PropertiesMergingResourceTransformer Class — spring-boot Architecture

Source Code

build-plugin/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/PropertiesMergingResourceTransformer.java lines 41–110

public class PropertiesMergingResourceTransformer implements ReproducibleResourceTransformer {

	// Set this in pom configuration with <resource>...</resource>
	private @Nullable String resource;

	private final Properties data = new Properties();

	private long time;

	/**
	 * Return the data the properties being merged.
	 * @return the data
	 */
	public Properties getData() {
		return this.data;
	}

	@Override
	public boolean canTransformResource(String resource) {
		return this.resource != null && this.resource.equalsIgnoreCase(resource);
	}

	@Override
	@Deprecated(since = "2.4.0", forRemoval = false)
	public void processResource(String resource, InputStream inputStream, List<Relocator> relocators)
			throws IOException {
		processResource(resource, inputStream, relocators, 0);
	}

	@Override
	public void processResource(String resource, InputStream inputStream, List<Relocator> relocators, long time)
			throws IOException {
		Properties properties = new Properties();
		properties.load(inputStream);
		properties.forEach((name, value) -> process((String) name, (String) value));
		if (time > this.time) {
			this.time = time;
		}
	}

	private void process(String name, String value) {
		String existing = this.data.getProperty(name);
		this.data.setProperty(name, (existing != null) ? existing + "," + value : value);
	}

	@Override
	public boolean hasTransformedResource() {
		return !this.data.isEmpty();
	}

	@Override
	public void modifyOutputStream(JarOutputStream os) throws IOException {
		Assert.state(this.resource != null, "'resource' must not be null");
		JarEntry jarEntry = new JarEntry(this.resource);
		jarEntry.setTime(this.time);
		os.putNextEntry(jarEntry);
		this.data.store(os, "Merged by PropertiesMergingResourceTransformer");
		os.flush();
		this.data.clear();
	}

	public @Nullable String getResource() {
		return this.resource;
	}

	public void setResource(@Nullable String resource) {
		this.resource = resource;
	}

}