chapter 05: copy logAnalyzer.js, errors and fakes from the folder of …

…chapter 04 in order to continue with the book

chapter_05-isolation-frameworks/errors/ArgumentError.js

@@ -0,0 +1,3 @@
+class ArgumentError extends Error {}
+
+module.exports = ArgumentError;

chapter_05-isolation-frameworks/fakes/fakeWebService.js

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+function fakeWebService() {
+    let lastError;
+
+    /**
+     * @param {string} message
+     */
+    function logError(message) {
+        lastError = message;
+    }
+
+    function getLastError() {
+        return lastError;
+    }
+
+    return {
+        logError,
+        getLastError,
+    };
+}
+
+module.exports = fakeWebService;

chapter_05-isolation-frameworks/logAnalyzer.js

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+const ArgumentError = require('./errors/ArgumentError');
+
+function logAnalyzer(extensionManager, webService) {
+    /**
+     * @type {boolean}
+     */
+    let wasLastFileNameValid;
+
+    /**
+     * @return {boolean}
+     */
+    function getWasLastFileNameValid() {
+        return wasLastFileNameValid;
+    }
+
+    /**
+     * @param {string} fileName
+     * @return {Promise}
+     */
+    async function isValidLogFileName(fileName) {
+        wasLastFileNameValid = false;
+
+        if (fileName === '') {
+            throw new ArgumentError('filename has to be provided');
+        }
+
+        const result = await extensionManager.isValid(fileName);
+
+        if (!result) {
+            return false;
+        }
+
+        wasLastFileNameValid = true;
+        return true;
+    }
+
+    /**
+     * @param {string} fileName
+     */
+    function analyze(fileName) {
+        if (fileName.length < 8) {
+            webService.logError(`Filename too short: ${fileName}`);
+        }
+    }
+
+    return {
+        getWasLastFileNameValid,
+        isValidLogFileName,
+        analyze,
+    };
+}
+
+module.exports = logAnalyzer;