/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2017 iText Group NV
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * This program 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 Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */
package com.itextpdf.text.pdf;

/**
 * A signature field lock dictionary.
 */
public class PdfSigLockDictionary extends PdfDictionary  {
	
	/**
	 * Enumerates the different actions of a signature lock.
	 * Indicates the set of fields that should be locked:
	 * all the fields in the document,
	 * all the fields specified in the /Fields array
	 * all the fields except those specified in the /Fields array
	 */
	public enum LockAction {
		ALL(PdfName.ALL), INCLUDE(PdfName.INCLUDE), EXCLUDE(PdfName.EXCLUDE);
		
		private PdfName name;
		
		private LockAction(PdfName name) {
			this.name = name;
		}
		
		public PdfName getValue() {
			return name;
		}
	}

	/**
	 * Enumerates the different levels of permissions.
	 */
	public enum LockPermissions {
		NO_CHANGES_ALLOWED(1), FORM_FILLING(2), FORM_FILLING_AND_ANNOTATION(3);
		
		private PdfNumber number;
		
		private LockPermissions(int p) {
			number = new PdfNumber(p);
		}
		
		public PdfNumber getValue() {
			return number;
		}
	}
	
	/**
	 * Creates a signature lock valid for all fields in the document.
	 */
	public PdfSigLockDictionary() {
		super(PdfName.SIGFIELDLOCK);
		this.put(PdfName.ACTION, LockAction.ALL.getValue());
	}
	
	/**
	 * Creates a signature lock for all fields in the document,
	 * setting specific permissions.
	 */
	public PdfSigLockDictionary(LockPermissions p) {
		this();
		this.put(PdfName.P, p.getValue());
	}
	
	/**
	 * Creates a signature lock for specific fields in the document.
	 */
	public PdfSigLockDictionary(LockAction action, String... fields) {
		this(action, null, fields);
	}
	
	/**
	 * Creates a signature lock for specific fields in the document.
	 */
	public PdfSigLockDictionary(LockAction action, LockPermissions p, String... fields) {
		super(PdfName.SIGFIELDLOCK);
		this.put(PdfName.ACTION, action.getValue());
		if (p != null)
			this.put(PdfName.P, p.getValue());
		PdfArray fieldsArray = new PdfArray();
		for (String field : fields) {
			fieldsArray.add(new PdfString(field));
		}
		this.put(PdfName.FIELDS, fieldsArray);
	}
}
