CoverageConverter.java

// Copyright (c) 2015 Uber
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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package com.uber.jenkins.phabricator.coverage;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Convert {filename: int[] hitCount} data into the Harbormaster format
 *
 * This is a string, where each character represents a line. The code is as follows:
 *
 * 'N': not executable
 * 'C': covered
 * 'U': uncovered
 *
 * For example a hit count of {null, 2, 0, 1} we would get "NCUC"
 */
public class CoverageConverter {
    /**
     * Convert line coverage to the Harbormaster coverage format
     * @return The Harbormaster-formatted coverage
     */
    public Map<String, String> convert(Map<String, List<Integer>> lineCoverage) {
        Map<String, String> results = new HashMap<String, String>();
        for (Map.Entry<String, List<Integer>> entry : lineCoverage.entrySet()) {
            results.put(entry.getKey(), convertFileCoverage(entry.getValue()));
        }

        return results;
    }

    private String convertFileCoverage(List<Integer> lineCoverage) {
        StringBuilder sb = new StringBuilder();
        for (Integer line : lineCoverage) {
            // Can't use a case statement because NULL
            if (line == null) {
                sb.append('N');
            } else if (line == 0) {
                sb.append('U');
            } else {
                sb.append('C');
            }
        }
        return sb.toString();
    }
}