org.apache.bval.util.MethodAccess 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.beans.Introspector;
import java.lang.annotation.ElementType;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.security.AccessController;
import java.security.PrivilegedAction;
/**
* Description: invoke a zero-argument method (getter)
*/
public class MethodAccess extends AccessStrategy {
private final Method method;
private final String propertyName;
/**
* Create a new MethodAccess instance.
* @param method
*/
public MethodAccess(Method method) {
this(getPropertyName(method), method);
}
/**
* Create a new MethodAccess instance.
* @param propertyName
* @param method
*/
public MethodAccess(String propertyName, final Method method) {
this.method = method;
this.propertyName = propertyName;
if (!method.isAccessible()) {
run( new PrivilegedAction() {
public Void run() {
method.setAccessible(true);
return null;
}
});
}
}
/**
* Process bean properties getter by applying the JavaBean naming conventions.
*
* @param member the member for which to get the property name.
* @return The bean method name with the "is" or "get" prefix stripped off, null
* the method name id not according to the JavaBeans standard.
*/
public static String getPropertyName(Method member) {
String name = null;
String methodName = member.getName();
if (methodName.startsWith("is")) {
name = Introspector.decapitalize(methodName.substring(2));
} /* else if ( methodName.startsWith("has")) {
name = Introspector.decapitalize( methodName.substring( 3 ) );
} */
// setter annotation is NOT supported in the spec
/* else if (method.getName().startsWith("set") && method.getParameterTypes().length == 1) {
propName = Introspector.decapitalize(method.getName().substring(3));
} */
else if (methodName.startsWith("get")) {
name = Introspector.decapitalize(methodName.substring(3));
}
return name;
}
/**
* {@inheritDoc}
* normally the propertyName of the getter method, e.g.
* method: getName() -> propertyName: name
* method: isValid() -> propertyName: valid
*/
public String getPropertyName() {
return propertyName;
}
/**
* {@inheritDoc}
*/
public Object get(final Object instance) {
try {
return method.invoke(instance);
} catch (IllegalAccessException e) {
throw new IllegalArgumentException(e);
} catch (InvocationTargetException e) {
throw new IllegalArgumentException(e);
}
}
/**
* {@inheritDoc}
*/
public ElementType getElementType() {
return ElementType.METHOD;
}
/**
* {@inheritDoc}
*/
public Type getJavaType() {
return method.getGenericReturnType();
}
/**
* {@inheritDoc}
*/
public String toString() {
return method.toString();
}
/**
* {@inheritDoc}
*/
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
MethodAccess that = (MethodAccess) o;
return method.equals(that.method);
}
/**
* {@inheritDoc}
*/
public int hashCode() {
return method.hashCode();
}
private static T run(PrivilegedAction action) {
if (System.getSecurityManager() != null) {
return AccessController.doPrivileged(action);
} else {
return action.run();
}
}
}