本文整理汇总了Java中org.apache.hadoop.io.WritableUtils.isNegativeVInt方法的典型用法代码示例。如果您正苦于以下问题：Java WritableUtils.isNegativeVInt方法的具体用法？Java WritableUtils.isNegativeVInt怎么用？Java WritableUtils.isNegativeVInt使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类org.apache.hadoop.io.WritableUtils的用法示例。
在下文中一共展示了WritableUtils.isNegativeVInt方法的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: _readMvccVersion
import org.apache.hadoop.io.WritableUtils; //导入方法依赖的package包/类
/**
* Actually do the mvcc read. Does no checks.
* @param position
*/
private void _readMvccVersion(final int position) {
// This is Bytes#bytesToVint inlined so can save a few instructions in this hot method; i.e.
// previous if one-byte vint, we'd redo the vint call to find int size.
// Also the method is kept small so can be inlined.
byte firstByte = blockBuffer.array()[position];
int len = WritableUtils.decodeVIntSize(firstByte);
if (len == 1) {
this.currMemstoreTS = firstByte;
} else {
long i = 0;
for (int idx = 0; idx < len - 1; idx++) {
byte b = blockBuffer.array()[position + 1 + idx];
i = i << 8;
i = i | (b & 0xFF);
}
currMemstoreTS = (WritableUtils.isNegativeVInt(firstByte) ? ~i : i);
}
this.currMemstoreTSLen = len;
}
示例2: bytesToVint
import org.apache.hadoop.io.WritableUtils; //导入方法依赖的package包/类
/**
* @param buffer buffer to convert
* @return vint bytes as an integer.
*/
public static long bytesToVint(final byte [] buffer) {
int offset = 0;
byte firstByte = buffer[offset++];
int len = WritableUtils.decodeVIntSize(firstByte);
if (len == 1) {
return firstByte;
}
long i = 0;
for (int idx = 0; idx < len-1; idx++) {
byte b = buffer[offset++];
i = i << 8;
i = i | (b & 0xFF);
}
return (WritableUtils.isNegativeVInt(firstByte) ? ~i : i);
}
示例3: readVLong
import org.apache.hadoop.io.WritableUtils; //导入方法依赖的package包/类
/**
* Similar to {@link WritableUtils#readVLong(DataInput)} but reads from a
* {@link ByteBuffer}.
*/
public static long readVLong(ByteBuffer in) {
byte firstByte = in.get();
int len = WritableUtils.decodeVIntSize(firstByte);
if (len == 1) {
return firstByte;
}
long i = 0;
for (int idx = 0; idx < len-1; idx++) {
byte b = in.get();
i = i << 8;
i = i | (b & 0xFF);
}
return (WritableUtils.isNegativeVInt(firstByte) ? (i ^ -1L) : i);
}
示例4: readAsVLong
import org.apache.hadoop.io.WritableUtils; //导入方法依赖的package包/类
/**
* Reads a zero-compressed encoded long from input buffer and returns it.
* @param buffer Binary array
* @param offset Offset into array at which vint begins.
* @return deserialized long from buffer.
*/
public static long readAsVLong(final byte [] buffer, final int offset) {
byte firstByte = buffer[offset];
int len = WritableUtils.decodeVIntSize(firstByte);
if (len == 1) {
return firstByte;
}
long i = 0;
for (int idx = 0; idx < len-1; idx++) {
byte b = buffer[offset + 1 + idx];
i = i << 8;
i = i | (b & 0xFF);
}
return (WritableUtils.isNegativeVInt(firstByte) ? ~i : i);
}