java.nio.Buffer.capacity()方法的使用及代码示例

x33g5p2x  于2022-01-16 转载在 其他  
字(9.8k)|赞(0)|评价(0)|浏览(199)

本文整理了Java中java.nio.Buffer.capacity()方法的一些代码示例，展示了Buffer.capacity()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Buffer.capacity()方法的具体详情如下：
包路径：java.nio.Buffer
类名称：Buffer
方法名：capacity

Buffer.capacity介绍

[英]The capacity of this buffer, which never change.
[中]此缓冲区的容量永远不会改变。

代码示例

代码示例来源：origin: google/guava

/** Returns the number of elements between the limit and capacity. */
private static int availableCapacity(Buffer buffer) {
 return buffer.capacity() - buffer.limit();
}

代码示例来源：origin: prestodb/presto

/** Returns the number of elements between the limit and capacity. */
private static int availableCapacity(Buffer buffer) {
 return buffer.capacity() - buffer.limit();
}

代码示例来源：origin: google/j2objc

/** Returns the number of elements between the limit and capacity. */
private static int availableCapacity(Buffer buffer) {
 return buffer.capacity() - buffer.limit();
}

代码示例来源：origin: wildfly/wildfly

/** Returns the number of elements between the limit and capacity. */
private static int availableCapacity(Buffer buffer) {
 return buffer.capacity() - buffer.limit();
}

代码示例来源：origin: Rajawali/Rajawali

/**
 * Change a specific subset of the buffer's data at the given offset to the given length.
 *
 * @param bufferInfo
 * @param newData
 * @param index
 * @param resizeBuffer
 */
public void changeBufferData(BufferInfo bufferInfo, Buffer newData, int index, boolean resizeBuffer) {
  changeBufferData(bufferInfo, newData, index, newData.capacity(), resizeBuffer);
}

代码示例来源：origin: stackoverflow.com

// Create an empty ByteBuffer with a 10 byte capacity
 ByteBuffer bbuf = ByteBuffer.allocate(10);
 // Get the buffer's capacity
 int capacity = bbuf.capacity(); // 10
 // Use the absolute put(int, byte).
 // This method does not affect the position.
 bbuf.put(0, (byte)0xFF); // position=0
 // Set the position
 bbuf.position(5);
 // Use the relative put(byte)
 bbuf.put((byte)0xFF);
 // Get the new position
 int pos = bbuf.position(); // 6
 // Get remaining byte count
 int rem = bbuf.remaining(); // 4
 // Set the limit
 bbuf.limit(7); // remaining=1
 // This convenience method sets the position to 0
 bbuf.rewind(); // remaining=7

代码示例来源：origin: jMonkeyEngine/jmonkeyengine

&& buffer.limit() == buffer.capacity()) {
  sb.append(buffer.capacity());
} else {
  sb.append("pos=").append(buffer.position());
  sb.append(" lim=").append(buffer.limit());
  sb.append(" cap=").append(buffer.capacity());

代码示例来源：origin: stackoverflow.com

public static void main(String... args) {
  ByteBuffer bb1 = ByteBuffer.allocateDirect(256 * 1024).order(ByteOrder.nativeOrder());
  ByteBuffer bb2 = ByteBuffer.allocateDirect(256 * 1024).order(ByteOrder.nativeOrder());
  for (int i = 0; i < 10; i++)
    runTest(bb1, bb2);
}

private static void runTest(ByteBuffer bb1, ByteBuffer bb2) {
  Unsafe unsafe = getTheUnsafe();
  long start = System.nanoTime();
  long addr1 = ((DirectBuffer) bb1).address();
  long addr2 = ((DirectBuffer) bb2).address();
  for (int i = 0, len = Math.min(bb1.capacity(), bb2.capacity()); i < len; i += 4)
    unsafe.putInt(addr1 + i, unsafe.getInt(addr2 + i));
  long time = System.nanoTime() - start;
  int operations = bb1.capacity() / 4 * 2;
  System.out.printf("Each putInt/getInt took an average of %.1f ns%n", (double) time / operations);
}

public static Unsafe getTheUnsafe() {
  try {
    Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe");
    theUnsafe.setAccessible(true);
    return (Unsafe) theUnsafe.get(null);
  } catch (Exception e) {
    throw new AssertionError(e);
  }
}

