Creating a custom matcher

gistfile1.java

new AbstractAtomMatcher(){
    @Override
    public boolean matchers(IAtom query, IAtom subject) {
        Object descriptor1 = query.getProperty("stereo.descriptor");
        Object descriptor2 = subject.getProperty("stereo.descriptor");
        return descriptor1 != null ? descriptor1.equals(descriptor2) : descriptor2 == null;
    }
};