BAEL-3091: The Prototype Pattern in Java (changed code based on valid comments from a reader)

spring-thymeleaf-2/src/main/java/com/baeldung/thymeleaf/Application.java

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+package com.baeldung.thymeleaf;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+}

spring-thymeleaf-2/src/main/java/com/baeldung/thymeleaf/ThymeleafConfig.java

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+package com.baeldung.thymeleaf;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.thymeleaf.templatemode.TemplateMode;
+import org.thymeleaf.templateresolver.ClassLoaderTemplateResolver;
+
+@Configuration
+public class ThymeleafConfig {
+
+    @Bean
+    public ClassLoaderTemplateResolver secondaryTemplateResolver() {
+        ClassLoaderTemplateResolver secondaryTemplateResolver = new ClassLoaderTemplateResolver();
+        secondaryTemplateResolver.setPrefix("templates-2/");
+        secondaryTemplateResolver.setSuffix(".html");
+        secondaryTemplateResolver.setTemplateMode(TemplateMode.HTML);
+        secondaryTemplateResolver.setCharacterEncoding("UTF-8");
+        secondaryTemplateResolver.setOrder(1);
+        secondaryTemplateResolver.setCheckExistence(true);
+
+        return secondaryTemplateResolver;
+    }
+}

spring-thymeleaf-2/src/main/java/com/baeldung/thymeleaf/controller/ParticipantController.java

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+package com.baeldung.thymeleaf.controller;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+import java.util.List;
+
+import static java.util.Arrays.asList;
+
+@Controller
+public class ParticipantController {
+
+    @RequestMapping("/participants")
+    public String index(
+            @RequestParam(value = "participant", required = false) String participant,
+            @RequestParam(value = "country", required = false) String country,
+            @RequestParam(value = "action", required = false) String action,
+            @RequestParam(value = "id", required = false) Integer id,
+            Model model
+    ) {
+        model.addAttribute("id", id);
+        List<Integer> userIds = asList(1,2,3,4);
+        model.addAttribute("userIds", userIds);
+        return "participants";
+    }
+}

spring-thymeleaf-2/src/main/java/com/baeldung/thymeleaf/enums/Color.java

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+package com.baeldung.thymeleaf.enums;
+
+public enum Color {
+    BLACK("Black"), 
+    BLUE("Blue"), 
+    RED("Red"), 
+    YELLOW("Yellow"), 
+    GREEN("Green"),
+    ORANGE("Orange"), 
+    PURPLE("Purple"), 
+    WHITE("White");
+    
+    private final String displayValue;
+    
+    private Color(String displayValue) {
+        this.displayValue = displayValue;
+    }
+    
+    public String getDisplayValue() {
+        return displayValue;
+    }
+}

spring-thymeleaf-2/src/main/java/com/baeldung/thymeleaf/enums/Widget.java

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+package com.baeldung.thymeleaf.enums;
+
+public class Widget {
+    private String name;
+    private Color color;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Color getColor() {
+        return color;
+    }
+
+    public void setColor(Color color) {
+        this.color = color;
+    }
+
+    @Override
+    public String toString() {
+        return "Widget [name=" + name + ", color=" + color + "]";
+    }
+}

spring-thymeleaf-2/src/main/java/com/baeldung/thymeleaf/enums/WidgetController.java

@@ -0,0 +1,23 @@
+package com.baeldung.thymeleaf.enums;
+
+import javax.validation.Valid;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.ui.Model;
+
+@Controller
+public class WidgetController {
+    @GetMapping("/widget/add")
+    public String addWidget(@ModelAttribute Widget widget) {
+        return "enums/new";
+    }
+    
+    @PostMapping("/widget/add")
+    public String saveWidget(@Valid Widget widget, Model model) {
+        model.addAttribute("widget", widget);
+        return "enums/view";
+    }
+}

spring-thymeleaf-2/src/main/java/com/baeldung/thymeleaf/lists/ListsController.java

