http://xmlgraphics.apache.org/fop/: Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF. (Apache Software Foundation) 
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id: PDFEmbeddedFiles.java 1761021 2016-09-16 11:40:57Z ssteiner $ */

package org.apache.fop.pdf;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.SortedMap;


Class representing an /EmbeddedFiles dictionary object (name tree).

/**
 * Class representing an /EmbeddedFiles dictionary object (name tree).
 */
public class PDFEmbeddedFiles extends PDFNameTreeNode {

    
Create a /EmbeddedFiles dictionary.

/**
     * Create a /EmbeddedFiles dictionary.
     */
    public PDFEmbeddedFiles() {
        super();
    }

    
{@inheritDoc} 
/** {@inheritDoc} */
    protected void writeDictionary(OutputStream out, StringBuilder textBuffer) throws IOException {
        sortNames(); //Sort the names before writing them out
        super.writeDictionary(out, textBuffer);
    }

    private void sortNames() {
        PDFArray names = getNames();
        SortedMap map = new java.util.TreeMap();
        int i = 0;
        int c = names.length();
        while (i < c) {
            Comparable key = (Comparable)names.get(i++); //Key must be a Comparable for sorting
            Object value = names.get(i++);
            map.put(key, value);
        }
        names.clear();
        for (Object o : map.entrySet()) {
            Map.Entry entry = (Map.Entry) o;
            names.add(entry.getKey());
            names.add(entry.getValue());
        }
    }
}