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package org.apache.ibatis.reflection;
import org.apache.ibatis.reflection.invoker.GetFieldInvoker;
import org.apache.ibatis.reflection.invoker.Invoker;
import org.apache.ibatis.reflection.invoker.MethodInvoker;
import org.apache.ibatis.reflection.invoker.SetFieldInvoker;
import org.apache.ibatis.reflection.property.PropertyNamer;
import java.lang.reflect.*;
import java.util.*;
/**
* This class represents a cached set of class definition information that
* allows for easy mapping between property names and getter/setter methods.
*/
public class Reflector {
private static boolean classCacheEnabled = true;
private static final String[] EMPTY_STRING_ARRAY = new String[0];
private static final Map REFLECTOR_MAP = Collections.synchronizedMap(new HashMap());
private Class type;
private String[] readablePropertyNames = EMPTY_STRING_ARRAY;
private String[] writeablePropertyNames = EMPTY_STRING_ARRAY;
private Map setMethods = new HashMap();
private Map getMethods = new HashMap();
private Map setTypes = new HashMap();
private Map getTypes = new HashMap();
private Constructor defaultConstructor;
private Map caseInsensitivePropertyMap = new HashMap();
private Reflector(Class clazz) {
type = clazz;
addDefaultConstructor(clazz);
addGetMethods(clazz);
addSetMethods(clazz);
addFields(clazz);
readablePropertyNames = getMethods.keySet().toArray(new String[getMethods.keySet().size()]);
writeablePropertyNames = setMethods.keySet().toArray(new String[setMethods.keySet().size()]);
for (String propName : readablePropertyNames) {
caseInsensitivePropertyMap.put(propName.toUpperCase(), propName);
}
for (String propName : writeablePropertyNames) {
caseInsensitivePropertyMap.put(propName.toUpperCase(), propName);
}
}
private void addDefaultConstructor(Class clazz) {
Constructor[] consts = clazz.getDeclaredConstructors();
for (Constructor constructor : consts) {
if (constructor.getParameterTypes().length == 0) {
if (canAccessPrivateMethods()) {
try {
constructor.setAccessible(true);
} catch (Exception e) {
// Ignored. This is only a final precaution, nothing we can do.
}
}
if (constructor.isAccessible()) {
this.defaultConstructor = constructor;
}
}
}
}
private void addGetMethods(Class cls) {
Method[] methods = getClassMethods(cls);
for (Method method : methods) {
String name = method.getName();
if (name.startsWith("get") && name.length() > 3) {
if (method.getParameterTypes().length == 0) {
name = PropertyNamer.methodToProperty(name);
addGetMethod(name, method);
}
} else if (name.startsWith("is") && name.length() > 2) {
if (method.getParameterTypes().length == 0) {
name = PropertyNamer.methodToProperty(name);
addGetMethod(name, method);
}
}
}
}
private void addGetMethod(String name, Method method) {
if (isValidPropertyName(name)) {
getMethods.put(name, new MethodInvoker(method));
getTypes.put(name, method.getReturnType());
}
}
private void addSetMethods(Class cls) {
Map> conflictingSetters = new HashMap>();
Method[] methods = getClassMethods(cls);
for (Method method : methods) {
String name = method.getName();
if (name.startsWith("set") && name.length() > 3) {
if (method.getParameterTypes().length == 1) {
name = PropertyNamer.methodToProperty(name);
addSetterConflict(conflictingSetters, name, method);
}
}
}
resolveSetterConflicts(conflictingSetters);
}
private void addSetterConflict(Map> conflictingSetters, String name, Method method) {
List list = conflictingSetters.get(name);
if (list == null) {
list = new ArrayList();
conflictingSetters.put(name, list);
}
list.add(method);
}
private void resolveSetterConflicts(Map> conflictingSetters) {
for (String propName : conflictingSetters.keySet()) {
List setters = conflictingSetters.get(propName);
Method firstMethod = setters.get(0);
if (setters.size() == 1) {
addSetMethod(propName, firstMethod);
} else {
Class expectedType = getTypes.get(propName);
if (expectedType == null) {
throw new ReflectionException("Illegal overloaded setter method with ambiguous type for property "
+ propName + " in class " + firstMethod.getDeclaringClass() + ". This breaks the JavaBeans " +
"specification and can cause unpredicatble results.");
} else {
Iterator methods = setters.iterator();
Method setter = null;
while (methods.hasNext()) {
Method method = methods.next();
if (method.getParameterTypes().length == 1
&& expectedType.equals(method.getParameterTypes()[0])) {
setter = method;
break;
}
}
if (setter == null) {
throw new ReflectionException("Illegal overloaded setter method with ambiguous type for property "
+ propName + " in class " + firstMethod.getDeclaringClass() + ". This breaks the JavaBeans " +
"specification and can cause unpredicatble results.");
}
addSetMethod(propName, setter);
}
}
}
}
private void addSetMethod(String name, Method method) {
if (isValidPropertyName(name)) {
setMethods.put(name, new MethodInvoker(method));
setTypes.put(name, method.getParameterTypes()[0]);
}
}
private void addFields(Class clazz) {
Field[] fields = clazz.getDeclaredFields();
for (Field field : fields) {
if (canAccessPrivateMethods()) {
try {
field.setAccessible(true);
} catch (Exception e) {
// Ignored. This is only a final precaution, nothing we can do.
