1 /** 2 * Copyright (C) 2007 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.inject.internal.util; 18 19 import static com.google.common.base.Preconditions.checkNotNull; 20 21 import java.lang.reflect.Constructor; 22 import java.lang.reflect.Field; 23 import java.lang.reflect.Member; 24 import java.lang.reflect.Method; 25 import java.lang.reflect.Modifier; 26 27 /** 28 * Class utilities. 29 */ 30 public final class Classes { 31 32 public static boolean isInnerClass(Class<?> clazz) { 33 return !Modifier.isStatic(clazz.getModifiers()) 34 && clazz.getEnclosingClass() != null; 35 } 36 37 public static boolean isConcrete(Class<?> clazz) { 38 int modifiers = clazz.getModifiers(); 39 return !clazz.isInterface() && !Modifier.isAbstract(modifiers); 40 } 41 42 /** 43 * Formats a member as concise string, such as {@code java.util.ArrayList.size}, 44 * {@code java.util.ArrayList<init>()} or {@code java.util.List.remove()}. 45 */ 46 public static String toString(Member member) { 47 Class<? extends Member> memberType = Classes.memberType(member); 48 49 if (memberType == Method.class) { 50 return member.getDeclaringClass().getName() + "." + member.getName() + "()"; 51 } else if (memberType == Field.class) { 52 return member.getDeclaringClass().getName() + "." + member.getName(); 53 } else if (memberType == Constructor.class) { 54 return member.getDeclaringClass().getName() + ".<init>()"; 55 } else { 56 throw new AssertionError(); 57 } 58 } 59 60 /** 61 * Returns {@code Field.class}, {@code Method.class} or {@code Constructor.class}. 62 */ 63 public static Class<? extends Member> memberType(Member member) { 64 checkNotNull(member, "member"); 65 66 if (member instanceof Field) { 67 return Field.class; 68 69 } else if (member instanceof Method) { 70 return Method.class; 71 72 } else if (member instanceof Constructor) { 73 return Constructor.class; 74 75 } else { 76 throw new IllegalArgumentException( 77 "Unsupported implementation class for Member, " + member.getClass()); 78 } 79 } 80 } 81
