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iTechSharp/iTextSharp/text/pdf/XfdfReader.cs
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iTechSharp/iTextSharp/text/pdf/XfdfReader.cs
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using System;
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using System.IO;
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using System.Collections;
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using iTextSharp.text.xml.simpleparser;
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/*
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*
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* Copyright 2004 by Leonard Rosenthol.
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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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* 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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* Reads a XFDF.
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* @author Leonard Rosenthol (leonardr@pdfsages.com)
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*/
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public class XfdfReader : ISimpleXMLDocHandler {
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// stuff used during parsing to handle state
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private bool foundRoot = false;
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private Stackr fieldNames = new Stackr();
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private Stackr fieldValues = new Stackr();
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// storage for the field list and their values
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internal Hashtable fields;
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// storage for the path to referenced PDF, if any
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internal String fileSpec;
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/** Reads an XFDF form.
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* @param filename the file name of the form
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* @throws IOException on error
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*/
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public XfdfReader(String filename) {
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FileStream fin = null;
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try {
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fin = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read);
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SimpleXMLParser.Parse(this, fin);
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}
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finally {
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try{if (fin != null) fin.Close();}catch{}
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}
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}
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/** Reads an XFDF form.
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* @param xfdfIn the byte array with the form
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* @throws IOException on error
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*/
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public XfdfReader(byte[] xfdfIn) {
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SimpleXMLParser.Parse( this, new MemoryStream(xfdfIn));
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}
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/** Gets all the fields. The map is keyed by the fully qualified
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* field name and the value is a merged <CODE>PdfDictionary</CODE>
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* with the field content.
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* @return all the fields
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*/
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public Hashtable Fields {
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get {
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return fields;
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}
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}
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/** Gets the field value.
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* @param name the fully qualified field name
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* @return the field's value
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*/
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public String GetField(String name) {
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return (String)fields[name];
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}
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/** Gets the field value or <CODE>null</CODE> if the field does not
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* exist or has no value defined.
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* @param name the fully qualified field name
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* @return the field value or <CODE>null</CODE>
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*/
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public String GetFieldValue(String name) {
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String field = (String)fields[name];
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if (field == null)
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return null;
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else
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return field;
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}
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/** Gets the PDF file specification contained in the FDF.
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* @return the PDF file specification contained in the FDF
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*/
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public String FileSpec {
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get {
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return fileSpec;
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}
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}
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/**
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* Called when a start tag is found.
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* @param tag the tag name
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* @param h the tag's attributes
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*/
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public void StartElement(String tag, Hashtable h) {
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if ( !foundRoot ) {
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if (!tag.Equals("xfdf"))
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throw new Exception("Root element is not Bookmark.");
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else
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foundRoot = true;
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}
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if ( tag.Equals("xfdf") ){
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} else if ( tag.Equals("f") ) {
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fileSpec = (String)h[ "href" ];
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} else if ( tag.Equals("fields") ) {
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fields = new Hashtable(); // init it!
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} else if ( tag.Equals("field") ) {
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String fName = (String) h[ "name" ];
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fieldNames.Push( fName );
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} else if ( tag.Equals("value") ) {
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fieldValues.Push("");
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}
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}
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/**
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* Called when an end tag is found.
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* @param tag the tag name
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*/
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public void EndElement(String tag) {
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if ( tag.Equals("value") ) {
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String fName = "";
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for (int k = 0; k < fieldNames.Count; ++k) {
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fName += "." + (String)fieldNames[k];
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}
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if (fName.StartsWith("."))
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fName = fName.Substring(1);
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String fVal = (String) fieldValues.Pop();
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fields[fName] = fVal;
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}
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else if (tag.Equals("field") ) {
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if (fieldNames.Count != 0)
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fieldNames.Pop();
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}
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}
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/**
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* Called when the document starts to be parsed.
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*/
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public void StartDocument()
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{
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fileSpec = ""; // and this too...
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}
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/**
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* Called after the document is parsed.
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*/
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public void EndDocument()
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{
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}
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/**
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* Called when a text element is found.
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* @param str the text element, probably a fragment.
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*/
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public void Text(String str)
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{
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if (fieldNames.Count == 0 || fieldValues.Count == 0)
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return;
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String val = (String)fieldValues.Pop();
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val += str;
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fieldValues.Push(val);
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}
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internal class Stackr : ArrayList {
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internal void Push(object obj) {
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Add(obj);
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}
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internal object Pop() {
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if (Count == 0)
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throw new InvalidOperationException("The stack is empty.");
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object obj = this[Count - 1];
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RemoveAt(Count - 1);
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return obj;
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}
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}
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}
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}
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