InfoProperties Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/info/InfoProperties.java lines 37–147

public class InfoProperties implements Iterable<InfoProperties.Entry> {

	private final Properties entries;

	/**
	 * Create an instance with the specified entries.
	 * @param entries the information to expose
	 */
	public InfoProperties(Properties entries) {
		Assert.notNull(entries, "'entries' must not be null");
		this.entries = copy(entries);
	}

	/**
	 * Return the value of the specified property or {@code null}.
	 * @param key the key of the property
	 * @return the property value
	 */
	public @Nullable String get(String key) {
		return this.entries.getProperty(key);
	}

	/**
	 * Return the value of the specified property as an {@link Instant} or {@code null} if
	 * the value is not a valid {@link Long} representation of an epoch time.
	 * @param key the key of the property
	 * @return the property value
	 */
	public @Nullable Instant getInstant(String key) {
		String s = get(key);
		if (s != null) {
			try {
				return Instant.ofEpochMilli(Long.parseLong(s));
			}
			catch (NumberFormatException ex) {
				// Not valid epoch time
			}
		}
		return null;
	}

	@Override
	public Iterator<Entry> iterator() {
		return new PropertiesIterator(this.entries);
	}

	/**
	 * Return a {@link PropertySource} of this instance.
	 * @return a {@link PropertySource}
	 */
	public PropertySource<?> toPropertySource() {
		return new PropertiesPropertySource(getClass().getSimpleName(), copy(this.entries));
	}

	private Properties copy(Properties properties) {
		Properties copy = new Properties();
		copy.putAll(properties);
		return copy;
	}

	private static final class PropertiesIterator implements Iterator<Entry> {

		private final Iterator<Map.Entry<Object, Object>> iterator;

		private PropertiesIterator(Properties properties) {
			this.iterator = properties.entrySet().iterator();
		}

		@Override
		public boolean hasNext() {
			return this.iterator.hasNext();
		}

		@Override
		public Entry next() {
			Map.Entry<Object, Object> entry = this.iterator.next();
			return new Entry((String) entry.getKey(), (String) entry.getValue());
		}

		@Override
		public void remove() {
			throw new UnsupportedOperationException("InfoProperties are immutable.");
		}

	}

	/**
	 * Property entry.
	 */
	public static final class Entry {

		private final String key;

		private final String value;

		private Entry(String key, String value) {
			this.key = key;
			this.value = value;
		}

		public String getKey() {
			return this.key;
		}

		public String getValue() {
			return this.value;
		}

	}

}