org.jgroups.util.ByteBufferOutputStream Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of wildfly-client-all

This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

There is a newer version: 34.0.0.Final

Show newest version

package org.jgroups.util;

import java.io.DataOutput;
import java.io.IOException;
import java.io.UTFDataFormatException;
import java.nio.ByteBuffer;

/**
 * Class using {@link ByteBuffer} and implementing {@link DataOutput}. Note that all instances need to pass the
 * exact size of the marshalled object as a ByteBuffer cannot be expanded.
 * @author Bela Ban
 * @since  3.5
 */
public class ByteBufferOutputStream implements DataOutput {
    protected final ByteBuffer buf;


    public ByteBufferOutputStream(ByteBuffer buf) {
        this.buf=buf;
    }

    public void reset() {buf.clear();}

    public ByteBuffer getBuffer() {return buf;}

    public ByteArray getBufferAsBuffer() {
        return new ByteArray(buf.array(), buf.arrayOffset(), buf.position());
    }


    public void write(int b) throws IOException {
        buf.put((byte)b);
    }

    public void write(byte[] b) throws IOException {
        write(b,0,b.length);
    }

    public void write(byte[] b, int off, int len) throws IOException {
        buf.put(b, off, len);
    }

    public void writeBoolean(boolean v) throws IOException {
        write(v? 1 : 0);
    }

    public void writeByte(int v) throws IOException {
        write(v);
    }

    public void writeShort(int v) throws IOException {
        buf.putShort((short)v);
    }

    public void writeChar(int v) throws IOException {
        buf.putChar((char)v);
    }

    public void writeInt(int v) throws IOException {
        buf.putInt(v);
    }

    public void writeLong(long v) throws IOException {
        buf.putLong(v);
    }

    public void writeFloat(float v) throws IOException {
        buf.putFloat(v);
    }

    public void writeDouble(double v) throws IOException {
        buf.putDouble(v);
    }

    public void writeBytes(String s) throws IOException {
        int len=s.length();
        for(int i = 0 ; i < len ; i++)
            write((byte)s.charAt(i));
    }

    public void writeChars(String s) throws IOException {
        int len=s.length();
        for (int i = 0 ; i < len ; i++) {
            int v = s.charAt(i);
            write((v >>> 8) & 0xFF);
            write((v >>> 0) & 0xFF);
        }
    }

    public void writeUTF(String str) throws IOException {
        int strlen = str.length();
        int utflen = 0;
        int c, count = 0;

        /* use charAt instead of copying String to char array */
        for (int i = 0; i < strlen; i++) {
            c = str.charAt(i);
            if ((c >= 0x0001) && (c <= 0x007F)) {
                utflen++;
            } else if (c > 0x07FF) {
                utflen += 3;
            } else {
                utflen += 2;
            }
        }

        if (utflen > 65535)
            throw new UTFDataFormatException("encoded string too long: " + utflen + " bytes");

        writeShort(utflen);

        byte[] bytearr=new byte[utflen];

        int i=0;
        for (i=0; i= 0x0001) && (c <= 0x007F))) break;
            bytearr[count++] = (byte) c;
        }

        for (;i < strlen; i++){
            c = str.charAt(i);
            if ((c >= 0x0001) && (c <= 0x007F)) {
                bytearr[count++] = (byte) c;

            } else if (c > 0x07FF) {
                bytearr[count++] = (byte) (0xE0 | ((c >> 12) & 0x0F));
                bytearr[count++] = (byte) (0x80 | ((c >>  6) & 0x3F));
                bytearr[count++] = (byte) (0x80 | ((c >>  0) & 0x3F));
            } else {
                bytearr[count++] = (byte) (0xC0 | ((c >>  6) & 0x1F));
                bytearr[count++] = (byte) (0x80 | ((c >>  0) & 0x3F));
            }
        }
        write(bytearr,0,utflen);
    }

    public String toString() {
        return buf.toString();
    }
}