Java String Encode by Charset encode(Charset charset, String string)

Here you can find the source of encode(Charset charset, String string)

Description

encode

License

Open Source License

Declaration

public static byte[] encode(Charset charset, String string) 

Method Source Code


//package com.java2s;
/*/*  w  w w.j av  a 2s.  c o m*/
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import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;

public class Main {
    public static byte[] encode(Charset charset, String string) {
        CharsetEncoder ce = charset.newEncoder();
        int en = scale(string.length(), ce.maxBytesPerChar());
        byte[] ba = new byte[en];
        if (string.length() == 0)
            return ba;

        ce.reset();
        ByteBuffer bb = ByteBuffer.wrap(ba);
        CharBuffer cb = CharBuffer.wrap(string);
        try {
            CoderResult cr = ce.encode(cb, bb, true);
            if (!cr.isUnderflow())
                cr.throwException();
            cr = ce.flush(bb);
            if (!cr.isUnderflow())
                cr.throwException();
        } catch (CharacterCodingException x) {
            // Substitution is always enabled,
            // so this shouldn't happen
            throw new Error(x);
        }
        return safeTrim(ba, bb.position());
    }

    private static int scale(int len, float expansionFactor) {
        // We need to perform double, not float, arithmetic; otherwise
        // we lose low order bits when len is larger than 2**24.
        return (int) (len * (double) expansionFactor);
    }

    private static byte[] safeTrim(byte[] ba, int len) {
        if (len == ba.length && (System.getSecurityManager() == null)) {
            return ba;
        } else {
            return copyOf(ba, len);
        }
    }

    private static byte[] copyOf(byte[] original, int newLength) {
        byte[] copy = new byte[newLength];
        System.arraycopy(original, 0, copy, 0, Math.min(original.length, newLength));
        return copy;
    }
}

Related

  1. canEncode(String charset, CharSequence text, String unicodeValue)
  2. canEncode(String sz, String charset)
  3. charsetForNameOrDefault(String encoding)
  4. checkEncoder(CharsetEncoder encoder)
  5. deflate(int level, String str, Charset encoding)
  6. encode(final String str, final Charset charset)
  7. encode(String charsetName, char[] chars, int offset, int length)
  8. encode(String s, Charset encoding)
  9. encode(String text, Charset charset)