Context Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/context/properties/bind/Binder.java lines 577–694

	final class Context implements BindContext {

		private int depth;

		private final List<ConfigurationPropertySource> source = Arrays.asList((ConfigurationPropertySource) null);

		private int sourcePushCount;

		private final Deque<Class<?>> dataObjectBindings = new ArrayDeque<>();

		private final Deque<Class<?>> constructorBindings = new ArrayDeque<>();

		private @Nullable ConfigurationProperty configurationProperty;

		private void increaseDepth() {
			this.depth++;
		}

		private void decreaseDepth() {
			this.depth--;
		}

		private <T> T withSource(@Nullable ConfigurationPropertySource source, Supplier<T> supplier) {
			if (source == null) {
				return supplier.get();
			}
			ConfigurationPropertySource previous = this.source.get(0);
			this.source.set(0, source);
			this.sourcePushCount++;
			try {
				return supplier.get();
			}
			finally {
				this.sourcePushCount--;
				this.source.set(0, previous);
			}
		}

		private <T> @Nullable T withDataObject(Class<?> type, Supplier<@Nullable T> supplier) {
			this.dataObjectBindings.push(type);
			try {
				return withIncreasedDepth(supplier);
			}
			finally {
				this.dataObjectBindings.pop();
			}
		}

		private boolean isBindingDataObject(Class<?> type) {
			return this.dataObjectBindings.contains(type);
		}

		private <T> @Nullable T withIncreasedDepth(Supplier<@Nullable T> supplier) {
			increaseDepth();
			try {
				return supplier.get();
			}
			finally {
				decreaseDepth();
			}
		}

		void setConfigurationProperty(ConfigurationProperty configurationProperty) {
			this.configurationProperty = configurationProperty;
		}

		void clearConfigurationProperty() {
			this.configurationProperty = null;
		}

		void pushConstructorBoundTypes(Class<?> value) {
			this.constructorBindings.push(value);
		}

		boolean isNestedConstructorBinding() {
			return !this.constructorBindings.isEmpty();
		}

		void popConstructorBoundTypes() {
			this.constructorBindings.pop();
		}

		PlaceholdersResolver getPlaceholdersResolver() {
			return Binder.this.placeholdersResolver;
		}

		BindConverter getConverter() {
			return Binder.this.bindConverter;
		}

		Map<Object, Object> getCache() {
			return Binder.this.cache;
		}

		@Override
		public Binder getBinder() {
			return Binder.this;
		}

		@Override
		public int getDepth() {
			return this.depth;
		}

		@Override
		public Iterable<ConfigurationPropertySource> getSources() {
			if (this.sourcePushCount > 0) {
				return this.source;
			}
			return Binder.this.sources;
		}

		@Override
		public @Nullable ConfigurationProperty getConfigurationProperty() {
			return this.configurationProperty;
		}

	}