@@ -0,0 +1,64 @@
+package com.baeldung.thymeleaf.lists;
+
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.List;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@Controller
+@RequestMapping("/lists")
+public class ListsController {
+
+    @GetMapping("/toList")
+    public String usingToList(Model model) {
+        List<String> colors = getColors();
+        String[] colorsArray = colors.toArray(new String[0]);
+        model.addAttribute("myArray", colorsArray);
+        return "lists/toList";
+    }
+
+    @GetMapping("/contains")
+    public String usingContains(Model model) {
+        model.addAttribute("myList", getColors());
+        model.addAttribute("others", getOtherColors());
+        return "lists/contains";
+    }
+
+    @GetMapping("/size")
+    public String usingSize(Model model) {
+        model.addAttribute("myList", getColors());
+        return "lists/size";
+    }
+
+    @GetMapping("/isEmpty")
+    public String usingIsEmpty(Model model) {
+        model.addAttribute("myList", getColors());
+        return "lists/isEmpty";
+    }
+
+    @GetMapping("/sort")
+    public String usingSort(Model model) {
+        model.addAttribute("myList", getColors());
+        model.addAttribute("reverse", Comparator.reverseOrder());
+        return "lists/sort";
+    }
+
+    private List<String> getColors() {
+        List<String> colors = new ArrayList<>();
+        colors.add("green");
+        colors.add("yellow");
+        colors.add("red");
+        colors.add("blue");
+        return colors;
+    }
+
+    private List<String> getOtherColors() {
+        List<String> colors = new ArrayList<>();
+        colors.add("green");
+        colors.add("blue");
+        return colors;
+    }
+}

spring-thymeleaf-2/src/main/java/com/baeldung/thymeleaf/pathvariables/Detail.java

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+package com.baeldung.thymeleaf.pathvariables;
+
+public class Detail {
+    private int id;
+    private String description;
+    
+    public Detail(int id, String description) {
+        super();
+        this.id = id;
+        this.description = description;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }    
+}

spring-thymeleaf-2/src/main/java/com/baeldung/thymeleaf/pathvariables/Item.java

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+package com.baeldung.thymeleaf.pathvariables;
+
+import java.util.List;
+
+public class Item {
+    private int id;
+    private String name;
+    private List<Detail> details;
+
+    public Item(int id, String name) {
+        super();
+        this.id = id;
+        this.name = name;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public List<Detail> getDetails() {
+        return details;
+    }
+
+    public void setDetails(List<Detail> details) {
+        this.details = details;
+    }
+}

spring-thymeleaf-2/src/main/java/com/baeldung/thymeleaf/pathvariables/PathVariablesController.java

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+package com.baeldung.thymeleaf.pathvariables;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+
+@Controller
+public class PathVariablesController {
+    private List<Item> items = new ArrayList<Item>();
+    
+    public PathVariablesController() {
+        Item item1 = new Item(1, "First Item");
+        List<Detail> item1Details = new ArrayList<>();
+        item1Details.add(new Detail(1, "Green"));
+        item1Details.add(new Detail(2, "Large"));
+        item1.setDetails(item1Details);
+        items.add(item1);
+        
+        Item item2 = new Item(2, "Second Item");
+        List<Detail> item2Details = new ArrayList<>();
+        item2Details.add(new Detail(1, "Red"));
+        item2Details.add(new Detail(2, "Medium"));
+        item2.setDetails(item2Details);
+        items.add(item2);
+    }
+
+    @GetMapping("/pathvars")
+    public String start(Model model) {        
+        model.addAttribute("items", items);
+        return "pathvariables/index";
+    }
+    
+    @GetMapping("/pathvars/single/{id}")
+    public String singlePathVariable(@PathVariable("id") int id, Model model) {
+        if (id == 1) {
+            model.addAttribute("item", new Item(1, "First Item"));
+        } else {
+            model.addAttribute("item", new Item(2, "Second Item"));
+        }
+        
+        return "pathvariables/view";
+    }
+    
+    @GetMapping("/pathvars/item/{itemId}/detail/{detailId}")
+    public String multiplePathVariable(@PathVariable("itemId") int itemId, @PathVariable("detailId") int detailId, Model model) {
+        for (Item item : items) {
+            if (item.getId() == itemId) {
+                model.addAttribute("item", item);
+                for (Detail detail : item.getDetails()) {
+                    if (detail.getId() == detailId) {
+                        model.addAttribute("detail", detail);
+                    }
+                }
+            }
+        }
+        return "pathvariables/view";
+    }
+}

spring-thymeleaf-2/src/main/java/com/baeldung/thymeleaf/templatedir/HelloController.java

