67 lines
2.0 KiB
Java
67 lines
2.0 KiB
Java
package utils.config;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Properties;
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public final class AppConfig {
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private static volatile AppConfig instance;
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private final Properties properties = new Properties();
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private AppConfig() {
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load();
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}
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public static AppConfig getInstance() {
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if (instance == null) {
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synchronized (AppConfig.class) {
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if (instance == null) {
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instance = new AppConfig();
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}
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}
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}
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return instance;
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}
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private void load() {
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try (InputStream in = getClass().getClassLoader()
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.getResourceAsStream("application.properties")) {
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if (in == null) {
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throw new RuntimeException("Config file application.properties not found");
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}
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properties.load(in);
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} catch (IOException e) {
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throw new RuntimeException("Failed to load application.properties", e);
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}
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}
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/** Вернёт значение строки или null, если параметр не найден */
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public String getParam(String name) {
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String fromSystem = System.getProperty(name);
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if (fromSystem != null) return fromSystem;
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return properties.getProperty(name);
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}
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/** Вернёт строку или пустую строку, если параметр не найден. */
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public String getStringOrEmpty(String name) {
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String value = properties.getProperty(name);
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return value == null ? "" : value.trim();
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}
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/** Можно добавить методы для удобства */
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public int getInt(String name, int defaultValue) {
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String v = properties.getProperty(name);
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return v == null ? defaultValue : Integer.parseInt(v);
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}
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public boolean getBoolean(String name, boolean defaultValue) {
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String v = properties.getProperty(name);
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return v == null ? defaultValue : Boolean.parseBoolean(v);
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}
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}
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