public static XYSeries getXY(String url) {
XYSeries xyseries = new XYSeries("");
Path path = new Path(url);
Configuration conf = HUtils.getConf();
SequenceFile.Reader reader = null;
try {
reader =
new SequenceFile.Reader(
conf, Reader.file(path), Reader.bufferSize(4096), Reader.start(0));
DoubleArrStrWritable dkey =
(DoubleArrStrWritable) ReflectionUtils.newInstance(reader.getKeyClass(), conf);
DoublePairWritable dvalue =
(DoublePairWritable) ReflectionUtils.newInstance(reader.getValueClass(), conf);
while (reader.next(dkey, dvalue)) { // 循环读取文件
xyseries.add(dvalue.getFirst(), dvalue.getSecond());
}
} catch (Exception e) {
e.printStackTrace();
} finally {
IOUtils.closeStream(reader);
}
return xyseries;
}
/**
* return the x*y
*
* @param url
* @return
*/
public Double[] getR(String url) {
List<Double> list = new ArrayList<Double>();
Path path = new Path(url);
Configuration conf = HUtils.getConf();
SequenceFile.Reader reader = null;
try {
reader =
new SequenceFile.Reader(
conf, Reader.file(path), Reader.bufferSize(4096), Reader.start(0));
DoubleArrStrWritable dkey =
(DoubleArrStrWritable) ReflectionUtils.newInstance(reader.getKeyClass(), conf);
DoublePairWritable dvalue =
(DoublePairWritable) ReflectionUtils.newInstance(reader.getValueClass(), conf);
while (reader.next(dkey, dvalue)) { // 循环读取文件
// list.add(dvalue.getSum()*dvalue.getDistance());
}
} catch (Exception e) {
e.printStackTrace();
} finally {
IOUtils.closeStream(reader);
}
Double[] dList = new Double[list.size()];
dList = list.toArray(dList);
Arrays.sort(dList);
return dList;
}
private static List<IDistanceDensityMul> getIDistanceDensityMulList(String url)
throws FileNotFoundException, IOException {
Configuration conf = HUtils.getConf();
SequenceFile.Reader reader = null;
// 多个文件整合，需排序
List<IDistanceDensityMul> allList = new ArrayList<IDistanceDensityMul>();
// 单个文件
List<IDistanceDensityMul> fileList = new ArrayList<IDistanceDensityMul>();
FileStatus[] fss =
HUtils.getHDFSPath(url, "true")
.getFileSystem(conf)
.listStatus(HUtils.getHDFSPath(url, "true"));
for (FileStatus f : fss) {
if (!f.toString().contains("part")) {
continue; // 排除其他文件
}
try {
reader =
new SequenceFile.Reader(
conf, Reader.file(f.getPath()), Reader.bufferSize(4096), Reader.start(0));
// <density_i*min_distancd_j> <first:density_i,second:min_distance_j,third:i>
// DoubleWritable, IntDoublePairWritable
CustomDoubleWritable dkey =
(CustomDoubleWritable) ReflectionUtils.newInstance(reader.getKeyClass(), conf);
IntDoublePairWritable dvalue =
(IntDoublePairWritable) ReflectionUtils.newInstance(reader.getValueClass(), conf);
int i = Utils.GETDRAWPICRECORDS_EVERYFILE;
while (reader.next(dkey, dvalue) && i > 0) { // 循环读取文件
i--;
fileList.add(
new IDistanceDensityMul(
dvalue.getSecond(),
dvalue.getFirst(),
dvalue.getThird(),
dkey.get())); // 每个文件都是从小到大排序的
}
} catch (Exception e) {
e.printStackTrace();
} finally {
IOUtils.closeStream(reader);
}
// 整合当前文件的前面若干条记录（Utils.GETDRAWPICRECORDS_EVERYFILE ）
if (allList.size() <= 0) { // 第一次可以全部添加
allList.addAll(fileList);
} else {
combineLists(allList, fileList);
}
} // for
// 第一个点太大了，选择去掉
return allList.subList(1, allList.size());
}