com.github.datalking.beans.factory.support.AutowireUtils Maven / Gradle / Ivy
package com.github.datalking.beans.factory.support;
import com.github.datalking.beans.factory.ObjectFactory;
import com.github.datalking.beans.factory.config.TypedStringValue;
import com.github.datalking.util.Assert;
import com.github.datalking.util.ClassUtils;
import java.beans.PropertyDescriptor;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Proxy;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Set;
/**
* @author yaoo on 5/29/18
*/
public abstract class AutowireUtils {
public static void sortConstructors(Constructor[] constructors) {
Arrays.sort(constructors, new Comparator>() {
public int compare(Constructor c1, Constructor c2) {
boolean p1 = Modifier.isPublic(c1.getModifiers());
boolean p2 = Modifier.isPublic(c2.getModifiers());
if (p1 != p2) {
return (p1 ? -1 : 1);
}
int c1pl = c1.getParameterTypes().length;
int c2pl = c2.getParameterTypes().length;
return (new Integer(c1pl)).compareTo(c2pl) * -1;
}
});
}
public static void sortFactoryMethods(Method[] factoryMethods) {
Arrays.sort(factoryMethods, new Comparator() {
public int compare(Method fm1, Method fm2) {
boolean p1 = Modifier.isPublic(fm1.getModifiers());
boolean p2 = Modifier.isPublic(fm2.getModifiers());
if (p1 != p2) {
return (p1 ? -1 : 1);
}
int c1pl = fm1.getParameterTypes().length;
int c2pl = fm2.getParameterTypes().length;
return (new Integer(c1pl)).compareTo(c2pl) * -1;
}
});
}
public static boolean isExcludedFromDependencyCheck(PropertyDescriptor pd) {
Method wm = pd.getWriteMethod();
if (wm == null) {
return false;
}
if (!wm.getDeclaringClass().getName().contains("$$")) {
// Not a CGLIB method so it's OK.
return false;
}
// It was declared by CGLIB, but we might still want to autowire it
// if it was actually declared by the superclass.
Class superclass = wm.getDeclaringClass().getSuperclass();
return !ClassUtils.hasMethod(superclass, wm.getName(), wm.getParameterTypes());
}
public static boolean isSetterDefinedInInterface(PropertyDescriptor pd, Set> interfaces) {
Method setter = pd.getWriteMethod();
if (setter != null) {
Class targetClass = setter.getDeclaringClass();
for (Class ifc : interfaces) {
if (ifc.isAssignableFrom(targetClass) &&
ClassUtils.hasMethod(ifc, setter.getName(), setter.getParameterTypes())) {
return true;
}
}
}
return false;
}
public static Object resolveAutowiringValue(Object autowiringValue, Class requiredType) {
if (autowiringValue instanceof ObjectFactory && !requiredType.isInstance(autowiringValue)) {
ObjectFactory factory = (ObjectFactory) autowiringValue;
if (autowiringValue instanceof Serializable && requiredType.isInterface()) {
autowiringValue = Proxy.newProxyInstance(requiredType.getClassLoader(),
new Class[]{requiredType}, new ObjectFactoryDelegatingInvocationHandler(factory));
} else {
return factory.getObject();
}
}
return autowiringValue;
}
public static Class resolveReturnTypeForFactoryMethod(Method method, Object[] args, ClassLoader classLoader) {
Assert.notNull(method, "Method must not be null");
Assert.notNull(args, "Argument array must not be null");
Assert.notNull(classLoader, "ClassLoader must not be null");
TypeVariable[] declaredTypeVariables = method.getTypeParameters();
Type genericReturnType = method.getGenericReturnType();
Type[] methodParameterTypes = method.getGenericParameterTypes();
Assert.isTrue(args.length == methodParameterTypes.length, "Argument array does not match parameter count");
// Ensure that the type variable (e.g., T) is declared directly on the method
// itself (e.g., via ), not on the enclosing class or interface.
boolean locallyDeclaredTypeVariableMatchesReturnType = false;
for (TypeVariable currentTypeVariable : declaredTypeVariables) {
if (currentTypeVariable.equals(genericReturnType)) {
locallyDeclaredTypeVariableMatchesReturnType = true;
break;
}
}
if (locallyDeclaredTypeVariableMatchesReturnType) {
for (int i = 0; i < methodParameterTypes.length; i++) {
Type methodParameterType = methodParameterTypes[i];
Object arg = args[i];
if (methodParameterType.equals(genericReturnType)) {
if (arg instanceof TypedStringValue) {
TypedStringValue typedValue = ((TypedStringValue) arg);
if (typedValue.hasTargetType()) {
return typedValue.getTargetType();
}
try {
return typedValue.resolveTargetType(classLoader);
} catch (ClassNotFoundException ex) {
throw new IllegalStateException("Failed to resolve value type [" +
typedValue.getTargetTypeName() + "] for factory method argument", ex);
}
}
// Only consider argument type if it is a simple value...
// if (arg != null && !(arg instanceof BeanMetadataElement)) {
if (arg != null && !(arg instanceof AbstractBeanDefinition)) {
return arg.getClass();
}
return method.getReturnType();
} else if (methodParameterType instanceof ParameterizedType) {
ParameterizedType parameterizedType = (ParameterizedType) methodParameterType;
Type[] actualTypeArguments = parameterizedType.getActualTypeArguments();
for (Type typeArg : actualTypeArguments) {
if (typeArg.equals(genericReturnType)) {
if (arg instanceof Class) {
return (Class) arg;
} else {
String className = null;
if (arg instanceof String) {
className = (String) arg;
} else if (arg instanceof TypedStringValue) {
TypedStringValue typedValue = ((TypedStringValue) arg);
String targetTypeName = typedValue.getTargetTypeName();
if (targetTypeName == null || Class.class.getName().equals(targetTypeName)) {
className = typedValue.getValue();
}
}
if (className != null) {
try {
return ClassUtils.forName(className, classLoader);
} catch (ClassNotFoundException ex) {
throw new IllegalStateException("Could not resolve class name [" + arg +
"] for factory method argument", ex);
}
}
// Consider adding logic to determine the class of the typeArg, if possible.
// For now, just fall back...
return method.getReturnType();
}
}
}
}
}
}
// Fall back...
return method.getReturnType();
}
/**
* Reflective InvocationHandler for lazy access to the current target object.
*/
@SuppressWarnings("serial")
private static class ObjectFactoryDelegatingInvocationHandler implements InvocationHandler, Serializable {
private final ObjectFactory objectFactory;
public ObjectFactoryDelegatingInvocationHandler(ObjectFactory objectFactory) {
this.objectFactory = objectFactory;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
String methodName = method.getName();
if (methodName.equals("equals")) {
// Only consider equal when proxies are identical.
return (proxy == args[0]);
} else if (methodName.equals("hashCode")) {
// Use hashCode of proxy.
return System.identityHashCode(proxy);
} else if (methodName.equals("toString")) {
return this.objectFactory.toString();
}
try {
return method.invoke(this.objectFactory.getObject(), args);
} catch (InvocationTargetException ex) {
throw ex.getTargetException();
}
}
}
}
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