/*
* 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.isis.metamodel.examples.facets.jsr303;
import java.util.Set;
import javax.validation.InvalidConstraint;
import javax.validation.ValidationProviderFactory;
import javax.validation.Validator;
import org.apache.isis.applib.events.ValidityEvent;
import org.apache.isis.metamodel.adapter.ObjectAdapter;
import org.apache.isis.metamodel.facets.Facet;
import org.apache.isis.metamodel.facets.FacetAbstract;
import org.apache.isis.metamodel.facets.FacetHolder;
import org.apache.isis.metamodel.interactions.ProposedHolder;
import org.apache.isis.metamodel.interactions.ValidatingInteractionAdvisor;
import org.apache.isis.metamodel.interactions.ValidityContext;
import org.apache.isis.metamodel.spec.identifier.Identified;
public class Jsr303PropertyValidationFacet extends FacetAbstract implements ValidatingInteractionAdvisor {
public static Class<? extends Facet> type() {
return Jsr303PropertyValidationFacet.class;
}
private final Identified identifierHolder;
public Jsr303PropertyValidationFacet(final FacetHolder holder) {
super(type(), holder, false);
identifierHolder = (holder instanceof Identified) ? (Identified)holder : null;
}
@SuppressWarnings("unchecked")
public String invalidates(final ValidityContext<? extends ValidityEvent> validityContext) {
final Validator validator = getTargetValidator(validityContext);
final Object proposed = getProposed(validityContext);
if (validator == null || proposed == null || identifierHolder == null) {
return null;
}
final String memberName = identifierHolder.getIdentifier().getMemberName();
Set<InvalidConstraint<?>> constraints = validator.validateValue(memberName, proposed);
return asString(memberName, constraints);
}
private Validator<?> getTargetValidator(final ValidityContext<? extends ValidityEvent> validityContext) {
final ObjectAdapter targetNO = validityContext.getTarget();
final Object targetObject = targetNO.getObject();
final Class<?> cls = targetObject.getClass();
return ValidationProviderFactory.createValidator(cls);
}
private Object getProposed(final ValidityContext<? extends ValidityEvent> validityContext) {
if (!(validityContext instanceof ProposedHolder)) {
return null;
}
final ProposedHolder propertyModifyContext = (ProposedHolder) validityContext;
final ObjectAdapter proposedNO = propertyModifyContext.getProposed();
if (proposedNO == null) {
return null;
}
return proposedNO.getObject();
}
private String asString(final String memberName, final Set<InvalidConstraint<?>> constraints) {
if (constraints.isEmpty()) {
return null;
}
final StringBuilder buf = new StringBuilder(memberName + " is invalid: ");
boolean first = true;
for (final InvalidConstraint<?> constraint : constraints) {
if (!first) {
buf.append("; ");
} else {
first = false;
}
buf.append(constraint.getMessage());
}
return buf.toString();
}
}