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/**
* Copyright 2013 John Ericksen
*
* 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 org.parceler;
import java.lang.reflect.*;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
/**
* Utility class for performing a variety of operations through reflection. This functionality should be used sparingly
* as frequent calls can cause performance issues.
*
* @author John Ericksen
*/
public final class InjectionUtil {
public static final String GET_FIELD_METHOD = "getField";
public static final String SET_FIELD_METHOD = "setField";
public static final String CALL_METHOD_METHOD = "callMethod";
public static final String CALL_CONSTRUCTOR_METHOD = "callConstructor";
private InjectionUtil() {
//singleton constructor
}
/**
* Returns the value of a field.
*
* @param returnType type of the field
* @param targetClass class represented by the target parameter
* @param target object containing the field
* @param field name of the field
* @param type parameter
* @return field value
*/
public static T getField(Class returnType, Class targetClass, Object target, String field) {
try {
Field declaredField = targetClass.getDeclaredField(field);
return AccessController.doPrivileged(
new GetFieldPrivilegedAction(declaredField, target));
} catch (NoSuchFieldException e) {
throw new ParcelerRuntimeException(
"NoSuchFieldException Exception during field injection: " + field + " in " + target.getClass(), e);
} catch (PrivilegedActionException e) {
throw new ParcelerRuntimeException("PrivilegedActionException Exception during field injection", e);
} catch (Exception e) {
throw new ParcelerRuntimeException("Exception during field injection", e);
}
}
private static final class GetFieldPrivilegedAction extends AccessibleElementPrivilegedAction {
private final Object target;
private GetFieldPrivilegedAction(Field classField, Object target) {
super(classField);
this.target = target;
}
@Override
public T run(Field classField) throws IllegalAccessException {
return (T) classField.get(target);
}
}
/**
* Updates field with the given value.
*
* @param targetClass class representing the object containing the field.
* @param target object containing the field to update
* @param field name of the field
* @param value object to update the field to
*/
public static void setField(Class targetClass, Object target, String field, Object value) {
try {
Field classField = targetClass.getDeclaredField(field);
AccessController.doPrivileged(
new SetFieldPrivilegedAction(classField, target, value));
} catch (NoSuchFieldException e) {
throw new ParcelerRuntimeException(
"NoSuchFieldException Exception during field injection: " + field + " in " + target.getClass(), e);
} catch (PrivilegedActionException e) {
throw new ParcelerRuntimeException("PrivilegedActionException Exception during field injection", e);
} catch (Exception e) {
throw new ParcelerRuntimeException("Exception during field injection", e);
}
}
private static final class SetFieldPrivilegedAction extends AccessibleElementPrivilegedAction {
private final Object target;
private final Object value;
private SetFieldPrivilegedAction(Field classField, Object target, Object value) {
super(classField);
this.target = target;
this.value = value;
}
@Override
public Void run(Field classField) throws IllegalAccessException {
classField.set(target, value);
return null;
}
}
/**
* Calls a method with the provided arguments as parameters.
*
* @param retClass the method return value
* @param targetClass the instance class
* @param target the instance containing the method
* @param method the method name
* @param argClasses types of the method arguments
* @param args method arguments used during invocation
* @param relating type parameter
* @return method return value
*/
public static T callMethod(Class retClass, Class targetClass, Object target, String method, Class[] argClasses, Object[] args) {
try {
Method classMethod = targetClass.getDeclaredMethod(method, argClasses);
return AccessController.doPrivileged(
new SetMethodPrivilegedAction(classMethod, target, args));
} catch (NoSuchMethodException e) {
throw new ParcelerRuntimeException("Exception during method injection: NoSuchFieldException", e);
} catch (PrivilegedActionException e) {
throw new ParcelerRuntimeException("PrivilegedActionException Exception during field injection", e);
} catch (Exception e) {
throw new ParcelerRuntimeException("Exception during field injection", e);
}
}
private static final class SetMethodPrivilegedAction extends AccessibleElementPrivilegedAction {
private final Object target;
private final Object[] args;
private SetMethodPrivilegedAction(Method classMethod, Object target, Object[] args) {
super(classMethod);
this.target = target;
this.args = args;
}
public T run(Method classMethod) throws InvocationTargetException, IllegalAccessException {
return (T) classMethod.invoke(target, args);
}
}
/**
* Instantiates a class by calling the constructor.
*
* @param targetClass instance type to construct
* @param argClasses argument types accepted by the constructor
* @param args constructor argument values
* @param relating type parameter
* @return instance created by constructor
*/
public static T callConstructor(Class targetClass, Class[] argClasses, Object[] args) {
T output;
try {
Constructor classConstructor = targetClass.getDeclaredConstructor(argClasses);
output = AccessController.doPrivileged(
new SetConstructorPrivilegedAction(classConstructor, args));
} catch (NoSuchMethodException e) {
throw new ParcelerRuntimeException("Exception during method injection: NoSuchMethodException", e);
} catch (PrivilegedActionException e) {
throw new ParcelerRuntimeException("PrivilegedActionException Exception during field injection", e);
} catch (Exception e) {
throw new ParcelerRuntimeException("Exception during field injection", e);
}
return output;
}
private static final class SetConstructorPrivilegedAction extends AccessibleElementPrivilegedAction {
private final Object[] args;
private SetConstructorPrivilegedAction(Constructor classConstructor, Object[] args) {
super(classConstructor);
this.args = args;
}
@Override
public T run(Constructor classConstructor) throws InvocationTargetException, InstantiationException, IllegalAccessException {
return (T) classConstructor.newInstance(args);
}
}
private static abstract class AccessibleElementPrivilegedAction implements PrivilegedExceptionAction {
private final E accessible;
protected AccessibleElementPrivilegedAction(E accessible) {
this.accessible = accessible;
}
@Override
public T run() throws Exception {
boolean previous = this.accessible.isAccessible();
accessible.setAccessible(true);
T output = run(accessible);
accessible.setAccessible(previous);
return output;
}
/**
* Execute a Privileged Action against the given element which has been toggled to be accessible.
*
* @param element input AccessibleObject
* @return T
* @throws Exception
*/
public abstract T run(E element) throws Exception;
}
}
