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/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* Licensed 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 com.artemis.utils.reflect;
import java.lang.reflect.Modifier;
/** Utilities for Class reflection.
* @author nexsoftware */
@SuppressWarnings({"unchecked", "rawtypes"})
public final class ClassReflection {
/** Returns the Class object associated with the class or interface with the supplied string name. */
static public Class forName (String name) throws ReflectionException {
try {
return Class.forName(name);
} catch (ClassNotFoundException e) {
throw new ReflectionException("Class not found: " + name, e);
}
}
/** Returns the simple name of the underlying class as supplied in the source code. */
static public String getSimpleName (Class c) {
return c.getSimpleName();
}
/** Determines if the supplied Object is assignment-compatible with the object represented by supplied Class. */
static public boolean isInstance (Class c, Object obj) {
return c.isInstance(obj);
}
/** Determines if the class or interface represented by first Class parameter is either the same as, or is a superclass or
* superinterface of, the class or interface represented by the second Class parameter. */
static public boolean isAssignableFrom (Class c1, Class c2) {
return c1.isAssignableFrom(c2);
}
/** Returns true if the class or interface represented by the supplied Class is a member class. */
static public boolean isMemberClass (Class c) {
return c.isMemberClass();
}
/** Returns true if the class or interface represented by the supplied Class is a static class. */
static public boolean isStaticClass (Class c) {
return Modifier.isStatic(c.getModifiers());
}
/** Creates a new instance of the class represented by the supplied Class. */
static public T newInstance (Class c) throws ReflectionException {
try {
return c.newInstance();
} catch (InstantiationException e) {
String help = ". Make sure class has a public no-arg constructor.";
throw new ReflectionException("Could not instantiate instance of class: " + c.getName() + help, e);
} catch (IllegalAccessException e) {
String help = ". Make sure class has a public no-arg constructor.";
throw new ReflectionException("Could not instantiate instance of class: " + c.getName() + help, e);
}
}
/** Returns an array of {@link Constructor} containing the public constructors of the class represented by the supplied Class. */
static public Constructor[] getConstructors (Class c) {
java.lang.reflect.Constructor[] constructors = c.getConstructors();
Constructor[] result = new Constructor[constructors.length];
for (int i = 0, j = constructors.length; i < j; i++) {
result[i] = new Constructor(constructors[i]);
}
return result;
}
/** Returns a {@link Constructor} that represents the public constructor for the supplied class which takes the supplied parameter types. */
static public Constructor getConstructor (Class c, Class... parameterTypes) throws ReflectionException {
try {
return new Constructor(c.getConstructor(parameterTypes));
} catch (SecurityException e) {
throw new ReflectionException("Security violation occurred while getting constructor for class: '" + c.getName() + "'.", e);
} catch (NoSuchMethodException e) {
throw new ReflectionException("Constructor not found for class: " + c.getName(), e);
}
}
/** Returns a {@link Constructor} that represents the constructor for the supplied class which takes the supplied parameter types. */
static public Constructor getDeclaredConstructor (Class c, Class... parameterTypes) throws ReflectionException {
try {
return new Constructor(c.getDeclaredConstructor(parameterTypes));
} catch (SecurityException e) {
throw new ReflectionException("Security violation while getting constructor for class: " + c.getName(), e);
} catch (NoSuchMethodException e) {
throw new ReflectionException("Constructor not found for class: " + c.getName(), e);
}
}
/** Returns an array of {@link Method} containing the public member methods of the class represented by the supplied Class. */
static public Method[] getMethods (Class c) {
java.lang.reflect.Method[] methods = c.getMethods();
Method[] result = new Method[methods.length];
for (int i = 0, j = methods.length; i < j; i++) {
result[i] = new Method(methods[i]);
}
return result;
}
/** Returns a {@link Method} that represents the public member method for the supplied class which takes the supplied parameter types. */
static public Method getMethod (Class c, String name, Class... parameterTypes) throws ReflectionException {
try {
return new Method(c.getMethod(name, parameterTypes));
} catch (SecurityException e) {
