jetbrick.bean.KlassInfo Maven / Gradle / Ivy
/**
* Copyright 2013-2016 Guoqiang Chen, Shanghai, China. All rights reserved.
*
* Author: Guoqiang Chen
* Email: [email protected]
* WebURL: https://github.com/subchen
*
* 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.
*/
package jetbrick.bean;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import jetbrick.bean.Filters.FieldFilter;
import jetbrick.bean.Filters.MethodFilter;
import jetbrick.bean.asm.AsmAccessor;
import jetbrick.bean.asm.AsmFactory;
import jetbrick.util.concurrent.ConcurrentInitializer;
import jetbrick.util.concurrent.LazyInitializer;
/**
* 代表一个 Class.
*
* @author Guoqiang Chen
*/
public final class KlassInfo {
private static final ConcurrentHashMap, KlassInfo> pool = new ConcurrentHashMap, KlassInfo>(128);
/**
* 将 Class 对象转成 KlassInfo 对象 (有缓存).
*
* @param clazz - 原始对象
* @return KlassInfo 对象
*/
public static KlassInfo create(final Class clazz) {
KlassInfo klass = pool.get(clazz);
if (klass == null) {
klass = new KlassInfo(clazz);
KlassInfo old = pool.putIfAbsent(clazz, klass);
if (old != null) {
klass = old;
}
}
return klass;
}
private final Class clazz;
private KlassInfo(Class type) {
this.clazz = type;
}
@SuppressWarnings("unchecked")
public Class getType() {
return (Class) clazz;
}
public String getName() {
return clazz.getName();
}
public String getSimpleName() {
return clazz.getSimpleName();
}
public KlassInfo getSuperKlass() {
Class superKlass = clazz.getSuperclass();
return (superKlass == null) ? null : KlassInfo.create(superKlass);
}
public List getInterfaces() {
Class[] interfaces = clazz.getInterfaces();
if (interfaces.length == 0) {
return Collections.emptyList();
}
List results = new ArrayList(interfaces.length);
for (Class intf : interfaces) {
results.add(KlassInfo.create(intf));
}
return results;
}
// ------------------------------------------------------------------
public Annotation[] getAnnotations() {
return clazz.getAnnotations();
}
public T getAnnotation(Class annotationClass) {
return clazz.getAnnotation(annotationClass);
}
public boolean isAnnotationPresent(Class annotationClass) {
return clazz.isAnnotationPresent(annotationClass);
}
// ------------------------------------------------------------------
public int getModifiers() {
return clazz.getModifiers();
}
public boolean isInterface() {
return Modifier.isInterface(getModifiers());
}
public boolean isAbstract() {
return Modifier.isAbstract(getModifiers());
}
public boolean isStatic() {
return Modifier.isStatic(getModifiers());
}
public boolean isPrivate() {
return Modifier.isPrivate(getModifiers());
}
public boolean isProtected() {
return Modifier.isProtected(getModifiers());
}
public boolean isPublic() {
return Modifier.isPublic(getModifiers());
}
// ------------------------------------------------------------------
private final ConcurrentInitializer> declaredConstructorsGetter = new LazyInitializer>() {
@Override
protected List initialize() {
Constructor[] constructors = clazz.getDeclaredConstructors();
if (constructors.length == 0) {
return Collections.emptyList();
} else {
ArrayList results = new ArrayList(constructors.length);
for (int i = 0; i < constructors.length; i++) {
results.add(new ConstructorInfo(KlassInfo.this, constructors[i], i));
}
results.trimToSize();
return Collections.unmodifiableList(results);
}
}
};
public List getDeclaredConstructors() {
return declaredConstructorsGetter.get();
}
/**
* 根据目标参数类型，查找完全匹配的构造函数.
*
* @param parameterTypes - 匹配的构造函数参数
* @return 找到的构造函数对象，找不到返回 null.
*/
public ConstructorInfo getDeclaredConstructor(Class... parameterTypes) {
return ExecutableUtils.getExecutable(declaredConstructorsGetter.get(), null, parameterTypes);
}
/**
* 根据目标参数类型，查找最佳匹配的构造函数.
*
* @param parameterTypes - 匹配的构造函数参数
* @return 找到的构造函数对象，找不到返回 null.
