SystemEnvironmentConfigDataResource Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/context/config/SystemEnvironmentConfigDataResource.java lines 39–99

class SystemEnvironmentConfigDataResource extends ConfigDataResource {

	private final String variableName;

	private final PropertySourceLoader loader;

	private final Function<String, @Nullable String> environment;

	private final @Nullable Charset encoding;

	SystemEnvironmentConfigDataResource(String variableName, PropertySourceLoader loader,
			Function<String, @Nullable String> environment, @Nullable Charset encoding) {
		this.variableName = variableName;
		this.loader = loader;
		this.environment = environment;
		this.encoding = encoding;
	}

	String getVariableName() {
		return this.variableName;
	}

	PropertySourceLoader getLoader() {
		return this.loader;
	}

	@Nullable List<PropertySource<?>> load() throws IOException {
		String content = this.environment.apply(this.variableName);
		return (content != null)
				? this.loader.load(StringUtils.capitalize(toString()), asResource(content), this.encoding) : null;
	}

	private ByteArrayResource asResource(String content) {
		return new ByteArrayResource(content.getBytes(StandardCharsets.UTF_8));
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj) {
			return true;
		}
		if (obj == null || getClass() != obj.getClass()) {
			return false;
		}
		SystemEnvironmentConfigDataResource other = (SystemEnvironmentConfigDataResource) obj;
		return Objects.equals(this.loader.getClass(), other.loader.getClass())
				&& Objects.equals(this.variableName, other.variableName);
	}

	@Override
	public int hashCode() {
		return Objects.hash(this.variableName, this.loader.getClass());
	}

	@Override
	public String toString() {
		return "system environment variable [" + this.variableName + "] content loaded using "
				+ ClassUtils.getShortName(this.loader.getClass());
	}

}