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Comprehensive Java common library (Java7+)
/*
* Copyright (C) 2015-2017 S.Violet
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Project GitHub: https://github.com/shepherdviolet/thistle
* Email: [email protected]
*/
package sviolet.thistle.util.reflect;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import sviolet.thistle.util.judge.CheckUtils;
/**
* 将一个类或一个对象的数据/构造函数/方法打印出来
*
* @author S.Violet
*/
public class ClassPrinter {
private static final String PRINTER_TITLE = "============================ClassPrinter============================\n";
private static final String NULL_CLASS = "============================ClassPrinter============================\nClass:null";
private static final String NULL_OBJECT = "============================ClassPrinter============================\nObject:null";
/**
* 打印class
* @param clazz class
* @param traversals true:遍历父类
*/
public static String print(Class clazz, boolean traversals) throws IllegalAccessException {
return print(clazz, traversals, true, true, true);
}
/**
* 打印class
* @param clazz class
* @param traversals true:遍历父类
* @param printFields 输出fields
* @param printConstructors 输出构造器
* @param printMethods 输出方法
*/
public static String print(Class clazz, boolean traversals, boolean printFields, boolean printConstructors, boolean printMethods) throws IllegalAccessException {
if (clazz == null){
return NULL_CLASS;
}
Class current = clazz;
StringBuilder stringBuilder = new StringBuilder(PRINTER_TITLE);
print(current, null, stringBuilder, printFields, printConstructors, printMethods);
while(traversals && (current = current.getSuperclass()) != null){
print(current, null, stringBuilder, printFields, printConstructors, printMethods);
}
return stringBuilder.toString();
}
/**
* 打印对象
* @param obj 对象
* @param traversals true:遍历父类
*/
public static String print(Object obj, boolean traversals) throws IllegalAccessException {
return print(obj, traversals, true, true, true);
}
/**
* 打印对象
* @param obj 对象
* @param traversals true:遍历父类
* @param printFields 输出fields
* @param printConstructors 输出构造器
* @param printMethods 输出方法
*/
public static String print(Object obj, boolean traversals, boolean printFields, boolean printConstructors, boolean printMethods) throws IllegalAccessException {
if (obj == null){
return NULL_OBJECT;
}
Class current = obj.getClass();
StringBuilder stringBuilder = new StringBuilder(PRINTER_TITLE);
print(current, obj, stringBuilder, printFields, printConstructors, printMethods);
while(traversals && (current = current.getSuperclass()) != null){
print(current, obj, stringBuilder, printFields, printConstructors, printMethods);
}
return stringBuilder.toString();
}
private static void print(Class clazz, Object obj, StringBuilder stringBuilder, boolean printFields, boolean printConstructors, boolean printMethods) throws IllegalAccessException {
printClassInfo(clazz, stringBuilder);
if (printFields) {
printClassFields(clazz, obj, stringBuilder);
}
if (printConstructors) {
printClassConstructors(clazz, stringBuilder);
}
if (printMethods) {
printClassMethods(clazz, stringBuilder);
}
}
private static void printClassMethods(Class clazz, StringBuilder stringBuilder) {
stringBuilder.append("\n--------------Methods--------------");
Method[] methods = ReflectCache.getDeclaredMethods(clazz);
for (Method method : methods) {
String name = method.getName();
if (name.contains("$")){
continue;
}
stringBuilder.append("\n");
printModifiers(method.getModifiers(), stringBuilder);
stringBuilder.append(method.getReturnType().getName());
stringBuilder.append(" ");
stringBuilder.append(name);
stringBuilder.append("(");
Class[] paramTypes = method.getParameterTypes();
if (paramTypes != null) {
for (int i = 0 ; i < paramTypes.length ; i++){
if (i != 0){
stringBuilder.append(", ");
}
stringBuilder.append(paramTypes[i].getName());
}
}
stringBuilder.append(")");
}
}
private static void printClassConstructors(Class clazz, StringBuilder stringBuilder) {
stringBuilder.append("\n--------------Constructors--------------");
Constructor[] constructors = ReflectCache.getDeclaredConstructors(clazz);
for (Constructor constructor : constructors) {
stringBuilder.append("\n");
printModifiers(constructor.getModifiers(), stringBuilder);
stringBuilder.append(clazz.getSimpleName());
stringBuilder.append("(");
Class[] paramTypes = constructor.getParameterTypes();
if (paramTypes != null) {
for (int j = 0 ; j < paramTypes.length ; j++){
if (j != 0){
stringBuilder.append(", ");
}
stringBuilder.append(paramTypes[j].getName());
}
}
stringBuilder.append(")");
}
}
private static void printClassFields(Class clazz, Object obj, StringBuilder stringBuilder) throws IllegalAccessException {
stringBuilder.append("\n--------------Fields--------------");
Field[] fields = ReflectCache.getDeclaredFields(clazz);
for (Field field : fields) {
int modifiers = field.getModifiers();
String name = field.getName();
if (name.contains("$")){
continue;
}
field.setAccessible(true);
stringBuilder.append("\n");
printModifiers(modifiers, stringBuilder);
stringBuilder.append(field.getType().getName());
stringBuilder.append(" ");
stringBuilder.append(name);
if (obj != null || CheckUtils.isFlagMatch(modifiers, Modifier.STATIC)) {
stringBuilder.append(" = ");
stringBuilder.append(field.get(obj));
}
}
}
private static void printClassInfo(Class clazz, StringBuilder stringBuilder) {
stringBuilder.append("\n++++++++++++++++++++++++Class++++++++++++++++++++++++\n");
printModifiers(clazz.getModifiers(), stringBuilder);
stringBuilder.append(clazz.getName());
}
private static void printModifiers(int modifiers, StringBuilder stringBuilder){
if (CheckUtils.isFlagMatch(modifiers, Modifier.PUBLIC)){
stringBuilder.append("public ");
}
if (CheckUtils.isFlagMatch(modifiers, Modifier.PRIVATE)){
stringBuilder.append("private ");
}
if (CheckUtils.isFlagMatch(modifiers, Modifier.PROTECTED)){
stringBuilder.append("protected ");
}
if (CheckUtils.isFlagMatch(modifiers, Modifier.STATIC)){
stringBuilder.append("static ");
}
if (CheckUtils.isFlagMatch(modifiers, Modifier.FINAL)){
stringBuilder.append("final ");
}
if (CheckUtils.isFlagMatch(modifiers, Modifier.SYNCHRONIZED)){
stringBuilder.append("synchronized ");
}
if (CheckUtils.isFlagMatch(modifiers, Modifier.VOLATILE)){
stringBuilder.append("volatile ");
}
if (CheckUtils.isFlagMatch(modifiers, Modifier.NATIVE)){
stringBuilder.append("native ");
}
if (CheckUtils.isFlagMatch(modifiers, Modifier.INTERFACE)){
stringBuilder.append("interface ");
}
if (CheckUtils.isFlagMatch(modifiers, Modifier.ABSTRACT)){
stringBuilder.append("abstract ");
}
if (CheckUtils.isFlagMatch(modifiers, Modifier.STRICT)){
stringBuilder.append("strict ");
}
}
}