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Felix Steghofer
2022-12-04 01:25:28 +01:00
commit 3db4f94e6a
31 changed files with 2762 additions and 0 deletions
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Tries/Shell.java Normal file
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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
/**
* Main Class for the Student-Administration.<br />
* The user types commands and parameters to manipulate or change
* the Trie. <br />Commands are found with the HELP command
*/
final class Shell {
private Shell() { }
/**
* Checks if <code>string</code> consists of only chars.
* @param string String to check
* @return <code>true</code>, if <code>string</code> has only chars<br />
* <code>false</code>, if <code>string</code> has other signs
*/
private static boolean isCharString(String string) {
for (int j = 0; j < string.length(); j++) {
if (string.charAt(j) - 'a' < 0
|| string.charAt(j) - 'a' > 25) {
return false;
}
}
return true;
}
/**
* Main method for the Student Administration including the Shell.
* Validation for input.
* @param args are not handled at the moment
* @throws IOException
*/
public static void main(String[] args) throws IOException {
Trie t = new Trie();
boolean runtime = true;
BufferedReader br = new BufferedReader(
new InputStreamReader(System.in));
while (runtime) {
System.out.print("trie> ");
String input = br.readLine();
String[] splited = input.split(" ");
char ch = splited[0].charAt(0);
ch = Character.toLowerCase(ch);
try {
switch(ch) {
case 'n' :
if (splited.length != 1) {
System.out.println("Error! Wrong Parameter! "
+ "check HELP");
break;
}
t = new Trie();
break;
case 'a' :
if (splited.length != 3) {
System.out.println("Error! Wrong Parameter! "
+ "check HELP");
break;
}
if (!isCharString(splited[1])) {
System.out.println("Error! Wrong Parameter! "
+ "check HELP");
break;
}
if (Integer.parseInt(splited[2]) < 0) {
System.out.println("Error! Wrong Parameter! "
+ "check HELP");
break;
}
if (!t.add(splited[1], Integer.parseInt(splited[2]))) {
System.out.println("Error! " + splited[1]
+ " is already present.");
}
break;
case 'c' :
if (splited.length != 3) {
System.out.println("Error! Wrong Parameter! "
+ "check HELP");
break;
}
if (!isCharString(splited[1])) {
System.out.println("Error! Wrong Parameter! "
+ "check HELP");
break;
}
if (Integer.parseInt(splited[2]) < 0) {
System.out.println("Error! Wrong Parameter! "
+ "check HELP");
break;
}
if (!t.change(splited[1], Integer.parseInt(splited[2]))) {
System.out.println("Error! " + splited[1]
+ " does not yet exist");
}
break;
case 'd' :
if (splited.length != 2) {
System.out.println("Error! Wrong Parameter! "
+ "check HELP");
break;
}
if (!isCharString(splited[1])) {
System.out.println("Error! Wrong Parameter! "
+ "check HELP");
break;
}
if (!t.delete(splited[1])) {
System.out.println("Error! " + splited[1]
+ " does not yet exist");
}
break;
case 'p' :
if (splited.length != 2) {
System.out.println("Error! Wrong Parameter! "
+ "check HELP");
break;
}
if (!isCharString(splited[1])) {
System.out.println("Error! Wrong Parameter! "
+ "check HELP");
break;
}
if (t.points(splited[1]) != null) {
System.out.println(t.points(splited[1]));
} else {
System.out.println("Error! " + splited[1]
+ " does not yet exist");
}
break;
case 't' :
if (splited.length != 1) {
System.out.println("Error! Wrong Parameter! "
+ "check HELP");
break;
}
System.out.println(t.toString());
break;
case 'h' :
if (splited.length != 1) {
System.out.println("Error! Wrong Parameter! "
+ "check HELP");
break;
}
System.out.println("NEW Creates a new empty Trie ");
System.out.println("ADD adds <name> with <points>");
System.out.println("CHANGE change <points> of <name>");
System.out.println("DELETE deletes <name>");
System.out.println("POINTS displays points of <name>");
System.out.println("TRIE displays hole Trie");
System.out.println("HELP display this help");
System.out.println("QUIT exit Shell");
break;
case 'q' :
if (splited.length != 1) {
System.out.println("Error! Wrong Parameter! check HELP");
break;
}
runtime = false;
break;
default :
System.out.println("Error! Wrong command check HELP");
}
} catch (NumberFormatException e) {
System.out.println("Error! Wrong Parameter! check HELP");
}
}
}
}