1    /* 
2     * Program featuring an array to store and interactively manipulate a list of words. 
3     */
4    package arraylistplay;
5    
6    import java.io.File;
7    import java.io.FileNotFoundException;
8    import java.io.IOException;
9    import java.util.Scanner;
10   import java.util.ArrayList;
11   
12   public class WordList {
13       // VARIABLES LOCAL TO THE CLASS, AND HENCE GLOBAL TO THE METHODS
14       private static final int LIMIT = 1000;
15       private static ArrayList <String> words = new ArrayList<>(LIMIT);
16       private static int numberOfWords = 0;
17       private static Scanner commandReader = new Scanner(System.in);
18   
19       public static void main(String[] args) {
20           try {
21               // ESTABLISH THE ARRAY OF Words
22               readWords();
23               // CHECK THE DATA
24               // System.out.println("\nThe original list of words ...");
25               // displayWords();
26               // ENTER THE INTERPRETER
27               interpreter();
28           } catch (IOException ex) {
29               System.out.println("The file was not found. Please think again.");
30               System.exit(-1);
31           }
32       }
33   
34       //Make Compatible with my windows computer
35       public static String pathBuilder(){
36           String separator = System.getProperty("file.separator");
37           String home = null;
38   
39           //Make Program Compatible With Windows (I use windows :P )
40           if(System.getProperty("os.name").startsWith("Windows")) {
41               home = System.getProperty("user.dir");
42           }
43           else if(System.getProperty("os.name").startsWith("Windows 10")) {
44               home = System.getProperty("user.dir");
45           }
46           else {
47               home = System.getProperty("user.home");
48           }
49           String path = home + separator + "CS1Files" + separator + "data" + separator;
50           return path;
51       }
52   
53   
54       // Assuming that the data file will be found in the public_html/data
55       // subdirectory of the user’s home directory.
56       private static Scanner establishScanner(String fn, String path) throws FileNotFoundException {
57           String fullFileName = path + fn;
58           return new Scanner(new File(fullFileName));
59       }
60   
61       private static void readWords() throws FileNotFoundException {
62           Scanner scanner = establishScanner("WordSet.txt",pathBuilder());
63           while( scanner.hasNext()) {
64               words.add(scanner.next());
65               numberOfWords = numberOfWords + 1;
66           }
67   
68       }
69   
70       private static void displayWords() {
71           for (int x = 0; x < numberOfWords; x = x + 1) {
72               System.out.println(words.get(x));
73           }
74       }
75   
76       private static void interpreter(){
77           System.out.print(">>> ");
78           String command = commandReader.next();
79           if (command.equalsIgnoreCase("DISPLAY")) {
80               interpreterDisplayCommand();
81           } else if (command.equalsIgnoreCase("PRINT")) {
82               interpretPrintCommand();
83           } else if (command.equalsIgnoreCase("SWAP")) {
84               interpretSwapCommand();
85           } else if (command.equalsIgnoreCase("ADD")) {
86               interpretAddCommand();
87           } else if (command.equalsIgnoreCase("HELP")) {
88               interpretHelpCommand();
89           } else if(command.equalsIgnoreCase("CLEAR")) {
90               interpretClearCommand();
91           } else if(command.equalsIgnoreCase("LS")) {
92               interpretListCommand(pathBuilder());
93           } else if (command.equalsIgnoreCase("EXIT")) {
94               System.exit(0);
95           } else {
96               System.out.println("### Unrecognizable command: " + command);
97           }
98           interpreter();
99       }
100  
101      private static void interpreterDisplayCommand() {
102          displayWords();
103      }
104  
105      private static void interpretPrintCommand() {
106          String operand = commandReader.next();
107          if (operand.equalsIgnoreCase("FIRST")) {
108              System.out.println(words.get(0));
109          } else if (operand.equalsIgnoreCase("LAST")) {
110              System.out.println(words.get(numberOfWords - 1));
111          } else {
112              int index = Integer.valueOf(operand);
113              System.out.println(words.get(index - 1));
114          }
115      }
116  
117      private static void interpretHelpCommand() {
118          System.out.println("HELP - display a menu of commands");
119          System.out.println("DISPLAY - display the list of words");
120          System.out.println("PRINT - print a String (FIRST;LAST;nth)");
121          System.out.println("SWAP - exchange two elements (nth;mth)");
122          System.out.println("ADD - add a word to the list (FIRST;LAST)");
123          System.out.println("CLEAR - clears the console");
124          System.out.println("LS - lists file in data directory");
125          System.out.println("EXIT - terminate execution of the program");
126      }
127  
128      private static void interpretSwapCommand() {
129          int position1 = commandReader.nextInt() -1; // subtraction of 1 so we won't have to use "exact" values as index input
130          int position2 = commandReader.nextInt() -1;
131          words.set(position1, words.set(position2 , words.get(position1))); // swapping is here
132      }
133  
134      private static void interpretAddCommand() {
135          String position = commandReader.next();
136          if (position.equalsIgnoreCase("LAST")) {
137              addLast();
138          } else if (position.equalsIgnoreCase("FIRST")) {
139              addFirst();
140          } else {
141              System.out.println("### invalid operand for add command");
142          }
143          numberOfWords = numberOfWords + 1;
144      }
145  
146  
147      private static void interpretClearCommand(){
148          int intelliJConsoleHistorySize = 300;
149  
150          for (int i = 0; i < intelliJConsoleHistorySize;++i) {
151              System.out.println();
152  
153          }
154      }
155  
156      private static void interpretListCommand(String path){
157          File dataFolder = new File(path);
158          File[] listOfFiles = dataFolder.listFiles();
159          for( File element: listOfFiles) {
160              System.out.println(element);
161          }
162      }
163      
164      private static void addLast() {
165         words.add(commandReader.next()); 
166      }
167  
168      private static void addFirst() {
169          for (int x = numberOfWords; x > 0; x = x - 1) {
170              words.get(x - 1);
171          }
172          words.add(0, commandReader.next());
173      }
174  }