acrofields.java

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/*
 * Copyright 2003-2005 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.
 *
 * 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.lowagie.text.pdf;

import java.awt.Color;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.w3c.dom.Node;

import com.lowagie.text.DocumentException;
import com.lowagie.text.Element;
import com.lowagie.text.ExceptionConverter;
import com.lowagie.text.Image;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.codec.Base64;

/** Query and change fields in existing documents either by method
 * calls or by FDF merging.
 * @author Paulo Soares ([e-mail])
 */
public class AcroFields {

    PdfReader reader;
    PdfWriter writer;
    HashMap fields;
    private int topFirst;
    private HashMap sigNames;
    private boolean append;
    public static final int DA_FONT = 0;
    public static final int DA_SIZE = 1;
    public static final int DA_COLOR = 2;
    private HashMap extensionFonts = new HashMap();
    private XfaForm xfa;
    /**
     * A field type invalid or not found.
     */    
    public static final int FIELD_TYPE_NONE = 0;
    /**
     * A field type.
     */    
    public static final int FIELD_TYPE_PUSHBUTTON = 1;
    /**
     * A field type.
     */    
    public static final int FIELD_TYPE_CHECKBOX = 2;
    /**
     * A field type.
     */    
    public static final int FIELD_TYPE_RADIOBUTTON = 3;
    /**
     * A field type.
     */    
    public static final int FIELD_TYPE_TEXT = 4;
    /**
     * A field type.
     */    
    public static final int FIELD_TYPE_LIST = 5;
    /**
     * A field type.
     */    
    public static final int FIELD_TYPE_COMBO = 6;
    /**
     * A field type.
     */    
    public static final int FIELD_TYPE_SIGNATURE = 7;
    
    private boolean lastWasString;
    
    /** Holds value of property generateAppearances. */
    private boolean generateAppearances = true;
    
    private HashMap localFonts = new HashMap();
    
    private float extraMarginLeft;
    private float extraMarginTop;
    private ArrayList substitutionFonts;
    
    AcroFields(PdfReader reader, PdfWriter writer) {
        this.reader = reader;
        this.writer = writer;
        try {
            xfa = new XfaForm(reader);
        }
        catch (Exception e) {
            throw new ExceptionConverter(e);
        }
        if (writer instanceof PdfStamperImp) {
            append = ((PdfStamperImp)writer).isAppend();
        }
        fill();
    }

    void fill() {
        fields = new HashMap();
        PdfDictionary top = (PdfDictionary)PdfReader.getPdfObjectRelease(reader.getCatalog().get(PdfName.ACROFORM));
        if (top == null)
            return;
        PdfArray arrfds = (PdfArray)PdfReader.getPdfObjectRelease(top.get(PdfName.FIELDS));
        if (arrfds == null || arrfds.size() == 0)
            return;
        arrfds = null;
        for (int k = 1; k <= reader.getNumberOfPages(); ++k) {
            PdfDictionary page = reader.getPageNRelease(k);
            PdfArray annots = (PdfArray)PdfReader.getPdfObjectRelease(page.get(PdfName.ANNOTS), page);
            if (annots == null)
                continue;
            ArrayList arr = annots.getArrayList();
            for (int j = 0; j < arr.size(); ++j) {
                PdfObject annoto = PdfReader.getPdfObject((PdfObject)arr.get(j), annots);
                if (!(annoto instanceof PdfDictionary)) {
                    PdfReader.releaseLastXrefPartial((PdfObject)arr.get(j));
                    continue;
                }
                PdfDictionary annot = (PdfDictionary)annoto;
                if (!PdfName.WIDGET.equals(annot.get(PdfName.SUBTYPE))) {
                    PdfReader.releaseLastXrefPartial((PdfObject)arr.get(j));
                    continue;
                }
                PdfDictionary widget = annot;
                PdfDictionary dic = new PdfDictionary();
                dic.putAll(annot);
                String name = "";
                PdfDictionary value = null;
                PdfObject lastV = null;
                while (annot != null) {
                    dic.mergeDifferent(annot);
                    PdfString t = (PdfString)PdfReader.getPdfObject(annot.get(PdfName.T));
                    if (t != null)
                        name = t.toUnicodeString() + "." + name;
                    if (lastV == null && annot.get(PdfName.V) != null)
                        lastV = PdfReader.getPdfObjectRelease(annot.get(PdfName.V));
                    if (value == null &&  t != null) {
                        value = annot;
                        if (annot.get(PdfName.V) == null && lastV  != null)
                            value.put(PdfName.V, lastV);
                    }
                    annot = (PdfDictionary)PdfReader.getPdfObject(annot.get(PdfName.PARENT), annot);
                }
                if (name.length() > 0)
                    name = name.substring(0, name.length() - 1);
                Item item = (Item)fields.get(name);
                if (item == null) {
                    item = new Item();
                    fields.put(name, item);
                }
                if (value == null)
                    item.values.add(widget);
                else
                    item.values.add(value);
                item.widgets.add(widget);
                item.widget_refs.add(arr.get(j)); // must be a reference
                if (top != null)
                    dic.mergeDifferent(top);
                item.merged.add(dic);
                item.page.add(new Integer(k));
                item.tabOrder.add(new Integer(j));
            }
        }
    }
    
