demo.FleetLocationNarrower.java Source code

Introduction

Here is the source code for demo.FleetLocationNarrower.java

Source

/*
 * Copyright 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 demo;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * @author Dave Syer
 *
 */
@Configuration
@EnableAutoConfiguration
public class FleetLocationNarrower implements CommandLineRunner {

    @Value("${fleet.json:classpath:/fleet.json}")
    private Resource fleet;

    @Value("${fleet.longitude:-77.0164}")
    private double longitude;

    @Value("${fleet.radius:1}")
    private double radius;

    @Value("${fleet.laitude:38.9047}")
    private double latitude;

    @Autowired
    ObjectMapper mapper;

    @Override
    public void run(String... args) throws Exception {
        List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
        for (Map<String, Object> location : loadJson(this.fleet)) {
            if (closeEnough(location)) {
                list.add(location);
            }
        }
        this.mapper.writeValue(new FileSystemResource("new_fleet.json").getOutputStream(), list);
    }

    private boolean closeEnough(Map<String, Object> location) {
        if (location.get("longitude") == null || location.get("latitude") == null) {
            return false;
        }
        Double locLong = Double.valueOf((String) location.get("longitude"));
        Double locLat = Double.valueOf((String) location.get("latitude"));
        if (locLat != null && locLong != null) {
            if (this.latitude + 5 > locLat && this.latitude - this.radius < locLat
                    && this.longitude + this.radius > locLong && this.longitude - this.radius < locLong) {
                return true;
            }
        }
        return false;
    }

    public static void main(String[] args) {
        new SpringApplicationBuilder(FleetLocationNarrower.class).web(false)
                .properties("spring.jackson.serialization.INDENT_OUTPUT=true").run(args);
    }

    private List<Map<String, Object>> loadJson(Resource resource)
            throws IOException, JsonParseException, JsonMappingException {
        return this.mapper.readValue(resource.getInputStream(), new TypeReference<List<Map<String, Object>>>() {
        });
    }

}