001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.hbase.util; 019 020import org.apache.yetus.audience.InterfaceAudience; 021 022/** 023 * Utilities for class manipulation. 024 */ 025@InterfaceAudience.Private 026public class Classes { 027 028 /** 029 * Equivalent of {@link Class#forName(String)} which also returns classes for primitives like 030 * <code>boolean</code>, etc. n * The name of the class to retrieve. Can be either a normal class 031 * or a primitive class. 032 * @return The class specified by <code>className</code> n * If the requested class can not be 033 * found. 034 */ 035 public static Class<?> extendedForName(String className) throws ClassNotFoundException { 036 Class<?> valueType; 037 if (className.equals("boolean")) { 038 valueType = boolean.class; 039 } else if (className.equals("byte")) { 040 valueType = byte.class; 041 } else if (className.equals("short")) { 042 valueType = short.class; 043 } else if (className.equals("int")) { 044 valueType = int.class; 045 } else if (className.equals("long")) { 046 valueType = long.class; 047 } else if (className.equals("float")) { 048 valueType = float.class; 049 } else if (className.equals("double")) { 050 valueType = double.class; 051 } else if (className.equals("char")) { 052 valueType = char.class; 053 } else { 054 valueType = Class.forName(className); 055 } 056 return valueType; 057 } 058 059 public static String stringify(Class<?>[] classes) { 060 StringBuilder buf = new StringBuilder(); 061 if (classes != null) { 062 for (Class<?> c : classes) { 063 if (buf.length() > 0) { 064 buf.append(","); 065 } 066 buf.append(c.getName()); 067 } 068 } else { 069 buf.append("NULL"); 070 } 071 return buf.toString(); 072 } 073 074 @SuppressWarnings("unchecked") 075 public static <T> Class<T> cast(Class<?> clazz) { 076 return (Class<T>) clazz; 077 } 078}