SnakeYAMLの使い方

5_description.markdown

SnakeYAML

YAMLファイルの読み込みサンプルプログラム

公式サイト

https://code.google.com/p/snakeyaml/wiki/Documentation

ブログ記事

http://www.task-notes.com/entry/20150923/1442977200

list.yaml

- Hesperiidae
- Papilionidae
- Apatelodidae
- Epiplemidae

loadAll.yaml

---
Time: 2001-11-23 15:01:42 -5
User: ed
Warning:
  This is an error message
  for the log file
---
Time: 2001-11-23 15:02:31 -5
User: ed
Warning:
  A slightly different error
  message.
---
Date: 2001-11-23 15:03:17 -5
User: ed
Warning:
  Unknown variable bar

map.yaml

none: [~, null]
bool: [true, false, on, off]
int: 42
float: 3.14159
list: [LITE, RES_ACID, SUS_DEXT]
dict: {hp: 13, sp: 5}

SnakeYamlDump.java

import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.nodes.Tag;

import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class SnakeYamlDump {
    public static void main(String[] args) {
        Yaml yaml = new Yaml();
        String yamlData;

        /** Listのダンプ */
        List<Object> list = Arrays.asList("hoge", null, 1234, true);
        yamlData = yaml.dump(list);
        System.out.println(yamlData);

        /** Mapのダンプ */
        Map<String, Object> map = new HashMap<String, Object>() {
            {put("Java", 5);}
            {put("Ruby", 3);}
            {put("Python", 2);}
        };
        yamlData = yaml.dump(map);
        System.out.println(yamlData);

        /** UserObjectのダンプ */
        User user = new User();
        user.setId(1);
        user.setName("tasukujp");
        user.setHobby(Arrays.asList("running", "bouldering", "baseball"));
        user.setSkill(new HashMap<String, Object>() {
            {put("Java", true);}
            {put("Ruby", null);}
        });
        yamlData = yaml.dumpAs(user, Tag.YAML, DumperOptions.FlowStyle.BLOCK);
        System.out.println(yamlData);
    }
}

SnakeYamlLoad.java

import org.yaml.snakeyaml.Yaml;

import java.util.List;
import java.util.Map;

public class SnakeYamlLoad {
    public static void main(String[] args) {
        Yaml yaml = new Yaml();

        /** Listのロード */
        List list = (List) yaml.load(ClassLoader.getSystemResourceAsStream("list.yaml"));
        System.out.println(list);

        /** Mapのロード */
        Map map = yaml.loadAs(ClassLoader.getSystemResourceAsStream("map.yaml"), Map.class);
        System.out.println(map);

        /** Userクラスのロード */
        User user = yaml.loadAs(ClassLoader.getSystemResourceAsStream("user.yaml"), User.class);
        System.out.println(user);

        /** 複数データのロード */
        for (Object data : yaml.loadAll(ClassLoader.getSystemResourceAsStream("loadAll.yaml"))) {
            System.out.println(data);
        }
    }
}

User.java

import java.util.List;
import java.util.Map;

public class User {
    private int id;
    private String name;
    private List<String> hobby;
    private Map<String, Object> skill;

    public int getId() { return id; }
    public void setId(int id) { this.id = id; }

    public String getName() { return name; }
    public void setName(String name) { this.name = name; }

    public List<String> getHobby() { return hobby; }
    public void setHobby(List<String> hobby) { this.hobby = hobby; }
    
    public Map<String, Object> getSkill() { return skill; }
    public void setSkill(Map<String, Object> skill) { this.skill = skill; }

    @Override
    public String toString() {
        return "id=" + id + ", name=" + name + ", hobby=" + hobby + ", skill=" + skill;
    }
}

user.yaml

id: 1
name: tasuku
hobby:
  - "running"
  - "bouldering"
  - "baseball"
skill:
  "Java": null
  "Ruby": True