代码示例来源：origin: Rajawali/Rajawali

public String toString() {
  final StringBuilder buff = new StringBuilder();
  if (mBuffers.get(INDEX_BUFFER_KEY).buffer != null) {
    buff.append("Geometry3D indices: ").append(mBuffers.get(INDEX_BUFFER_KEY).buffer.capacity());
    buff.append(", vertices: ").append(mBuffers.get(VERTEX_BUFFER_KEY).buffer.capacity());
    buff.append(", normals: ").append(mBuffers.get(NORMAL_BUFFER_KEY).buffer.capacity());
    buff.append(", uvs: ").append(mBuffers.get(TEXTURE_BUFFER_KEY).buffer.capacity()).append("\n");
    buff.append(", colors: ").append(mBuffers.get(COLOR_BUFFER_KEY).buffer.capacity()).append("\n");

代码示例来源：origin: stackoverflow.com

public static ByteBuffer clone(ByteBuffer original) {
    ByteBuffer clone = ByteBuffer.allocate(original.capacity());
    original.rewind();//copy from the beginning
    clone.put(original);
    original.rewind();
    clone.flip();
    return clone;
}

代码示例来源：origin: stackoverflow.com

public static void main(String... args) {
  ByteBuffer bb1 = ByteBuffer.allocateDirect(256 * 1024).order(ByteOrder.nativeOrder());
  ByteBuffer bb2 = ByteBuffer.allocateDirect(256 * 1024).order(ByteOrder.nativeOrder());
  for (int i = 0; i < 10; i++)
    runTest(bb1, bb2);
}

private static void runTest(ByteBuffer bb1, ByteBuffer bb2) {
  bb1.clear();
  bb2.clear();
  long start = System.nanoTime();
  int count = 0;
  while (bb2.remaining() > 0)
    bb2.putInt(bb1.getInt());
  long time = System.nanoTime() - start;
  int operations = bb1.capacity() / 4 * 2;
  System.out.printf("Each putInt/getInt took an average of %.1f ns%n", (double) time / operations);
}

代码示例来源：origin: bytedeco/javacpp

/**
 * Copies the address, position, limit, and capacity of a direct NIO {@link Buffer}.
 * Also keeps a reference to it to prevent its memory from getting deallocated.
 *
 * @param b the Buffer object to reference
 */
public Pointer(final Buffer b) {
  if (b != null) {
    allocate(b);
  }
  if (!isNull()) {
    address -= b.position() * sizeof();
    position = b.position();
    limit = b.limit();
    capacity = b.capacity();
    deallocator = new Deallocator() { Buffer bb = b; public void deallocate() { bb = null; } };
  }
}
private native void allocate(Buffer b);

代码示例来源：origin: jMonkeyEngine/jmonkeyengine

private static void onBufferAllocated(Buffer buffer) {
  if (BufferUtils.trackDirectMemory) {
    if (BufferUtils.cleanupthread == null) {
      BufferUtils.cleanupthread = new ClearReferences();
      BufferUtils.cleanupthread.start();
    }
    if (buffer instanceof ByteBuffer) {
      BufferInfo info = new BufferInfo(ByteBuffer.class, buffer.capacity(), buffer,
          BufferUtils.removeCollected);
      BufferUtils.trackedBuffers.put(info, info);
    } else if (buffer instanceof FloatBuffer) {
      BufferInfo info = new BufferInfo(FloatBuffer.class, buffer.capacity() * 4, buffer,
          BufferUtils.removeCollected);
      BufferUtils.trackedBuffers.put(info, info);
    } else if (buffer instanceof IntBuffer) {
      BufferInfo info = new BufferInfo(IntBuffer.class, buffer.capacity() * 4, buffer,
          BufferUtils.removeCollected);
      BufferUtils.trackedBuffers.put(info, info);
    } else if (buffer instanceof ShortBuffer) {
      BufferInfo info = new BufferInfo(ShortBuffer.class, buffer.capacity() * 2, buffer,
          BufferUtils.removeCollected);
      BufferUtils.trackedBuffers.put(info, info);
    } else if (buffer instanceof DoubleBuffer) {
      BufferInfo info = new BufferInfo(DoubleBuffer.class, buffer.capacity() * 8, buffer,
          BufferUtils.removeCollected);
      BufferUtils.trackedBuffers.put(info, info);
    }
  }
}

代码示例来源：origin: robovm/robovm

public AudioValueTranslation setInputData(Buffer data) {
  setInputDataSize(data.capacity());
  setInputData0(BufferMarshaler.toNative(data, 0));
  return this;
}
private AudioValueTranslation setInputArrayData(Object array, int length) {

代码示例来源：origin: robovm/robovm

public AudioBuffer setData(Buffer data) {
  setDataByteSize(data.capacity());
  setData0(BufferMarshalers.BufferMarshaler.toNative(data, 0));
  return this;
}
private AudioBuffer setArrayData(Object array, int length) {

