fuin.org

Asserting methods are not used

Example:
Prevent a "java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result." caused by calling BigDecimal's divide or setScale without a rounding mode:

// Path to '*.class' files
final File classesDir = new File("target/classes");

// Can be used to exclude some files/packages
final FileFilter fileFilter = new FileFilter() {
    @Override
    public boolean accept(File file) {
        return !file.getPath().contains("my/pkg/to/exclude");
    }
};

// Define methods to find
final MCAMethod divide = new MCAMethod("java.math.BigDecimal",
        "java.math.BigDecimal divide(java.math.BigDecimal)");

final MCAMethod setScale = new MCAMethod("java.math.BigDecimal",
        "java.math.BigDecimal setScale(int)");

// Fails if any class calls one of the two methods
AssertUsage.assertMethodsNotUsed(classesDir, fileFilter, divide, setScale);