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Case Study: A Product Support Center
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new BufferedReader( new InputStreamReader(stream)); // Read and execute each line while (true) { if (interactive) Systemoutprint(PROMPT); String line = inreadLine(); if (line == null) break; // Parse and execute the command try { if (lineequals("quit")) break; else if (linestartsWith("get")) doGet(line); else if (linestartsWith("set")) doSet(line); else if (linestartsWith("customerSearch")) customerSearch(line); else if (linestartsWith("productSearch")) productSearch(line); else if (linestartsWith("productProblemsSearch")) productProblemsSearch(line); else if (linestartsWith("customerProblemsSearch")) customerProblemsSearch(line); else if (linestartsWith("problemLogSearch")) problemLogSearch(line); else if (linestartsWith("help")) help(); else if (linestartsWith("methods")) methods(); else if (linestartsWith("inc")) include(line); else if (linestartsWith("is")) doGet(line); else if (linestartsWith("connect"))
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doConnect(); else if (linestartsWith("disconnect")) doDisconnect(); else if (linestartsWith("newProblem")) doNewProblem(); // none of the above else Systemoutprintln ("Unrecognized command [" + line + "]"); } catch (Exception e) { eprintStackTrace(); } } inclose(); if (interactive) doDisconnect(); }
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The run() method opens a character line reader over the input stream and starts prompting for and executing commands The parser is a simple list of if statements that check for specific method names and call wrapper methods that execute them For commands beginning with get, is, or set Shell uses reflection to find the corresponding getter or setter methods in the model and invokes them If any errors are encountered, they re written to Systemout Here s the rest of the class, consisting of the methods that can be called from the main loop (listed alphabetically):
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/** * Invokes the customer problems search method */ protected void customerProblemsSearch(String line) throws Exception { String arg = getArgument(line); modelcustomerProblemsSearch(arg); } /**
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Case Study: A Product Support Center
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* Invokes the customer search method */ protected void customerSearch(String line) throws SQLException { String arg = getArgument(line); modelcustomerSearch(arg); } /** * Invokes the connect command */ protected void doConnect() { try { Systemoutprintln("Connecting"); modelconnect(); Systemoutprintln("Connected"); } catch (SQLException e) { Systemoutprintln(egetMessage()); } } /** * Invokes the disconnect command */ protected void doDisconnect() { Systemoutprintln("Disconnecting"); modeldisconnect(); Systemoutprintln("Disconnected"); } /** * Executes a "get" method */ protected void doGet(String line) throws Exception { if (!interactive) Systemoutprintln(line);
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// Get the read method name int p = lineindexOf("("); if (p == -1) p = linelength(); String readMethodName = linesubstring(0, p)trim(); // Lookup the read methods to see // if this one is found BeanInfo bi = IntrospectorgetBeanInfo(modelgetClass()); PropertyDescriptor[] pds = bigetPropertyDescriptors(); for (int i = 0; i < pdslength; i++) { PropertyDescriptor pd = pds[i]; Method method = pdgetReadMethod(); if (method != null) { String name = methodgetName(); if (nameequals(readMethodName)) { // This method is the read method // for this property // Invoke it and print the result Object[] args = {}; Object result = methodinvoke(model, args); Systemoutprintln(result); return; } } } throw new IllegalArgumentException ("No " + readMethodName + " method found"); } /** * Invokes the newProblem method */ protected void doNewProblem() throws Exception {
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Case Study: A Product Support Center
modelnewProblem(); Systemoutprintln(modelgetProblemID()); } /** * Executes a "set" method */ protected void doSet(String line) throws Exception { if (!interactive) Systemoutprintln(line); // Line should look like this: // // setSearchArgument("value") int p = lineindexOf("("); if (p == -1) throw new IllegalArgumentException ("No open parenthesis found"); int q = lineindexOf(")", p); if (q == -1) throw new IllegalArgumentException ("No close parenthesis found"); String writeMethodName = linesubstring(0, p); String argument = linesubstring(p+1, q)trim(); // Argument must be a quoted string if (!(argumentstartsWith("\"") && argumentendsWith("\""))) throw new IllegalArgumentException ("Argument must be a quoted string"); // Strip off the quotes argument = argumentsubstring(1, argumentlength()-1); // Find the set method and execute it BeanInfo bi = IntrospectorgetBeanInfo(modelgetClass());
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PropertyDescriptor[] pds = bigetPropertyDescriptors(); for (int i = 0; i < pdslength; i++) { PropertyDescriptor pd = pds[i]; Method method = pdgetWriteMethod(); if (method != null) { String name = methodgetName(); if (nameequals(writeMethodName)) { // This method is the write method // for this property Object[] args = { argument }; Object result = methodinvoke(model, args); return; } } } throw new IllegalArgumentException ("No " + writeMethodName + " method found"); } /** * Runs a subshell for the file specified in * the include statement * @param line an "include <path>/file" statement */ protected void include(String line) throws Exception { if (!interactive) Systemoutprintln(line); try { // Get the name of the file to be included StringTokenizer st = new StringTokenizer(line); stnextToken(); if (!sthasMoreTokens()) throw new IllegalArgumentException ("No file name specified for include"); String fileName = stnextToken();
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