1 /* 2 * Copyright (C) 2010 The Android Open Source Project 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 libcore.util; 18 19 import java.lang.reflect.Field; 20 import java.lang.reflect.Modifier; 21 import java.util.Arrays; 22 23 public final class Objects { 24 private Objects() {} 25 26 /** 27 * Returns true if two possibly-null objects are equal. 28 */ 29 public static boolean equal(Object a, Object b) { 30 return a == b || (a != null && a.equals(b)); 31 } 32 33 public static int hashCode(Object o) { 34 return (o == null) ? 0 : o.hashCode(); 35 } 36 37 /** 38 * Returns a string reporting the value of each declared field, via reflection. 39 * Static and transient fields are automatically skipped. Produces output like 40 * "SimpleClassName[integer=1234,string="hello",character='c',intArray=[1,2,3]]". 41 */ 42 public static String toString(Object o) { 43 Class<?> c = o.getClass(); 44 StringBuilder sb = new StringBuilder(); 45 sb.append(c.getSimpleName()).append('['); 46 int i = 0; 47 for (Field f : c.getDeclaredFields()) { 48 if ((f.getModifiers() & (Modifier.STATIC | Modifier.TRANSIENT)) != 0) { 49 continue; 50 } 51 f.setAccessible(true); 52 try { 53 Object value = f.get(o); 54 55 if (i++ > 0) { 56 sb.append(','); 57 } 58 59 sb.append(f.getName()); 60 sb.append('='); 61 62 if (value.getClass().isArray()) { 63 if (value.getClass() == boolean[].class) { 64 sb.append(Arrays.toString((boolean[]) value)); 65 } else if (value.getClass() == byte[].class) { 66 sb.append(Arrays.toString((byte[]) value)); 67 } else if (value.getClass() == char[].class) { 68 sb.append(Arrays.toString((char[]) value)); 69 } else if (value.getClass() == double[].class) { 70 sb.append(Arrays.toString((double[]) value)); 71 } else if (value.getClass() == float[].class) { 72 sb.append(Arrays.toString((float[]) value)); 73 } else if (value.getClass() == int[].class) { 74 sb.append(Arrays.toString((int[]) value)); 75 } else if (value.getClass() == long[].class) { 76 sb.append(Arrays.toString((long[]) value)); 77 } else if (value.getClass() == short[].class) { 78 sb.append(Arrays.toString((short[]) value)); 79 } else { 80 sb.append(Arrays.toString((Object[]) value)); 81 } 82 } else if (value.getClass() == Character.class) { 83 sb.append('\'').append(value).append('\''); 84 } else if (value.getClass() == String.class) { 85 sb.append('"').append(value).append('"'); 86 } else { 87 sb.append(value); 88 } 89 } catch (IllegalAccessException unexpected) { 90 throw new AssertionError(unexpected); 91 } 92 } 93 sb.append("]"); 94 return sb.toString(); 95 } 96 } 97
