task 1

README.md

@@ -1,6 +1,7 @@
 # PPJ
 
-This repository exists to archive PJATK tasks for the PPJ curriculum.
+This branch contains the solution for the **1st task**.
 
-Each task can be found under its **corresponding branch**: `task/n`.  
+This solution contains Rust code :333c
-Example: `task/2`.
+
+[Go back to main](/femsci/ppj/src/branch/nya)

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j1-rs/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "j1-rs"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate_type = ["cdylib"]
+
+[dependencies]
+jni = "0.21.1"

j1-rs/src/lib.rs

@@ -0,0 +1,32 @@
+use jni::{objects::JClass, sys::jstring, JNIEnv};
+
+#[no_mangle]
+pub extern "system" fn Java_dev_femsci_pjatk1_Main_histogen(
+    env: JNIEnv,
+    _class: JClass,
+    data: i32,
+) -> jstring {
+    let shift = |s: u8| ((data & (0xff << s)) >> s) as u8;
+    let (i0, i1, i2): (u8, u8, u8) = (shift(16), shift(8), shift(0));
+    let max = i0.max(i1.max(i2));
+
+    let mut buf = String::new();
+
+    for i in 0..max {
+        let f_ast = |num: u8| {
+            let idx = max - i;
+            match idx <= num {
+                true => '*',
+                false => ' ',
+            }
+        };
+
+        buf.push_str(&format!("{}{}{}\n", f_ast(i0), f_ast(i1), f_ast(i2)));
+    }
+
+    let str_f = env
+        .new_string(buf.trim_end())
+        .expect("Cannot create string.");
+
+    str_f.into_raw()
+}

src/dev/femsci/pjatk1/Main.java

@@ -0,0 +1,88 @@
+package dev.femsci.pjatk1;
+
+import java.util.function.BiFunction;
+
+/*
+    by femsci
+ */
+public class Main {
+    public Main() {
+    }
+
+    //jni ref
+    public static native String histogen(int data);
+
+    /*
+      Task 1
+      
+      the premise: under some constraints, print a histogram
+      
+      solution:
+      - parse the input
+      - get the greatest input value, use it as histogram bar height
+      - iterate over the height, inverse printing bars (bottom up) when value >= index
+     
+     // // // Rust > C# >>>>> java
+     */
+    
+    //some brief validation messages conveying low-quality reports
+    public static void main(String[] args) {
+        if(args.length != 3) {
+            System.err.println("No valid arguments provided.");
+            System.exit(1);
+            return;
+        }
+        
+        byte i0, i1, i2;
+        try {
+            i1 = Byte.parseByte(args[1]);
+            i0 = Byte.parseByte(args[0]);
+            i2 = Byte.parseByte(args[2]);
+        } catch(NumberFormatException _e) {
+            System.err.println("Provided arguments are invalid.");
+            System.exit(1);
+            return;
+        }
+
+        System.out.println("executing the task...");
+        
+        try {
+            System.loadLibrary("j1_rs");
+            long t1 = System.nanoTime();
+            via_jni(i0, i1, i2);
+            long t2 = System.nanoTime();
+
+            System.out.printf("operation took %dµs %n", Math.ceilDiv(t2 - t1, 1000));
+        } catch (UnsatisfiedLinkError _e) {
+            System.err.println("cannot locate the library to perform jni variant");
+        }
+    
+        long t1 = System.nanoTime();
+        via_plain_java(i0, i1, i2);
+        long t2 = System.nanoTime();
+        
+        System.out.printf("operation took %dµs %n", Math.ceilDiv(t2 - t1, 1000));
+    }
+
+    private static void via_jni(byte i0, byte i1, byte i2) {
+        System.out.println("\nvia JNI to a Rust lib:");
+        int data = (i0 << 16) | (i1 << 8) | i2;
+        
+        //can also directly write to stdout in the rust lib
+        System.out.println(histogen(data));
+    }
+
+    private static void via_plain_java(byte i0, byte i1, byte i2) {
+        System.out.println("\nvia the plain old Java:");
+        
+        int max = Math.max(i0, Math.max(i1, i2));
+
+        //cant use primitives in lambdas
+        BiFunction<Integer, Byte, Character> ast = (idx, b) -> b > idx ? '*' : ' ';
+        
+        //i hate java for lack of delegates and proper closures
+        for(int i = max - 1; i >= 0; --i) {
+            System.out.printf("%s%s%s%n", ast.apply(i, i0), ast.apply(i, i1), ast.apply(i, i2));
+        }
+    }
+}