Add support for adding custom metadata (#8)

* add lombok dependency

* Add methods addMetadata and addMetadataProperty

* Version set to 1.1.0

* Introduce MetadataItem to replace multiple addMetadata methods

pom.xml

@@ -11,7 +11,7 @@
 
     <groupId>net.kemitix</groupId>
     <artifactId>epub-creator</artifactId>
-    <version>1.0.2</version>
+    <version>1.1.0</version>
     
     <scm>
         <connection>scm:git:git@github.com:kemitix/epub-creator.git</connection>
@@ -52,6 +52,13 @@
             <version>3.2.2</version>
         </dependency>
 
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.16</version>
+            <optional>true</optional>
+        </dependency>
+
     </dependencies>
     
     <build>

src/main/java/coza/opencollab/epub/creator/api/MetadataItem.java

@@ -0,0 +1,168 @@
+package coza.opencollab.epub.creator.api;
+
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+
+@AllArgsConstructor(access = AccessLevel.PRIVATE)
+public class MetadataItem {
+
+    private final String name; //e.g. dc:description
+    private final String id;// optional
+    private final String property;// optional
+    private final String refines;// optional
+    private final String value;// optional
+
+    public String getName() {
+        return name;
+    }
+
+    public boolean hasId() {
+        return id != null;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public boolean hasProperty() {
+        return property != null;
+    }
+
+    public String getProperty() {
+        return property;
+    }
+
+    public boolean hasRefines() {
+        return refines != null;
+    }
+
+    public String getRefines() {
+        return refines;
+    }
+
+    public boolean hasValue() {
+        return value != null;
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    public static Builder builder() {
+        return new Builder() {
+            @Override
+            public Stage1 name(String name) {
+                return new Stage1() {
+                    @Override
+                    public Stage2 id(String id) {
+                        return new Stage2() {
+                            @Override
+                            public Stage3 property(String property) {
+                                return new Stage3() {
+                                    @Override
+                                    public Stage4 refines(String refines) {
+                                        return new Stage4() {
+                                            @Override
+                                            public MetadataItem value(String value) {
+                                                return new MetadataItem(name, id, property, refines, value);
+                                            }
+
+                                            @Override
+                                            public MetadataItem build() {
+                                                return new MetadataItem(name, id, property, refines, null);
+                                            }
+                                        };
+                                    }
+
+                                    @Override
+                                    public MetadataItem value(String value) {
+                                        return new MetadataItem(name, id, property, null, value);
+                                    }
+
+                                    @Override
+                                    public MetadataItem build() {
+                                        return new MetadataItem(name, id, property, null, null);
+                                    }
+                                };
+                            }
+
+                            @Override
+                            public MetadataItem value(String value) {
+                                return new MetadataItem(name, id, null, null, value);
+                            }
+
+                            @Override
+                            public MetadataItem build() {
+                                return new MetadataItem(name, id, null, null, null);
+                            }
+                        };
+                    }
+
+                    @Override
+                    public Stage3 property(String property) {
+                        return new Stage3() {
+                            @Override
+                            public Stage4 refines(String refines) {
+                                return new Stage4() {
+                                    @Override
+                                    public MetadataItem value(String value) {
+                                        return new MetadataItem(name, null, property, refines, value);
+                                    }
+
+                                    @Override
+                                    public MetadataItem build() {
+                                        return new MetadataItem(name, null, property, refines, null);
+                                    }
+                                };
+                            }
+
+                            @Override
+                            public MetadataItem value(String value) {
+                                return new MetadataItem(name, null, property, null, value);
+                            }
+
+                            @Override
+                            public MetadataItem build() {
+                                return new MetadataItem(name, null, property, null, null);
+                            }
+                        };
+                    }
+
+                    @Override
+                    public MetadataItem value(String value) {
+                        return new MetadataItem(name, null, null, null, value);
+                    }
+
+                    @Override
+                    public MetadataItem build() {
+                        return new MetadataItem(name, null, null, null, null);
+                    }
+                };
+            }
+       };
+    }
+
+    public interface Builder {
+        Stage1 name(String name);
+        interface Stage1 {
+            Stage2 id(String id);
+            Stage3 property(String property);
+            MetadataItem value(String value);
+            MetadataItem build();
+        }
+        interface Stage2 {
+            Stage3 property(String property);
+            MetadataItem value(String value);
+            MetadataItem build();
+        }
+        interface Stage3 {
+            Stage4 refines(String refines);
+            MetadataItem value(String value);
+            MetadataItem build();
+        }
+        interface Stage4 {
+            MetadataItem value(String value);
+            MetadataItem build();
+        }
+    }
+}

src/main/java/coza/opencollab/epub/creator/api/OpfCreator.java

@@ -30,6 +30,8 @@ import coza.opencollab.epub.creator.model.EpubBook;
  */
 public interface OpfCreator {
 
