/*
* 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.core.metamodel.facets.object.mixin;
import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import org.apache.isis.core.metamodel.specloader.validator.MetaModelValidatorForValidationFailures;
public class MetaModelValidatorForMixinTypes extends MetaModelValidatorForValidationFailures {
private final String annotation;
public MetaModelValidatorForMixinTypes(final String annotation) {
this.annotation = annotation;
}
public boolean ensureMixinType(final Class<?> candidateMixinType) {
boolean mixinType = has1ArgConstructor(candidateMixinType);
if (mixinType) {
return true;
}
addFailure("%s: annotated with %s annotation but does not have a public 1-arg constructor",
candidateMixinType.getName(), annotation);
return false;
}
private static boolean has1ArgConstructor(final Class<?> cls) {
final Constructor<?>[] constructors = cls.getConstructors();
for (final Constructor<?> constructor : constructors) {
final Class<?>[] parameterTypes = constructor.getParameterTypes();
if (parameterTypes.length == 1 && Modifier.isPublic(constructor.getModifiers())) {
return true;
}
}
return false;
}
}