Examples of java.nio.Buffer

java.nio.Buffer
A buffer is a list of elements of a specific primitive type.
A buffer can be described by following properties:
- Capacity, is the number of elements a buffer can hold. Capacity is no less than zero and never changes.
- Posotion, is a cursor of this buffer. Elements are read or write at the position if you do not specify an index explicitly. Position is no less than zero and no greater than the limit.
- Limit controls the scope of accessible elements. You can only read or write elements from index zero to limit - 1. Accessing elements out of the scope will cause exception. Limit is no less than zero and no greater than capacity.
- Mark, is used to remember the current position, so that you can reset the position later. Mark is no less than zero and no greater than position.
- A buffer can be readonly or read-write. Trying to modify the elements of a readonly buffer will cause ReadOnlyBufferException, while changing the position, limit and mark of a readonly buffer is OK.
- A buffer can be direct or indirect. A direct buffer will try its best to take advantage of native memory APIs and it may not stay in java heap, thus not affected by GC.
Buffers are not thread-safe. If concurrent access to a buffer instance is required, then the callers are responsible to take care of the synchronization issues.

        final GL gl = GLContext.getCurrentGL();


        int vboID = data.getVBOID(context.getGlContextRep());
        if (vboID != 0) {
            if (data.isNeedsRefresh()) {
                final Buffer dataBuffer = data.getBuffer();
                dataBuffer.rewind();
                JoglRendererUtil.setBoundElementVBO(rendRecord, vboID);
                gl.glBufferSubData(GL.GL_ELEMENT_ARRAY_BUFFER, 0, dataBuffer.limit() * data.getByteCount(), dataBuffer);
                data.setNeedsRefresh(false);
            }


            return vboID;
        }


        final Buffer dataBuffer = data.getBuffer();
        if (dataBuffer != null) {
            // XXX: should we be rewinding? Maybe make that the programmer's responsibility.
            dataBuffer.rewind();
            vboID = makeVBOId();
            data.setVBOID(context.getGlContextRep(), vboID);


            rendRecord.invalidateVBO();
            JoglRendererUtil.setBoundElementVBO(rendRecord, vboID);
            gl.glBufferData(GL.GL_ELEMENT_ARRAY_BUFFER, dataBuffer.limit() * data.getByteCount(), dataBuffer,
                    getGLVBOAccessMode(data.getVboAccessMode()));
        } else {
            throw new Ardor3dException("Attempting to create a vbo id for a IndexBufferData with no Buffer value.");
        }
        return vboID;

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            ByteBuffer anotherNIO = newDirectByteBuffer(2);


            for (CLMemory<? extends Buffer> memory : buffers) {


                CLBuffer<? extends Buffer> buffer = (CLBuffer<? extends Buffer>) memory;
                Buffer nio = buffer.getBuffer();


                assertEquals(nio.capacity(), buffer.getCLCapacity());
                assertEquals(buffer.getNIOSize(), buffer.getCLSize());
                assertEquals(sizeOfBufferElem(nio), buffer.getElementSize());
                assertEquals(nio.capacity() * sizeOfBufferElem(nio), buffer.getCLSize());
                
                CLBuffer<ByteBuffer> clone = buffer.cloneWith(anotherNIO);


                assertEquals(buffer.ID, clone.ID);
                assertTrue(clone.equals(buffer));

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    public void testClear() {
        // save state
        int oldPosition = baseBuf.position();
        int oldLimit = baseBuf.limit();


        Buffer ret = baseBuf.clear();
        assertSame(ret, baseBuf);
        assertEquals(baseBuf.position(), 0);
        assertEquals(baseBuf.limit(), baseBuf.capacity());
        try {
            baseBuf.reset();

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    public void testFlip() {
        // save state
        int oldPosition = baseBuf.position();
        int oldLimit = baseBuf.limit();


        Buffer ret = baseBuf.flip();
        assertSame(ret, baseBuf);
        assertEquals(baseBuf.position(), 0);
        assertEquals(baseBuf.limit(), oldPosition);
        try {
            baseBuf.reset();

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    public void testLimitint() {
        // save state
        int oldPosition = baseBuf.position();
        int oldLimit = baseBuf.limit();


        Buffer ret = baseBuf.limit(baseBuf.limit());
        assertSame(ret, baseBuf);


        baseBuf.mark();
        baseBuf.limit(baseBuf.capacity());
        assertEquals(baseBuf.limit(), baseBuf.capacity());

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    public void testMark() {
        // save state
        int oldPosition = baseBuf.position();
        int oldLimit = baseBuf.limit();


        Buffer ret = baseBuf.mark();
        assertSame(ret, baseBuf);


        baseBuf.mark();
        baseBuf.position(baseBuf.limit());
        baseBuf.reset();

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            } catch (InvalidMarkException e) {
                // expected
            }
        }


        Buffer ret = baseBuf.position(0);
        assertSame(ret, baseBuf);


        // restore state
        baseBuf.limit(oldLimit);
        baseBuf.position(oldPosition);

View Full Code Here

        baseBuf.mark();
        baseBuf.position(baseBuf.limit());
        baseBuf.reset();
        assertEquals(baseBuf.position(), oldPosition);


        Buffer ret = baseBuf.reset();
        assertSame(ret, baseBuf);


        baseBuf.clear();
        try {
            baseBuf.reset();

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    public void testRewind() {
        // save state
        int oldPosition = baseBuf.position();
        int oldLimit = baseBuf.limit();


        Buffer ret = baseBuf.rewind();
        assertEquals(baseBuf.position(), 0);
        assertSame(ret, baseBuf);
        try {
            baseBuf.reset();
            fail("Should throw Exception"); //$NON-NLS-1$

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    public static void testClear(Buffer buf) {
        // save state
        int oldPosition = buf.position();
        int oldLimit = buf.limit();


        Buffer ret = buf.clear();
        assertSame(ret, buf);
        assertEquals(buf.position(), 0);
        assertEquals(buf.limit(), buf.capacity());
        try {
            buf.reset();

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