itextpdf-master/itext/src/main/java/com/itextpdf/text/pdf/collection/PdfCollectionSort.java
/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2022 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.collection;

import com.itextpdf.text.pdf.PdfArray;
import com.itextpdf.text.pdf.PdfBoolean;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfObject;
import com.itextpdf.text.error_messages.MessageLocalization;

public class PdfCollectionSort extends PdfDictionary {
	
	/**
	 * Constructs a PDF Collection Sort Dictionary.
	 * @param key	the key of the field that will be used to sort entries
	 */
	public PdfCollectionSort(String key) {
		super(PdfName.COLLECTIONSORT);
		put(PdfName.S, new PdfName(key));
	}
	
	/**
	 * Constructs a PDF Collection Sort Dictionary.
	 * @param keys	the keys of the fields that will be used to sort entries
	 */
	public PdfCollectionSort(String[] keys) {
		super(PdfName.COLLECTIONSORT);
		PdfArray array = new PdfArray();
		for (int i = 0; i < keys.length; i++) {
			array.add(new PdfName(keys[i]));
		}
		put(PdfName.S, array);
	}
	
	/**
	 * Defines the sort order of the field (ascending or descending).
	 * @param ascending	true is the default, use false for descending order
	 */
	public void setSortOrder(boolean ascending) {
		PdfObject o = get(PdfName.S);
		if (o instanceof PdfName) {
			put(PdfName.A, new PdfBoolean(ascending));
		}
		else {
			throw new IllegalArgumentException(MessageLocalization.getComposedMessage("you.have.to.define.a.boolean.array.for.this.collection.sort.dictionary"));
		}
	}
	
	/**
	 * Defines the sort order of the field (ascending or descending).
	 * @param ascending	an array with every element corresponding with a name of a field.
	 */
	public void setSortOrder(boolean[] ascending) {
		PdfObject o = get(PdfName.S);
		if (o instanceof PdfArray) {
			if (((PdfArray)o).size() != ascending.length) {
				throw new IllegalArgumentException(MessageLocalization.getComposedMessage("the.number.of.booleans.in.this.array.doesn.t.correspond.with.the.number.of.fields"));
			}
			PdfArray array = new PdfArray();
			for (int i = 0; i < ascending.length; i++) {
				array.add(new PdfBoolean(ascending[i]));
			}
			put(PdfName.A, array);
		}
		else {
			throw new IllegalArgumentException(MessageLocalization.getComposedMessage("you.need.a.single.boolean.for.this.collection.sort.dictionary"));
		}
	}
	
	
}
