Activity logger, Input validator

To search and validate activities

app/src/main/java/com/example/petstoremobile/utils/ActivityLogger.java

@@ -0,0 +1,45 @@
+package com.example.petstoremobile.utils;
+
+import android.content.Context;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+
+public class ActivityLogger {
+
+    private static final String LOG_FILE = "log.txt";
+
+    // Logs a general message with a timestamp
+    public static void log(Context context, String message) {
+        String timestamp = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault()).format(new Date());
+        String entry = timestamp + " | INFO | " + message + "\n";
+        writeToFile(context, entry);
+    }
+
+    // Logs a database change (ADD, UPDATE, DELETE) with entity type and ID
+    public static void logChange(Context context, String entity, String action, int id) {
+        String timestamp = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault()).format(new Date());
+        String entry = timestamp + " | DB CHANGE | " + action + " " + entity + " ID: " + id + "\n";
+        writeToFile(context, entry);
+    }
+
+    // Logs an exception with location info
+    public static void logException(Context context, String location, Exception e) {
+        String timestamp = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault()).format(new Date());
+        String entry = timestamp + " | ERROR | " + location + ": " + e.getMessage() + "\n";
+        writeToFile(context, entry);
+    }
+
+    // Writes the log entry to log.txt in internal storage
+    private static void writeToFile(Context context, String entry) {
+        try {
+            FileWriter fw = new FileWriter(context.getFilesDir() + "/" + LOG_FILE, true);
+            fw.write(entry);
+            fw.close();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

app/src/main/java/com/example/petstoremobile/utils/InputValidator.java

@@ -0,0 +1,97 @@
+package com.example.petstoremobile.utils;
+
+import android.widget.EditText;
+
+public class InputValidator {
+
+    // Checks if an EditText field is not empty
+    public static boolean isNotEmpty(EditText field, String fieldName) {
+        if (field.getText().toString().trim().isEmpty()) {
+            field.setError(fieldName + " is required");
+            field.requestFocus();
+            return false;
+        }
+        return true;
+    }
+
+    // Checks if the value is a positive integer
+    public static boolean isPositiveInteger(EditText field, String fieldName) {
+        String value = field.getText().toString().trim();
+        try {
+            int num = Integer.parseInt(value);
+            if (num < 0) {
+                field.setError(fieldName + " must be a positive number");
+                field.requestFocus();
+                return false;
+            }
+            return true;
+        } catch (NumberFormatException e) {
+            field.setError(fieldName + " must be a whole number");
+            field.requestFocus();
+            return false;
+        }
+    }
+
+    // Checks if the value is a positive decimal number
+    public static boolean isPositiveDecimal(EditText field, String fieldName) {
+        String value = field.getText().toString().trim();
+        try {
+            double num = Double.parseDouble(value);
+            if (num < 0) {
+                field.setError(fieldName + " must be a positive number");
+                field.requestFocus();
+                return false;
+            }
+            return true;
+        } catch (NumberFormatException e) {
+            field.setError(fieldName + " must be a number");
+            field.requestFocus();
+            return false;
+        }
+    }
+
+    // Checks if the email address is valid
+    public static boolean isValidEmail(EditText field) {
+        String email = field.getText().toString().trim();
+        if (email.isEmpty() || !android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
+            field.setError("Enter a valid email address");
+            field.requestFocus();
+            return false;
+        }
+        return true;
+    }
+
+    // Checks if the phone number is valid (digits, spaces, dashes, brackets allowed)
+    public static boolean isValidPhone(EditText field) {
+        String phone = field.getText().toString().trim();
+        if (phone.isEmpty() || !phone.matches("[0-9\\-\\s\\(\\)\\+]+")) {
+            field.setError("Enter a valid phone number");
+            field.requestFocus();
+            return false;
+        }
+        return true;
+    }
+
+    // Checks if the date is in YYYY-MM-DD format
+    public static boolean isValidDate(EditText field) {
+        String date = field.getText().toString().trim();
+        if (date.isEmpty() || !date.matches("\\d{4}-\\d{2}-\\d{2}")) {
+            field.setError("Date must be in YYYY-MM-DD format");
+            field.requestFocus();
+            return false;
+        }
+        return true;
+    }
+
+    // Checks if the time format is valid (e.g. 10:00 AM)
+    public static boolean isValidTime(EditText field) {
+        String time = field.getText().toString().trim();
+        if (time.isEmpty() || !time.matches("\\d{1,2}:\\d{2}\\s?(AM|PM|am|pm)?")) {
+            field.setError("Enter a valid time (e.g. 10:00 AM)");
+            field.requestFocus();
+            return false;
+        }
+        return true;
+    }
+}
+