org.jemmy.input.awt.ClassReference Maven / Gradle / Ivy
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/*
* Copyright (c) 2007, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package org.jemmy.input.awt;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
/**
*
* Allows access to classes by reflection.
*
* @author Alexandre Iline ([email protected])
*/
public class ClassReference {
private Class cl;
private Object instance;
/**
* Constructor.
* @param o Object to work with.
*/
public ClassReference(Object o) {
super();
instance = o;
cl = o.getClass();
}
/**
* Contructor.
* The object created by this constructor can be used
* to access static methods and fields only.
*
* @param className name of class
* @throws ClassNotFoundException todo document
*/
public ClassReference(String className)
throws ClassNotFoundException {
super();
cl = Class.forName(className);
instance = null;
}
/**
* Executes class's main(java.lang.String[]) method
* with a zero-length java.lang.String array
* as a parameter.
*
* @throws NoSuchMethodException when the method cannot be found.
* @throws InvocationTargetException when the invoked method throws an exception.
*/
public void startApplication()
throws InvocationTargetException, NoSuchMethodException {
String[] params = new String[0];
startApplication(params);
}
/**
* Executes class's main(java.lang.String[]) method.
*
* @param params The java.lang.String array to pass
* to main(java.lang.String[]).
* @throws NoSuchMethodException when the method cannot be found.
* @throws InvocationTargetException when the invoked method throws an exception.
*/
public void startApplication(String[] params)
throws InvocationTargetException, NoSuchMethodException {
String[] real_params;
if (params == null) {
real_params = new String[0];
} else {
real_params = params;
}
String[][] methodParams = {real_params};
Class[] classes = {real_params.getClass()};
try {
invokeMethod("main", methodParams, classes);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
}
}
/**
* Locates method by name and parameter types and executes it.
*
* @param method_name Name of method.
* @param params Method parameters.
* @param params_classes Method parameters types.
* @return the return value from an invocation of the Method.
* If method_name method is void, null is returned.
* If method_name method returns a primitive type, then
* return wrapper class instance.
* @throws InvocationTargetException when the invoked method throws an exception.
* @throws NoSuchMethodException when the method cannot be found.
* @throws IllegalAccessException when access to the class or method is lacking.
* @throws SecurityException if access to the package or method is denied.
*/
public Object invokeMethod(String method_name, Object[] params, Class[] params_classes)
throws InvocationTargetException, NoSuchMethodException, IllegalAccessException {
if (params == null) {
params = new Object[0];
}
if (params_classes == null) {
params_classes = new Class[0];
}
Method method = cl.getMethod(method_name,
params_classes);
return (method.invoke(instance, params));
}
/**
* Locates constructor by parameter types and creates an instance.
*
* @param params An array of Method parameters.
* @param params_classes An array of Method parameter types.
* @return a new class instance.
* @throws InvocationTargetException when the invoked constructor throws an exception.
* @throws NoSuchMethodException when the constructor cannot be found.
* @throws IllegalAccessException when access to the class or constructor is lacking.
* @throws InstantiationException when the constructor is for an abstract class.
* @throws SecurityException if access to the package or constructor is denied.
*/
public Object newInstance(Object[] params, Class[] params_classes)
throws InvocationTargetException, NoSuchMethodException,
IllegalAccessException, InstantiationException {
if (params == null) {
params = new Object[0];
}
if (params_classes == null) {
params_classes = new Class[0];
}
Constructor constructor = cl.getConstructor(params_classes);
return (constructor.newInstance(params));
}
/**
* Returns the field value.
* @param field_name The name of the field.
* @return the field value
* @see #setField
* @throws NoSuchFieldException when the field cannot be found.
* @throws IllegalAccessException when access to the class or constructor is lacking.
* @throws SecurityException if access to the package or field is denied.
*/
public Object getField(String field_name)
throws NoSuchFieldException, IllegalAccessException {
return (cl.getField(field_name).get(instance));
}
/**
* Change a field's value.
*
* @param field_name The name of the field.
* @param newValue The fields new value.
* @see #getField
* @throws NoSuchFieldException when the field cannot be found.
* @throws IllegalAccessException when access to the class or constructor is lacking.
* @throws SecurityException if access to the package or field is denied.
*/
public void setField(String field_name, Object newValue)
throws NoSuchFieldException, IllegalAccessException {
cl.getField(field_name).set(instance, newValue);
}
/**
* Returns all superclasses.
* @return an array of superclasses, starting with the reference class
* and ending with java.lang.Object.
*/
public Class[] getClasses() {
Class cls = cl;
int count = 0;
do {
count++;
cls = cls.getSuperclass();
} while (cls != null);
Class[] result = new Class[count];
cls = cl;
for (int i = 0; i < count; i++) {
result[i] = cls;
cls = cls.getSuperclass();
}
return (result);
}
}
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