org.grails.web.databinding.bindingsource.HalJsonDataBindingSourceCreator.groovy Maven / Gradle / Ivy

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/*
 * Copyright 2013 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.grails.web.databinding.bindingsource

import grails.databinding.DataBindingSource;
import groovy.transform.CompileStatic

import grails.web.mime.MimeType


/**
 * Creates DataBindingSource objects from HAL JSON in the request body
 *
 * @since 2.3
 *
 * @author Jeff Brown
 * @author Graeme Rocher
 *
 * @see DataBindingSource
 * @see DataBindingSourceCreator
 */
@CompileStatic
class HalJsonDataBindingSourceCreator extends JsonDataBindingSourceCreator {

    public static final String HAL_EMBEDDED_ELEMENT = "_embedded"

    @Override
    MimeType[] getMimeTypes() {
        [MimeType.HAL_JSON] as MimeType[]
    }

    @Override
    protected Map createJsonMap(Object jsonElement) {
        if(jsonElement instanceof Map) {

            def jsonMap = (Map) jsonElement
            if(jsonMap.containsKey(HAL_EMBEDDED_ELEMENT)) {
                jsonMap = new LinkedHashMap(jsonMap)
                def embedded = jsonMap.get(HAL_EMBEDDED_ELEMENT)
                if(embedded instanceof Map) {
                    jsonMap.putAll((Map)embedded)
                }
            }
            return jsonMap
        }
        else {
            return super.createJsonMap(jsonElement)
        }
    }

}