1c: Implemented FrameDecorator

ueb05_news_example/src/decorator/FrameDecorator.java

@@ -0,0 +1,43 @@
+package decorator;
+
+import model.Item;
+
+import java.util.Arrays;
+
+public class FrameDecorator extends StringDecorator {
+    public FrameDecorator(Item item) {
+        super(item);
+    }
+
+    public String getOverview() {
+        return wrapWithFrame(wrappee.getOverview());
+    }
+
+    public String getDetails() {
+        return wrapWithFrame(wrappee.getDetails());
+    }
+
+    public String getTitle() {
+        return wrapWithFrame(wrappee.getTitle());
+    }
+
+    private String wrapWithFrame(String content) {
+        String[] lines = content.split("\n");
+        int maxLength = Arrays.stream(lines).map(String::length).reduce(Integer::max).orElse(0);
+        StringBuilder builder = new StringBuilder();
+        builder.append("-".repeat(maxLength + 2)).append("\n");
+        for (String line : lines) {
+            int spaces = maxLength - line.length();
+            int leadingSpaces = spaces / 2;
+            int trailingSpaces = spaces - leadingSpaces;
+
+            builder.append("|")
+                    .append(" ".repeat(leadingSpaces))
+                    .append(line)
+                    .append(" ".repeat(trailingSpaces))
+                    .append("|\n");
+        }
+        builder.append("-".repeat(maxLength + 2)).append("\n");
+        return builder.toString();
+    }
+}