Java PolymorphicDispatcher類代碼示例

import org.eclipse.xtext.util.PolymorphicDispatcher; //導入依賴的package包/類
protected IScope polymorphicFindScopeForReferenceName(EObject context, EReference reference) {
	Predicate<Method> predicate = getPredicate(context, reference);
	PolymorphicDispatcher<IScope> dispatcher = new PolymorphicDispatcher<IScope>(Collections
			.singletonList(this), predicate, errorHandler) {
		@Override
		protected IScope handleNoSuchMethod(Object... params) {
			if (PolymorphicDispatcher.NullErrorHandler.class.equals(errorHandler.getClass()))
				return null;
			return super.handleNoSuchMethod(params);
		}
	};
	EObject current = context;
	IScope scope = null;
	while (scope == null && current != null) {
		scope = dispatcher.invoke(current, reference);
		current = current.eContainer();
	}
	return scope;
}
 

import org.eclipse.xtext.util.PolymorphicDispatcher; //導入依賴的package包/類
protected void invokeMethod(String methodName, ICompletionProposalAcceptor acceptor, Object... params) {
	PolymorphicDispatcher<Void> dispatcher = dispatchers.get(methodName);
	if (dispatcher == null) {
		ErrorHandler<Void> errorHandler = WarningErrorHandler.get(log);
		dispatcher = new PolymorphicDispatcher<Void>(methodName, params.length + 1, params.length + 1,
				Collections.singletonList(this), errorHandler) {
			@Override
			public Class<?> getDefaultClass(int paramIndex) {
				if (paramIndex == 0)
					return EObject.class;
				return super.getDefaultClass(paramIndex);
			}
		};
		dispatchers.put(methodName, dispatcher);
	}
	Object[] paramAsArray = new Object[params.length + 1];
	System.arraycopy(params, 0, paramAsArray, 0, params.length);
	paramAsArray[params.length] = acceptor;
	if (handledArguments.add(Lists.asList(methodName, paramAsArray))) {
		dispatcher.invoke(paramAsArray);
	}
}
 

import org.eclipse.xtext.util.PolymorphicDispatcher; //導入依賴的package包/類
@Override
protected Collection<FollowElement> getFollowElements(AbstractInternalContentAssistParser parser) {
	if (rule == null || rule.eIsProxy())
		return Collections.emptyList();
	String methodName = "entryRule" + rule.getName();
	PolymorphicDispatcher<Collection<FollowElement>> dispatcher = 
		new PolymorphicDispatcher<Collection<FollowElement>>(methodName, 0, 0, Collections.singletonList(parser));
	dispatcher.invoke();
	return parser.getFollowElements();
}
 

import org.eclipse.xtext.util.PolymorphicDispatcher; //導入依賴的package包/類
@Override
public Injector getInjector() {
	if (injector == null) {
		stateBeforeInjectorCreation = GlobalRegistries.makeCopyOfGlobalState();
		try {
			this.injector = internalCreateInjector();

		} catch (Throwable e) {
			// #############################################################################
			// IDE-2514: Temporarily exists on exception due to PolymorphicDispatcher problem
			boolean polymorphicDispatchProblem = false;
			if (e.getMessage().contains("Comparison method violates its general contract!")) {
				String pdName = PolymorphicDispatcher.class.getName();
				for (StackTraceElement ste : e.getStackTrace()) {
					String steName = ste.toString();
					if (steName.contains(pdName)) {
						polymorphicDispatchProblem = true;
					}
				}
			}

			if (polymorphicDispatchProblem) {
				String msg = "Comparison method violates its general contract!\n\t";
				msg += "at org.eclipse.n4js.N4JSInjectorProvider.getInjector(N4JSInjectorProvider.java:90)\\n\\t";
				msg += "Reason might be the PolymorphicDispatcher";
				msg += "Exit.";
				System.err.println(msg);
				System.exit(-1);
			} else {
				throw e;
			}
			// Fail fast End
			// #############################################################################
		}
		stateAfterInjectorCreation = GlobalRegistries.makeCopyOfGlobalState();
	}
	return injector;
}
 

import org.eclipse.xtext.util.PolymorphicDispatcher; //導入依賴的package包/類
protected IScope polymorphicFindScopeForClassName(EObject context, EReference reference) {
	IScope scope = null;
	PolymorphicDispatcher<IScope> dispatcher = new PolymorphicDispatcher<IScope>(
			Collections.singletonList(this), 
			getPredicate(context, reference.getEReferenceType()),
			errorHandler) {
		@Override
		protected IScope handleNoSuchMethod(Object... params) {
			if (PolymorphicDispatcher.NullErrorHandler.class.equals(errorHandler.getClass()))
				return null;
			return super.handleNoSuchMethod(params);
		}
	};
	EObject current = context;
	while (scope == null && current != null) {
		scope = dispatcher.invoke(current, reference);
		current = current.eContainer();
	}
	current = context;
	while (scope == null && current != null) {
		scope = dispatcher.invoke(current, reference.getEReferenceType());
		if (scope!=null)
			logger.warn("scope_<EClass>(EObject,EClass) is deprecated. Use scope_<EClass>(EObject,EReference) instead.");
		current = current.eContainer();
	}
	return scope;
}
 

import org.eclipse.xtext.util.PolymorphicDispatcher; //導入依賴的package包/類
public Object execute(Operation definition, Object[] parameter) {
	PolymorphicDispatcher<Object> dispatcher = new PolymorphicDispatcher<Object>(definition.getName(), definition
			.getParameters().size(), definition.getParameters().size(), callbacks);
	try {
		return dispatcher.invoke(parameter);
	} catch (Exception ex) {
		throw new WrappedException("Error during invocation of operation '" + definition.getName()
				+ "' with params " + definition.getParameters() + " '", ex);
	}
}