private static File getJavadocExecutable()

in src/main/java/org/apache/sling/feature/maven/mojos/apis/JavadocExecutor.java [120:160]
29 lines of code
12 McCabe index (conditional complexity)

    private static File getJavadocExecutable() throws MojoExecutionException {
        String javadocCommand = "javadoc" + (SystemUtils.IS_OS_WINDOWS ? ".exe" : "");

        File javadocExe;

        // For IBM's JDK 1.2
        if (SystemUtils.IS_OS_AIX) {
            javadocExe = getFile(SystemUtils.getJavaHome(), "..", "sh", javadocCommand);
        }
        // For Apple's JDK 1.6.x (and older?) on Mac OSX
        else if (SystemUtils.IS_OS_MAC_OSX && org.apache.commons.lang.SystemUtils.JAVA_VERSION_FLOAT < 1.7f) {
            javadocExe = getFile(SystemUtils.getJavaHome(), "bin", javadocCommand);
        } else {
            javadocExe = getFile(SystemUtils.getJavaHome(), "..", "bin", javadocCommand);
        }

        // ----------------------------------------------------------------------
        // Try to find javadocExe from JAVA_HOME environment variable
        // ----------------------------------------------------------------------
        if (!javadocExe.exists() || !javadocExe.isFile()) {
            String javaHome = System.getenv().get("JAVA_HOME");
            if (StringUtils.isEmpty(javaHome)) {
                throw new MojoExecutionException("The environment variable JAVA_HOME is not correctly set.");
            }

            File javaHomeDir = new File(javaHome);
            if ((!javaHomeDir.exists()) || javaHomeDir.isFile()) {
                throw new MojoExecutionException("The environment variable JAVA_HOME=" + javaHome
                        + " doesn't exist or is not a valid directory.");
            }

            javadocExe = getFile(javaHomeDir, "bin", javadocCommand);
        }

        if (!javadocExe.exists() || !javadocExe.isFile()) {
            throw new MojoExecutionException("The javadoc executable '" + javadocExe
                    + "' doesn't exist or is not a file. Verify the JAVA_HOME environment variable.");
        }

        return javadocExe;
    }