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+package com.baeldung.thymeleaf.templatedir;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+
+@Controller
+public class HelloController {
+
+    @GetMapping("/hello")
+    public String sayHello() {
+        return "hello";
+    }
+}

spring-thymeleaf-2/src/main/resources/application.properties

@@ -0,0 +1 @@
+#spring.thymeleaf.prefix=classpath:/templates-2/

spring-thymeleaf-2/src/main/resources/templates-2/hello.html

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+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+<meta charset="UTF-8">
+<title>Enums in Thymeleaf</title>
+</head>
+<body>
+    <h2>Hello from 'templates/templates-2'</h2>
+</body>
+</html>

spring-thymeleaf-2/src/main/resources/templates-2/participants.html

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+<!doctype html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+</head>
+
+<h2>Enter participant</h2>
+<form th:action="@{/participants}">
+
+    <input type="text" th:name="participant"/>
+    <select name="country">
+        <option value="de">Germany</option>
+        <option value="nl">Netherlands</option>
+        <option value="pl">Poland</option>
+        <option value="lv">Latvia</option>
+    </select>
+    <button type="submit" th:name="action" th:value="in">check-in</button>
+    <button type="submit" th:name="action" th:value="out">check-out</button>
+</form>
+
+<th:block th:if="${id != null}">
+    <h2 >User Details</h2>
+    <p>Details for user [[${id}]] ...</p>
+</th:block>
+
+<h2>Users</h2>
+<th:block th:each="userId: ${userIds}">
+    <p>
+        <a th:href="@{/participants(id=${userId})}"> User [[${userId}]]</a>
+    </p>
+</th:block>
+
+</html>

spring-thymeleaf-2/src/main/resources/templates/enums/new.html

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+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+<meta charset="UTF-8">
+<title>Enums in Thymeleaf</title>
+</head>
+<body>
+    <form th:action="@{/widget/add}" method="post" th:object="${widget}">
+        <h3>Add New Widget</h3>
+        <label for="name">Name: </label>
+        <input type="text" name="name"/>
+        <label for="color">Color: </label>
+        <select name="color">
+            <option th:each="colorOpt : ${T(com.baeldung.thymeleaf.enums.Color).values()}" th:value="${colorOpt}" th:text="${colorOpt.displayValue}"></option>
+        </select>
+        <input type="submit" value="Submit" />
+    </form>
+</body>
+</html>

spring-thymeleaf-2/src/main/resources/templates/enums/view.html

@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+<meta charset="UTF-8">
+<title>Enums in Thymeleaf</title>
+</head>
+<body>
+    <h3>View Widget</h3>
+    <div>
+        <label for="name">Name: </label>
+        <span th:text="${widget.name}"></span>
+    </div>
+    <div>
+        <label for="color">Color: </label>
+        <span th:text="${widget.color.displayValue}"></span>
+    </div>
+    <div th:if="${widget.color == T(com.baeldung.thymeleaf.enums.Color).RED}">
+        This color screams danger.
+    </div>
+    <div th:if="${widget.color.name() == 'GREEN'}">
+        Green is for go.
+    </div>
+    <div th:switch="${widget.color}">
+        <span th:case="${T(com.baeldung.thymeleaf.enums.Color).RED}" style="color: red;">Alert</span>
+        <span th:case="${T(com.baeldung.thymeleaf.enums.Color).ORANGE}" style="color: orange;">Warning</span>
+        <span th:case="${T(com.baeldung.thymeleaf.enums.Color).YELLOW}" style="color: yellow;">Caution</span>
+        <span th:case="${T(com.baeldung.thymeleaf.enums.Color).GREEN}" style="color: green;">All Good</span>
+    </div>
+</body>
+</html>

spring-thymeleaf-2/src/main/resources/templates/lists/contains.html

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+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8">
+    <title>Lists Utility Class in Thymeleaf</title>
+</head>
+<body>
+myList contains red: <span th:text="${#lists.contains(myList, 'red')}"/>
+
+myList contains red and green: <span th:text='${#lists.containsAll(myList, {"red", "green"})}'/>
+</body>
+</html>

spring-thymeleaf-2/src/main/resources/templates/lists/isEmpty.html

@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8">
+    <title>Lists Utility Class in Thymeleaf</title>
+</head>
+<body>
+
+isEmpty Check : <span th:text="${#lists.isEmpty(myList)}"/>
+
+<span th:unless="${#lists.isEmpty(myList)}">List is not empty</span>
+
+</body>
+</html>

