org.arquillian.spacelift.Invokable Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of arquillian-spacelift-api Show documentation
Show all versions of arquillian-spacelift-api Show documentation
Arquillian Process and Package Manager
/*
* JBoss, Home of Professional Open Source
* Copyright 2012, Red Hat Middleware LLC, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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 org.arquillian.spacelift;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.MessageFormat;
/**
* Represents a wrapper on top of Java Reflection API. It makes indirect execution much easier
*
* @author Karel Piwko
*/
class Invokable {
private final Class classType;
/**
* Creates a new instance of Invokable. Class itself is loaded by provided classloader
*
* @param cl
* classloader
* @param className
* fully qualified class name
*/
Invokable(ClassLoader cl, String className) {
this.classType = loadClass(cl, className);
}
/**
* Creates a new instance of Invokable. Class itself is reloaded by provider classloader
*
* @param cl
* classloader
* @param classType
* class object. Class with the same fully qualified name will be loader from provided classloader
*/
Invokable(ClassLoader cl, Class classType) {
this.classType = reloadClass(cl, classType);
}
/**
* Loads a class from classloader
*
* @param cl
* classloader to be used
* @param classTypeName
* fully qualified class name
*
* @throws InvocationException
* if class was not found in classloader
*/
static Class loadClass(ClassLoader cl, String classTypeName) throws InvocationException {
try {
return cl.loadClass(classTypeName);
} catch (ClassNotFoundException e) {
throw new InvocationException(e, "Unable to load class {0} with class loader {1}", classTypeName, cl);
}
}
/**
* Reloads a class from classloader using same fully qualified class name
*
* @param cl
* classloader to be used
* @param classType
* class object
*
* @throws InvocationException
* if class was not found in classloader
*/
static Class reloadClass(ClassLoader cl, Class classType) throws InvocationException {
try {
return cl.loadClass(classType.getName());
} catch (ClassNotFoundException e) {
throw new InvocationException(e,
"Unable to reload class {0} with class loader {1}, previously loaded with {2}",
classType.getName(), cl, classType.getClassLoader());
}
}
/**
* Invokes method on class registered within {@link Invokable}. It looks also for superclasses
*
* @param name
* name of the method
* @param parameterTypes
* parameter types of the method
* @param instance
* instance on which method is called, {@code null} for static methods
* @param parameters
* parameters for method invocation
*
* @throws InvocationException
* if method was not found or could not be invoked
*/
Object invokeMethod(String name, Class[] parameterTypes, Object instance, Object[] parameters)
throws InvocationException {
try {
return findMethod(name, parameterTypes).invoke(instance, parameters);
} catch (IllegalAccessException e) {
throw new InvocationException(e, "Unable to invoke {0}({1}) on object {2} with parameters {3}", name,
parameterTypes, instance == null ? "" : instance.getClass().getName(), parameters);
} catch (IllegalArgumentException e) {
throw new InvocationException(e, "Unable to invoke {0}({1}) on object {2} with parameters {3}", name,
parameterTypes, instance == null ? "" : instance.getClass().getName(), parameters);
} catch (InvocationTargetException e) {
throw new InvocationException(e, "Unable to invoke {0}({1}) on object {2} with parameters {3}", name,
parameterTypes, instance == null ? "" : instance.getClass().getName(), parameters);
} catch (SecurityException e) {
throw new InvocationException(e, "Unable to invoke {0}({1}) on object {2} with parameters {3}", name,
parameterTypes, instance == null ? "" : instance.getClass().getName(), parameters);
} catch (InvocationException e) {
throw new InvocationException(e, "Unable to invoke {0}({1}) on object {2} with parameters {3}", name,
parameterTypes, instance == null ? "" : instance.getClass().getName(), parameters);
}
}
/**
* Creates a new instance of the class registered within {@link Invokable}.
*
* @param parameterTypes
* parameter types of constructor
* @param parameters
* parameter values
*
* @return new instance
*
* @throws InvocationException
* If constructor was not found or could not be invoked
*/
Object invokeConstructor(Class[] parameterTypes, Object[] parameters) throws InvocationException {
try {
Constructor con = classType.getConstructor(parameterTypes);
return con.newInstance(parameters);
} catch (NoSuchMethodException e) {
throw new InvocationException(e, "Unable to invoke constructor {0}({1}) with parameters {2}",
classType.getSimpleName(),
parameterTypes, parameters);
} catch (SecurityException e) {
throw new InvocationException(e, "Unable to invoke constructor {0}({1}) with parameters {2}",
classType.getSimpleName(),
parameterTypes, parameters);
} catch (InstantiationException e) {
throw new InvocationException(e, "Unable to invoke constructor {0}({1}) with parameters {2}",
classType.getSimpleName(),
parameterTypes, parameters);
} catch (IllegalAccessException e) {
throw new InvocationException(e, "Unable to invoke constructor {0}({1}) with parameters {2}",
classType.getSimpleName(),
parameterTypes, parameters);
} catch (IllegalArgumentException e) {
throw new InvocationException(e, "Unable to invoke constructor {0}({1}) with parameters {2}",
classType.getSimpleName(),
parameterTypes, parameters);
} catch (InvocationTargetException e) {
throw new InvocationException(e, "Unable to invoke constructor {0}({1}) with parameters {2}",
classType.getSimpleName(),
parameterTypes, parameters);
}
}
private Method findMethod(String name, Class[] parameterTypes) throws SecurityException, InvocationException {
Method m = null;
try {
m = classType.getDeclaredMethod(name, parameterTypes);
m.setAccessible(true);
return m;
} catch (NoSuchMethodException e) {
// ignore
}
// look for parent classes
Class iterator = classType.getSuperclass();
while (iterator != null) {
try {
m = iterator.getDeclaredMethod(name, parameterTypes);
m.setAccessible(true);
return m;
} catch (NoSuchMethodException e) {
// ignore, try parent
iterator = iterator.getSuperclass();
}
}
throw new InvocationException(
"Unable to find method {0}({1}) in class {2} nor its superclasses or implemented interfaces", name,
parameterTypes, classType.getName());
}
/**
* Represents an invocation exception that can happen during reflection calls
*
* @author Karel Piwko
*/
static class InvocationException extends RuntimeException {
private static final long serialVersionUID = 1L;
InvocationException(Throwable e) {
super(e);
}
InvocationException(Throwable e, String pattern, Object... args) {
super(MessageFormat.format(pattern, args), e);
}
InvocationException(String pattern, Object... args) {
super(MessageFormat.format(pattern, args));
}
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy