Merge branch 'master' into bael-16656

persistence-modules/java-mongodb/src/main/java/com/baeldung/MongoBsonExample.java

@@ -0,0 +1,79 @@
+package com.baeldung;
+
+import com.mongodb.client.MongoClient;
+import com.mongodb.client.MongoClients;
+import com.mongodb.client.MongoCollection;
+import com.mongodb.client.MongoDatabase;
+import org.bson.Document;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class MongoBsonExample
+{
+   public static void main(String[] args)
+   {
+      //
+      // 4.1 Connect to cluster (default is localhost:27017)
+      //
+
+      MongoClient mongoClient = MongoClients.create();
+      MongoDatabase database = mongoClient.getDatabase("myDB");
+      MongoCollection<Document> collection = database.getCollection("employees");
+
+      //
+      // 4.2 Insert new document
+      //
+
+      Document employee = new Document()
+                             .append("first_name", "Joe")
+                             .append("last_name", "Smith")
+                             .append("title", "Java Developer")
+                             .append("years_of_service", 3)
+                             .append("skills", Arrays.asList("java", "spring", "mongodb"))
+                             .append("manager", new Document()
+                                                   .append("first_name", "Sally")
+                                                   .append("last_name", "Johanson"));
+      collection.insertOne(employee);
+
+      //
+      // 4.3 Find documents
+      //
+
+
+      Document query = new Document("last_name", "Smith");
+      List results = new ArrayList<>();
+      collection.find(query).into(results);
+
+      query =
+         new Document("$or", Arrays.asList(
+            new Document("last_name", "Smith"),
+            new Document("first_name", "Joe")));
+      results = new ArrayList<>();
+      collection.find(query).into(results);
+
+      //
+      // 4.4 Update document
+      //
+
+      query = new Document(
+         "skills",
+         new Document(
+            "$elemMatch",
+            new Document("$eq", "spring")));
+      Document update = new Document(
+         "$push",
+         new Document("skills", "security"));
+      collection.updateMany(query, update);
+
+      //
+      // 4.5 Delete documents
+      //
+
+      query = new Document(
+         "years_of_service",
+         new Document("$lt", 0));
+      collection.deleteMany(query);
+   }
+}

persistence-modules/java-mongodb/src/main/java/com/baeldung/MongoExample.java

@@ -0,0 +1,53 @@
+package com.baeldung;
+
+import com.mongodb.BasicDBObject;
+import com.mongodb.DB;
+import com.mongodb.DBCollection;
+import com.mongodb.DBCursor;
+import com.mongodb.MongoClient;
+
+public class MongoExample {
+    public static void main(String[] args) {
+
+        MongoClient mongoClient = new MongoClient("localhost", 27017);
+
+        DB database = mongoClient.getDB("myMongoDb");
+
+        // print existing databases
+        mongoClient.getDatabaseNames().forEach(System.out::println);
+
+        database.createCollection("customers", null);
+
+        // print all collections in customers database
+        database.getCollectionNames().forEach(System.out::println);
+
+        // create data
+        DBCollection collection = database.getCollection("customers");
+        BasicDBObject document = new BasicDBObject();
+        document.put("name", "Shubham");
+        document.put("company", "Baeldung");
+        collection.insert(document);
+
+        // update data
+        BasicDBObject query = new BasicDBObject();
+        query.put("name", "Shubham");
+        BasicDBObject newDocument = new BasicDBObject();
+        newDocument.put("name", "John");
+        BasicDBObject updateObject = new BasicDBObject();
+        updateObject.put("$set", newDocument);
+        collection.update(query, updateObject);
+
+        // read data
+        BasicDBObject searchQuery = new BasicDBObject();
+        searchQuery.put("name", "John");
+        DBCursor cursor = collection.find(searchQuery);
+        while (cursor.hasNext()) {
+            System.out.println(cursor.next());
+        }
+
+        // delete data
+        BasicDBObject deleteQuery = new BasicDBObject();
+        deleteQuery.put("name", "John");
+        collection.remove(deleteQuery);
+    }
+}

persistence-modules/java-mongodb/src/main/java/com/baeldung/morphia/domain/Author.java

