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package org.glassfish.jersey.tests.cdi.bv;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.function.Supplier;
import javax.ws.rs.core.Context;
import javax.enterprise.inject.Vetoed;
import javax.inject.Inject;
import javax.inject.Provider;
import javax.inject.Singleton;
import javax.validation.ConstraintViolationException;
import javax.validation.ValidationException;
import org.glassfish.jersey.internal.inject.AbstractBinder;
import org.glassfish.jersey.server.spi.ValidationInterceptor;
import org.glassfish.jersey.server.spi.ValidationInterceptorContext;
/**
* HK2 managed validation interceptor.
*/
@Vetoed
public class Hk2ValidationInterceptor implements ValidationInterceptor {
private final Provider<Hk2ValidationResult> validationResult;
public Hk2ValidationInterceptor(Provider<Hk2ValidationResult> validationResult) {
this.validationResult = validationResult;
}
public static class Binder extends AbstractBinder {
@Override
protected void configure() {
bindFactory(ValidationInterceptorFactory.class, Singleton.class)
.to(ValidationInterceptor.class);
}
}
private static class ValidationInterceptorFactory implements Supplier<ValidationInterceptor> {
@Inject
Provider<Hk2ValidationResult> validationResultProvider;
@Override
public ValidationInterceptor get() {
return new Hk2ValidationInterceptor(validationResultProvider);
}
}
@Override
public void onValidate(
ValidationInterceptorContext ctx) throws ValidationException {
try {
ctx.proceed();
} catch (ConstraintViolationException ex) {
ensureValidationResultInjected(ctx, ex);
validationResult.get().setViolations(ex.getConstraintViolations());
}
}
private void ensureValidationResultInjected(
final ValidationInterceptorContext ctx, final ConstraintViolationException ex) {
if (!isValidationResultInArgs(ctx.getArgs())
&& !isValidationResultInResource(ctx)
&& !hasValidationResultProperty(ctx.getResource())) {
throw ex;
}
}
private boolean isValidationResultInResource(ValidationInterceptorContext ctx) {
Class<?> clazz = ctx.getResource().getClass();
do {
for (Field f : clazz.getDeclaredFields()) {
// Of ValidationResult and JAX-RS injectable
if (ValidationResult.class.isAssignableFrom(f.getType())
&& f.getAnnotation(Context.class) != null) {
return true;
}
}
clazz = clazz.getSuperclass();
} while (clazz != Object.class);
return false;
}
private boolean isValidationResultInArgs(Object[] args) {
for (Object a : args) {
if (a != null && ValidationResult.class.isAssignableFrom(a.getClass())) {
return true;
}
}
return false;
}
/**
* Determines if a resource has a property of type {@code javax.mvc.validation.ValidationResult}.
*
* @param resource resource instance.
* @return outcome of test.
*/
public static boolean hasValidationResultProperty(final Object resource) {
return getValidationResultGetter(resource) != null && getValidationResultSetter(resource) != null;
}
/**
* Returns a getter for {@code javax.mvc.validation.ValidationResult} or {@code null}
* if one cannot be found.
*
* @param resource resource instance.
* @return getter or {@code null} if not available.
*/
public static Method getValidationResultGetter(final Object resource) {
Class<?> clazz = resource.getClass();
do {
for (Method m : clazz.getDeclaredMethods()) {
if (isValidationResultGetter(m)) {
return m;
}
}
clazz = clazz.getSuperclass();
} while (clazz != Object.class);
return null;
}
/**
* Determines if a method is a getter for {@code javax.mvc.validation.ValidationResult}.
*
* @param m method to test.
* @return outcome of test.
*/
private static boolean isValidationResultGetter(Method m) {
return m.getName().startsWith("get")
&& ValidationResult.class.isAssignableFrom(m.getReturnType())
&& Modifier.isPublic(m.getModifiers()) && m.getParameterTypes().length == 0;
}
/**
* Returns a setter for {@code javax.mvc.validation.ValidationResult} or {@code null}
* if one cannot be found.
*
* @param resource resource instance.
* @return setter or {@code null} if not available.
*/
public static Method getValidationResultSetter(final Object resource) {
Class<?> clazz = resource.getClass();
do {
for (Method m : clazz.getDeclaredMethods()) {
if (isValidationResultSetter(m)) {
return m;
}
}
clazz = clazz.getSuperclass();
} while (clazz != Object.class);
return null;
}
/**
* Determines if a method is a setter for {@code javax.mvc.validation.ValidationResult}.
* As a CDI initializer method, it must be annotated with {@link javax.inject.Inject}.
*
* @param m method to test.
* @return outcome of test.
*/
private static boolean isValidationResultSetter(Method m) {
return m.getName().startsWith("set") && m.getParameterTypes().length == 1
&& ValidationResult.class.isAssignableFrom(m.getParameterTypes()[0])
&& m.getReturnType() == Void.TYPE && Modifier.isPublic(m.getModifiers())
&& m.getAnnotation(Context.class) != null;
}
}