/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.openjpa.persistence.validation;
import javax.persistence.ValidationMode;
import org.apache.openjpa.conf.OpenJPAConfiguration;
import org.apache.openjpa.lib.log.Log;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.lib.util.Localizer.Message;
import org.apache.openjpa.validation.ValidationUnavailableException;
/**
* Validation helper routines and wrappers to remove runtime dependencies
* on the Bean Valdiation APIs or a implementation.
*
* Note: This class should have no direct dependency on the javax.validation
* packages, which should only occur in the ValidatorImpl class.
*
* @version $Rev$ $Date$
*/
public class ValidationUtils {
private static final Localizer _loc = Localizer.forPackage(
ValidationUtils.class);
/**
* Setup Validation support by determining if the javax.validation APIs
* are available and then create a Validator if required by the
* provided configuration.
* @param conf
* @return true if a Validator was created, false otherwise.
* @throws If a Validator was required but could not be created.
*/
public static boolean setupValidation(OpenJPAConfiguration conf) {
Log log = conf.getConfigurationLog();
boolean brc = false;
// only try creating a Validator for JPA2 and if not mode==NONE
if (conf.getSpecificationInstance().getVersion() < 2) {
if (log.isTraceEnabled()) {
log.trace("Not creating a ValidatorImpl because " +
"this app is using the JPA 1.0 Spec");
}
}
else if (!(String.valueOf(ValidationMode.NONE)
.equalsIgnoreCase(conf.getValidationMode()))) {
// we'll use this in the exception handlers
boolean bValRequired = String.valueOf(ValidationMode.CALLBACK)
.equalsIgnoreCase(conf.getValidationMode());
try {
// see if the javax.validation spec api is available
if (log.isTraceEnabled()) {
log.trace("Trying to load javax.validation APIs " +
"based on the ValidationMode="
+ conf.getValidationMode());
}
@SuppressWarnings("unused")
Class<?> c = Class.forName(
"javax.validation.ValidationException");
} catch (ClassNotFoundException e) {
if (bValRequired) {
// fatal error - ValidationMode requires a validator
Message msg = _loc.get("vlem-creation-error");
log.error(msg, e);
// rethrow as a more descriptive/identifiable exception
throw new ValidationUnavailableException(
msg.getMessage(),
new RuntimeException(e), true);
} else {
// no optional validation provider, so just trace output
if (log.isTraceEnabled()) {
log.trace(_loc.get("vlem-creation-warn",
"No available javax.validation APIs"));
}
return brc;
}
}
// we have the javax.validation APIs
try {
// try loading a validation provider
ValidatorImpl validator = new ValidatorImpl(conf);
// set the Validator into the config
conf.setValidatorInstance(validator);
// update the LifecycleEventManager plugin to use it
conf.setLifecycleEventManager("validating");
// all done, so return good rc if anyone cares
brc = true;
} catch (RuntimeException e) {
if (bValRequired) {
// fatal error - ValidationMode requires a validator
// rethrow as a WrappedException
Message msg = _loc.get("vlem-creation-error");
log.error(msg, e);
// rethrow as a more descriptive/identifiable exception
throw new ValidationUnavailableException(
msg.getMessage(),
e, true);
} else {
// unexpected, but validation is optional,
// so just log it as a warning
String msg = e.getMessage();
log.warn(_loc.get("vlem-creation-warn", msg == null ? e : msg ));
return brc;
}
}
} else {
if (log.isTraceEnabled()) {
log.trace("Not creating a ValidatorImpl because " +
"ValidationMode=" + conf.getValidationMode());
}
}
return brc;
}
/**
* Determines whether an exception is a constraint violation exception via
* class name. Does not require JSR-303 API to be in classpath.
* @param e exception to check
* @return true of the exception is a constraint violation exception
*/
public static boolean isConstraintViolationException(Exception e) {
if (e == null)
return false;
if (e.getClass().getName().equals(
"javax.validation.ConstraintViolationException"))
return true;
return false;
}
}