+    void addMetadata(MetadataItem metadataItem);
+
     /**
      * Creates the OPF file text from the EpubBook data
      *

src/main/java/coza/opencollab/epub/creator/impl/OpfCreatorDefault.java

@@ -21,11 +21,10 @@
 package coza.opencollab.epub.creator.impl;
 
 import coza.opencollab.epub.creator.EpubConstants;
+import coza.opencollab.epub.creator.api.MetadataItem;
 import coza.opencollab.epub.creator.api.OpfCreator;
 import coza.opencollab.epub.creator.model.Content;
 import coza.opencollab.epub.creator.model.EpubBook;
-import java.text.SimpleDateFormat;
-import java.util.Date;
 import org.htmlcleaner.CleanerProperties;
 import org.htmlcleaner.ContentNode;
 import org.htmlcleaner.HtmlCleaner;
@@ -33,6 +32,11 @@ import org.htmlcleaner.PrettyXmlSerializer;
 import org.htmlcleaner.Serializer;
 import org.htmlcleaner.TagNode;
 
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+
 /**
  * Default implementation of the OpfCreator. This follows EPUB3 standards to
  * create the OPF file content.
@@ -57,6 +61,8 @@ public class OpfCreatorDefault implements OpfCreator {
      */
     private final Serializer htmlSetdown;
 
+    private final List<MetadataItem> metadataItems = new ArrayList<>();
+
     public OpfCreatorDefault() {
         cleaner = new HtmlCleaner();
         CleanerProperties htmlProperties = cleaner.getProperties();
@@ -66,6 +72,11 @@ public class OpfCreatorDefault implements OpfCreator {
         htmlSetdown = new PrettyXmlSerializer(htmlProperties);
     }
 
+    @Override
+    public void addMetadata(MetadataItem metadataItem) {
+        this.metadataItems.add(metadataItem);
+    }
+
     /**
      * {@inheritDoc}
      */
@@ -75,9 +86,30 @@ public class OpfCreatorDefault implements OpfCreator {
         addMetaDataTags(tagNode, book);
         addManifestTags(tagNode, book);
         addSpineTags(tagNode, book);
+        addCustomMetadata(tagNode, book);
         return htmlSetdown.getAsString(tagNode);
     }
 
+    private void addCustomMetadata(TagNode tagNode, EpubBook book) {
+        TagNode metaNode = tagNode.findElementByName("metadata", true);
+        metadataItems.forEach(item -> {
+            TagNode node = new TagNode(item.getName());
+            if (item.hasId()) {
+                node.addAttribute("id", item.getId());
+            }
+            if (item.hasProperty()) {
+                node.addAttribute("property", item.getProperty());
+            }
+            if (item.hasRefines()) {
+                node.addAttribute("refines", item.getRefines());
+            }
+            if (item.hasValue()) {
+                node.addChild(new ContentNode(item.getValue()));
+            }
+            metaNode.addChild(node);
+        });
+    }
+
     /**
      * Add the required meta data
      *

src/main/java/coza/opencollab/epub/creator/model/EpubBook.java

@@ -21,6 +21,7 @@
 package coza.opencollab.epub.creator.model;
 
 import coza.opencollab.epub.creator.EpubConstants;
+import coza.opencollab.epub.creator.api.MetadataItem;
 import coza.opencollab.epub.creator.util.EpubWriter;
 import java.io.IOException;
 import java.io.InputStream;
@@ -426,4 +427,9 @@ public class EpubBook {
         return uniqueHrefs;
     }
 
+    public void addMetadata(MetadataItem metadataItem) {
+        getEpubCreator().getOpfCreator()
+                .addMetadata(metadataItem);
+    }
+
 }

src/test/java/coza/opencollab/epub/creator/EpubCreatorTest.java

@@ -1,5 +1,6 @@
 package coza.opencollab.epub.creator;
 
+import coza.opencollab.epub.creator.api.MetadataItem;
 import coza.opencollab.epub.creator.model.EpubBook;
 import java.io.File;
 import java.io.FileOutputStream;
@@ -18,6 +19,12 @@ public class EpubCreatorTest {
         try (FileOutputStream file = new FileOutputStream(new File("test.epub"))) {
             EpubBook book = new EpubBook("en", "Samuel .-__Id1", "Samuel Test Book", "Samuel Holtzkampf");
 
+            MetadataItem.Builder builder = MetadataItem.builder();
+            book.addMetadata(builder.name("dc:creator").value("Bob Smith"));
+            book.addMetadata(builder.name("meta")
+                    .property("role").refines("#editor-id")
+                    .value("Editor"));
+
             book.addContent(this.getClass().getResourceAsStream("/epub30-overview.xhtml"),
                     "application/xhtml+xml", "xhtml/epub30-overview.xhtml", true, true).setId("Overview");
             book.addContent(this.getClass().getResourceAsStream("/idpflogo_web_125.jpg"),