org.identityconnectors.common.ReflectionUtil Maven / Gradle / Ivy
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/*
* ====================
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 2008-2009 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of the Common Development
* and Distribution License("CDDL") (the "License"). You may not use this file
* except in compliance with the License.
*
* You can obtain a copy of the License at
* http://IdentityConnectors.dev.java.net/legal/license.txt
* See the License for the specific language governing permissions and limitations
* under the License.
*
* When distributing the Covered Code, include this CDDL Header Notice in each file
* and include the License file at identityconnectors/legal/license.txt.
* If applicable, add the following below this CDDL Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyrighted [year] [name of copyright owner]"
* ====================
*/
package org.identityconnectors.common;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
public class ReflectionUtil {
/**
* Never allow this to be instantiated.
*/
private ReflectionUtil() {
throw new AssertionError();
}
/**
* Builds a {@link Set} of interfaces from the target class.
*/
public static Set> getAllInterfaces(final Class target) {
assert target != null;
Set> ret = new HashSet>();
getAllInteralInterfaces(target, ret);
return ret;
}
private static void getAllInteralInterfaces(final Class target,
final Set> result) {
// quick exit if target is null..
if (target != null) {
// get all the interfaces of the target class..
for (Class inter : target.getInterfaces()) {
result.add(inter);
}
// get all the interfaces of the super class..
getAllInteralInterfaces(target.getSuperclass(), result);
}
}
/**
* Determine if the target class implements the provided interface.
*
* @param target
* class to look through for a matching interface.
* @param clazz
* interface class to look for.
* @return true if a matching interface is found otherwise false.
*/
public static boolean containsInterface(final Class target,
final Class clazz) {
return clazz.isAssignableFrom(target);
}
/**
* Get all interfaces the extends the type provided.
*/
public static List> getInterfaces(
final Class target, final Class type) {
List> ret = new ArrayList>();
Collection> interfs = getAllInterfaces(target);
for (Class clazz : interfs) {
if (containsInterface(clazz, type)) {
@SuppressWarnings("unchecked")
Class o = (Class) clazz;
ret.add(o);
}
}
return ret;
}
/**
* Returns true iff the given class overrides equals and hashCode
* @param clazz The class to check.
* @return True iff the given class overrides equals and hashCode
*/
public static boolean overridesEqualsAndHashcode(Class clazz) {
try {
Method equals = clazz.getMethod("equals", Object.class);
if (equals.getDeclaringClass() == Object.class) {
return false;
}
Method hashCode = clazz.getMethod("hashCode");
if (hashCode.getDeclaringClass() == Object.class) {
return false;
}
return true;
}
catch (RuntimeException e) {
throw e;
}
catch (Exception e) {
//this should never happen
throw new RuntimeException(e);
}
}
/**
* Returns the package the class is associated with.
*
* @param clazz
* class to inspect for the package.
* @return package for the class provided.
* @throws NullPointerException
* iff clazz is null.
*/
public static String getPackage(Class clazz) {
String name = clazz.getName();
return name.substring(0, name.lastIndexOf('.'));
}
/**
* Determine the method name for the calling class.
*/
public static String getMethodName(int depth) {
// Hack (?) to get the stack trace.
Throwable dummyException = new Throwable();
StackTraceElement locations[] = dummyException.getStackTrace();
// caller will be the depth element
String method = "unknown";
if (locations != null && locations.length > depth) {
StackTraceElement caller = locations[depth];
method = caller.getMethodName();
}
return method;
}
}