hprose.io.access.Accessors Maven / Gradle / Ivy
/**********************************************************\
| |
| hprose |
| |
| Official WebSite: http://www.hprose.com/ |
| http://www.hprose.org/ |
| |
\**********************************************************/
/**********************************************************\
* *
* Accessors.java *
* *
* Accessors class for Java. *
* *
* LastModified: Feb 26, 2018 *
* Author: Ma Bingyao *
* *
\**********************************************************/
package hprose.io.access;
import hprose.io.HproseMode;
import hprose.util.ClassUtil;
import hprose.util.LinkedCaseInsensitiveMap;
import java.io.Serializable;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public final class Accessors {
private final static ConcurrentHashMap> propertiesCache = new ConcurrentHashMap>();
private final static ConcurrentHashMap> membersCache = new ConcurrentHashMap>();
private final static ConcurrentHashMap> fieldsCache = new ConcurrentHashMap>();
private static sun.misc.Unsafe getUnsafe() {
try {
return sun.misc.Unsafe.getUnsafe();
}
catch (Exception e) {}
try {
Class k = sun.misc.Unsafe.class;
for (Field f : k.getDeclaredFields()) {
f.setAccessible(true);
Object x = f.get(null);
if (k.isInstance(x)) return k.cast(x);
}
return null;
}
catch (Exception e) {
return null;
}
}
final static sun.misc.Unsafe unsafe = getUnsafe();
public final static boolean isAndroid() {
String vmName = System.getProperty("java.vm.name");
if (vmName == null) {
return false;
}
String lowerVMName = vmName.toLowerCase();
return lowerVMName.contains("dalvik") ||
lowerVMName.contains("lemur");
}
private static Method findGetter(Method[] methods, String name, Class paramType) {
String getterName = "get" + name;
String isGetterName = "is" + name;
for (Method method : methods) {
if (Modifier.isStatic(method.getModifiers())) {
continue;
}
String methodName = method.getName();
if (!methodName.equals(getterName) && !methodName.equals(isGetterName)) {
continue;
}
if (!method.getReturnType().equals(paramType)) {
continue;
}
if (method.getParameterTypes().length == 0) {
return method;
}
}
return null;
}
private static Map getProperties(Type type) {
LinkedCaseInsensitiveMap properties = propertiesCache.get(type);
if (properties == null) {
properties = new LinkedCaseInsensitiveMap();
Method[] methods = ClassUtil.toClass(type).getMethods();
for (Method setter : methods) {
if (Modifier.isStatic(setter.getModifiers())) {
continue;
}
String name = setter.getName();
if (!name.startsWith("set")) {
continue;
}
if (!setter.getReturnType().equals(void.class)) {
continue;
}
Class[] paramTypes = setter.getParameterTypes();
if (paramTypes.length != 1) {
continue;
}
String propertyName = name.substring(3);
Method getter = findGetter(methods, propertyName, paramTypes[0]);
if (getter != null) {
PropertyAccessor propertyAccessor = new PropertyAccessor(type, getter, setter);
char[] cname = propertyName.toCharArray();
cname[0] = Character.toLowerCase(cname[0]);
propertyName = new String(cname);
properties.put(propertyName, propertyAccessor);
}
}
propertiesCache.put(type, properties);
}
return properties;
}
private static MemberAccessor getFieldAccessor(Type type, Field field) {
if (unsafe != null && !isAndroid()) {
Class cls = field.getType();
if (cls == int.class) {
return new IntFieldAccessor(field);
}
if (cls == byte.class) {
return new ByteFieldAccessor(field);
}
if (cls == short.class) {
return new ShortFieldAccessor(field);
}
if (cls == long.class) {
return new LongFieldAccessor(field);
}
if (cls == boolean.class) {
return new BoolFieldAccessor(field);
}
if (cls == char.class) {
return new CharFieldAccessor(field);
}
if (cls == float.class) {
return new FloatFieldAccessor(field);
}
if (cls == double.class) {
return new DoubleFieldAccessor(field);
}
return new FieldAccessor(type, field);
}
return new SafeFieldAccessor(type, field);
}
private static Map getFields(Type type) {
LinkedCaseInsensitiveMap fields = fieldsCache.get(type);
if (fields == null) {
fields = new LinkedCaseInsensitiveMap();
for (Class clazz = ClassUtil.toClass(type); clazz != null; clazz = clazz.getSuperclass()) {
Field[] fs = clazz.getDeclaredFields();
for (Field field : fs) {
int mod = field.getModifiers();
if (!Modifier.isTransient(mod) && !Modifier.isStatic(mod)) {
String fieldName = field.getName();
fields.put(fieldName, getFieldAccessor(type, field));
}
}
}
fieldsCache.put(type, fields);
}
return fields;
}
private static Map getMembers(Type type) {
LinkedCaseInsensitiveMap members = membersCache.get(type);
if (members == null) {
Class clazz = ClassUtil.toClass(type);
members = new LinkedCaseInsensitiveMap();
Method[] methods = clazz.getMethods();
for (Method setter : methods) {
if (Modifier.isStatic(setter.getModifiers())) {
continue;
}
String name = setter.getName();
if (!name.startsWith("set")) {
continue;
}
Class returnType = setter.getReturnType();
if (!returnType.equals(void.class) && !returnType.isAssignableFrom(clazz)) {
continue;
}
Class[] paramTypes = setter.getParameterTypes();
if (paramTypes.length != 1) {
continue;
}
String propertyName = name.substring(3);
Method getter = findGetter(methods, propertyName, paramTypes[0]);
if (getter != null) {
PropertyAccessor propertyAccessor = new PropertyAccessor(type, getter, setter);
char[] cname = propertyName.toCharArray();
cname[0] = Character.toLowerCase(cname[0]);
propertyName = new String(cname);
members.put(propertyName, propertyAccessor);
}
}
Field[] fs = clazz.getFields();
for (Field field : fs) {
int mod = field.getModifiers();
if (!Modifier.isTransient(mod) && !Modifier.isStatic(mod)) {
String fieldName = field.getName();
members.put(fieldName, getFieldAccessor(type, field));
}
}
membersCache.put(type, members);
}
return members;
}
public final static Map getMembers(Type type, HproseMode mode) {
Class clazz = ClassUtil.toClass(type);
return ((mode != HproseMode.MemberMode) && Serializable.class.isAssignableFrom(clazz)) ?
(mode == HproseMode.FieldMode) ?
getFields(type) :
getProperties(type) :
getMembers(type);
}
}