com.tomtom.http.ResponseParser.groovy Maven / Gradle / Ivy

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A wrapper around Apache HttpClient and Jackson Databind libraries with lean Groovy syntax.

There is a newer version: 3.3.0

/*
 * Copyright (C) 2017. TomTom International BV (http://tomtom.com).
 *
 * 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.tomtom.http

import com.fasterxml.jackson.core.type.TypeReference
import com.fasterxml.jackson.databind.JavaType
import com.fasterxml.jackson.databind.ObjectMapper
import com.tomtom.http.response.Response
import org.apache.http.HttpEntity
import org.apache.http.HttpResponse
import org.apache.http.util.EntityUtils

class ResponseParser {

    private mapper = new ObjectMapper()

    Response parse(
            HttpResponse response,
            Class type,
            Class subtype) {
        new Response(
                statusCode: response.statusLine?.statusCode,
                headers: headersOf(response) as Map>,
                body: bodyOf(response, type, subtype))
    }

    private bodyOf(
            HttpResponse response,
            Class type,
            Class subtype) {
        def entity = response.entity as HttpEntity
        entity ? readEntity(entity, type, subtype) : null
    }

    private readEntity(
            HttpEntity entity,
            Class rawType,
            Class subtype) {
        def content = EntityUtils.toString entity
        if (rawType) {
            def type = subtype ?
                    typeOf(rawType, subtype) : typeOf(rawType)
            try {
                return mapper.readValue(content, type)
            } catch (Exception ignored) {
            }
        }
        content
    }

    private JavaType typeOf(
            Class type,
            Class subtype) {
        mapper.typeFactory
                .constructParametricType type, subtype
    }

    private JavaType typeOf(
            Class type) {
        mapper.typeFactory
                .constructType(new TypeReference