com.expedia.seiso.web.assembler.ItemAssociationHandler.java Source code

Introduction

Here is the source code for com.expedia.seiso.web.assembler.ItemAssociationHandler.java

Source

/* 
 * Copyright 2013-2015 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 com.expedia.seiso.web.assembler;

import java.util.List;

import lombok.AllArgsConstructor;
import lombok.val;
import lombok.extern.slf4j.XSlf4j;

import org.springframework.data.mapping.Association;
import org.springframework.data.mapping.PersistentProperty;
import org.springframework.data.mapping.SimpleAssociationHandler;
import org.springframework.data.mapping.model.BeanWrapper;

import com.expedia.seiso.core.ann.RestResource;
import com.expedia.seiso.domain.entity.Item;
import com.expedia.seiso.web.ApiVersion;
import com.expedia.seiso.web.hateoas.Resource;
import com.expedia.seiso.web.hateoas.link.ItemLinks;

/**
 * @author Willie Wheeler
 */
@AllArgsConstructor
@XSlf4j
public class ItemAssociationHandler implements SimpleAssociationHandler {
    private final ResourceAssembler assembler;
    private final ItemLinks itemLinks;
    private final ApiVersion apiVersion;
    private final ProjectionNode projection;
    private final BeanWrapper<? extends Item> wrapper;
    private final Resource resource;
    private final boolean topLevel;

    @Override
    public void doWithAssociation(Association<? extends PersistentProperty<?>> assoc) {
        val item = wrapper.getBean();

        // val doesn't work here for some reason.
        PersistentProperty<?> prop = assoc.getInverse();
        val propName = prop.getName();
        val propType = prop.getType();
        val child = projection.getChild(propName);

        // Link
        if (topLevel) {
            val restResource = prop.findAnnotation(RestResource.class);
            val path = (restResource == null ? propName : restResource.path());
            resource.addLink(itemLinks.itemPropertyLink(item, path));
        }

        // Property
        if (child != null) {
            if (Item.class.isAssignableFrom(propType)) {
                val propEntity = (Item) wrapper.getProperty(prop);
                val propResource = assembler.toResource(apiVersion, propEntity, child, false);
                resource.setAssociation(propName, propResource);
            } else if (List.class.isAssignableFrom(propType)) {
                val propEntityList = (List<?>) wrapper.getProperty(prop);
                val propResourceList = assembler.toResourceList(apiVersion, propEntityList, child);
                resource.setAssociation(propName, propResourceList);
            } else {
                log.warn("Don't know how to handle association type {}", propType);
            }
        }
    }
}