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iTechSharp/iTextSharp/text/pdf/PRAcroForm.cs
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iTechSharp/iTextSharp/text/pdf/PRAcroForm.cs
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using System;
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using System.Collections;
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/*
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* $Id: PRAcroForm.cs,v 1.5 2008/05/13 11:25:23 psoares33 Exp $
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*
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*
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* Copyright 2001, 2002 by Paulo Soares.
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* (the "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the License.
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*
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* The Original Code is 'iText, a free JAVA-PDF library'.
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*
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* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
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* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
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* All Rights Reserved.
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* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
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* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
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*
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* This class written by Mark Thompson, Copyright (C) 2002 by Mark Thompson.
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*
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* Contributor(s): all the names of the contributors are added in the source code
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* where applicable.
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*
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* Alternatively, the contents of this file may be used under the terms of the
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* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
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* provisions of LGPL are applicable instead of those above. If you wish to
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* allow use of your version of this file only under the terms of the LGPL
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* License and not to allow others to use your version of this file under
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* the MPL, indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by the LGPL.
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* If you do not delete the provisions above, a recipient may use your version
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* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the MPL as stated above or under the terms of the GNU
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* Library General Public License as published by the Free Software Foundation;
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* either version 2 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
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* details.
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*
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* If you didn't download this code from the following link, you should check if
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* you aren't using an obsolete version:
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* http://www.lowagie.com/iText/
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*/
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namespace iTextSharp.text.pdf {
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/**
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* This class captures an AcroForm on input. Basically, it extends Dictionary
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* by indexing the fields of an AcroForm
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* @author Mark Thompson
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*/
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public class PRAcroForm : PdfDictionary {
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/**
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* This class holds the information for a single field
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*/
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public class FieldInformation {
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internal String name;
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internal PdfDictionary info;
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internal PRIndirectReference refi;
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internal FieldInformation(String name, PdfDictionary info, PRIndirectReference refi) {
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this.name = name; this.info = info; this.refi = refi;
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}
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public String Name {
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get {
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return name;
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}
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}
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public PdfDictionary Info {
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get {
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return info;
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}
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}
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public PRIndirectReference Ref {
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get {
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return refi;
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}
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}
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}
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internal ArrayList fields;
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internal ArrayList stack;
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internal Hashtable fieldByName;
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internal PdfReader reader;
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/**
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* Constructor
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* @param reader reader of the input file
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*/
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public PRAcroForm(PdfReader reader) {
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this.reader = reader;
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fields = new ArrayList();
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fieldByName = new Hashtable();
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stack = new ArrayList();
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}
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/**
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* Number of fields found
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* @return size
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*/
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public new int Size {
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get {
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return fields.Count;
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}
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}
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public ArrayList Fields {
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get {
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return fields;
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}
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}
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public FieldInformation GetField(String name) {
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return (FieldInformation)fieldByName[name];
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}
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/**
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* Given the title (/T) of a reference, return the associated reference
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* @param name a string containing the path
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* @return a reference to the field, or null
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*/
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public PRIndirectReference GetRefByName(String name) {
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FieldInformation fi = (FieldInformation)fieldByName[name];
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if (fi == null) return null;
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return fi.Ref;
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}
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/**
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* Read, and comprehend the acroform
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* @param root the docment root
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*/
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public void ReadAcroForm(PdfDictionary root) {
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if (root == null)
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return;
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hashMap = root.hashMap;
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PushAttrib(root);
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PdfArray fieldlist = (PdfArray)PdfReader.GetPdfObjectRelease(root.Get(PdfName.FIELDS));
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IterateFields(fieldlist, null, null);
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}
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/**
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* After reading, we index all of the fields. Recursive.
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* @param fieldlist An array of fields
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* @param fieldDict the last field dictionary we encountered (recursively)
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* @param title the pathname of the field, up to this point or null
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*/
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protected void IterateFields(PdfArray fieldlist, PRIndirectReference fieldDict, String title) {
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foreach (PRIndirectReference refi in fieldlist.ArrayList) {
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PdfDictionary dict = (PdfDictionary) PdfReader.GetPdfObjectRelease(refi);
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// if we are not a field dictionary, pass our parent's values
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PRIndirectReference myFieldDict = fieldDict;
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String myTitle = title;
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PdfString tField = (PdfString)dict.Get(PdfName.T);
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bool isFieldDict = tField != null;
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if (isFieldDict) {
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myFieldDict = refi;
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if (title == null) myTitle = tField.ToString();
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else myTitle = title + '.' + tField.ToString();
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}
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PdfArray kids = (PdfArray)dict.Get(PdfName.KIDS);
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if (kids != null) {
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PushAttrib(dict);
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IterateFields(kids, myFieldDict, myTitle);
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stack.RemoveAt(stack.Count - 1); // pop
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}
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else { // leaf node
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if (myFieldDict != null) {
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PdfDictionary mergedDict = (PdfDictionary)stack[stack.Count - 1];
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if (isFieldDict)
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mergedDict = MergeAttrib(mergedDict, dict);
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mergedDict.Put(PdfName.T, new PdfString(myTitle));
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FieldInformation fi = new FieldInformation(myTitle, mergedDict, myFieldDict);
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fields.Add(fi);
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fieldByName[myTitle] = fi;
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}
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}
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}
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}
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/**
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* merge field attributes from two dictionaries
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* @param parent one dictionary
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* @param child the other dictionary
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* @return a merged dictionary
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*/
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protected PdfDictionary MergeAttrib(PdfDictionary parent, PdfDictionary child) {
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PdfDictionary targ = new PdfDictionary();
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if (parent != null) targ.Merge(parent);
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foreach (PdfName key in child.Keys) {
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if (key.Equals(PdfName.DR) || key.Equals(PdfName.DA) ||
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key.Equals(PdfName.Q) || key.Equals(PdfName.FF) ||
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key.Equals(PdfName.DV) || key.Equals(PdfName.V)
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|| key.Equals(PdfName.FT)
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|| key.Equals(PdfName.F)) {
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targ.Put(key,child.Get(key));
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}
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}
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return targ;
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}
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/**
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* stack a level of dictionary. Merge in a dictionary from this level
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*/
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protected void PushAttrib(PdfDictionary dict) {
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PdfDictionary dic = null;
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if (stack.Count != 0) {
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dic = (PdfDictionary)stack[stack.Count - 1];
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}
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dic = MergeAttrib(dic, dict);
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stack.Add(dic);
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}
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}
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}
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