*/
public ConstructorInfo searchDeclaredConstructor(Class... parameterTypes) {
ConstructorInfo constructor = ExecutableUtils.getExecutable(declaredConstructorsGetter.get(), null, parameterTypes);
if (constructor == null) {
constructor = ExecutableUtils.searchExecutable(declaredConstructorsGetter.get(), null, parameterTypes);
}
return constructor;
}
public ConstructorInfo getDeclaredConstructor(Constructor constructor) {
for (ConstructorInfo info : declaredConstructorsGetter.get()) {
if (info.getConstructor() == constructor) {
return info;
}
}
return null;
}
public ConstructorInfo getDefaultConstructor() {
for (ConstructorInfo info : declaredConstructorsGetter.get()) {
if (info.isDefault()) {
return info;
}
}
return null;
}
// ------------------------------------------------------------------
private final ConcurrentInitializer> declaredMethodsGetter = new LazyInitializer>() {
@Override
protected List initialize() {
Method[] methods = clazz.getDeclaredMethods();
if (methods.length == 0) {
return Collections.emptyList();
} else {
ArrayList results = new ArrayList(methods.length);
for (int i = 0; i < methods.length; i++) {
results.add(new MethodInfo(KlassInfo.this, methods[i], i));
}
results.trimToSize();
return Collections.unmodifiableList(results);
}
}
};
public List getDeclaredMethods() {
return declaredMethodsGetter.get();
}
public List getDeclaredMethods(MethodFilter filter) {
List methods = declaredMethodsGetter.get();
if (methods.size() == 0) {
return methods;
}
List results = new ArrayList(methods.size());
for (MethodInfo method : methods) {
if (filter.accept(method)) {
results.add(method);
}
}
return results;
}
public MethodInfo getDeclaredMethod(String name, Class... parameterTypes) {
return ExecutableUtils.getExecutable(declaredMethodsGetter.get(), name, parameterTypes);
}
public MethodInfo getDeclaredMethod(Method method) {
for (MethodInfo info : declaredMethodsGetter.get()) {
if (info.getMethod() == method) {
return info;
}
}
return null;
}
private final ConcurrentInitializer> methodsGetter = new LazyInitializer>() {
@Override
protected List initialize() {
KlassInfo klass = KlassInfo.this;
List declaredMethods = klass.getDeclaredMethods();
ArrayList results = new ArrayList(declaredMethods.size() + 16);
// 1. add interfaces
for (KlassInfo parent : klass.getInterfaces()) {
for (MethodInfo method : parent.getMethods()) {
results.add(method);
}
}
// 2. add super class
KlassInfo parent = klass.getSuperKlass();
if (parent != null) {
for (MethodInfo method : parent.getMethods()) {
// 只加入 super class 中 public, 非 static 的 (这些方法一般是被认为可继承的)
if (method.isPublic() && !method.isStatic()) {
results.add(method);
}
}
}
// 3. add self
results.addAll(declaredMethods);
results.trimToSize();
return Collections.unmodifiableList(results);
}
};
public List getMethods() {
return methodsGetter.get();
}
public List getMethods(MethodFilter filter) {
List methods = methodsGetter.get();
if (methods.size() == 0) {
return methods;
}
List results = new ArrayList(methods.size());
for (MethodInfo method : methods) {
if (filter.accept(method)) {
results.add(method);
}
}
return results;
}
/**
* 根据目标参数类型，查找完全匹配的方法.
*
* @param parameterTypes - 匹配的方法参数
* @return 找到的方法对象，找不到返回 null.
*/
public MethodInfo getMethod(String name, Class... parameterTypes) {
return ExecutableUtils.getExecutable(methodsGetter.get(), name, parameterTypes);
}
/**
* 根据目标参数类型，查找最佳匹配的方法.
*
* @param parameterTypes - 匹配的方法参数
* @return 找到的方法对象，找不到返回 null.
