Java Convert via ByteBuffer toDirectBuffer(String s)

Description

to Direct Buffer

License

Open Source License

Declaration

public static ByteBuffer toDirectBuffer(String s) 

Method Source Code

//package com.java2s;
//  are made available under the terms of the Eclipse Public License v1.0

import java.nio.ByteBuffer;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;

public class Main {
    public static final ByteBuffer EMPTY_BUFFER = ByteBuffer.wrap(new byte[0]);

    public static ByteBuffer toDirectBuffer(String s) {
        return toDirectBuffer(s, StandardCharsets.ISO_8859_1);
    }/*from  ww w  .  ja va 2 s  .  co  m*/

    public static ByteBuffer toDirectBuffer(String s, Charset charset) {
        if (s == null)
            return EMPTY_BUFFER;
        byte[] bytes = s.getBytes(charset);
        ByteBuffer buf = ByteBuffer.allocateDirect(bytes.length);
        buf.put(bytes);
        buf.flip();
        return buf;
    }

    /** Allocate ByteBuffer in flush mode.
     * The position and limit will both be zero, indicating that the buffer is
     * empty and in flush mode.
     * @param capacity capacity of the allocated ByteBuffer
     * @return Buffer
     */
    public static ByteBuffer allocateDirect(int capacity) {
        ByteBuffer buf = ByteBuffer.allocateDirect(capacity);
        buf.limit(0);
        return buf;
    }

    /**
     * Put data from one buffer into another, avoiding over/under flows
     * @param from Buffer to take bytes from in flush mode
     * @param to   Buffer to put bytes to in fill mode.
     * @return number of bytes moved
     */
    public static int put(ByteBuffer from, ByteBuffer to) {
        int put;
        int remaining = from.remaining();
        if (remaining > 0) {
            if (remaining <= to.remaining()) {
                to.put(from);
                put = remaining;
                from.position(from.limit());
            } else if (from.hasArray()) {
                put = to.remaining();
                to.put(from.array(), from.arrayOffset() + from.position(), put);
                from.position(from.position() + put);
            } else {
                put = to.remaining();
                ByteBuffer slice = from.slice();
                slice.limit(put);
                to.put(slice);
                from.position(from.position() + put);
            }
        } else
            put = 0;

        return put;
    }
}

Related

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2. toBytesAsString(UUID uuid)
3. toChars(byte[] bytes)
4. toChars(byte[] bytes)
5. toChars(byte[] bytes)
6. toDoubleArray(byte[] data)
7. toFile(URL url)
8. toFile(URL url)
9. toFiles(URL[] urls)