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/*
* $Id$
* Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources.
*/
package org.apache.fop.pdf;
import java.util.Vector;
/**
* This represents a single Outline object in a PDF, including the root Outlines
* object. Outlines provide the bookmark bar, usually rendered to the right of
* a PDF document in user agents such as Acrobat Reader
*
* @author Kelly A. Campbell
*
*/
public class PDFOutline extends PDFObject {
/**
* list of sub-entries (outline objects)
*/
private Vector _subentries;
/**
* parent outline object. Root Outlines parent is null
*/
private PDFOutline _parent;
private PDFOutline _prev;
private PDFOutline _next;
private PDFOutline _first;
private PDFOutline _last;
private int _count;
/**
* title to display for the bookmark entry
*/
private String _title;
String _actionRef;
/**
* @param number the object id number
* @param title the title of the outline entry (can only be null for root Outlines obj)
* @param page the page which this outline refers to.
*/
public PDFOutline(int number, String title, String action) {
super(number);
_subentries = new Vector();
_count = 0;
_parent = null;
_prev = null;
_next = null;
_first = null;
_last = null;
_title = title;
_actionRef = action;
}
public void setTitle(String title) {
_title = title;
}
/**
* Add a sub element to this outline
*/
public void addOutline(PDFOutline outline) {
if (_subentries.size() > 0) {
outline._prev =
(PDFOutline)_subentries.elementAt(_subentries.size() - 1);
outline._prev._next = outline;
} else {
_first = outline;
}
_subentries.addElement(outline);
outline._parent = this;
incrementCount(); // note: count is not just the immediate children
_last = outline;
}
private void incrementCount() {
// count is a total of our immediate subentries and all descendent subentries
_count++;
if (_parent != null) {
_parent.incrementCount();
}
}
/**
* represent the object in PDF
*/
protected byte[] toPDF() {
StringBuffer result = new StringBuffer(this.number + " "
+ this.generation
+ " obj\n<<\n");
if (_parent == null) {
// root Outlines object
if (_first != null && _last != null) {
result.append(" /First " + _first.referencePDF() + "\n");
result.append(" /Last " + _last.referencePDF() + "\n");
// no count... we start with the outline completely closed for now
}
} else {
// subentry Outline object
result.append(" /Title (" + escapeString(_title) + ")\n");
result.append(" /Parent " + _parent.referencePDF() + "\n");
if (_first != null && _last != null) {
result.append(" /First " + _first.referencePDF() + "\n");
result.append(" /Last " + _last.referencePDF() + "\n");
}
if (_prev != null) {
result.append(" /Prev " + _prev.referencePDF() + "\n");
}
if (_next != null) {
result.append(" /Next " + _next.referencePDF() + "\n");
}
if (_count > 0) {
result.append(" /Count -" + _count + "\n");
}
if (_actionRef != null) {
result.append(" /A " + _actionRef + "\n");
}
}
result.append(">> endobj\n");
return result.toString().getBytes();
}
/**
* escape parens, and other special chars for PDF
*/
private String escapeString(String s) {
StringBuffer result = new StringBuffer();
if (s != null) {
int l = s.length();
for (int i = 0; i < l; i++) {
char ch = s.charAt(i);
if (ch > 127) {
result.append("\\");
result.append(Integer.toOctalString((int)ch));
} else {
switch (ch) {
case '(':
case ')':
case '\\':
result.append('\\');
break;
}
result.append(ch);
}
}
}
return result.toString();
}
}
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