BAEL-6227: fluent interfaces code

bradcode24 · Mar 12, 2023 · c3e6f4c · c3e6f4c
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diff --git a/...design-patterns-behavioral-2/src/main/java/com/baeldung/fluentinterface/HtmlDocument.java b/...design-patterns-behavioral-2/src/main/java/com/baeldung/fluentinterface/HtmlDocument.java
@@ -0,0 +1,46 @@
+package com.baeldung.fluentinterface;
+
+import static java.util.Arrays.stream;
+import static java.util.stream.Collectors.joining;
+
+public class HtmlDocument {
+	private final String content;
+
+	private HtmlDocument(String html) {
+		this.content = html;
+	}
+
+	public HtmlDocument() {
+		this("");
+	}
+
+	public String html() {
+		return String.format("<html>%s</html>", content);
+	}
+
+	public HtmlDocument header(String header) {
+		return new HtmlDocument(String.format("%s <h1>%s</h1>", content, header));
+	}
+
+	public HtmlDocument secondaryHeader(String header) {
+		return new HtmlDocument(String.format("%s <h2>%s</h2>", content, header));
+	}
+
+	public HtmlDocument paragraph(String paragraph) {
+		return new HtmlDocument(String.format("%s <p>%s</p>", content, paragraph));
+	}
+
+	public HtmlDocument horizontalLine() {
+		return new HtmlDocument(String.format("%s <hr>", content));
+	}
+
+	public HtmlDocument orderedList(String... items) {
+		String listItems = stream(items).map(el -> String.format("<li>%s</li>", el)).collect(joining());
+		return new HtmlDocument(String.format("%s <ol>%s</ol>", content, listItems));
+	}
+
+	public HtmlDocument unorderedList(String... items) {
+		String listItems = stream(items).map(el -> String.format("<li>%s</li>", el)).collect(joining());
+		return new HtmlDocument(String.format("%s <ul>%s</ul>", content, listItems));
+	}
+}
diff --git a/...n-patterns-behavioral-2/src/main/java/com/baeldung/fluentinterface/LargeHtmlDocument.java b/...n-patterns-behavioral-2/src/main/java/com/baeldung/fluentinterface/LargeHtmlDocument.java
@@ -0,0 +1,40 @@
+package com.baeldung.fluentinterface;
+
+import com.baeldung.fluentinterface.components.HtmlElement;
+import com.baeldung.fluentinterface.components.HtmlHeader;
+import com.baeldung.fluentinterface.components.HtmlList;
+
+import static java.lang.String.format;
+import static java.util.Arrays.stream;
+import static java.util.stream.Collectors.joining;
+
+public class LargeHtmlDocument {
+	private final String content;
+
+	private LargeHtmlDocument(String html) {
+		this.content = html;
+	}
+
+	public LargeHtmlDocument() {
+		this("");
+	}
+
+	public String html() {
+		return format("<html>%s</html>", content);
+	}
+
+	public LargeHtmlDocument head(HtmlElement head) {
+		return new LargeHtmlDocument(format("%s <head>%s</head>", content, head.html()));
+	}
+	public LargeHtmlDocument body(HtmlElement body) {
+		return new LargeHtmlDocument(format("%s <body>%s</body>", content, body.html()));
+	}
+	public LargeHtmlDocument footer(HtmlElement footer) {
+		return new LargeHtmlDocument(format("%s <footer>%s</footer>", content, footer.html()));
+	}
+
+	private LargeHtmlDocument append(String html) {
+		return new LargeHtmlDocument(format("%s %s", content, html));
+	}
+
+}
diff --git a/...modules/design-patterns-behavioral-2/src/main/java/com/baeldung/fluentinterface/User.java b/...modules/design-patterns-behavioral-2/src/main/java/com/baeldung/fluentinterface/User.java
@@ -0,0 +1,65 @@
+package com.baeldung.fluentinterface;
+
+public class User {
+	private String firstName;
+	private String lastName;
+	private String email;
+	private String username;
+	private Long id;
+
+	public String name() {
+		return firstName + " " + lastName;
+	}
+
+	public User(String firstName, String lastName, String email, String username, Long id) {
+		this.firstName = firstName;
+		this.lastName = lastName;
+		this.email = email;
+		this.username = username;
+		this.id = id;
+	}
+
+	public static Builder builder() {
+		return new Builder();
+	}
+
+	public static class Builder {
+		private String firstName;
+		private String lastName;
+		private String email;
+		private String username;
+		private Long id;
+
+		private Builder() {
+		}
+
+		public Builder firstName(String firstName) {
+			this.firstName = firstName;
+			return this;
+		}
+
+		public Builder lastName(String lastName) {
+			this.lastName = lastName;
+			return this;
+		}
+
+		public Builder email(String email) {
+			this.email = email;
+			return this;
+		}
+
