/**
 * {@link <a href=
 * "https://[Log in to view URL]"
 * target= "_blank"></a>}
 * 
 * @author itammb ( Italia Massimiliano Buscati )
 * @version JDK 1.15
 *
 */

class Main {
	public static interface DataSourceComponent {
		public void writeData(String text);

		public String readData();
	}

	public static class FileDataSourceConcreteComponent implements DataSourceComponent {

		public FileDataSourceConcreteComponent(String fileName) {
			this.fileName = fileName;
		}

		private String fileName;

		public void writeData(String text) {
			System.out.println("LOG -- file:" + fileName + " operation: write" + " text: " + text);
		}

		public String readData() {
			String text = "text";
			System.out.println("LOG -- file:" + fileName + " operation: read" + " text: " + text);

			return text;
		}
	}

	public static class DataSourceDecorator implements DataSourceComponent {

		public DataSourceDecorator(DataSourceComponent wrappee) {
			this.wrappee = wrappee;
		}

		protected DataSourceComponent wrappee;

		public void writeData(String text) {
			wrappee.writeData(text);
		}

		public String readData() {
			return wrappee.readData();
		}
	}

	public static class EncryptionDecorator extends DataSourceDecorator {

		public EncryptionDecorator(DataSourceComponent wrappee) {
			super(wrappee);
		}

		public void writeData(String text) {
			text = "Encryption -- " + text;
			wrappee.writeData(text);
		}

		public String readData() {
			String text = wrappee.readData();
			return "Encryption -- " + text;
		}
	}

	public static class CompressDecorator extends DataSourceDecorator {

		public CompressDecorator(DataSourceComponent wrappee) {
			super(wrappee);
		}

		public void writeData(String text) {
			text = "Compression -- " + text;
			wrappee.writeData(text);
		}

		public String readData() {
			String text = wrappee.readData();
			return "Decompression -- " + text;
		}
	}

	public static void main(String args[]) {
		// Unit test - uso del design pattern: decorator

		FileDataSourceConcreteComponent source = new FileDataSourceConcreteComponent("somefile.dat");
		source.writeData("salary");

		DataSourceDecorator decorator = new CompressDecorator(source);
		decorator.writeData("salary");

	}
}