/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at
* trunk/opends/resource/legal-notices/OpenDS.LICENSE
* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at
* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
* add the following below this CDDL HEADER, with the fields enclosed
* by brackets "[]" replaced with your own identifying information:
* Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*
*
* Copyright 2008 Sun Microsystems, Inc.
*/
package org.opends.server.admin;
import static org.opends.server.util.Validator.ensureNotNull;
import java.util.Collections;
import java.util.EnumSet;
import java.util.LinkedList;
import java.util.List;
/**
* Class property definition.
* <p>
* A class property definition defines a property whose values
* represent a Java class. It is possible to restrict the type of java
* class by specifying "instance of" constraints.
* <p>
* Note that in a client/server environment, the client is probably
* not capable of validating the Java class (e.g. it will not be able
* to load it nor have access to the interfaces it is supposed to
* implement). For this reason, it is possible to switch off
* validation in the client by calling the static method
* {@link #setAllowClassValidation(boolean)}.
*/
public final class ClassPropertyDefinition extends PropertyDefinition<String> {
/**
* An interface for incrementally constructing class property
* definitions.
*/
public static class Builder extends
AbstractBuilder<String, ClassPropertyDefinition> {
// List of interfaces which property values must implement.
private List<String> instanceOfInterfaces;
// Private constructor
private Builder(
AbstractManagedObjectDefinition<?, ?> d, String propertyName) {
super(d, propertyName);
this.instanceOfInterfaces = new LinkedList<String>();
}
/**
* Add an class name which property values must implement.
*
* @param className
* The name of a class which property values must
* implement.
*/
public final void addInstanceOf(String className) {
ensureNotNull(className);
// Do some basic checks to make sure the string representation
// is valid.
String value = className.trim();
if (!value.matches(CLASS_RE)) {
throw new IllegalArgumentException("\"" + value
+ "\" is not a valid Java class name");
}
// If possible try and load the class in order to perform
// additional
// validation.
if (isAllowClassValidation()) {
// Check that the class can be loaded so that validation can
// be
// performed.
try {
loadClass(value);
} catch (ClassNotFoundException e) {
// TODO: can we do something better here?
throw new RuntimeException(e);
}
}
instanceOfInterfaces.add(value);
}
/**
* {@inheritDoc}
*/
@Override
protected ClassPropertyDefinition buildInstance(
AbstractManagedObjectDefinition<?, ?> d,
String propertyName, EnumSet<PropertyOption> options,
AdministratorAction adminAction,
DefaultBehaviorProvider<String> defaultBehavior) {
return new ClassPropertyDefinition(d, propertyName, options,
adminAction, defaultBehavior, instanceOfInterfaces);
}
}
// Regular expression for validating class names.
private static final String CLASS_RE =
"^([A-Za-z][A-Za-z0-9_]*\\.)*[A-Za-z][A-Za-z0-9_]*(\\$[A-Za-z0-9_]+)*$";
// Flag indicating whether class property values should be
// validated.
private static boolean allowClassValidation = true;
/**
* Create a class property definition builder.
*
* @param d
* The managed object definition associated with this
* property definition.
* @param propertyName
* The property name.
* @return Returns the new class property definition builder.
*/
public static Builder createBuilder(
AbstractManagedObjectDefinition<?, ?> d, String propertyName) {
return new Builder(d, propertyName);
}
/**
* Determine whether or not class property definitions should
* validate class name property values. Validation involves checking
* that the class exists and that it implements the required
* interfaces.
*
* @return Returns <code>true</code> if class property definitions
* should validate class name property values.
*/
public static boolean isAllowClassValidation() {
return allowClassValidation;
}
/**
* Specify whether or not class property definitions should validate
* class name property values. Validation involves checking that the
* class exists and that it implements the required interfaces.
* <p>
* By default validation is switched on.
*
* @param value
* <code>true</code> if class property definitions should
* validate class name property values.
