org.apache.bval.util.FieldAccess Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file 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.util;
import java.lang.annotation.ElementType;
import java.lang.reflect.Field;
import java.lang.reflect.Type;
import java.security.AccessController;
import java.security.PrivilegedAction;
/**
* Description: direct field access strategy.
*/
public class FieldAccess extends AccessStrategy {
private final Field field;
/**
* Create a new FieldAccess instance.
* @param field
*/
public FieldAccess(final Field field) {
this.field = field;
if (!field.isAccessible()) {
run(new PrivilegedAction() {
public Void run() {
field.setAccessible(true);
return null;
}
});
}
}
/**
* {@inheritDoc}
*/
public Object get(final Object instance) {
try {
return field.get(instance);
} catch (IllegalAccessException e) {
throw new IllegalArgumentException(e);
}
}
/**
* {@inheritDoc}
*/
public ElementType getElementType() {
return ElementType.FIELD;
}
/**
* {@inheritDoc}
*/
public Type getJavaType() {
return field.getGenericType();
}
/**
* {@inheritDoc}
*/
public String getPropertyName() {
return field.getName();
}
/**
* {@inheritDoc}
*/
public String toString() {
return field.toString();
}
/**
* {@inheritDoc}
*/
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
FieldAccess that = (FieldAccess) o;
return field.equals(that.field);
}
/**
* {@inheritDoc}
*/
public int hashCode() {
return field.hashCode();
}
private static T run(PrivilegedAction action) {
if (System.getSecurityManager() != null) {
return AccessController.doPrivileged(action);
} else {
return action.run();
}
}
}