@@ -0,0 +1,31 @@
+package com.baeldung.morphia.domain;
+
+import java.util.List;
+
+import dev.morphia.annotations.Entity;
+import dev.morphia.annotations.Id;
+
+@Entity
+public class Author {
+
+    @Id
+    private String name;
+    private List<String> books;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public List<String> getBooks() {
+        return books;
+    }
+
+    public void setBooks(List<String> books) {
+        this.books = books;
+    }
+
+}

persistence-modules/java-mongodb/src/main/java/com/baeldung/morphia/domain/Book.java

@@ -0,0 +1,116 @@
+package com.baeldung.morphia.domain;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import dev.morphia.annotations.Embedded;
+import dev.morphia.annotations.Entity;
+import dev.morphia.annotations.Field;
+import dev.morphia.annotations.Id;
+import dev.morphia.annotations.Index;
+import dev.morphia.annotations.IndexOptions;
+import dev.morphia.annotations.Indexes;
+import dev.morphia.annotations.Property;
+import dev.morphia.annotations.Reference;
+import dev.morphia.annotations.Validation;
+
+@Entity("Books")
+@Indexes({ @Index(fields = @Field("title"), options = @IndexOptions(name = "book_title")) })
+@Validation("{ price : { $gt : 0 } }")
+public class Book {
+    @Id
+    private String isbn;
+    @Property
+    private String title;
+    private String author;
+    @Embedded
+    private Publisher publisher;
+    @Property("price")
+    private double cost;
+    @Reference
+    private Set<Book> companionBooks;
+
+    public Book() {
+
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public double getCost() {
+        return cost;
+    }
+
+    public void addCompanionBooks(Book book) {
+        if (companionBooks != null)
+            this.companionBooks.add(book);
+    }
+
+    public Book(String isbn, String title, String author, double cost, Publisher publisher) {
+        this.isbn = isbn;
+        this.title = title;
+        this.author = author;
+        this.cost = cost;
+        this.publisher = publisher;
+        this.companionBooks = new HashSet<>();
+    }
+
+    @Override
+    public String toString() {
+        return "Book [isbn=" + isbn + ", title=" + title + ", author=" + author + ", publisher=" + publisher + ", cost=" + cost + "]";
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((author == null) ? 0 : author.hashCode());
+        long temp;
+        temp = Double.doubleToLongBits(cost);
+        result = prime * result + (int) (temp ^ (temp >>> 32));
+        result = prime * result + ((isbn == null) ? 0 : isbn.hashCode());
+        result = prime * result + ((publisher == null) ? 0 : publisher.hashCode());
+        result = prime * result + ((title == null) ? 0 : title.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        Book other = (Book) obj;
+        if (author == null) {
+            if (other.author != null)
+                return false;
+        } else if (!author.equals(other.author))
+            return false;
+        if (Double.doubleToLongBits(cost) != Double.doubleToLongBits(other.cost))
+            return false;
+        if (isbn == null) {
+            if (other.isbn != null)
+                return false;
+        } else if (!isbn.equals(other.isbn))
+            return false;
+        if (publisher == null) {
+            if (other.publisher != null)
+                return false;
+        } else if (!publisher.equals(other.publisher))
+            return false;
+        if (title == null) {
+            if (other.title != null)
+                return false;
+        } else if (!title.equals(other.title))
+            return false;
+        return true;
+    }
+
+}

persistence-modules/java-mongodb/src/main/java/com/baeldung/morphia/domain/Publisher.java

