Android FileReader Read readProtocols(String file)

Description

Read SSL/TLS protocols from a file.

License

Open Source License

Parameter

Parameter	Description
file	The file to read SSL/TLS protocols from

Return

SSL/TLS protocols loaded from the file or null if there was a problem loading them

Declaration

public static String[] readProtocols(String file) 

Method Source Code

//package com.java2s;
/**/*from  w ww.  ja v  a 2s  .c  o  m*/
 * This file is part of SecureNIO. Copyright (C) 2014 K. Dermitzakis
 * <dermitza@gmail.com>
 *
 * SecureNIO is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any
 * later version.
 *
 * SecureNIO 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 SecureNIO. If not, see <http://www.gnu.org/licenses/>.
 */

import java.io.FileReader;
import java.io.IOException;
import java.io.LineNumberReader;
import java.util.ArrayList;

public class Main {
    private static LineNumberReader lr;
    private static FileReader fr;
    private static ArrayList<String> lines;

    /**
     * Read SSL/TLS protocols from a file. If it cannot read the file for any
     * reason null is returned
     *
     * @param file The file to read SSL/TLS protocols from
     * @return SSL/TLS protocols loaded from the file or null if there was a
     * problem loading them
     */
    public static String[] readProtocols(String file) {
        try {
            return readLines(file);
        } catch (IOException ioe) {
            System.err.println("Error reading protocols from: " + file);
            System.err.println(ioe.getMessage());
            return null;
        }
    }

    /**
     * Generic read line method implementation from a file. This implementation
     * allows empty lines and comment lines beginning with #. The method is used
     * by both {@link #readProtocols(java.lang.String)} and
     * {@link #readCipherSuites(java.lang.String)} and as such, these methods do
     * not distinguish between protocols and cipher suites.
     *
     *
     * @param file The file to read lines from
     * @return A string array containing the valid lines read or null if there
     * was an error reading the lines
     * @throws IOException If there is any error while trying to read from the
     * file provided
     */
    private static String[] readLines(String file) throws IOException {
        String line;
        fr = new FileReader(file);
        lines = new ArrayList<>();
        lr = new LineNumberReader(fr);
        while ((line = lr.readLine()) != null) {
            if (!line.startsWith("#") && !line.isEmpty()) {
                lines.add(line);
            }
        }
        fr.close();
        lr.close();
        String[] ret = lines.toArray(new String[0]);
        lines.clear();
        lines = null;
        fr = null;
        lr = null;
        return ret;
    }
}

Related

1. read(File file)
2. read(String file)
3. read(String fileName)