}
}
if (field.isAccessible()) {
if (!setMethods.containsKey(field.getName())) {
if (!Modifier.isFinal(field.getModifiers())) {
addSetField(field);
}
}
if (!getMethods.containsKey(field.getName())) {
addGetField(field);
}
}
}
if (clazz.getSuperclass() != null) {
addFields(clazz.getSuperclass());
}
}
private void addSetField(Field field) {
if (isValidPropertyName(field.getName())) {
setMethods.put(field.getName(), new SetFieldInvoker(field));
setTypes.put(field.getName(), field.getType());
}
}
private void addGetField(Field field) {
if (isValidPropertyName(field.getName())) {
getMethods.put(field.getName(), new GetFieldInvoker(field));
getTypes.put(field.getName(), field.getType());
}
}
private boolean isValidPropertyName(String name) {
return !(name.startsWith("$") || "serialVersionUID".equals(name) || "class".equals(name));
}
/**
* This method returns an array containing all methods
* declared in this class and any superclass.
* We use this method, instead of the simpler Class.getMethods(),
* because we want to look for private methods as well.
*
* @param cls The class
* @return An array containing all methods in this class
*/
private Method[] getClassMethods(Class cls) {
HashMap uniqueMethods = new HashMap();
Class currentClass = cls;
while (currentClass != null) {
addUniqueMethods(uniqueMethods, currentClass.getDeclaredMethods());
// we also need to look for interface methods -
// because the class may be abstract
Class[] interfaces = currentClass.getInterfaces();
for (Class anInterface : interfaces) {
addUniqueMethods(uniqueMethods, anInterface.getMethods());
}
currentClass = currentClass.getSuperclass();
}
Collection methods = uniqueMethods.values();
return methods.toArray(new Method[methods.size()]);
}
private void addUniqueMethods(HashMap uniqueMethods, Method[] methods) {
for (Method currentMethod : methods) {
if (!currentMethod.isBridge()) {
String signature = getSignature(currentMethod);
// check to see if the method is already known
// if it is known, then an extended class must have
// overridden a method
if (!uniqueMethods.containsKey(signature)) {
if (canAccessPrivateMethods()) {
try {
currentMethod.setAccessible(true);
} catch (Exception e) {
// Ignored. This is only a final precaution, nothing we can do.
}
}
uniqueMethods.put(signature, currentMethod);
}
}
}
}
private String getSignature(Method method) {
StringBuffer sb = new StringBuffer();
sb.append(method.getName());
Class[] parameters = method.getParameterTypes();
for (int i = 0; i < parameters.length; i++) {
if (i == 0) {
sb.append(':');
} else {
sb.append(',');
}
sb.append(parameters[i].getName());
}
return sb.toString();
}
private static boolean canAccessPrivateMethods() {
try {
SecurityManager securityManager = System.getSecurityManager();
if (null != securityManager) {
securityManager.checkPermission(new ReflectPermission("suppressAccessChecks"));
}
} catch (SecurityException e) {
return false;
}
return true;
}
/**
* Gets the name of the class the instance provides information for
*
* @return The class name
*/
public Class getType() {
return type;
}
public Constructor getDefaultConstructor() {
if (defaultConstructor != null) {
return defaultConstructor;
} else {
throw new ReflectionException("There is no default constructor for " + type);
}
}
public Invoker getSetInvoker(String propertyName) {
Invoker method = setMethods.get(propertyName);
if (method == null) {
throw new ReflectionException("There is no setter for property named '" + propertyName + "' in '" + type + "'");
}
return method;
}
public Invoker getGetInvoker(String propertyName) {
Invoker method = getMethods.get(propertyName);
if (method == null) {
throw new ReflectionException("There is no getter for property named '" + propertyName + "' in '" + type + "'");
}
return method;
}
/**
* Gets the type for a property setter
*
* @param propertyName - the name of the property
* @return The Class of the propery setter
*/
public Class getSetterType(String propertyName) {
Class clazz = setTypes.get(propertyName);
if (clazz == null) {
throw new ReflectionException("There is no setter for property named '" + propertyName + "' in '" + type + "'");
}
return clazz;
}
/**
* Gets the type for a property getter
*
* @param propertyName - the name of the property
* @return The Class of the propery getter
*/
public Class getGetterType(String propertyName) {
Class clazz = getTypes.get(propertyName);
if (clazz == null) {
throw new ReflectionException("There is no getter for property named '" + propertyName + "' in '" + type + "'");
}
return clazz;
}
/**
* Gets an array of the readable properties for an object
*
* @return The array
*/
public String[] getGetablePropertyNames() {
return readablePropertyNames;
}
/**
* Gets an array of the writeable properties for an object
*
* @return The array
*/
public String[] getSetablePropertyNames() {
return writeablePropertyNames;
}
/**
* Check to see if a class has a writeable property by name
*
* @param propertyName - the name of the property to check
* @return True if the object has a writeable property by the name
*/
public boolean hasSetter(String propertyName) {
return setMethods.keySet().contains(propertyName);
}
/**
* Check to see if a class has a readable property by name
*
* @param propertyName - the name of the property to check
* @return True if the object has a readable property by the name
*/
public boolean hasGetter(String propertyName) {
return getMethods.keySet().contains(propertyName);
}
public String findPropertyName(String name) {
return caseInsensitivePropertyMap.get(name.toUpperCase());
}
/**
* Gets an instance of ClassInfo for the specified class.
*
* @param clazz The class for which to lookup the method cache.
* @return The method cache for the class
*/
public static Reflector forClass(Class clazz) {
if (classCacheEnabled) {
synchronized (clazz) {
Reflector cached = REFLECTOR_MAP.get(clazz);
if (cached == null) {
cached = new Reflector(clazz);
REFLECTOR_MAP.put(clazz, cached);
}
return cached;
}
} else {
return new Reflector(clazz);
}
}
public static void setClassCacheEnabled(boolean classCacheEnabled) {
Reflector.classCacheEnabled = classCacheEnabled;
}
public static boolean isClassCacheEnabled() {
return classCacheEnabled;
}
}
