TypedMap

[Maven usage]

<project>
  ...
  <repositories>
    <repository>
      <id>qpg.jp</id>
      <name>qpg.jp repository</name>
      <url>http://qpg.jp/maven</url>
    </repository>
  </repositories>
  <dependencies>
    <dependency>
      <groupId>jp.qpg</groupId>
      <artifactId>TypedMap</artifactId>
      <version>1.0.0</version>
    </dependency>
  </dependencies>
</project>

[Example]

(Settings.java)

import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.time.LocalDate;
import java.util.Locale;
import java.util.Properties;
import java.util.logging.Logger;

import jp.qpg.TypedMap;
import jp.qpg.TypedMap.Key;

@SuppressWarnings("javadoc")
public interface Settings {
    TypedMap map = new TypedMap(() -> {
        String path = "settings.properties";
        Properties p = new Properties();
        try (Reader reader = new InputStreamReader(ClassLoader.getSystemResourceAsStream(path), StandardCharsets.UTF_8)) {
            p.load(reader);
        } catch (Exception e) {
            Logger.getGlobal().warning("cannot load config file: " + path);
        }
        return p;
    });

    Key<String> title = map.key("title");

    Key<Integer> timeout = map.key("timeout", 30);

    Key<Locale> locale = map.key("locale", Locale.getDefault());

    Key<Charset> charset = map.key("charset", Charset.defaultCharset());

    Key<LocalDate> start = map.key("start", LocalDate.now());

    public static void main(String... __) {
        System.out.println(Settings.title); /* 文字列表現でよければtoStringで取得可能 */
        int timeout = Settings.timeout.get(); /* タイプセーフ */
        System.out.println(timeout);
        System.out.println();

        System.out.println("キー名 = " + Settings.title.name);
        System.out.println("値 = " + Settings.title);
        System.out.println("デフォルト値 = " + Settings.title.value);
        System.out.println("型 = " + Settings.title.type);
        System.out.println();
        System.out.println("キー名 = " + Settings.timeout.name);
        System.out.println("値 = " + Settings.timeout);
        System.out.println("デフォルト値 = " + Settings.timeout.value);
        System.out.println("型 = " + Settings.timeout.type);
        System.out.println();
        System.out.println("キー名 = " + Settings.locale.name);
        System.out.println("値 = " + Settings.locale);
        System.out.println("デフォルト値 = " + Settings.locale.value);
        System.out.println("型 = " + Settings.locale.type);
        System.out.println();
        System.out.println("キー名 = " + Settings.charset.name);
        System.out.println("値 = " + Settings.charset);
        System.out.println("デフォルト値 = " + Settings.charset.value);
        System.out.println("型 = " + Settings.charset.type);
        System.out.println();
        System.out.println("キー名 = " + Settings.start.name);
        System.out.println("値 = " + Settings.start);
        System.out.println("デフォルト値 = " + Settings.start.value);
        System.out.println("型 = " + Settings.start.type);
    }
}

(settings.properties)

title = 型安全なプロパティ
timeout = 45
locale = ja
charset = MS932
start = 2017-01-01

(Run Settings)

型安全なプロパティ
45

キー名 = title
値 = 型安全なプロパティ
デフォルト値 = null
型 = class java.lang.String

キー名 = timeout
値 = 45
デフォルト値 = 30
型 = class java.lang.Integer

キー名 = locale
値 = ja
デフォルト値 = ja_JP
型 = class java.util.Locale

キー名 = charset
値 = windows-31j
デフォルト値 = UTF-8
型 = class java.nio.charset.Charset

キー名 = start
値 = 2017-01-01
デフォルト値 = 2017-06-15
型 = class java.time.LocalDate

nakazawaken1/TypedMap

TypedMap