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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.common;

import java.lang.reflect.Modifier;

public class Classes {

    /**
     * The package separator character '.'
     */
    private static final char PACKAGE_SEPARATOR = '.';

    /**
     * Determine the name of the package of the given class:
     * e.g. "java.lang" for the java.lang.String class.
     *
     * @param clazz the class
     * @return the package name, or the empty String if the class
     *         is defined in the default package
     */
    public static String getPackageName(Class clazz) {
        String className = clazz.getName();
        int lastDotIndex = className.lastIndexOf(PACKAGE_SEPARATOR);
        return (lastDotIndex != -1 ? className.substring(0, lastDotIndex) : "");
    }

    public static boolean isInnerClass(Class clazz) {
        return Modifier.isStatic(clazz.getModifiers()) == false && clazz.getEnclosingClass() != null;
    }

    public static boolean isConcrete(Class clazz) {
        int modifiers = clazz.getModifiers();
        return clazz.isInterface() == false && Modifier.isAbstract(modifiers) == false;
    }

    private Classes() {}
}