Java File Append Text appendToString(final byte b, final Appendable ap)

Description

Appends a two-character hexadecimal representation of the supplied byte to the supplied string appender.

License

Open Source License

Parameter

Parameter	Description
b	the byte to format
ap	the character sequence to append to

Exception

Parameter	Description
IllegalStateException	DOCUMENT ME!

Return

the same appendable supplied as an input parameter

Declaration

public static Appendable appendToString(final byte b, final Appendable ap) 

Method Source Code

//package com.java2s;
/*// w ww . j  a v  a  2s  .c o  m
 * Copyright (c) 2008 Kevin Brockhoff
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import java.io.IOException;

public class Main {
    private static final String HEX_CHARS = "0123456789abcdefABCDEF";

    /**
     * Appends a two-character hexadecimal representation of the supplied byte to the supplied string appender.
     *
     * @param  b  the byte to format
     * @param  ap  the character sequence to append to
     *
     * @return  the same appendable supplied as an input parameter
     *
     * @throws  IllegalStateException  DOCUMENT ME!
     */
    public static Appendable appendToString(final byte b, final Appendable ap) {
        final int hex = b & 0xFF;

        try {
            ap.append(HEX_CHARS.charAt(hex >> 4));
            ap.append(HEX_CHARS.charAt(hex & 0x0f));
        } catch (IOException e) {
            throw new IllegalStateException(e);
        }

        return ap;
    }

    /**
     * Appends a two-character hexadecimal representation of each byte in the specified range of the supplied byte array
     * to the supplied string appender.
     *
     * @param  raw  the byte array to format
     * @param  start  the array index value to begin at
     * @param  len  the number of bytes to format
     * @param  ap  the character sequence to append to
     *
     * @return  the same appendable supplied as an input parameter
     *
     * @throws  IllegalArgumentException  DOCUMENT ME!
     */
    public static Appendable appendToString(final byte[] raw, final int start, final int len, final Appendable ap) {

        if (start + len > raw.length) {
            throw new IllegalArgumentException("exceeds byte array length");
        }

        for (int i = start; i < start + len; i++) {
            appendToString(raw[i], ap);
        }

        return ap;
    }

    /**
     * Appends a two-character hexadecimal representation of each byte in the supplied byte array to the supplied string
     * appender.
     *
     * @param  raw  the byte array to format
     * @param  ap  the character sequence to append to
     *
     * @return  the same appendable supplied as an input parameter
     */
    public static Appendable appendToString(final byte[] raw, final Appendable ap) {
        return appendToString(raw, 0, raw.length, ap);
    }

    /**
     * Appends two bytes array into one.
     *
     * @param  a  the first array
     * @param  b  the following array
     *
     * @return  the combined array
     */
    public static byte[] append(final byte[] a, final byte[] b) {
        final byte[] result = new byte[a.length + b.length];
        System.arraycopy(a, 0, result, 0, a.length);
        System.arraycopy(b, 0, result, a.length, b.length);

        return result;
    }
}

Related

1. appendToFile(String filepath, String newLine)
2. appendToFile(String sb, String directory, String fileName)
3. appendToFile(String str, String filename, boolean appendNewLine)
4. appendToFile(String string, File file)
5. appendToFile(String text, String fileName)
6. appendToTextFile(final File file, final String text)
7. appendToTextFile(String contents, String fullPathFilename)