started on visitor pattern

src/uebung08/doc/Book.java

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+package uebung08.doc;
+
+import java.util.List;
+
+public class Book {
+
+    private String title;
+    private String author;
+
+    List<TextComponent> content;
+
+    public Book(String author, String title, List<TextComponent> content) {
+        this.author = author;
+        this.title = title;
+        this.content = content;
+    }
+
+    public int countWords() {
+        int wordcount = 0;
+        for (TextComponent textComponent : content) {
+            wordcount += textComponent.countWords();
+        }
+        return wordcount;
+    }
+
+    public String toText() {
+        return "";
+    }
+
+    public String tableOfContents() {
+        return "";
+    }
+
+    public int countWordsByVisitor() {
+        return 0;
+    }
+}

src/uebung08/doc/BookDemo.java

@@ -0,0 +1,148 @@
+package uebung08.doc;
+
+import java.util.List;
+
+public class BookDemo {
+    private static final String TEXT0 = "Über Entwurf und Realisierung eierlegender Wollmilchsäue.";
+    private static final String TEXT1 = "Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod " +
+                                        "tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. " +
+                                        "At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd " +
+                                        "gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum " +
+                                        "dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor " +
+                                        "invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.";
+    private static final String TEXT2 = "Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie " +
+                                        "consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan " +
+                                        "et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis " +
+                                        "dolore te feugait nulla facilisi. Lorem ipsum dolor sit amet, consectetuer " +
+                                        "adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore " +
+                                        "magna aliquam erat volutpat.";
+    private static final String TEXT3 = "Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit " +
+                                        "lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure " +
+                                        "dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore " +
+                                        "eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim " +
+                                        "qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla " +
+                                        "facilisi.";
+    private static final String TEXT4 = "Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming " +
+                                        "id quod mazim placerat facer possim assum. Lorem ipsum dolor sit amet, " +
+                                        "consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet " +
+                                        "dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud " +
+                                        "exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo " +
+                                        "consequat.";
+    private static final String TEXT5 = "Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie " +
+                                        "consequat, vel illum dolore eu feugiat nulla facilisis.";
+    private static final String TEXT6 = "At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, " +
+                                        "no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, " +
+                                        "consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et " +
+                                        "dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo " +
+                                        "duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est " +
+                                        "Lorem ipsum dolor sit amet.";
+    private static final String TEXT7 = "Consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore " +
+                                        "et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et " +
+                                        "justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata " +
+                                        "sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur " +
+                                        "sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore " +
+                                        "magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo " +
+                                        "dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est " +
+                                        "Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing " +
+                                        "elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam " +
+                                        "erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea " +
+                                        "rebum. Stet clita kasd gubergren, no sea takimata sanctus.";
+    private static final String TEXT8 = "Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy " +
+                                        "eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam " +
+                                        "voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet " +
+                                        "clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit " +
+                                        "amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam " +
+                                        "nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed " +
+                                        "diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet " +
+                                        "clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. ";
+    private static final String TEXT9 = "Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie " +
+                                        "consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan " +
+                                        "et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis " +
+                                        "dolore te feugait nulla facilisi. Lorem ipsum dolor sit amet, consectetuer " +
+                                        "adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore " +
+                                        "magna aliquam erat volutpat.";
+    private static final String TEXT10 = "Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit " +
+                                         "lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure " +
+                                         "dolor in hendrerit in vulputate velit esse molestie consequat, vel illum " +
+                                         "dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio " +
+                                         "dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te " +
+                                         "feugait nulla facilisi.";
+    private static final String TEXT11 = "Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet " +
+                                         "doming id quod mazim placerat facer possim assum. Lorem ipsum dolor sit amet, " +
+                                         "consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut " +
+                                         "laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, " +
+                                         "quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex " +
+                                         "ea commodo";
+    private static final String TEXT12 = "Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy " +
+                                         "eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam " +
+                                         "voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet " +
+                                         "clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit " +
+                                         "amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam " +
+                                         "nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed " +
+                                         "diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet " +
+                                         "clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.";
+    private static final String TEXT13 = "Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy " +
+                                         "eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam " +
+                                         "voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita " +
+                                         "kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.";
+    private static final String TEXT14 = "At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, " +
+                                         "no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit " +
+                                         "amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut " +
+                                         "labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam " +
+                                         "et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata " +
+                                         "sanctus est Lorem ipsum dolor sit amet.";
+    private static final String TEXT15 = "Lorem ipsum dolor sit amet, consetetur sadipscing " +
+                                         "elitr, At accusam aliquyam diam diam dolore dolores duo eirmod eos erat, et " +
+                                         "nonumy sed tempor et et invidunt justo labore Stet clita ea et gubergren, kasd " +
+                                         "magna no rebum. sanctus sea sed takimata ut vero voluptua. est Lorem ipsum " +
+                                         "dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed " +
+                                         "diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat.";
+
+    public static void main(String[] args) {
+        final Book book = makeBook();
+
+        // Aufgabe 1
+        System.out.println("Buch enthält " + book.countWords() + " Wörter");
+
+        // Aufgabe 2
+        System.out.println("Buch enthält " + book.countWordsByVisitor() + " Wörter");
+        System.out.println("Inhalt: " + book.tableOfContents());
+        System.out.println(book.toText());
+    }
+
+    private static Book makeBook() {
+        final Section sec1 = new Section("Einführung",
+                                         List.of(new Paragraph(TEXT1),
+                                                 new Paragraph(TEXT2)));
+        final Section sec2 = new Section("Hintergrund",
+                                         List.of(new Paragraph(TEXT3),
+                                                 new Section("Geschichte",
+                                                             List.of(new Paragraph(TEXT4),
+                                                                     new Image("https://www.bekannt.de/p1.pdf",
+                                                                               "Bild 1"),
+                                                                     new Paragraph(TEXT5))),
+                                                 new Section("Literatur",
+                                                             List.of(new Paragraph(TEXT6),
+                                                                     new Image("https://www.eh-klar.de/p2.pdf",
+                                                                               "Bild 2"),
+                                                                     new Paragraph(TEXT7),
+                                                                     new Image("https://www.jeder-weiss-es.de/p3.pdf",
+                                                                               "Bild 3"),
+                                                                     new Paragraph(TEXT8)))));
+        final Section sec3 = new Section("Idee",
+                                         List.of(new Paragraph(TEXT9)));
+        final Section sec4 = new Section("Umsetzung",
+                                         List.of(new Paragraph(TEXT10),
+                                                 new Section("Entwurf",
+                                                             List.of(new Paragraph(TEXT11),
+                                                                     new Section("Grobentwurf",
+                                                                                 List.of(new Paragraph(TEXT12))),
+                                                                     new Section("Feinentwurf",
+                                                                                 List.of(new Paragraph(TEXT13))))),
+                                                 new Section("Realisierung",
+                                                             List.of(new Paragraph(TEXT14)))));
+        final Section sec5 = new Section("Zusammenfassung und Ausblick", List.of(new Paragraph(TEXT15)));
+        return new Book("Peter Mustermann", "Die eierlegende Wollmilchsau",
+                        List.of(new Paragraph(TEXT0), sec1, sec2, sec3, sec4, sec5));
+    }
+}

