            invokeinterface java.util.List.get:(I)Ljava/lang/Object;
            ifnull 9
         6: .line 79
            new java.lang.IllegalStateException
            dup
            new java.lang.StringBuilder
            dup
            ldc "A page already exists at index "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
         7: .line 80
            iload 2 /* idx */
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            ldc " (zero-based)."
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
         8: .line 79
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
         9: .line 82
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.fop.pdf.PDFPages.kids:Ljava/util/List;
            iload 2 /* idx */
            aload 1 /* page */
            invokevirtual org.apache.fop.pdf.PDFPage.makeReference:()Lorg/apache/fop/pdf/PDFReference;
            invokeinterface java.util.List.set:(ILjava/lang/Object;)Ljava/lang/Object;
            pop
        10: .line 83
            goto 12
        11: .line 84
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.fop.pdf.PDFPages.kids:Ljava/util/List;
            aload 1 /* page */
            invokevirtual org.apache.fop.pdf.PDFPage.makeReference:()Lorg/apache/fop/pdf/PDFReference;
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
        12: .line 86
      StackMap locals:
      StackMap stack:
            return
        end local 2 // int idx
        end local 1 // org.apache.fop.pdf.PDFPage page
        end local 0 // org.apache.fop.pdf.PDFPages this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   13     0  this  Lorg/apache/fop/pdf/PDFPages;
            0   13     1  page  Lorg/apache/fop/pdf/PDFPage;
            1   13     2   idx  I
    MethodParameters:
      Name  Flags
      page  

  public int getCount();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.fop.pdf.PDFPages this
         0: .line 94
            aload 0 /* this */
            getfield org.apache.fop.pdf.PDFPages.count:I
            ireturn
        end local 0 // org.apache.fop.pdf.PDFPages this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/fop/pdf/PDFPages;

  public void incrementCount();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.apache.fop.pdf.PDFPages this
         0: .line 101
            aload 0 /* this */
            dup
            getfield org.apache.fop.pdf.PDFPages.count:I
            iconst_1
            iadd
            putfield org.apache.fop.pdf.PDFPages.count:I
         1: .line 103
            return
        end local 0 // org.apache.fop.pdf.PDFPages this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/fop/pdf/PDFPages;

  public java.lang.String toPDFString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=4, args_size=1
        start local 0 // org.apache.fop.pdf.PDFPages this
         0: .line 109
            new java.lang.StringBuffer
            dup
            bipush 64
            invokespecial java.lang.StringBuffer.<init>:(I)V
            astore 1 /* sb */
        start local 1 // java.lang.StringBuffer sb
         1: .line 110
            aload 1 /* sb */
            ldc "<< /Type /Pages\n/Count "
            invokevirtual java.lang.StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;
         2: .line 111
            aload 0 /* this */
            invokevirtual org.apache.fop.pdf.PDFPages.getCount:()I
            invokevirtual java.lang.StringBuffer.append:(I)Ljava/lang/StringBuffer;
         3: .line 112
            ldc "\n/Kids ["
            invokevirtual java.lang.StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;
            pop
         4: .line 113
            aload 0 /* this */
            getfield org.apache.fop.pdf.PDFPages.kids:Ljava/util/List;
            invokeinterface java.util.List.iterator:()Ljava/util/Iterator;
            astore 3
            goto 9
      StackMap locals: org.apache.fop.pdf.PDFPages java.lang.StringBuffer top java.util.Iterator
      StackMap stack:
         5: aload 3
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            astore 2 /* kid */
        start local 2 // java.lang.Object kid
         6: .line 114
            aload 2 /* kid */
            ifnonnull 8
         7: .line 115
            new java.lang.IllegalStateException
            dup
            ldc "Gap in the kids list!"
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
         8: .line 117
      StackMap locals: org.apache.fop.pdf.PDFPages java.lang.StringBuffer java.lang.Object java.util.Iterator
      StackMap stack:
            aload 1 /* sb */
            aload 2 /* kid */
            invokevirtual java.lang.StringBuffer.append:(Ljava/lang/Object;)Ljava/lang/StringBuffer;
            ldc " "
            invokevirtual java.lang.StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;
            pop
        end local 2 // java.lang.Object kid
         9: .line 113
      StackMap locals: org.apache.fop.pdf.PDFPages java.lang.StringBuffer top java.util.Iterator
      StackMap stack:
            aload 3
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 5
        10: .line 119
            aload 1 /* sb */
            ldc "] >>"
            invokevirtual java.lang.StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;
            pop
        11: .line 120
            aload 1 /* sb */
            invokevirtual java.lang.StringBuffer.toString:()Ljava/lang/String;
            areturn
        end local 1 // java.lang.StringBuffer sb
        end local 0 // org.apache.fop.pdf.PDFPages this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   12     0  this  Lorg/apache/fop/pdf/PDFPages;
            1   12     1    sb  Ljava/lang/StringBuffer;
            6    9     2   kid  Ljava/lang/Object;
}
SourceFile: "PDFPages.java"