com.alibaba.dubbo.common.compiler.support.ClassUtils Maven / Gradle / Ivy
/*
* Copyright 1999-2011 Alibaba Group.
*
* 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 com.alibaba.dubbo.common.compiler.support;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.reflect.Array;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
/**
* ClassUtils. (Tool, Static, ThreadSafe)
*
* @author william.liangf
*/
public class ClassUtils {
public static final String CLASS_EXTENSION = ".class";
public static final String JAVA_EXTENSION = ".java";
public static Object newInstance(String name) {
try {
return forName(name).newInstance();
} catch (InstantiationException e) {
throw new IllegalStateException(e.getMessage(), e);
} catch (IllegalAccessException e) {
throw new IllegalStateException(e.getMessage(), e);
}
}
public static Class forName(String[] packages, String className) {
try {
return _forName(className);
} catch (ClassNotFoundException e) {
if (packages != null && packages.length > 0) {
for (String pkg : packages) {
try {
return _forName(pkg + "." + className);
} catch (ClassNotFoundException e2) {
}
}
}
throw new IllegalStateException(e.getMessage(), e);
}
}
public static Class forName(String className) {
try {
return _forName(className);
} catch (ClassNotFoundException e) {
throw new IllegalStateException(e.getMessage(), e);
}
}
public static Class _forName(String className) throws ClassNotFoundException {
if ("boolean".equals(className))
return boolean.class;
if ("byte".equals(className))
return byte.class;
if ("char".equals(className))
return char.class;
if ("short".equals(className))
return short.class;
if ("int".equals(className))
return int.class;
if ("long".equals(className))
return long.class;
if ("float".equals(className))
return float.class;
if ("double".equals(className))
return double.class;
if ("boolean[]".equals(className))
return boolean[].class;
if ("byte[]".equals(className))
return byte[].class;
if ("char[]".equals(className))
return char[].class;
if ("short[]".equals(className))
return short[].class;
if ("int[]".equals(className))
return int[].class;
if ("long[]".equals(className))
return long[].class;
if ("float[]".equals(className))
return float[].class;
if ("double[]".equals(className))
return double[].class;
try {
return arrayForName(className);
} catch (ClassNotFoundException e) {
if (className.indexOf('.') == -1) { // 尝试java.lang包
try {
return arrayForName("java.lang." + className);
} catch (ClassNotFoundException e2) {
// 忽略尝试异常, 抛出原始异常
}
}
throw e;
}
}
private static Class arrayForName(String className) throws ClassNotFoundException {
return Class.forName(className.endsWith("[]")
? "[L" + className.substring(0, className.length() - 2) + ";"
: className, true, Thread.currentThread().getContextClassLoader());
}
public static Class getBoxedClass(Class type) {
if (type == boolean.class) {
return Boolean.class;
} else if (type == char.class) {
return Character.class;
} else if (type == byte.class) {
return Byte.class;
} else if (type == short.class) {
return Short.class;
} else if (type == int.class) {
return Integer.class;
} else if (type == long.class) {
return Long.class;
} else if (type == float.class) {
return Float.class;
} else if (type == double.class) {
return Double.class;
} else {
return type;
}
}
public static Boolean boxed(boolean v) {
return Boolean.valueOf(v);
}
public static Character boxed(char v) {
return Character.valueOf(v);
}
public static Byte boxed(byte v) {
return Byte.valueOf(v);
}
public static Short boxed(short v) {
return Short.valueOf(v);
}
public static Integer boxed(int v) {
return Integer.valueOf(v);
}
public static Long boxed(long v) {
return Long.valueOf(v);
}
public static Float boxed(float v) {
return Float.valueOf(v);
}
public static Double boxed(double v) {
return Double.valueOf(v);
}
public static Object boxed(Object v) {
return v;
}
public static boolean unboxed(Boolean v) {
return v == null ? false : v.booleanValue();
}
public static char unboxed(Character v) {
return v == null ? '\0' : v.charValue();
}
public static byte unboxed(Byte v) {
return v == null ? 0 : v.byteValue();
}
public static short unboxed(Short v) {
return v == null ? 0 : v.shortValue();
}
public static int unboxed(Integer v) {
return v == null ? 0 : v.intValue();
}
public static long unboxed(Long v) {
return v == null ? 0 : v.longValue();
}
public static float unboxed(Float v) {
return v == null ? 0 : v.floatValue();
}
public static double unboxed(Double v) {
return v == null ? 0 : v.doubleValue();
}
public static Object unboxed(Object v) {
return v;
}
public static boolean isNotEmpty(Object object) {
return getSize(object) > 0;
}
public static int getSize(Object object) {
if (object == null) {
return 0;
} if (object instanceof Collection) {
return ((Collection)object).size();
