BAEL-6227: fluent interfaces code
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emanuel.trandafir
parent
911df283d4
commit
e958c942d4
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package com.baeldung.fluentinterface;
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import static java.util.Arrays.stream;
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import static java.util.stream.Collectors.joining;
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public class HtmlDocument {
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private final String content;
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private HtmlDocument(String html) {
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this.content = html;
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}
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public HtmlDocument() {
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this("");
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}
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public String html() {
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return String.format("<html>%s</html>", content);
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}
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public HtmlDocument header(String header) {
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return new HtmlDocument(String.format("%s <h1>%s</h1>", content, header));
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}
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public HtmlDocument secondaryHeader(String header) {
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return new HtmlDocument(String.format("%s <h2>%s</h2>", content, header));
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}
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public HtmlDocument paragraph(String paragraph) {
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return new HtmlDocument(String.format("%s <p>%s</p>", content, paragraph));
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}
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public HtmlDocument horizontalLine() {
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return new HtmlDocument(String.format("%s <hr>", content));
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}
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public HtmlDocument orderedList(String... items) {
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String listItems = stream(items).map(el -> String.format("<li>%s</li>", el)).collect(joining());
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return new HtmlDocument(String.format("%s <ol>%s</ol>", content, listItems));
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}
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public HtmlDocument unorderedList(String... items) {
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String listItems = stream(items).map(el -> String.format("<li>%s</li>", el)).collect(joining());
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return new HtmlDocument(String.format("%s <ul>%s</ul>", content, listItems));
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}
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}
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package com.baeldung.fluentinterface;
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import com.baeldung.fluentinterface.components.HtmlElement;
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import com.baeldung.fluentinterface.components.HtmlHeader;
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import com.baeldung.fluentinterface.components.HtmlList;
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import static java.lang.String.format;
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import static java.util.Arrays.stream;
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import static java.util.stream.Collectors.joining;
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public class LargeHtmlDocument {
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private final String content;
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private LargeHtmlDocument(String html) {
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this.content = html;
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}
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public LargeHtmlDocument() {
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this("");
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}
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public String html() {
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return format("<html>%s</html>", content);
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}
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public LargeHtmlDocument head(HtmlElement head) {
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return new LargeHtmlDocument(format("%s <head>%s</head>", content, head.html()));
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}
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public LargeHtmlDocument body(HtmlElement body) {
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return new LargeHtmlDocument(format("%s <body>%s</body>", content, body.html()));
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}
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public LargeHtmlDocument footer(HtmlElement footer) {
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return new LargeHtmlDocument(format("%s <footer>%s</footer>", content, footer.html()));
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}
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private LargeHtmlDocument append(String html) {
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return new LargeHtmlDocument(format("%s %s", content, html));
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}
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}
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package com.baeldung.fluentinterface;
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public class User {
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private String firstName;
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private String lastName;
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private String email;
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private String username;
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private Long id;
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public String name() {
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return firstName + " " + lastName;
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}
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public User(String firstName, String lastName, String email, String username, Long id) {
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this.firstName = firstName;
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this.lastName = lastName;
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this.email = email;
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this.username = username;
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this.id = id;
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}
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public static Builder builder() {
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return new Builder();
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}
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public static class Builder {
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private String firstName;
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private String lastName;
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private String email;
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private String username;
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private Long id;
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private Builder() {
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}
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public Builder firstName(String firstName) {
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this.firstName = firstName;
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return this;
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}
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public Builder lastName(String lastName) {
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this.lastName = lastName;
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return this;
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}
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public Builder email(String email) {
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this.email = email;
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return this;
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}
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public Builder username(String username) {
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this.username = username;
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return this;
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}
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public Builder id(Long id) {
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this.id = id;
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return this;
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}
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public User build() {
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return new User(firstName, lastName, email, username, id);
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}
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}
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}
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package com.baeldung.fluentinterface.components;
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public class HorizontalLine implements HtmlElement {
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@Override
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public String html() {
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return "<hr>";
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}
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}
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package com.baeldung.fluentinterface.components;
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public class HtmlDiv implements HtmlElement {
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private final String content;
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public HtmlDiv(String content) {
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this.content = content;
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}
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public HtmlDiv() {
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this.content = "";
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}
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public HtmlDiv append(HtmlElement element) {
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return new HtmlDiv(content + element.html());
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}
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public HtmlDiv text(String text) {
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return new HtmlDiv(content + text);
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}
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public HtmlDiv paragraph(String text) {
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return new HtmlDiv(content + text);
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}
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@Override
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public String html() {
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return String.format("<div>%s</div>", content);
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}
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}
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package com.baeldung.fluentinterface.components;
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public interface HtmlElement {
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String html();
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}
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package com.baeldung.fluentinterface.components;
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public class HtmlHeader implements HtmlElement {
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private final Type type;
