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Statistical sampling library for use in virtdata libraries, based on apache commons math 4

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package io.nosqlbench.virtdata.annotations;

import java.util.Arrays;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 

Formatting conventions

* The following example formats are supported: * *
    *
  • CtorName(param,...)
    - as the constructor would be called.
  • *
  • [1,2,3]
    - a sequence of integer values
  • *
  • [longs1]
    - a name of a pre-defined set of sample inputs
  • *
*/ public class ExampleData { public static Pattern CTOR_PATTERN = Pattern.compile("(?[^)]+)\\((?.+)\\)"); public static Pattern VALS_PATTERN = Pattern.compile("\\[(?-?\\d+([,-. ]+-?\\d+)*)]"); private Pattern COMMA_VALS = Pattern.compile("\\[(?-?\\d+(,-?\\d+)*)]"); private Pattern RANGE_VALS = Pattern.compile("\\[(?-?\\d+)\\.\\.(?-?\\d+)( +(?-?\\d+))?]"); public String[] parts; public ExampleData(String[] parts) { this.parts = parts; } public static void validateExamples(List> examples) { for (List example : examples) { for (String examplePart : example) { if (CTOR_PATTERN.matcher(examplePart).matches()) { continue; } if (VALS_PATTERN.matcher(examplePart).matches()) { continue; } if (!examplePart.startsWith("[")) { return; } throw new RuntimeException("Unable to match a valid pattern for example fragment '"+examplePart +"')" + ". See javadoc for the Example annotation for details."); } } } public long[] getLongInputs() { long[] vals = new long[0]; for (String part : parts) { if (VALS_PATTERN.matcher(part).matches()) { String[] specs = part.split(";"); long[][] genvals = new long[specs.length][]; int len =0; for (int i = 0; i < genvals.length; i++) { String spec = specs[i]; genvals[i] = parseRange(spec); len+=genvals[i].length; } vals = new long[len]; int atlen=0; for (int i = 0; i < genvals.length; i++) { System.arraycopy(genvals[i],0,vals,atlen,genvals[i].length); atlen+=genvals[i].length; } } } return vals; } private long[] parseRange(String spec) { Matcher comma_matcher = COMMA_VALS.matcher(spec); if (comma_matcher.matches()) { String vals = comma_matcher.group("vals"); long[] longvals = Arrays.stream(vals.split(",")).mapToLong(Long::valueOf).toArray(); return longvals; } Matcher range_matcher = RANGE_VALS.matcher(spec); if (range_matcher.matches()) { long from=Long.parseLong(range_matcher.group("from")); long to=Long.parseLong(range_matcher.group("to")); String step_size = range_matcher.group("step"); long step = 1L; if (step_size!=null) { step = Long.parseLong(step_size); } if (fromto && step>=0) { throw new RuntimeException("for decreasing from-to of (" +from+"-"+to+":, stepsize must be negative."); } long sizeL = (Math.abs(from-to) / Math.abs(step))+1; if (sizeL>Integer.MAX_VALUE) { throw new RuntimeException("example size " + sizeL + " is too big."); } long[] vals = new long[(int)sizeL]; long sign = (step>0 ? 1L : -1L); for (int i = 0; i < vals.length; i++) { vals[i]=from+(step*i); } return vals; } throw new RuntimeException("Unable to parse spec pattern: '"+spec+"'"); } }




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