*/
public static void setAllowClassValidation(boolean value) {
allowClassValidation = value;
}
// Load a named class.
private static Class<?> loadClass(String className)
throws ClassNotFoundException, LinkageError {
return Class.forName(className, true, ClassLoaderProvider
.getInstance().getClassLoader());
}
// List of interfaces which property values must implement.
private final List<String> instanceOfInterfaces;
// Private constructor.
private ClassPropertyDefinition(
AbstractManagedObjectDefinition<?, ?> d, String propertyName,
EnumSet<PropertyOption> options,
AdministratorAction adminAction,
DefaultBehaviorProvider<String> defaultBehavior,
List<String> instanceOfInterfaces) {
super(d, String.class, propertyName, options, adminAction, defaultBehavior);
this.instanceOfInterfaces = Collections
.unmodifiableList(new LinkedList<String>(instanceOfInterfaces));
}
/**
* {@inheritDoc}
*/
@Override
public <R, P> R accept(PropertyDefinitionVisitor<R, P> v, P p) {
return v.visitClass(this, p);
}
/**
* {@inheritDoc}
*/
@Override
public <R, P> R accept(PropertyValueVisitor<R, P> v, String value, P p) {
return v.visitClass(this, value, p);
}
/**
* {@inheritDoc}
*/
@Override
public String decodeValue(String value)
throws IllegalPropertyValueStringException {
ensureNotNull(value);
try {
validateValue(value);
} catch (IllegalPropertyValueException e) {
throw new IllegalPropertyValueStringException(this, value);
}
return value;
}
/**
* Get an unmodifiable list of classes which values of this property
* must implement.
*
* @return Returns an unmodifiable list of classes which values of
* this property must implement.
*/
public List<String> getInstanceOfInterface() {
return instanceOfInterfaces;
}
/**
* Validate and load the named class, and cast it to a subclass of
* the specified class.
*
* @param <T>
* The requested type.
* @param className
* The name of the class to validate and load.
* @param instanceOf
* The class representing the requested type.
* @return Returns the named class cast to a subclass of the
* specified class.
* @throws IllegalPropertyValueException
* If the named class was invalid, could not be loaded, or
* did not implement the required interfaces.
* @throws ClassCastException
* If the referenced class does not implement the
* requested type.
*/
public <T> Class<? extends T> loadClass(String className,
Class<T> instanceOf) throws IllegalPropertyValueException,
ClassCastException {
ensureNotNull(className, instanceOf);
// Make sure that the named class is valid.
validateClassName(className);
Class<?> theClass = validateClassInterfaces(className);
// Cast it to the required type.
return theClass.asSubclass(instanceOf);
}
/**
* {@inheritDoc}
*/
@Override
public String normalizeValue(String value)
throws IllegalPropertyValueException {
ensureNotNull(value);
return value.trim();
}
/**
* {@inheritDoc}
*/
@Override
public void validateValue(String value)
throws IllegalPropertyValueException {
ensureNotNull(value);
// Always make sure the name is a valid class name.
validateClassName(value);
// If additional validation is enabled then attempt to load the
// class and
// check the interfaces that it implements/extends.
if (allowClassValidation) {
validateClassInterfaces(value);
}
}
// Make sure that named class implements the interfaces named by
// this
// definition.
private Class<?> validateClassInterfaces(String className)
throws IllegalPropertyValueException {
String nvalue = className.trim();
Class<?> theClass;
try {
theClass = loadClass(nvalue);
} catch (Exception e) {
// If the class cannot be loaded then it is an invalid value.
throw new IllegalPropertyValueException(this, className);
}
for (String i : instanceOfInterfaces) {
try {
Class<?> instanceOfClass = loadClass(i);
if (!instanceOfClass.isAssignableFrom(theClass)) {
throw new IllegalPropertyValueException(this, className);
}
} catch (Exception e) {
// Should not happen because the class was validated when the
// property
// definition was constructed.
throw new IllegalPropertyValueException(this, className);
}
}
return theClass;
}
// Do some basic checks to make sure the string representation is
// valid.
private void validateClassName(String className)
throws IllegalPropertyValueException {
String nvalue = className.trim();
if (!nvalue.matches(CLASS_RE)) {
throw new IllegalPropertyValueException(this, className);
}
}
}