Text blocks, Locales, Numbers & Math

Author: AnghelLeonard

Chapter01/P16_CustomTemplateProcessor4/pom.xml

@@ -10,9 +10,17 @@
         <maven.compiler.source>21</maven.compiler.source>
         <maven.compiler.target>21</maven.compiler.target>
 
-        <maven.compiler.plugin>3.6.1</maven.compiler.plugin>        
+        <maven.compiler.plugin>3.6.1</maven.compiler.plugin>
+        <jackson.version>2.9.7</jackson.version>
     </properties>
-    <name>P16_CustomTemplateProcessor4</name>    
+    <name>P16_CustomTemplateProcessor4</name>
+    <dependencies>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+    </dependencies>
     <build>
         <plugins>
             <plugin>

Chapter01/P16_CustomTemplateProcessor4/src/main/java/modern/challenge/Main.java

@@ -1,25 +1,51 @@
 package modern.challenge;
 
-import java.util.List;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import java.io.IOException;
+import java.util.regex.Pattern;
 
 public class Main {
 
-    public static void main(String[] args) {
-
-        PhoneProcessor pp = new PhoneProcessor();
-        
-        List<String> names = List.of("Arita Ion", "Mark Jurg", "Paul Istrate");
-        List<String> phones= List.of("244-815-0089", "0721-825-8892", "(045)655-9230");
-        
-        StringBuilder xmlMessage = new StringBuilder();
-        for (int i = 0; i < names.size(); i++) {
-        
-        xmlMessage.append(pp."""          
-           <name>\{names.get(i)}</name>
-           <phone>\{phones.get(i)}</phone>                   
-           """);
-        }
+    private static final Pattern PHONE_PATTERN = Pattern.compile(
+            "\\d{10}|(?:\\d{3}-){2}\\d{4}|\\(\\d{3}\\)\\d{3}-?\\d{4}");
+
+    public static void main(String[] args) throws IOException {
+
+        StringTemplate.Processor<JsonNode, IllegalArgumentException> pp
+                = (StringTemplate st) -> {
+
+                    var values = st.values().stream()
+                            .map(value -> {
+                                if (!PHONE_PATTERN.matcher((CharSequence) value).matches()) {
+                                    return "Invalid phone number";
+                                }
+
+                                return value;
+                            }).toList();
+
+                    ObjectMapper mapper = new ObjectMapper();
+
+                    try {
+                        return mapper.readTree(StringTemplate.interpolate(
+                                st.fragments(), values));
+                    } catch (IOException ex) {
+                        throw new RuntimeException(ex);
+                    }
+                };
+
+        String workPhone = "072-825-90095"; // not valid
+        String homePhone = "(040)234-9670";
+
+        JsonNode jsonMessage = pp.
+        """
+           { "contact": {
+               "work": "\{workPhone}",
+               "home": "\{homePhone}"
+               }
+           }  
+           """;
 
-        System.out.println(xmlMessage);
+        System.out.println(jsonMessage);
     }
 }

Chapter01/P16_CustomTemplateProcessor5/README.md

@@ -0,0 +1,2 @@
+# Writing a custom template processor: 
+Introduce the API for writing a user-defined template processor. Next, provide a few examples of custom template processors.

Chapter01/P16_CustomTemplateProcessor5/pom.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>java.modern.challenge</groupId>
+    <artifactId>P16_CustomTemplateProcessor5</artifactId>
+    <version>1.0</version>
+    <packaging>jar</packaging>
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
+        
+        <maven.compiler.plugin>3.6.1</maven.compiler.plugin>        
+    </properties>
+    <name>P16_CustomTemplateProcessor5</name>    
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven.compiler.plugin}</version>  
+                <configuration>
+                    <compilerArgs>
+                        <arg>--enable-preview</arg>
+                    </compilerArgs>
+                </configuration>              
+            </plugin>           
+        </plugins>
+    </build>
+</project>

Chapter01/P16_CustomTemplateProcessor5/src/main/java/modern/challenge/Main.java

@@ -0,0 +1,25 @@
+package modern.challenge;
+
+import java.util.List;
+
+public class Main {
+
+    public static void main(String[] args) {
+
+        PhoneProcessor pp = new PhoneProcessor();
+        
+        List<String> names = List.of("Arita Ion", "Mark Jurg", "Paul Istrate");
+        List<String> phones= List.of("244-815-0089", "0721-825-8892", "(045)655-9230");
+        
+        StringBuilder xmlMessage = new StringBuilder();
+        for (int i = 0; i < names.size(); i++) {
+        
+        xmlMessage.append(pp."""          
+           <name>\{names.get(i)}</name>
+           <phone>\{phones.get(i)}</phone>                   
+           """);
+        }
+           
+        System.out.println(xmlMessage);
+    }
+}