sw_concepts: rewrite abstractions.py to java

topics/sw_concepts/code/pattern-examples/src/main/java/ch/scs/jumpstart/pattern/examples/Abstractions.java

@@ -0,0 +1,134 @@
+package ch.scs.jumpstart.pattern.examples;
+
+import java.io.*;
+import java.nio.file.*;
+import java.util.*;
+import java.util.concurrent.TimeUnit;
+
+public class Abstractions {
+
+  private static final int INPUT_MIN = 0;
+  private static final int INPUT_MAX_TSL2550 = 544;
+  private static final int INPUT_THRESHOLD = 11;
+
+  private static final double OUTPUT_MIN_FACTOR = 0.2;
+  private static final double OUTPUT_CHANGE_MAX_FACTOR = 0.005;
+
+  private static final int[] SENSOR_VALUE_LUX_APPROX_MAP = {
+    0, 1, 2, 3, 4, 5, 6, 7,
+    8, 9, 10, 11, 12, 13, 14, 15,
+    16, 18, 20, 22, 24, 26, 28, 30,
+    32, 34, 36, 38, 40, 42, 44, 46,
+    49, 53, 57, 61, 65, 69, 73, 77,
+    81, 85, 89, 93, 97, 101, 105, 109,
+    115, 123, 131, 139, 147, 155, 163, 171,
+    179, 187, 195, 203, 211, 219, 227, 235,
+    247, 263, 279, 295, 311, 327, 343, 359,
+    375, 391, 407, 423, 439, 455, 471, 487,
+    511, 543, 575, 607, 639, 671, 703, 735,
+    767, 799, 831, 863, 895, 927, 959, 991,
+    1039, 1103, 1167, 1231, 1295, 1359, 1423, 1487,
+    1551, 1615, 1679, 1743, 1807, 1871, 1935, 1999,
+    2095, 2223, 2351, 2479, 2607, 2735, 2863, 2991,
+    3119, 3247, 3375, 3503, 3631, 3759, 3887, 4015
+  };
+
+  @SuppressWarnings({
+    "PMD.CognitiveComplexity",
+    "PMD.CyclomaticComplexity",
+    "PMD.SystemPrintln",
+    "PMD.AvoidPrintStackTrace"
+  })
+  public static void main(String[] args) throws IOException {
+    if (args.length != 3) {
+      throw new IllegalArgumentException("Wrong number of arguments");
+    }
+
+    String path = args[0];
+    String inputPath = args[1];
+    String outputPath = args[2];
+    boolean opt3001 =
+        Files.isSymbolicLink(Paths.get(inputPath))
+            && Files.readSymbolicLink(Paths.get(inputPath))
+                .toString()
+                .contains("in_illuminance_input");
+
+    int inputMax = INPUT_MAX_TSL2550;
+    int inputLastValue = INPUT_MIN - INPUT_THRESHOLD;
+    Integer outputLastValue = null;
+
+    try (BufferedReader reader = new BufferedReader(new FileReader(path))) {
+      int outputMax = Integer.parseInt(reader.readLine().trim());
+      int outputMin = (int) Math.ceil(outputMax * OUTPUT_MIN_FACTOR);
+      int outputChangeMax = (int) Math.ceil(outputMax * OUTPUT_CHANGE_MAX_FACTOR);
+
+      while (true) {
+        try {
+          int inputValue;
+          if (opt3001) {
+            try (BufferedReader inputReader = new BufferedReader(new FileReader(inputPath))) {
+              inputValue = (int) Double.parseDouble(inputReader.readLine().trim());
+            } catch (IOException e) {
+              inputValue = INPUT_MIN;
+            }
+          } else {
+            try (BufferedReader inputReader = new BufferedReader(new FileReader(inputPath))) {
+              inputValue = Integer.parseInt(inputReader.readLine().trim());
+            }
+            if (0 <= inputValue && inputValue < SENSOR_VALUE_LUX_APPROX_MAP.length) {
+              inputValue = SENSOR_VALUE_LUX_APPROX_MAP[inputValue];
+            } else {
+              inputValue = inputLastValue;
+            }
+          }
+
+          inputValue = Math.min(inputValue, inputMax);
+
+          if (Math.abs(inputValue - inputLastValue) < INPUT_THRESHOLD) {
+            inputValue = inputLastValue;
+          }
+
+          double a = (inputValue - INPUT_MIN) / (double) (inputMax - INPUT_MIN);
+          int value1 = (int) (a * (outputMax - outputMin) + outputMin);
+          int outputValue = Math.min(value1, outputMax);
+
+          if (outputLastValue == null) {
+            outputValue = outputValue;
+          } else if (outputValue >= outputLastValue) {
+            outputValue = Math.min(outputValue, outputLastValue + outputChangeMax);
+          } else {
+            outputValue = Math.max(outputValue, outputLastValue - outputChangeMax);
+          }
+          int dimmedValue = outputValue;
+
+          if (!Objects.equals(outputValue, outputLastValue)) {
+            System.out.printf(
+                "input: %4d (%4.1f%%), output: %4d (%4.1f%%), dimmed: %4d (%4.1f%%)%n",
+                inputValue,
+                100 * (inputValue - INPUT_MIN) / (double) (inputMax - INPUT_MIN),
+                outputValue,
+                100 * (outputValue - outputMin) / (double) (outputMax - outputMin),
+                dimmedValue,
+                100 * (dimmedValue - outputMin) / (double) (outputMax - outputMin));
+            System.out.flush();
+          }
+
+          try (BufferedWriter writer = new BufferedWriter(new FileWriter(outputPath))) {
+            outputLastValue = outputValue;
+            writer.write(String.valueOf(outputValue));
+          }
+
+          inputLastValue = inputValue;
+        } catch (IOException e) {
+          if (!(e instanceof FileNotFoundException)) {
+            throw e;
+          }
+        }
+
+        TimeUnit.MILLISECONDS.sleep(10);
+      }
+    } catch (IOException | InterruptedException e) {
+      e.printStackTrace();
+    }
+  }
+}