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private final String value;
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public HtmlHeader(Type type, String value) {
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this.type = type;
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this.value = value;
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}
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@Override
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public String html() {
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return String.format("<%s>%s</%s>", type.tag(), value, type.tag());
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}
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public enum Type {
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PRIMARY("h1"),
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SECONDARY("h2"),
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THIRD("h3"),
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FOURTH("h4");
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private final String tag;
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Type(String tag) {
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this.tag = tag;
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}
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public String tag() {
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return tag;
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}
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}
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}
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package com.baeldung.fluentinterface.components;
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import java.util.Arrays;
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import java.util.List;
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import static java.lang.String.format;
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import static java.util.stream.Collectors.joining;
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public class HtmlList implements HtmlElement {
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private final Type type;
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private final List<String> items;
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public HtmlList(Type type, String... items) {
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this.type = type;
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this.items = Arrays.asList(items);
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}
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@Override
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public String html() {
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String listItems = items.stream().map(el -> format("<li>%s</li>", el)).collect(joining());
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return String.format("<%s>%s</%s>", type.tag(), listItems, type.tag());
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}
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public enum Type {
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ORDERED("ol"),
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UNORDERED("ul");
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private final String tag;
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Type(String tag) {
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this.tag = tag;
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}
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public String tag() {
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return tag;
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}
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}
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}
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package com.baeldung.fluentinterface.components;
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public class HtmlSpan implements HtmlElement {
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private final String content;
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public HtmlSpan(String content) {
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this.content = content;
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}
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public HtmlSpan() {
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this.content = "";
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}
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public HtmlSpan append(HtmlElement element) {
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return new HtmlSpan(content + element.html());
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}
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public HtmlSpan paragraph(String text) {
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return new HtmlSpan(content + text);
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}
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@Override
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public String html() {
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return String.format("<span>%s</span>", content);
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}
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}
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package com.baeldung.fluentinterface;
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import com.baeldung.fluentinterface.components.*;
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import com.baeldung.fluentinterface.components.HtmlHeader.Type;
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import org.junit.jupiter.api.Test;
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import java.util.stream.Collectors;
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import java.util.stream.Stream;
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import static com.baeldung.fluentinterface.components.HtmlList.Type.ORDERED;
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import static org.assertj.core.api.Assertions.assertThat;
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class FluentInterfaceUnitTest {
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@Test
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void givenTenNumbers_thenStreamIsProcessedCorrectly() {
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Stream<Integer> numbers = Stream.of(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
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Stream<String> processedNumbers = numbers.distinct()
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.filter(nr -> nr % 2 == 0)
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.skip(1)
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.limit(4)
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.map(nr -> "#" + nr)
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.peek(nr -> System.out.println(nr));
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String result = processedNumbers.collect(Collectors.joining(", "));
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assertThat(result).isEqualTo("#2, #4, #6, #8");
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}
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@Test
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void givenUserBuilder_thenCreateUserCorrectly() {
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User.Builder userBuilder = User.builder();
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userBuilder = userBuilder
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.firstName("John")
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.lastName("Doe")
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.email("jd@gmail.com")
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.username("jd_2000")
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.id(1234L);
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User user = userBuilder.build();
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assertThat(user.name()).isEqualTo("John Doe");
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}
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@Test
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void givenHtmlDocument_thenGenerateHtmlCorrectly() {
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HtmlDocument document = new HtmlDocument()
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.header("Principles of O.O.P.")
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.paragraph("OOP in Java.")
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.horizontalLine()
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.paragraph("The main pillars of OOP are:")
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.orderedList("Encapsulation", "Inheritance", "Abstraction", "Polymorphism");
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String html = document.html();
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assertThat(html).isEqualToIgnoringWhitespace(
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"<html>"
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+ "<h1>Principles of O.O.P.</h1>"
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+ "<p>OOP in Java.</p>"
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+ "<hr>"
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+ "<p>The main pillars of OOP are:</p>"
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+ "<ol>"
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+ "<li>Encapsulation</li>"
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+ "<li>Inheritance</li>"
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+ "<li>Abstraction</li>"
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+ "<li>Polymorphism</li>"
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+ "</ol>"
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+ "</html>"
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);
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}
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@Test
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void givenHtmlDocument_thenInstanceIsImmutable() {
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HtmlDocument document = new HtmlDocument()
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.header("Principles of O.O.P.");
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HtmlDocument updatedDocument = document
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.paragraph("OOP in Java.");
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assertThat(document).isNotEqualTo(updatedDocument);
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}
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@Test
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void givenLargeHtmlDocument_thenGenerateHtmlCorrectly() {
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String html = new LargeHtmlDocument()
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.head(new HtmlHeader(Type.PRIMARY, "title"))
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.body(new HtmlDiv()
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.append(new HtmlSpan()
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.paragraph("learning OOP from John Doe")
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.append(new HorizontalLine())
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.paragraph("The pillars of OOP:")
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)
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.append(new HtmlList(ORDERED, "Encapsulation", "Inheritance", "Abstraction", "Polymorphism"))
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)
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.footer(new HtmlDiv()
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.paragraph("trademark John Doe")
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)
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.html();
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String expectedHtml = "<html> <head><h1>title</h1></head> <body><div><span>learning OOP from John Doe<hr>The pillars of OOP:</span><ol><li>Encapsulation</li><li>Inheritance</li><li>Abstraction</li><li>Polymorphism</li></ol></div></body> <footer><div>trademark John Doe</div></footer></html>";
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assertThat(html).isEqualToIgnoringWhitespace(expectedHtml);
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}
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}
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