/**
* This method is a default implementation for the invoke method given in InvocationHandler. Any
* call to a method with a declaring class that is not Object, excluding toString() and default
* methods is redirected to invokeCustom.
*
* <p>Methods like equals and hashcode are called on the class itself instead of the delegate
* because they are considered fundamental methods that should not be overwritten. The toString()
* method gets special treatment as it is deemed to be a method that you might wish to override
* when called from Groovy. Interface default methods from Java 8 on the other hand are considered
* being default implementations you don't normally want to change. So they are called directly
* too
*
* <p>In many scenarios, it is better to overwrite the invokeCustom method where the core Object
* related methods are filtered out.
*
* @param proxy the proxy
* @param method the method
* @param args the arguments
* @return the result of the invocation by method or delegate
* @throws Throwable if caused by the delegate or the method
* @see #invokeCustom(Object, Method, Object[])
* @see InvocationHandler#invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])
*/
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
VMPlugin plugin = VMPluginFactory.getPlugin();
if (plugin.getVersion() >= 7 && isDefaultMethod(method)) {
Object handle = handleCache.get(method);
if (handle == null) {
handle = plugin.getInvokeSpecialHandle(method, proxy);
handleCache.put(method, handle);
}
return plugin.invokeHandle(handle, args);
}
if (!checkMethod(method)) {
try {
if (method.getDeclaringClass() == GroovyObject.class) {
if ("getMetaClass".equals(method.getName())) {
return getMetaClass(proxy);
} else if ("setMetaClass".equals(method.getName())) {
return setMetaClass((MetaClass) args[0]);
}
}
return invokeCustom(proxy, method, args);
} catch (GroovyRuntimeException gre) {
throw ScriptBytecodeAdapter.unwrap(gre);
}
}
try {
return method.invoke(this, args);
} catch (InvocationTargetException ite) {
throw ite.getTargetException();
}
}
public Object callConstructor(Object receiver, Object[] args) throws Throwable {
try {
if (receiver == metaClass.getTheClass()
&& version == classInfo.getVersion()) // metaClass still be valid
return metaClass.invokeConstructor(args);
else return CallSiteArray.defaultCallConstructor(this, receiver, args);
} catch (GroovyRuntimeException gre) {
throw ScriptBytecodeAdapter.unwrap(gre);
}
}
/**
* Asserts that the given code closure fails when it is evaluated and that a particular Exception
* type can be attributed to the cause. The expected exception class is compared recursively with
* any nested exceptions using getCause() until either a match is found or no more nested
* exceptions exist.
*
* <p>If a match is found, the matching exception is returned otherwise the method will fail.
*
* @param expectedCause the class of the expected exception
* @param code the closure that should fail
* @return the cause
*/
public static Throwable shouldFailWithCause(Class expectedCause, Closure code) {
if (expectedCause == null) {
fail("The expectedCause class cannot be null");
}
Throwable cause = null;
Throwable orig = null;
int level = 0;
try {
code.call();
} catch (GroovyRuntimeException gre) {
orig = ScriptBytecodeAdapter.unwrap(gre);
cause = orig.getCause();
} catch (Throwable e) {
orig = e;
cause = orig.getCause();
}
if (orig != null && cause == null) {
fail(
"Closure "
+ code
+ " was expected to fail due to a nested cause of type "
+ expectedCause.getName()
+ " but instead got a direct exception of type "
+ orig.getClass().getName()
+ " with no nested cause(s). Code under test has a bug or perhaps you meant shouldFail?");
}
while (cause != null
&& !expectedCause.isInstance(cause)
&& cause != cause.getCause()
&& level < MAX_NESTED_EXCEPTIONS) {
cause = cause.getCause();
level++;
}
if (orig == null) {
fail(
"Closure "
+ code
+ " should have failed with an exception having a nested cause of type "
+ expectedCause.getName());
} else if (cause == null || !expectedCause.isInstance(cause)) {
fail(
"Closure "
+ code
+ " should have failed with an exception having a nested cause of type "
+ expectedCause.getName()
+ ", instead found these Exceptions:\n"
+ buildExceptionList(orig));
}
return cause;
}
/**
* Asserts that the given code closure fails when it is evaluated
*
* @param code the code expected to fail
* @return the caught exception
*/
public static Throwable shouldFail(Closure code) {
boolean failed = false;
Throwable th = null;
try {
code.call();
} catch (GroovyRuntimeException gre) {
failed = true;
th = ScriptBytecodeAdapter.unwrap(gre);
} catch (Throwable e) {
failed = true;
th = e;
}
assertTrue("Closure " + code + " should have failed", failed);
return th;
}
/**
* Asserts that the given code closure fails when it is evaluated and that a particular type of
* exception is thrown.
*
* @param clazz the class of the expected exception
* @param code the closure that should fail
* @return the caught exception
*/
public static Throwable shouldFail(Class clazz, Closure code) {
Throwable th = null;
try {
code.call();
} catch (GroovyRuntimeException gre) {
th = ScriptBytecodeAdapter.unwrap(gre);
} catch (Throwable e) {
th = e;
}
if (th == null) {
fail("Closure " + code + " should have failed with an exception of type " + clazz.getName());
} else if (!clazz.isInstance(th)) {
fail(
"Closure "
+ code
+ " should have failed with an exception of type "
+ clazz.getName()
+ ", instead got Exception "
+ th);
}
return th;
}