throw new ReflectionException("Security violation while getting method: " + name + ", for class: " + c.getName(), e);
} catch (NoSuchMethodException e) {
throw new ReflectionException("Method not found: " + name + ", for class: " + c.getName(), e);
}
}
/** Returns an array of {@link Method} containing the methods declared by the class represented by the supplied Class. */
static public Method[] getDeclaredMethods (Class c) {
java.lang.reflect.Method[] methods = c.getDeclaredMethods();
Method[] result = new Method[methods.length];
for (int i = 0, j = methods.length; i < j; i++) {
result[i] = new Method(methods[i]);
}
return result;
}
/** Returns a {@link Method} that represents the method declared by the supplied class which takes the supplied parameter types. */
static public Method getDeclaredMethod (Class c, String name, Class... parameterTypes) throws ReflectionException {
try {
return new Method(c.getDeclaredMethod(name, parameterTypes));
} catch (SecurityException e) {
throw new ReflectionException("Security violation while getting method: " + name + ", for class: " + c.getName(), e);
} catch (NoSuchMethodException e) {
throw new ReflectionException("Method not found: " + name + ", for class: " + c.getName(), e);
}
}
/** Returns an array of {@link Field} containing the public fields of the class represented by the supplied Class. */
static public Field[] getFields (Class c) {
java.lang.reflect.Field[] fields = c.getFields();
Field[] result = new Field[fields.length];
for (int i = 0, j = fields.length; i < j; i++) {
result[i] = new Field(fields[i]);
}
return result;
}
/** Returns a {@link Field} that represents the specified public member field for the supplied class. */
static public Field getField (Class c, String name) throws ReflectionException {
try {
return new Field(c.getField(name));
} catch (SecurityException e) {
throw new ReflectionException("Security violation while getting field: " + name + ", for class: " + c.getName(), e);
} catch (NoSuchFieldException e) {
throw new ReflectionException("Field not found: " + name + ", for class: " + c.getName(), e);
}
}
/** Returns an array of {@link Field} objects reflecting all the fields declared by the supplied class. */
static public Field[] getDeclaredFields (Class c) {
java.lang.reflect.Field[] fields = c.getDeclaredFields();
Field[] result = new Field[fields.length];
for (int i = 0, j = fields.length; i < j; i++) {
result[i] = new Field(fields[i]);
}
return result;
}
/** Creates a new instance of the annotation represented by the supplied annotationClass.
*/
static public T getAnnotation(Class c, Class annotationClass) throws ReflectionException {
final Annotation declaredAnnotation = getDeclaredAnnotation(c,annotationClass);
return declaredAnnotation != null ? declaredAnnotation.getAnnotation(annotationClass) : null;
}
/** Returns a {@link Field} that represents the specified declared field for the supplied class. */
static public Field getDeclaredField (Class c, String name) throws ReflectionException {
try {
return new Field(c.getDeclaredField(name));
} catch (SecurityException e) {
throw new ReflectionException("Security violation while getting field: " + name + ", for class: " + c.getName(), e);
} catch (NoSuchFieldException e) {
throw new ReflectionException("Field not found: " + name + ", for class: " + c.getName(), e);
}
}
/** Returns true if the supplied class includes an annotation of the given class type. */
static public boolean isAnnotationPresent (Class c, Class annotationType) {
return c.isAnnotationPresent(annotationType);
}
/** Returns an array of {@link Annotation} objects reflecting all annotations declared by the supplied class,
* or an empty array if there are none. Does not include inherited annotations. */
static public Annotation[] getDeclaredAnnotations (Class c) {
java.lang.annotation.Annotation[] annotations = c.getDeclaredAnnotations();
Annotation[] result = new Annotation[annotations.length];
for (int i = 0; i < annotations.length; i++) {
result[i] = new Annotation(annotations[i]);
}
return result;
}
/** Returns an {@link Annotation} object reflecting the annotation provided, or null of this field doesn't
* have such an annotation. This is a convenience function if the caller knows already which annotation
* type he's looking for. */
static public Annotation getDeclaredAnnotation (Class c, Class annotationType) {
java.lang.annotation.Annotation[] annotations = c.getDeclaredAnnotations();
for (java.lang.annotation.Annotation annotation : annotations) {
if (annotation.annotationType().equals(annotationType)) {
return new Annotation(annotation);
}
}
return null;
}
}
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