Solved Task 2

src/ch/zhaw/ads/ADS1_3_test.java

@@ -32,5 +32,8 @@ public class ADS1_3_test {
         //new Tests:
         test("(",false);
         test(")",false);
+
+        test("<(<>)>",true);
+        test("<(<)>>",false);
     }
 }

src/ch/zhaw/ads/BracketServer.java

@@ -1,7 +1,18 @@
 package ch.zhaw.ads;
 
+import org.junit.platform.engine.support.discovery.SelectorResolver;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
 public class BracketServer implements CommandExecutor {
 
+    private final String openingBracketRegex = "((\\()|(\\[)|(\\{)|(<)|(/\\*))";
+    private final String closingBracketRegex = "((\\))|(\\])|(\\})|(>)|(\\*/))";
+
+    private final Pattern openingBracketPattern = Pattern.compile(openingBracketRegex);
+    private final Pattern closingBracketPattern = Pattern.compile(closingBracketRegex);
+    private final Pattern BracketPattern = Pattern.compile(openingBracketRegex + "|" + closingBracketRegex);
 
 
     @Override
@@ -11,14 +22,19 @@ public class BracketServer implements CommandExecutor {
 
     public boolean checkBrackets (String arg) {
         Stack stack = new ListStack();
-        char[] chars = arg.toCharArray();
+        StringBuilder builder = new StringBuilder(arg);
-        for (char x: chars) {
+        Matcher bracketMatcher = BracketPattern.matcher(builder.toString());
-            Character closingBracket = getClosingBracketForOpening(x);
+        while (builder.toString().length() > 0 && bracketMatcher.find()) {
+            String foundString = bracketMatcher.group();
+            String closingBracket = getClosingBracketForOpening(foundString);
+            Matcher closingBracketMatcher = closingBracketPattern.matcher(foundString);
             if(closingBracket != null){
                 stack.push(closingBracket);
-            } else if(isClosingBracket(x) && stack.pop() != (Character)x) {
+            } else if((closingBracketMatcher.matches()) && !foundString.equals(stack.pop())) {
                 return false;
             }
+            builder = new StringBuilder(builder.substring(bracketMatcher.end()));
+            bracketMatcher = BracketPattern.matcher(builder.toString());
         }
         if(stack.isEmpty()){
             return true;
@@ -27,20 +43,20 @@ public class BracketServer implements CommandExecutor {
         }
     }
 
-    private Character getClosingBracketForOpening(char openingBracket) {
+    private String getClosingBracketForOpening(String openingBracket) {
         switch (openingBracket){
-            case '(':
+            case "(":
-                return ')';
+                return ")";
-            case '[':
+            case "[":
-                return ']';
+                return "]";
-            case '{':
+            case "{":
-                return '}';
+                return "}";
+            case "<":
+                return ">";
+            case "/*":
+                return "*/";
         }
         return null;
     }
 
-    private boolean isClosingBracket(char x) {
-        return x == ')' || x == ']' || x == '}';
-    }
-
 }