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/*
* $Id: PRAcroForm.java 3735 2009-02-26 01:44:03Z xlv $
*
* Copyright 2001, 2002 by Paulo Soares.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (the "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* This class written by Mark Thompson, Copyright (C) 2002 by Mark Thompson.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.aowagie.text.pdf;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
/**
* This class captures an AcroForm on input. Basically, it extends Dictionary
* by indexing the fields of an AcroForm
* @author Mark Thompson
*/
public class PRAcroForm extends PdfDictionary {
/**
* This class holds the information for a single field
*/
public static class FieldInformation {
private final String name;
private final PdfDictionary info;
private final PRIndirectReference ref;
private FieldInformation(final String name, final PdfDictionary info, final PRIndirectReference ref) {
this.name = name; this.info = info; this.ref = ref;
}
public String getName() { return this.name; }
public PdfDictionary getInfo() { return this.info; }
public PRIndirectReference getRef() { return this.ref; }
}
private final ArrayList fields;
private final ArrayList stack;
private final HashMap fieldByName;
private final PdfReader reader;
/**
* Constructor
* @param reader reader of the input file
*/
PRAcroForm(final PdfReader reader) {
this.reader = reader;
this.fields = new ArrayList();
this.fieldByName = new LinkedHashMap();
this.stack = new ArrayList();
}
/**
* Number of fields found
* @return size
*/
@Override
public int size() {
return this.fields.size();
}
public ArrayList getFields() {
return this.fields;
}
/**
* Read, and comprehend the acroform
* @param root the document root
*/
void readAcroForm(final PdfDictionary root) {
if (root == null) {
return;
}
this.hashMap = root.hashMap;
pushAttrib(root);
final PdfArray fieldlist = (PdfArray)PdfReader.getPdfObjectRelease(root.get(PdfName.FIELDS));
iterateFields(fieldlist, null, null);
}
/**
* After reading, we index all of the fields. Recursive.
* @param fieldlist An array of fields
* @param fieldDict the last field dictionary we encountered (recursively)
* @param title the pathname of the field, up to this point or null
*/
private void iterateFields(final PdfArray fieldlist, final PRIndirectReference fieldDict, final String title) {
for (final Iterator it = fieldlist.listIterator(); it.hasNext();) {
final PRIndirectReference ref = (PRIndirectReference)it.next();
final PdfDictionary dict = (PdfDictionary) PdfReader.getPdfObjectRelease(ref);
// if we are not a field dictionary, pass our parent's values
PRIndirectReference myFieldDict = fieldDict;
String myTitle = title;
final PdfString tField = (PdfString)dict.get(PdfName.T);
final boolean isFieldDict = tField != null;
if (isFieldDict) {
myFieldDict = ref;
if (title == null) {
myTitle = tField.toString();
} else {
myTitle = title + '.' + tField.toString();
}
}
final PdfArray kids = (PdfArray)dict.get(PdfName.KIDS);
if (kids != null) {
pushAttrib(dict);
iterateFields(kids, myFieldDict, myTitle);
this.stack.remove(this.stack.size() - 1); // pop
}
else { // leaf node
if (myFieldDict != null) {
PdfDictionary mergedDict = (PdfDictionary)this.stack.get(this.stack.size() - 1);
if (isFieldDict) {
mergedDict = mergeAttrib(mergedDict, dict);
}
mergedDict.put(PdfName.T, new PdfString(myTitle));
final FieldInformation fi = new FieldInformation(myTitle, mergedDict, myFieldDict);
this.fields.add(fi);
this.fieldByName.put(myTitle, fi);
}
}
}
}
/**
* merge field attributes from two dictionaries
* @param parent one dictionary
* @param child the other dictionary
* @return a merged dictionary
*/
private PdfDictionary mergeAttrib(final PdfDictionary parent, final PdfDictionary child) {
final PdfDictionary targ = new PdfDictionary();
if (parent != null) {
targ.putAll(parent);
}
for (final Object element : child.getKeys()) {
final PdfName key = (PdfName) element;
if (key.equals(PdfName.DR) || key.equals(PdfName.DA) ||
key.equals(PdfName.Q) || key.equals(PdfName.FF) ||
key.equals(PdfName.DV) || key.equals(PdfName.V)
|| key.equals(PdfName.FT)
|| key.equals(PdfName.F)) {
targ.put(key,child.get(key));
}
}
return targ;
}
/**
* stack a level of dictionary. Merge in a dictionary from this level
*/
private void pushAttrib(final PdfDictionary dict) {
PdfDictionary dic = null;
if (!this.stack.isEmpty()) {
dic = (PdfDictionary)this.stack.get(this.stack.size() - 1);
}
dic = mergeAttrib(dic, dict);
this.stack.add(dic);
}
}