代码示例来源：origin: robovm/robovm

public AudioQueueBuffer setAudioData(Buffer data) {
  setAudioDataByteSize(data.capacity());
  setData0(BufferMarshalers.BufferMarshaler.toNative(data, 0));
  return this;
}
private AudioQueueBuffer setArrayAudioData(Object array, int length) {

代码示例来源：origin: Rajawali/Rajawali

public static int[] getIntArrayFromBuffer(Buffer buffer) {
  int[] array = new int[0];
  if (buffer != null) {
    if (buffer.hasArray()) {
      array = (int[]) buffer.array();
    } else {
      buffer.rewind();
      array = new int[buffer.capacity()];
      if (buffer instanceof IntBuffer) {
        ((IntBuffer) buffer).get(array);
      } else if (buffer instanceof ShortBuffer) {
        int count = 0;
        while (buffer.hasRemaining()) {
          array[count] = (int) (((ShortBuffer) buffer).get());
          ++count;
        }
      }
    }
  }
  return array;
}

代码示例来源：origin: Rajawali/Rajawali

/**
   * Creates an int array from the provided {@link IntBuffer} or {@link ShortBuffer}.
   * 
   * @param buffer {@link Buffer} the data source. Should be either a {@link IntBuffer} 
   * or {@link ShortBuffer}.
   * @return int array containing the data of the buffer.
   */
  public static int[] getIntArrayFromBuffer(Buffer buffer) {
    int[] array = null;
    if (buffer.hasArray()) {
      array = (int[]) buffer.array();
    } else {
      buffer.rewind();
      array = new int[buffer.capacity()];
      if (buffer instanceof IntBuffer) {
        ((IntBuffer) buffer).get(array);
      } else if (buffer instanceof ShortBuffer) {
        int count = 0;
        while (buffer.hasRemaining()) {
          array[count] = (int) (((ShortBuffer) buffer).get());
          ++count;
        }
      }
    }
    return array;
  }
}

代码示例来源：origin: Rajawali/Rajawali

buffer.rewind();
GLES20.glBindBuffer(target, handle);
GLES20.glBufferData(target, buffer.capacity() * byteSize, buffer, usage);
GLES20.glBindBuffer(target, 0);

代码示例来源：origin: google/guava

public void testGet_io() throws IOException {
 assertEquals(-1, ArbitraryInstances.get(InputStream.class).read());
 assertEquals(-1, ArbitraryInstances.get(ByteArrayInputStream.class).read());
 assertEquals(-1, ArbitraryInstances.get(Readable.class).read(CharBuffer.allocate(1)));
 assertEquals(-1, ArbitraryInstances.get(Reader.class).read());
 assertEquals(-1, ArbitraryInstances.get(StringReader.class).read());
 assertEquals(0, ArbitraryInstances.get(Buffer.class).capacity());
 assertEquals(0, ArbitraryInstances.get(CharBuffer.class).capacity());
 assertEquals(0, ArbitraryInstances.get(ByteBuffer.class).capacity());
 assertEquals(0, ArbitraryInstances.get(ShortBuffer.class).capacity());
 assertEquals(0, ArbitraryInstances.get(IntBuffer.class).capacity());
 assertEquals(0, ArbitraryInstances.get(LongBuffer.class).capacity());
 assertEquals(0, ArbitraryInstances.get(FloatBuffer.class).capacity());
 assertEquals(0, ArbitraryInstances.get(DoubleBuffer.class).capacity());
 ArbitraryInstances.get(PrintStream.class).println("test");
 ArbitraryInstances.get(PrintWriter.class).println("test");
 assertNotNull(ArbitraryInstances.get(File.class));
 assertFreshInstanceReturned(
   ByteArrayOutputStream.class, OutputStream.class,
   Writer.class, StringWriter.class,
   PrintStream.class, PrintWriter.class);
 assertEquals(ByteSource.empty(), ArbitraryInstances.get(ByteSource.class));
 assertEquals(CharSource.empty(), ArbitraryInstances.get(CharSource.class));
 assertNotNull(ArbitraryInstances.get(ByteSink.class));
 assertNotNull(ArbitraryInstances.get(CharSink.class));
}

内容来源于网络，如有侵权，请联系作者删除！

Buffer

相关文章

    查看更多
    微信公众号

    热门标签

    更多
    JavaquerypythonNode开发语言requestUtil数据库Table后端算法LoggerMessageElementParser

    最新文章

    更多
    • 蜀ICP备13028337号-1 大数据知识库 https://www.saoniuhuo.com © All rights reserved
    • 本站内容来源互联网,如果侵犯您的权益请联系我们删除, 联系方式：448109455@qq.com