ToolchainModel doGetToolchainModel()

in src/main/java/org/apache/maven/plugins/toolchain/jdk/ToolchainDiscoverer.java [258:313]
54 lines of code
6 McCabe index (conditional complexity)

    ToolchainModel doGetToolchainModel(Path jdk) {
        Path java = jdk.resolve("bin").resolve("java");
        if (!Files.exists(java)) {
            java = jdk.resolve("bin").resolve("java.exe");
            if (!Files.exists(java)) {
                log.debug("JDK toolchain discovered at " + jdk
                        + " will be ignored: unable to find bin/java or bin\\java.exe");
                return null;
            }
        }
        if (!java.toFile().canExecute()) {
            log.debug("JDK toolchain discovered at " + jdk
                    + " will be ignored: the bin/java or bin\\java.exe is not executable");
            return null;
        }
        List<String> lines;
        try {
            Path temp = Files.createTempFile("jdk-opts-", ".out");
            try {
                new ProcessBuilder()
                        .command(java.toString(), "-XshowSettings:properties", "-version")
                        .redirectError(temp.toFile())
                        .start()
                        .waitFor();
                lines = Files.readAllLines(temp);
            } finally {
                Files.delete(temp);
            }
        } catch (IOException | InterruptedException e) {
            log.debug("JDK toolchain discovered at " + jdk + " will be ignored: error executing java: " + e);
            return null;
        }

        Map<String, String> properties = new LinkedHashMap<>();
        Stream.of(PROPERTIES).forEach(name -> {
            lines.stream()
                    .filter(l -> l.contains(JAVA + name))
                    .map(l -> l.replaceFirst(".*=\\s*(.*)", "$1"))
                    .findFirst()
                    .ifPresent(value -> properties.put(name, value));
        });
        if (!properties.containsKey(VERSION)) {
            log.debug("JDK toolchain discovered at " + jdk + " will be ignored: could not obtain " + JAVA + VERSION);
            return null;
        }

        ToolchainModel model = new ToolchainModel();
        model.setType(TOOLCHAIN_TYPE_JDK);
        properties.forEach(model::addProvide);
        Xpp3Dom configuration = new Xpp3Dom("configuration");
        Xpp3Dom jdkHome = new Xpp3Dom(JDK_HOME);
        jdkHome.setValue(jdk.toString());
        configuration.addChild(jdkHome);
        model.setConfiguration(configuration);
        return model;
    }