Decodes the specified sequence of bytes into a string using the US-ASCII charset. - Java java.nio

Java examples for java.nio:CharBuffer

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Description

Decodes the specified sequence of bytes into a string using the US-ASCII charset.

Demo Code

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 * 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   *
 *                                                              *
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import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;

public class Main{
    /**/*  w w w . j  a va  2 s .  co  m*/
     * Decodes the specified sequence of bytes into a string using the US-ASCII
     * charset.
     *
     * @param byteSequence
     *            sequence of bytes to decode.
     * @return decoded string.
     */
    public static String decode(ByteSequence byteSequence) {
        if (byteSequence == null) {
            return null;
        }
        return decode(byteSequence, 0, byteSequence.length());
    }
    /**
     * Decodes the specified sequence of bytes into a string using the specified
     * charset.
     *
     * @param charset
     *            Java charset to be used for the conversion.
     * @param byteSequence
     *            sequence of bytes to decode.
     * @return decoded string.
     */
    public static String decode(Charset charset, ByteSequence byteSequence) {
        return decode(charset, byteSequence, 0, byteSequence.length());
    }
    /**
     * Decodes a sub-sequence of the specified sequence of bytes into a string
     * using the US-ASCII charset.
     *
     * @param byteSequence
     *            sequence of bytes to decode.
     * @param offset
     *            offset into the byte sequence.
     * @param length
     *            number of bytes.
     * @return decoded string.
     */
    public static String decode(ByteSequence byteSequence, int offset,
            int length) {
        if (byteSequence == null) {
            return null;
        }
        StringBuilder buf = new StringBuilder(length);
        for (int i = offset; i < offset + length; i++) {
            buf.append((char) (byteSequence.byteAt(i) & 0xff));
        }
        return buf.toString();
    }
    /**
     * Decodes a sub-sequence of the specified sequence of bytes into a string
     * using the specified charset.
     *
     * @param charset
     *            Java charset to be used for the conversion.
     * @param byteSequence
     *            sequence of bytes to decode.
     * @param offset
     *            offset into the byte sequence.
     * @param length
     *            number of bytes.
     * @return decoded string.
     */
    public static String decode(Charset charset, ByteSequence byteSequence,
            int offset, int length) {
        if (byteSequence == null) {
            return null;
        }
        if (charset == null) {
            charset = Charset.defaultCharset();
        }
        if (byteSequence instanceof ByteArrayBuffer) {
            ByteArrayBuffer bab = (ByteArrayBuffer) byteSequence;
            return decode(charset, bab.buffer(), offset, length);
        } else {
            byte[] bytes = byteSequence.toByteArray();
            return decode(charset, bytes, offset, length);
        }
    }
    private static String decode(Charset charset, byte[] buffer,
            int offset, int length) {
        return charset.decode(ByteBuffer.wrap(buffer, offset, length))
                .toString();
    }
}

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