org.apache.bval.jsr303.util.SecureActions Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.bval.jsr303.util;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.security.PrivilegedAction;
import javax.validation.ValidatorFactory;
import org.apache.bval.jsr303.ConfigurationImpl;
import org.apache.bval.util.PrivilegedActions;
/**
* Description: utility methods to perform actions with AccessController or without.
*/
public class SecureActions extends PrivilegedActions {
/**
* Create a privileged action to get the context classloader of the current thread.
*
* @see Thread#getContextClassLoader()
*/
public static PrivilegedAction getContextClassLoader()
{
return SecureActions.GetContextClassLoader.instance;
}
/**
* Create a privileged action to get the named field declared by the specified class.
* The result of the action will be {@code null} if there is no such field.
*/
public static PrivilegedAction getDeclaredField(final Class clazz, final String fieldName) {
return new PrivilegedAction() {
public Field run() {
try {
final Field f = clazz.getDeclaredField(fieldName);
setAccessibility(f);
return f;
} catch (final NoSuchFieldException ex) {
return null;
}
}
};
}
/**
* Create a privileged action to get all fields declared by the specified class.
*/
public static PrivilegedAction getDeclaredFields(final Class clazz) {
return new PrivilegedAction() {
public Field[] run() {
final Field[] fields = clazz.getDeclaredFields();
if (fields.length > 0)
AccessibleObject.setAccessible(fields, true);
return fields;
}
};
}
/**
* Create a privileged action to get all methods declared by the specified class.
*/
public static PrivilegedAction getDeclaredMethods(final Class clazz) {
// XXX 2011-03-27 jw: Inconsistent behaviour.
// doGetDeclaredFields() is setting fields accessible, but here we don't.
return new PrivilegedAction() {
public Method[] run() {
return clazz.getDeclaredMethods();
}
};
}
/**
* Create a privileged action to get the named method declared by the specified class
* or by one of its ancestors.
* The result of the action will be {@code null} if there is no such method.
*/
public static PrivilegedAction getPublicMethod(final Class clazz, final String methodName) {
return new PrivilegedAction() {
public Method run() {
try {
return clazz.getMethod(methodName, (Class[]) null);
} catch (final NoSuchMethodException ex) {
return null;
}
}
};
}
private static void setAccessibility(Field field) {
// FIXME 2011-03-27 jw:
// - Why not simply call field.setAccessible(true)?
// - Fields can not be abstract.
if (!Modifier.isPublic(field.getModifiers()) || (
Modifier.isPublic(field.getModifiers()) &&
Modifier.isAbstract(field.getModifiers()))) {
field.setAccessible(true);
}
}
/**
* Create a privileged action for ConfigurationImpl.buildValidatorFactory.
*/
public static PrivilegedAction doPrivBuildValidatorFactory(final ConfigurationImpl config) {
return new PrivilegedAction() {
public ValidatorFactory run() {
return config.doPrivBuildValidatorFactory();
}
};
}
private static final class GetContextClassLoader extends Object implements PrivilegedAction {
static final GetContextClassLoader instance = new GetContextClassLoader();
private GetContextClassLoader()
{
super();
}
public final ClassLoader run() {
return Thread.currentThread().getContextClassLoader();
}
}
}