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Moxy Compiler library for Android

There is a newer version: 2.2.2

package moxy.compiler;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

import javax.lang.model.element.Element;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.Modifier;

public abstract class AnnotationRule {

    protected final ElementKind mValidKind;

    protected final Set mValidModifiers;

    protected StringBuilder mErrorBuilder;

    public AnnotationRule(ElementKind validKind, Modifier... validModifiers) {
        if (validModifiers == null || validModifiers.length == 0) {
            throw new RuntimeException("Valid modifiers cant be empty or null.");
        }

        mValidKind = validKind;
        mValidModifiers = new HashSet<>(Arrays.asList(validModifiers));
        mErrorBuilder = new StringBuilder();
    }

    /**
     * Method describe rules for using Annotation.
     *
     * @param AnnotatedField Checking annotated field.
     */
    public abstract void checkAnnotation(Element AnnotatedField);

    public String getErrorStack() {
        return mErrorBuilder.toString();
    }

    protected String validModifiersToString() {
        if (mValidModifiers.size() > 1) {
            StringBuilder result = new StringBuilder("one of [");
            boolean addSeparator = false;
            for (Modifier validModifier : mValidModifiers) {
                if (addSeparator) {
                    result.append(", ");
                }
                addSeparator = true;
                result.append(validModifier.toString());
            }
            result.append("]");
            return result.toString();
        } else {
            return mValidModifiers.iterator().next() + ".";
        }
    }
}