src/uebung08/doc/CountWordsVisitor.java

@@ -0,0 +1,11 @@
+package uebung08.doc;
+
+public class CountWordsVisitor implements Visitor<Integer>{
+    
+    
+    @Override
+    public <T> Integer visit(TextComponent textComponent) {
+        image.accept(this);
+        return 0;
+    }
+}

src/uebung08/doc/Image.java

@@ -0,0 +1,22 @@
+package uebung08.doc;
+
+public class Image implements TextComponent {
+
+    private String url;
+    private String caption;
+
+    public Image(String url, String caption) {
+        this.url = url;
+        this.caption = caption;
+    }
+
+    public int countWords() {
+        return 0;
+    }
+
+    @Override
+    public <T> boolean accept(CountWordsVisitor<T> visitor) {
+        return visitor.visit(this);
+    }
+
+}

src/uebung08/doc/Paragraph.java

@@ -0,0 +1,30 @@
+package uebung08.doc;
+
+public class Paragraph implements TextComponent {
+
+    private String text;
+
+    public Paragraph(String text) {
+        this.text = text;
+    }
+
+
+    public int countWords() {
+        int wordcount = 0;
+        boolean isInWord = false;
+
+
+        for (int i = 0; i < text.length(); i++) {
+            if(Character.isAlphabetic(text.charAt(i))){
+                if (!isInWord) {
+                    wordcount++;
+                    isInWord = true;
+                }
+            } else {
+                isInWord = false;
+            }
+        }
+
+        return wordcount;
+    }
+}

src/uebung08/doc/Section.java

@@ -0,0 +1,23 @@
+package uebung08.doc;
+
+import java.util.List;
+
+public class Section implements TextComponent {
+
+    private String header;
+    private List<TextComponent> content;
+
+    public Section(String header, List<TextComponent> content) {
+        this.header = header;
+        this.content = content;
+    }
+
+    public int countWords() {
+        int wordcount = 0;
+        for (TextComponent textComponent : content) {
+            wordcount += textComponent.countWords();
+        }
+        return wordcount;
+    }
+
+}

src/uebung08/doc/TextComponent.java

@@ -0,0 +1,7 @@
+package uebung08.doc;
+
+public interface TextComponent {
+    public int countWords();
+
+    public <T> boolean accept(Visitor<T> visitor);
+}

src/uebung08/doc/Visitor.java

@@ -0,0 +1,5 @@
+package uebung08.doc;
+
+public interface Visitor<T> {
+    T visit(TextComponent textComponent);
+}