    /** Gets the list of appearance names. Use it to get the names allowed
     * with radio and checkbox fields. If the /Opt key exists the values will
     * also be included. The name 'Off' may also be valid
     * even if not returned in the list.
     * @param fieldName the fully qualified field name
     * @return the list of names or <CODE>null</CODE> if the field does not exist
     */    
    public String[] getAppearanceStates(String fieldName) {
        Item fd = (Item)fields.get(fieldName);
        if (fd == null)
            return null;
        HashMap names = new HashMap();
        PdfDictionary vals = (PdfDictionary)fd.values.get(0);
        PdfObject opts = PdfReader.getPdfObject(vals.get(PdfName.OPT));
        if (opts != null) {
            if (opts.isString())
                names.put(((PdfString)opts).toUnicodeString(), null);
            else if (opts.isArray()) {
                ArrayList list = ((PdfArray)opts).getArrayList();
                for (int k = 0; k < list.size(); ++k) {
                    PdfObject v = PdfReader.getPdfObject((PdfObject)list.get(k));
                    if (v != null && v.isString())
                        names.put(((PdfString)v).toUnicodeString(), null);
                }
            }
        }
        ArrayList wd = fd.widgets;
        for (int k = 0; k < wd.size(); ++k) {
            PdfDictionary dic = (PdfDictionary)wd.get(k);
            dic = (PdfDictionary)PdfReader.getPdfObject(dic.get(PdfName.AP));
            if (dic == null)
                continue;
            PdfObject ob = PdfReader.getPdfObject(dic.get(PdfName.N));
            if (ob == null || !ob.isDictionary())
                continue;
            dic = (PdfDictionary)ob;
            for (Iterator it = dic.getKeys().iterator(); it.hasNext();) {
                String name = PdfName.decodeName(((PdfName)it.next()).toString());
                names.put(name, null);
            }
        }
        String out[] = new String[names.size()];
        return (String[])names.keySet().toArray(out);
    }
    
    private String[] getListOption(String fieldName, int idx) {
        Item fd = getFieldItem(fieldName);
        if (fd == null)
            return null;
        PdfObject obj = PdfReader.getPdfObject(((PdfDictionary)fd.merged.get(0)).get(PdfName.OPT));
        if (obj == null || !obj.isArray())
            return null;
        PdfArray ar = (PdfArray)obj;
        String[] ret = new String[ar.size()];
        ArrayList a = ar.getArrayList();
        for (int k = 0; k < a.size(); ++k) {
            obj = PdfReader.getPdfObject((PdfObject)a.get(k));
            try {
                if (obj.isArray()) {
                    obj = (PdfObject)((PdfArray)obj).getArrayList().get(idx);
                }
                if (obj.isString())
                    ret[k] = ((PdfString)obj).toUnicodeString();
                else
                    ret[k] = obj.toString();
            }
            catch (Exception e) {
                ret[k] = "";
            }
        }
        return ret;
    }
    
    /**
     * Gets the list of export option values from fields of type list or combo.
     * If the field doesn't exist or the field type is not list or combo it will return
     * <CODE>null</CODE>.
     * @param fieldName the field name