+		public Builder username(String username) {
+			this.username = username;
+			return this;
+		}
+
+		public Builder id(Long id) {
+			this.id = id;
+			return this;
+		}
+
+		public User build() {
+			return new User(firstName, lastName, email, username, id);
+		}
+	}
+}
diff --git a/...ns-behavioral-2/src/main/java/com/baeldung/fluentinterface/components/HorizontalLine.java b/...ns-behavioral-2/src/main/java/com/baeldung/fluentinterface/components/HorizontalLine.java
@@ -0,0 +1,8 @@
+package com.baeldung.fluentinterface.components;
+
+public class HorizontalLine implements HtmlElement {
+	@Override
+	public String html() {
+		return "<hr>";
+	}
+}
diff --git a/...-patterns-behavioral-2/src/main/java/com/baeldung/fluentinterface/components/HtmlDiv.java b/...-patterns-behavioral-2/src/main/java/com/baeldung/fluentinterface/components/HtmlDiv.java
@@ -0,0 +1,29 @@
+package com.baeldung.fluentinterface.components;
+
+public class HtmlDiv implements HtmlElement {
+
+	private final String content;
+
+	public HtmlDiv(String content) {
+		this.content = content;
+	}
+
+	public HtmlDiv() {
+		this.content = "";
+	}
+
+	public HtmlDiv append(HtmlElement element) {
+		return new HtmlDiv(content + element.html());
+	}
+	public HtmlDiv text(String text) {
+		return new HtmlDiv(content + text);
+	}
+	public HtmlDiv paragraph(String text) {
+		return new HtmlDiv(content + text);
+	}
+
+	@Override
+	public String html() {
+		return String.format("<div>%s</div>", content);
+	}
+}
diff --git a/...terns-behavioral-2/src/main/java/com/baeldung/fluentinterface/components/HtmlElement.java b/...terns-behavioral-2/src/main/java/com/baeldung/fluentinterface/components/HtmlElement.java
@@ -0,0 +1,5 @@
+package com.baeldung.fluentinterface.components;
+
+public interface HtmlElement {
+	String html();
+}
diff --git a/...tterns-behavioral-2/src/main/java/com/baeldung/fluentinterface/components/HtmlHeader.java b/...tterns-behavioral-2/src/main/java/com/baeldung/fluentinterface/components/HtmlHeader.java
@@ -0,0 +1,34 @@
+package com.baeldung.fluentinterface.components;
+
+public class HtmlHeader implements HtmlElement {
+
+	private final Type type;
+	private final String value;
+
+	public HtmlHeader(Type type, String value) {
+		this.type = type;
+		this.value = value;
+	}
+
+	@Override
+	public String html() {
+		return String.format("<%s>%s</%s>", type.tag(), value, type.tag());
+	}
+
+	public enum Type {
+		PRIMARY("h1"),
+		SECONDARY("h2"),
+		THIRD("h3"),
+		FOURTH("h4");
+
+		private final String tag;
+
+		Type(String tag) {
+			this.tag = tag;
+		}
+
+		public String tag() {
+			return tag;
+		}
+	}
+}
diff --git a/...patterns-behavioral-2/src/main/java/com/baeldung/fluentinterface/components/HtmlList.java b/...patterns-behavioral-2/src/main/java/com/baeldung/fluentinterface/components/HtmlList.java
@@ -0,0 +1,39 @@
+package com.baeldung.fluentinterface.components;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static java.lang.String.format;
+import static java.util.stream.Collectors.joining;
+
+public class HtmlList implements HtmlElement {
+
+	private final Type type;
+	private final List<String> items;
+
+	public HtmlList(Type type, String... items) {
+		this.type = type;
+		this.items = Arrays.asList(items);
+	}
+
+	@Override
+	public String html() {
+		String listItems = items.stream().map(el -> format("<li>%s</li>", el)).collect(joining());
+		return String.format("<%s>%s</%s>", type.tag(), listItems, type.tag());
+	}
+
+	public enum Type {
+		ORDERED("ol"),
+		UNORDERED("ul");
+
+		private final String tag;
+
+		Type(String tag) {
+			this.tag = tag;
+		}
+
+		public String tag() {
+			return tag;
+		}
+	}
+}
diff --git a/...patterns-behavioral-2/src/main/java/com/baeldung/fluentinterface/components/HtmlSpan.java b/...patterns-behavioral-2/src/main/java/com/baeldung/fluentinterface/components/HtmlSpan.java
@@ -0,0 +1,27 @@
+package com.baeldung.fluentinterface.components;
+
+public class HtmlSpan implements HtmlElement {
+
+	private final String content;
+
+	public HtmlSpan(String content) {
+		this.content = content;
+	}
+
+	public HtmlSpan() {
+		this.content = "";
+	}
+
+	public HtmlSpan append(HtmlElement element) {
+		return new HtmlSpan(content + element.html());
+	}
+
+	public HtmlSpan paragraph(String text) {
+		return new HtmlSpan(content + text);
+	}
+
+	@Override
+	public String html() {
+		return String.format("<span>%s</span>", content);
+	}
+}