本文整理汇总了Java中java.util.NavigableSet.pollLast方法的典型用法代码示例。如果您正苦于以下问题：Java NavigableSet.pollLast方法的具体用法？Java NavigableSet.pollLast怎么用？Java NavigableSet.pollLast使用的例子？那么恭喜您, 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java.util.NavigableSet的用法示例。
在下文中一共展示了NavigableSet.pollLast方法的1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: getMedian
import java.util.NavigableSet; //导入方法依赖的package包/类
/**
* Gives a List containing sum of values and sum of weights.
* It is computed for the combination of column
* family and column qualifier(s) in the given row range as defined in the
* Scan object. In its current implementation, it takes one column family and
* two column qualifiers. The first qualifier is for values column and
* the second qualifier (optional) is for weight column.
*/
@Override
public void getMedian(RpcController controller, AggregateRequest request,
RpcCallback<AggregateResponse> done) {
AggregateResponse response = null;
InternalScanner scanner = null;
try {
ColumnInterpreter<T, S, P, Q, R> ci = constructColumnInterpreterFromRequest(request);
S sumVal = null, sumWeights = null, tempVal = null, tempWeight = null;
Scan scan = ProtobufUtil.toScan(request.getScan());
scanner = env.getRegion().getScanner(scan);
byte[] colFamily = scan.getFamilies()[0];
NavigableSet<byte[]> qualifiers = scan.getFamilyMap().get(colFamily);
byte[] valQualifier = null, weightQualifier = null;
if (qualifiers != null && !qualifiers.isEmpty()) {
valQualifier = qualifiers.pollFirst();
// if weighted median is requested, get qualifier for the weight column
weightQualifier = qualifiers.pollLast();
}
List<Cell> results = new ArrayList<Cell>();
boolean hasMoreRows = false;
do {
tempVal = null;
tempWeight = null;
hasMoreRows = scanner.next(results);
int listSize = results.size();
for (int i = 0; i < listSize; i++) {
Cell kv = results.get(i);
tempVal = ci.add(tempVal, ci.castToReturnType(ci.getValue(colFamily,
valQualifier, kv)));
if (weightQualifier != null) {
tempWeight = ci.add(tempWeight,
ci.castToReturnType(ci.getValue(colFamily, weightQualifier, kv)));
}
}
results.clear();
sumVal = ci.add(sumVal, tempVal);
sumWeights = ci.add(sumWeights, tempWeight);
} while (hasMoreRows);
ByteString first_sumVal = ci.getProtoForPromotedType(sumVal).toByteString();
S s = sumWeights == null ? ci.castToReturnType(ci.getMinValue()) : sumWeights;
ByteString first_sumWeights = ci.getProtoForPromotedType(s).toByteString();
AggregateResponse.Builder pair = AggregateResponse.newBuilder();
pair.addFirstPart(first_sumVal);
pair.addFirstPart(first_sumWeights);
response = pair.build();
} catch (IOException e) {
ResponseConverter.setControllerException(controller, e);
} finally {
if (scanner != null) {
try {
scanner.close();
} catch (IOException ignored) {}
}
}
done.run(response);
}