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Merge pull request #873 from csokol/catching-interceptors-validation-…
…errors Handling ValidationExceptions in interceptors
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86 changes: 86 additions & 0 deletions
86
vraptor-core/src/main/java/br/com/caelum/vraptor/core/Try.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| package br.com.caelum.vraptor.core; | ||
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| import java.util.concurrent.Callable; | ||
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| /** | ||
| * A class to wrap code that can possibly throw exceptions. | ||
| * | ||
| * Use the static method Try#run to instantiate this class, passing down | ||
| * the dangerous code and use its methods to retrieve the result or the exception | ||
| * of your computation. Example using java 8: | ||
| * | ||
| * <code> | ||
| * Try try = Try.run(() -> someDangerousMethod()); | ||
| * if (try.failed()) { | ||
| * Exception e = try.getException(); | ||
| * handleError(e); | ||
| * } | ||
| * try.result(); //do something with the result | ||
| * </code> | ||
| * | ||
| * @author Chico Sokol | ||
| * @param <T> the type of the result of your computation | ||
| */ | ||
| public abstract class Try<T> { | ||
| public static <T> Try run(Callable<T> callable) { | ||
| try { | ||
| T call = callable.call(); | ||
| return new Success(call); | ||
| } catch (Exception e) { | ||
| return new Failed(e); | ||
| } | ||
| } | ||
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| public abstract boolean failed(); | ||
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| public abstract T result(); | ||
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| public abstract Exception getException(); | ||
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| public static class Success<T> extends Try { | ||
| private final T result; | ||
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| private Success(T result) { | ||
| this.result = result; | ||
| } | ||
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| @Override | ||
| public boolean failed() { | ||
| return false; | ||
| } | ||
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| @Override | ||
| public Object result() { | ||
| return result; | ||
| } | ||
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| @Override | ||
| public Exception getException() { | ||
| throw new UnsupportedOperationException("A Success doesn't have an exception."); | ||
| } | ||
| } | ||
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| public static class Failed<T> extends Try { | ||
| private final Exception e; | ||
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| private Failed(Exception e) { | ||
| this.e = e; | ||
| } | ||
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| @Override | ||
| public boolean failed() { | ||
| return true; | ||
| } | ||
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| @Override | ||
| public Object result() { | ||
| throw new UnsupportedOperationException("A Failed doesn't have a result."); | ||
| } | ||
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| @Override | ||
| public Exception getException() { | ||
| return e; | ||
| } | ||
| } | ||
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| } |
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39 changes: 39 additions & 0 deletions
39
vraptor-core/src/main/java/br/com/caelum/vraptor/observer/ExecuteMethodExceptionHandler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| package br.com.caelum.vraptor.observer; | ||
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| import br.com.caelum.vraptor.InterceptionException; | ||
| import br.com.caelum.vraptor.core.ReflectionProviderException; | ||
| import br.com.caelum.vraptor.interceptor.ApplicationLogicException; | ||
| import br.com.caelum.vraptor.validator.ValidationException; | ||
| import org.slf4j.Logger; | ||
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| import static org.slf4j.LoggerFactory.getLogger; | ||
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| /** | ||
| * Handles exceptions thrown by a controller method | ||
| * | ||
| * @author Chico Sokol | ||
| */ | ||
| public class ExecuteMethodExceptionHandler { | ||
| private final static Logger log = getLogger(ExecuteMethodExceptionHandler.class); | ||
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| public void handle(Exception exception) { | ||
| if (exception instanceof IllegalArgumentException) { | ||
| throw new InterceptionException(exception); | ||
| } | ||
| if (exception instanceof ReflectionProviderException) { | ||
| throwIfNotValidationException(exception, exception.getCause()); | ||
| } | ||
| throwIfNotValidationException(exception, exception); | ||
| } | ||
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| private void throwIfNotValidationException(Throwable original, Throwable alternativeCause) { | ||
| Throwable cause = original.getCause(); | ||
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| if (original instanceof ValidationException || cause instanceof ValidationException) { | ||
| // fine... already parsed | ||
| log.trace("swallowing {}", cause); | ||
| } else { | ||
| throw new ApplicationLogicException(alternativeCause); | ||
| } | ||
| } | ||
| } |
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