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CoreOrderResourceProcessor.java
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CoreOrderResourceProcessor.java
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/*
* Copyright 2012-2019 the original author or authors.
*
* 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.
*/
package org.springsource.restbucks.order.web;
import lombok.NonNull;
import lombok.RequiredArgsConstructor;
import org.springframework.hateoas.EntityModel;
import org.springframework.hateoas.server.EntityLinks;
import org.springframework.hateoas.server.RepresentationModelProcessor;
import org.springframework.stereotype.Component;
import org.springsource.restbucks.order.Order;
/**
* {@link ResourceProcessor} implementation to add links to the {@link Order} representation that indicate that the
* Order can be updated or cancelled as long as it has not been paid yet.
*
* @author Oliver Gierke
*/
@Component
@RequiredArgsConstructor
class CoreOrderResourceProcessor implements RepresentationModelProcessor<EntityModel<Order>> {
public static final String CANCEL_REL = "cancel";
public static final String UPDATE_REL = "update";
private final @NonNull EntityLinks entityLinks;
/*
* (non-Javadoc)
* @see org.springframework.hateoas.server.RepresentationModelProcessor#process(org.springframework.hateoas.RepresentationModel)
*/
@Override
public EntityModel<Order> process(EntityModel<Order> resource) {
var typedEntityLinks = entityLinks.forType(Order::getId);
var order = resource.getContent();
if (!order.isPaid()) {
var orderLink = typedEntityLinks.linkForItemResource(order);
resource.add(orderLink.withRel(CANCEL_REL));
resource.add(orderLink.withRel(UPDATE_REL));
}
return resource;
}
}