*/
public MethodInfo searchMethod(String name, Class... parameterTypes) {
MethodInfo method = ExecutableUtils.getExecutable(methodsGetter.get(), name, parameterTypes);
if (method == null) {
method = ExecutableUtils.searchExecutable(methodsGetter.get(), name, parameterTypes);
}
return method;
}
// ------------------------------------------------------------------
private final ConcurrentInitializer> declaredFieldsGetter = new LazyInitializer>() {
@Override
protected List initialize() {
Field[] fields = clazz.getDeclaredFields();
if (fields.length == 0) {
return Collections.emptyList();
}
ArrayList results = new ArrayList(fields.length);
for (int i = 0; i < fields.length; i++) {
results.add(new FieldInfo(KlassInfo.this, fields[i], i));
}
results.trimToSize();
return Collections.unmodifiableList(results);
}
};
public List getDeclaredFields() {
return declaredFieldsGetter.get();
}
public List getDeclaredFields(FieldFilter filter) {
List fields = declaredFieldsGetter.get();
if (fields.size() == 0) {
return fields;
}
List results = new ArrayList(fields.size());
for (FieldInfo field : fields) {
if (filter.accept(field)) {
results.add(field);
}
}
return results;
}
public FieldInfo getDeclaredField(String name) {
for (FieldInfo field : declaredFieldsGetter.get()) {
if (field.getName().equals(name)) {
return field;
}
}
return null;
}
public FieldInfo getDeclaredField(Field field) {
for (FieldInfo info : declaredFieldsGetter.get()) {
if (info.getField() == field) {
return info;
}
}
return null;
}
private final ConcurrentInitializer> fieldsGetter = new LazyInitializer>() {
@Override
protected List initialize() {
KlassInfo klass = KlassInfo.this;
List declaredFields = klass.getDeclaredFields();
ArrayList results = new ArrayList(declaredFields.size() + 8);
results.addAll(declaredFields);
for (KlassInfo parent : klass.getInterfaces()) {
for (FieldInfo field : parent.getFields()) {
// 只加入 super interface 中 public， 非 static 的字段 (这些字段一般是被认为可继承的)
if (field.isPublic() && !field.isStatic()) {
results.add(field);
}
}
}
KlassInfo parent = klass.getSuperKlass();
if (parent != null) {
for (FieldInfo field : parent.getFields()) {
// 只加入 super class 中 public， 非 static 的字段 (这些字段一般是被认为可继承的)
if (field.isPublic() && !field.isStatic()) {
results.add(field);
}
}
}
results.trimToSize();
return Collections.unmodifiableList(results);
}
};
public List getFields() {
return fieldsGetter.get();
}
public List getFields(FieldFilter filter) {
List fields = fieldsGetter.get();
if (fields.size() == 0) {
return fields;
}
List results = new ArrayList(fields.size());
for (FieldInfo field : fields) {
if (filter.accept(field)) {
results.add(field);
}
}
return results;
}
public FieldInfo getField(String name) {
for (FieldInfo field : fieldsGetter.get()) {
if (field.getName().equals(name)) {
return field;
}
}
return null;
}
// ------------------------------------------------------------------
private final ConcurrentInitializer> propertiesGetter = new LazyInitializer>() {
@Override
protected List initialize() {
List methods = methodsGetter.get();
Map map = new HashMap(methods.size());
for (MethodInfo method : methods) {
if (method.isStatic() || !method.isPublic()) continue; // 属性必须是 public 的
if (method.isReadMethod()) {
String name = method.getPropertyName();
PropertyInfo propertyInfo = map.get(name);
if (propertyInfo == null) {
propertyInfo = new PropertyInfo(KlassInfo.this, name);
map.put(name, propertyInfo);
}
propertyInfo.setGetter(method);
} else if (method.isWriteMethod()) {
String name = method.getPropertyName();
PropertyInfo propertyInfo = map.get(name);
if (propertyInfo == null) {
propertyInfo = new PropertyInfo(KlassInfo.this, name);
map.put(name, propertyInfo);
}
propertyInfo.setSetter(method);
}
}
if (map.size() == 0) {
return Collections.emptyList();
}
return Collections.unmodifiableList(new ArrayList(map.values()));
}
};
public List getProperties() {
return propertiesGetter.get();
}
public PropertyInfo getProperty(String name) {
for (PropertyInfo prop : propertiesGetter.get()) {
if (prop.getName().equals(name)) {
return prop;
}
}
return null;
}
// ------------------------------------------------------------------
private AsmAccessor asmAccessor; // ASM 生成的类的实例
private int asmCallNumber = 0; // 反射调用计数器，超过阈值，则使用 ASM 字节码增强技术
protected AsmAccessor getAsmAccessor() {
if (asmAccessor == null) {
if (asmCallNumber >= AsmFactory.getThreshold()) {
asmAccessor = AsmFactory.generateAccessor(this);
} else {
asmCallNumber++;
}
}
return asmAccessor;
}
/**
* 调用默认的构造函数生成对象实例.
*
* @return 生成的对象实例.
* @throws IllegalStateException - 如果找不到默认的构造函数或者没有访问权限，那么抛出该异常.
*/
public Object newInstance() throws IllegalStateException {
AsmAccessor accessor = getAsmAccessor();
if (accessor == null) {
ConstructorInfo ctor = getDefaultConstructor();
if (ctor != null) {
return ctor.newInstance();
}
throw new IllegalStateException("No default constructor");
} else {
return accessor.newInstance();
}
}
// ------------------------------------------------------------------
@Override
public String toString() {
return clazz.toString();
}
}
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