} else if (object instanceof Map) {
return ((Map)object).size();
} else if (object.getClass().isArray()) {
return Array.getLength(object);
} else {
return -1;
}
}
public static URI toURI(String name) {
try {
return new URI(name);
} catch (URISyntaxException e) {
throw new RuntimeException(e);
}
}
public static Class getGenericClass(Class cls) {
return getGenericClass(cls, 0);
}
public static Class getGenericClass(Class cls, int i) {
try {
ParameterizedType parameterizedType = ((ParameterizedType) cls.getGenericInterfaces()[0]);
Object genericClass = parameterizedType.getActualTypeArguments()[i];
if (genericClass instanceof ParameterizedType) { // 处理多级泛型
return (Class) ((ParameterizedType) genericClass).getRawType();
} else if (genericClass instanceof GenericArrayType) { // 处理数组泛型
return (Class) ((GenericArrayType) genericClass).getGenericComponentType();
} else if (genericClass != null) {
return (Class) genericClass;
}
} catch (Throwable e) {
}
if (cls.getSuperclass() != null) {
return getGenericClass(cls.getSuperclass(), i);
} else {
throw new IllegalArgumentException(cls.getName() + " generic type undefined!");
}
}
public static boolean isBeforeJava5(String javaVersion) {
return (javaVersion == null || javaVersion.length() == 0 || "1.0".equals(javaVersion)
|| "1.1".equals(javaVersion) || "1.2".equals(javaVersion)
|| "1.3".equals(javaVersion) || "1.4".equals(javaVersion));
}
public static boolean isBeforeJava6(String javaVersion) {
return isBeforeJava5(javaVersion) || "1.5".equals(javaVersion);
}
public static String toString(Throwable e) {
StringWriter w = new StringWriter();
PrintWriter p = new PrintWriter(w);
p.print(e.getClass().getName() + ": ");
if (e.getMessage() != null) {
p.print(e.getMessage() + "\n");
}
p.println();
try {
e.printStackTrace(p);
return w.toString();
} finally {
p.close();
}
}
private static final int JIT_LIMIT = 5 * 1024;
public static void checkBytecode(String name, byte[] bytecode) {
if (bytecode.length > JIT_LIMIT) {
System.err.println("The template bytecode too long, may be affect the JIT compiler. template class: " + name);
}
}
public static String getSizeMethod(Class cls) {
try {
return cls.getMethod("size", new Class[0]).getName() + "()";
} catch (NoSuchMethodException e) {
try {
return cls.getMethod("length", new Class[0]).getName() + "()";
} catch (NoSuchMethodException e2) {
try {
return cls.getMethod("getSize", new Class[0]).getName() + "()";
} catch (NoSuchMethodException e3) {
try {
return cls.getMethod("getLength", new Class[0]).getName() + "()";
} catch (NoSuchMethodException e4) {
return null;
}
}
}
}
}
public static String getMethodName(Method method, Class[] parameterClasses, String rightCode) {
if (method.getParameterTypes().length > parameterClasses.length) {
Class[] types = method.getParameterTypes();
StringBuilder buf = new StringBuilder(rightCode);
for (int i = parameterClasses.length; i < types.length; i ++) {
if (buf.length() > 0) {
buf.append(",");
}
Class type = types[i];
String def;
if (type == boolean.class) {
def = "false";
} else if (type == char.class) {
def = "\'\\0\'";
} else if (type == byte.class
|| type == short.class
|| type == int.class
|| type == long.class
|| type == float.class
|| type == double.class) {
def = "0";
} else {
def = "null";
}
buf.append(def);
}
}
return method.getName() + "(" + rightCode + ")";
}
public static Method searchMethod(Class currentClass, String name, Class[] parameterTypes) throws NoSuchMethodException {
if (currentClass == null) {
throw new NoSuchMethodException("class == null");
}
try {
return currentClass.getMethod(name, parameterTypes);
} catch (NoSuchMethodException e) {
for (Method method : currentClass.getMethods()) {
if (method.getName().equals(name)
&& parameterTypes.length == method.getParameterTypes().length
&& Modifier.isPublic(method.getModifiers())) {
if (parameterTypes.length > 0) {
Class[] types = method.getParameterTypes();
boolean match = true;
for (int i = 0; i < parameterTypes.length; i ++) {
if (! types[i].isAssignableFrom(parameterTypes[i])) {
match = false;
break;
}
}
if (! match) {
continue;
}
}
return method;
}
}
throw e;
}
}
public static String getInitCode(Class type) {
if (byte.class.equals(type)
|| short.class.equals(type)
|| int.class.equals(type)
|| long.class.equals(type)
|| float.class.equals(type)
|| double.class.equals(type)) {
return "0";
} else if (char.class.equals(type)) {
return "'\\0'";
} else if (boolean.class.equals(type)) {
return "false";
} else {
return "null";
}
}
public static Map toMap(Map.Entry[] entries) {
Map map = new HashMap();
if (entries != null && entries.length > 0) {
for (Map.Entry enrty : entries) {
map.put(enrty.getKey(), enrty.getValue());
}
}
return map;
}
private ClassUtils() {}
}
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