spring-thymeleaf-2/src/main/resources/templates/lists/size.html

@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8">
+    <title>Lists Utility Class in Thymeleaf</title>
+</head>
+<body>
+
+size: <span th:text="${#lists.size(myList)}"/>
+
+</body>
+</html>

spring-thymeleaf-2/src/main/resources/templates/lists/sort.html

@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8">
+    <title>Lists Utility Class in Thymeleaf</title>
+</head>
+<body>
+sort: <span th:text="${#lists.sort(myList)}"/>
+
+sort with Comparator: <span th:text="${#lists.sort(myList, reverse)}"/>
+</body>
+</html>

spring-thymeleaf-2/src/main/resources/templates/lists/toList.html

@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8">
+    <title>Lists Utility Class in Thymeleaf</title>
+</head>
+<body>
+
+<span th:with="convertedList=${#lists.toList(myArray)}">
+    converted list size: <span th:text="${#lists.size(convertedList)}"/>
+</span>
+
+</body>
+</html>

spring-thymeleaf-2/src/main/resources/templates/pathvariables/index.html

@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+<meta charset="UTF-8">
+<title>PathVariables in Thymeleaf</title>
+</head>
+<body>
+    <h3>Items</h3>
+    <div th:each="item : ${items}">
+        <a th:href="@{/pathvars/single/{id}(id = ${item.id})}">
+            <span th:text="${item.name}"></span>
+        </a>
+        <ul>
+            <li th:each="detail : ${item.details}">
+                <a th:href="@{/pathvars/item/{itemId}/detail/{detailId}(itemId = ${item.id}, detailId = ${detail.id})}">
+                    <span th:text="${detail.description}"></span>
+                </a>
+            </li>
+        </ul>
+    </div>
+</body>
+</html>

spring-thymeleaf-2/src/main/resources/templates/pathvariables/view.html

@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+<meta charset="UTF-8">
+<title>Pathvariables in Thymeleaf</title>
+</head>
+<body>
+    <h3>View Item</h3>
+    <div>
+        <label for="name">Name: </label>
+        <span th:text="${item.name}"></span>
+    </div>
+    <h4 th:if="${detail}">Detail</h4>
+    <div th:if="${detail}">
+        <label for="description">Description: </label>
+        <span th:text="${detail.description}"></span>
+    </div>
+</body>
+</html>

spring-thymeleaf-2/src/test/java/com/baeldung/thymeleaf/lists/ListsControllerIntegrationTest.java

@@ -0,0 +1,60 @@
+package com.baeldung.thymeleaf.lists;
+
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+@AutoConfigureMockMvc(printOnlyOnFailure = false)
+public class ListsControllerIntegrationTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Test
+    public void whenCalledToList_ThenConvertsToList() throws Exception {
+        mockMvc.perform(MockMvcRequestBuilders.get("/lists/toList"))
+          .andExpect(status().isOk())
+          .andExpect(content().string(containsString("converted list size: <span>4</span>")));
+    }
+
+    @Test
+    public void whenCalledContains_ThenChecksMembership() throws Exception {
+        mockMvc.perform(MockMvcRequestBuilders.get("/lists/contains"))
+          .andExpect(status().isOk())
+          .andExpect(content().string(containsString("myList contains red: <span>true</span>")))
+          .andExpect(content().string(containsString("myList contains red and green: <span>true</span>")));
+    }
+
+    @Test
+    public void whenCalledSize_ThenReturnsSize() throws Exception {
+        mockMvc.perform(MockMvcRequestBuilders.get("/lists/size"))
+          .andExpect(status().isOk())
+          .andExpect(content().string(containsString("size: <span>4</span>")));
+    }
+
+    @Test
+    public void whenCalledSort_ThenSortsItems() throws Exception {
+        mockMvc.perform(MockMvcRequestBuilders.get("/lists/sort"))
+          .andExpect(status().isOk())
+          .andExpect(content().string(containsString("sort: <span>[blue, green, red, yellow]</span>")))
+          .andExpect(content().string(containsString("sort with Comparator: <span>[yellow, red, green, blue]</span>")));
+    }
+
+    @Test
+    public void whenCalledIsEmpty_ThenChecksAnyMembers() throws Exception {
+        mockMvc.perform(MockMvcRequestBuilders.get("/lists/isEmpty"))
+          .andExpect(status().isOk())
+          .andExpect(content().string(containsString("isEmpty Check : <span>false</span>")));
+    }
+}