- refactored asciidoctor code (#2164)

- refreshed README.md

asciidoctor/README.md

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+### Relevant articles
+
+- [Introduction to Asciidoctor](http://www.baeldung.com/introduction-to-asciidoctor)

asciidoctor/pom.xml

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+<?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">
+    <parent>
+        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>asciidoctor</artifactId>
+    <name>asciidoctor</name>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.asciidoctor</groupId>
+                <artifactId>asciidoctor-maven-plugin</artifactId>
+                <version>1.5.5</version>
+                <dependencies>
+                    <dependency>
+                        <groupId>org.asciidoctor</groupId>
+                        <artifactId>asciidoctorj-pdf</artifactId>
+                        <version>1.5.0-alpha.15</version>
+                    </dependency>
+                </dependencies>
+                <executions>
+                    <execution>
+                        <id>output-pdf</id>
+                        <phase>generate-resources</phase>
+                        <goals>
+                            <goal>process-asciidoc</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <sourceDirectory>src/docs/asciidoc</sourceDirectory>
+                    <outputDirectory>target/docs/asciidoc</outputDirectory>
+                    <backend>pdf</backend>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>        
+        <dependency>
+            <groupId>org.asciidoctor</groupId>
+            <artifactId>asciidoctorj</artifactId>
+            <version>1.5.4</version>
+        </dependency>
+        <dependency>
+            <groupId>org.asciidoctor</groupId>
+            <artifactId>asciidoctorj-pdf</artifactId>
+            <version>1.5.0-alpha.11</version>
+        </dependency>        
+    </dependencies>
+</project>

asciidoctor/src/docs/asciidoc/test.adoc

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+== Introduction Section
+
+Hi. I'm a simple test to see if this Maven build is working. If you see me in a nice PDF, then it means everything is [red]#working#.

asciidoctor/src/main/java/com/baeldung/asciidoctor/AsciidoctorDemo.java

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+package com.baeldung.asciidoctor;
+
+import static org.asciidoctor.Asciidoctor.Factory.create;
+import static org.asciidoctor.OptionsBuilder.options;
+
+import java.io.File;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.asciidoctor.Asciidoctor;
+
+public class AsciidoctorDemo {
+
+    private final Asciidoctor asciidoctor;
+
+    AsciidoctorDemo() {
+        asciidoctor = create();
+    }
+
+    public void generatePDFFromString(final String input) {
+
+        final Map<String, Object> options = options().inPlace(true)
+          .backend("pdf")
+          .asMap();
+
+
+        final String outfile = asciidoctor.convertFile(new File("sample.adoc"), options);
+    }
+
+    String generateHTMLFromString(final String input) {
+        return asciidoctor.convert("Hello _Baeldung_!", new HashMap<String, Object>());
+    }
+}

asciidoctor/src/test/java/com/baeldung/asciidoctor/AsciidoctorDemoTest.java

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+package com.baeldung.asciidoctor;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class AsciidoctorDemoTest {
+
+    @Test
+    public void givenString_whenConverting_thenResultingHTMLCode() {
+        final AsciidoctorDemo asciidoctorDemo = new AsciidoctorDemo();
+        Assert.assertEquals(asciidoctorDemo.generateHTMLFromString("Hello _Baeldung_!"), "<div class=\"paragraph\">\n<p>Hello <em>Baeldung</em>!</p>\n</div>");
+    }
+}