/*
* #%L
* FlatPack serialization code
* %%
* Copyright (C) 2012 Perka Inc.
* %%
* Licensed 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.
* #L%
*/
package com.getperka.flatpack.visitors;
import java.util.Collection;
import java.util.Set;
import java.util.concurrent.Callable;
import javax.inject.Inject;
import com.getperka.flatpack.HasUuid;
import com.getperka.flatpack.ext.DeserializationContext;
import com.getperka.flatpack.ext.PostWorkOrder;
import com.getperka.flatpack.ext.Property;
import com.getperka.flatpack.util.FlatPackCollections;
/**
* The logic that is used to set implied properties. This work is deferred so that collection
* properties may be mutated after any payload values are set.
*/
@PostWorkOrder(100)
class ImpliedPropertySetter implements Callable<Void> {
@Inject
private DeserializationContext context;
private Property toSet;
private Object target;
private Object value;
/**
* Requires injection.
*/
ImpliedPropertySetter() {}
@Override
public Void call() throws Exception {
Class<?> type = toSet.getGetter().getReturnType();
if (Collection.class.isAssignableFrom(type)) {
HasUuid entity = (HasUuid) target;
Collection<Object> collection = null;
/*
* Update implied collections in-place. If the incoming payload had an explicit value for the
* collection property, it will have been reset to a new collection instance already.
*/
@SuppressWarnings("unchecked")
Collection<Object> temp = (Collection<Object>) toSet.getGetter().invoke(target);
collection = temp;
// Create a new collection as necessary
if (collection == null) {
if (Set.class.isAssignableFrom(type)) {
collection = FlatPackCollections.setForIteration();
} else {
collection = FlatPackCollections.listForAny();
}
toSet.getSetter().invoke(target, collection);
context.addModified(entity, toSet);
}
// We can't assume much about the collection's behavior
if (!collection.contains(value)) {
collection.add(value);
}
} else if (target instanceof Collection) {
for (Object element : (Collection<?>) target) {
toSet.getSetter().invoke(element, value);
}
} else {
toSet.getSetter().invoke(target, value);
}
return null;
}
/**
* Configure the ImpliedPropertySetter.
*
* @param toSet the property to set
* @param target the target entity or collection
* @param value the associated value to set
*/
public void setLater(Property toSet, Object target, Object value) {
if (toSet.getSetter() == null) {
throw new IllegalArgumentException("No setter");
}
this.toSet = toSet;
this.target = target;
this.value = value;
}
}