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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.api.templates;

import io.nosqlbench.virtdata.api.ValuesBinder;
import io.nosqlbench.virtdata.api.Bindings;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.function.Function;

/**
 * StringCompositor provides a way to build strings from a string template and provided values.
 *
 * 

* The template is simply an array of string values, where odd indices represent token positions, and even indices represent * literals. This version of the StringCompositor fetches data from the bindings only for the named fields in the template. *

*/ public class StringCompositor implements ValuesBinder { // protected static Pattern tokenPattern = Pattern.compile("(?
(?([^{])+)?(?\\{(?[a-zA-Z0-9-_.]+)?\\})?)"); private String[] templateSegments; private Function stringfunc = String::valueOf; /** * Create a string template which has positional tokens, in "{}" form. * * @param template The string template */ public StringCompositor(String template) { templateSegments = parseTemplate(template); } public StringCompositor(String template, Function stringfunc) { this(template); this.stringfunc = stringfunc; } // for testing protected String[] parseTemplate(String template) { ParsedTemplate parsed = new ParsedTemplate(template, Collections.emptyMap()); return parsed.getSpans(); } // // for testing // protected String[] parseSection(String template) { // StringBuilder literalBuf = new StringBuilder(); // int i = 0; // for (; i < template.length(); i++) { // char c = template.charAt(i); // if (c == '\\') { // i++; // c = template.charAt(i); // literalBuf.append(c); // } else if (c != '{') { // literalBuf.append(c); // } else { // i++; // break; // } // } // StringBuilder tokenBuf = new StringBuilder(); // for (; i < template.length(); i++) { // char c = template.charAt(i); // if (c != '}') { // tokenBuf.append(c); // } else { // i++; // break; // } // } // String literal=literalBuf.toString(); // String token = tokenBuf.toString(); // if (token.length()>0) { // return new String[] { literalBuf.toString(), tokenBuf.toString(), template.substring(i)}; // } else { // return new String[] { literalBuf.toString() }; // } // } // // /** // * Parse the template according to the description for {@link StringCompositor}. // * // * @param template A string template. // * @return A template array. // */ // protected String[] parseTemplate(String template) { // List sections = new ArrayList<>(); // // String[] parts = parseSection(template); // while (parts.length>0) { // sections.add(parts[0]); // if (parts.length>1) { // sections.add(parts[1]); // } // parts = parts.length>=2 ? parseSection(parts[2]) : new String[0]; // } // if ((sections.size() % 2) == 0) { // sections.add(""); // } // return sections.toArray(new String[0]); // } @Override public String bindValues(StringCompositor context, Bindings bindings, long cycle) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < templateSegments.length; i++) { if (i % 2 == 0) { sb.append(templateSegments[i]); } else { String key = templateSegments[i]; Object value = bindings.get(key, cycle); String valueString = stringfunc.apply(value); sb.append(valueString); } } return sb.toString(); } public List getBindPointNames() { List tokens = new ArrayList<>(); for (int i = 0; i < templateSegments.length; i++) { if (i % 2 == 1) { tokens.add(templateSegments[i]); } } return tokens; } }




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