@@ -0,0 +1,70 @@
+package com.baeldung.morphia.domain;
+
+import org.bson.types.ObjectId;
+
+import dev.morphia.annotations.Entity;
+import dev.morphia.annotations.Id;
+
+@Entity
+public class Publisher {
+
+    @Id
+    private ObjectId id;
+    private String name;
+
+    public Publisher() {
+
+    }
+
+    public Publisher(ObjectId id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public ObjectId getId() {
+        return id;
+    }
+
+    public void setId(ObjectId id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public String toString() {
+        return "Catalog [id=" + id + ", name=" + name + "]";
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((name == null) ? 0 : name.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        Publisher other = (Publisher) obj;
+        if (name == null) {
+            if (other.name != null)
+                return false;
+        } else if (!name.equals(other.name))
+            return false;
+        return true;
+    }
+
+}

persistence-modules/java-mongodb/src/main/java/com/baeldung/tagging/Post.java

@@ -0,0 +1,142 @@
+package com.baeldung.tagging;
+
+import java.util.List;
+
+/**
+ * Model for a blog post.
+ * 
+ * @author Donato Rimenti
+ *
+ */
+public class Post {
+
+	/**
+	 * Title of the post. Must be unique.
+	 */
+	private String title;
+
+	/**
+	 * Author of the post.
+	 */
+	private String author;
+
+	/**
+	 * Tags of the post.
+	 */
+	private List<String> tags;
+
+	/**
+	 * Gets the {@link #title}.
+	 *
+	 * @return the {@link #title}
+	 */
+	public String getTitle() {
+		return title;
+	}
+
+	/**
+	 * Sets the {@link #title}.
+	 *
+	 * @param title
+	 *            the new {@link #title}
+	 */
+	public void setTitle(String title) {
+		this.title = title;
+	}
+
+	/**
+	 * Gets the {@link #author}.
+	 *
+	 * @return the {@link #author}
+	 */
+	public String getAuthor() {
+		return author;
+	}
+
+	/**
+	 * Sets the {@link #author}.
+	 *
+	 * @param author
+	 *            the new {@link #author}
+	 */
+	public void setAuthor(String author) {
+		this.author = author;
+	}
+
+	/**
+	 * Gets the {@link #tags}.
+	 *
+	 * @return the {@link #tags}
+	 */
+	public List<String> getTags() {
+		return tags;
+	}
+
+	/**
+	 * Sets the {@link #tags}.
+	 *
+	 * @param tags
+	 *            the new {@link #tags}
+	 */
+	public void setTags(List<String> tags) {
+		this.tags = tags;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see java.lang.Object#hashCode()
+	 */
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + ((author == null) ? 0 : author.hashCode());
+		result = prime * result + ((tags == null) ? 0 : tags.hashCode());
+		result = prime * result + ((title == null) ? 0 : title.hashCode());
+		return result;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see java.lang.Object#equals(java.lang.Object)
+	 */
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj)
+			return true;
+		if (obj == null)
+			return false;
+		if (getClass() != obj.getClass())
+			return false;
+		Post other = (Post) obj;
+		if (author == null) {
+			if (other.author != null)
+				return false;
+		} else if (!author.equals(other.author))
+			return false;
+		if (tags == null) {
+			if (other.tags != null)
+				return false;
+		} else if (!tags.equals(other.tags))
+			return false;
+		if (title == null) {
+			if (other.title != null)
+				return false;
+		} else if (!title.equals(other.title))
+			return false;
+		return true;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see java.lang.Object#toString()
+	 */
+	@Override
+	public String toString() {
+		return "Post [title=" + title + ", author=" + author + ", tags=" + tags + "]";
+	}
+
+}

persistence-modules/java-mongodb/src/main/java/com/baeldung/tagging/TagRepository.java

@@ -0,0 +1,153 @@
+package com.baeldung.tagging;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.StreamSupport;
+
+import org.bson.Document;
+
+import com.mongodb.BasicDBObject;
+import com.mongodb.DBCollection;
+import com.mongodb.MongoClient;
+import com.mongodb.client.FindIterable;
+import com.mongodb.client.MongoCollection;
+import com.mongodb.client.MongoDatabase;
+import com.mongodb.client.model.Filters;
+import com.mongodb.client.model.Updates;
+import com.mongodb.client.result.UpdateResult;
+
+/**
+ * Repository used to manage tags for a blog post.
+ * 
+ * @author Donato Rimenti
+ *
+ */
+public class TagRepository implements Closeable {
+
+	/**
+	 * Document field which holds the blog tags.
+	 */
+	private static final String TAGS_FIELD = "tags";
+
+	/**
+	 * The post collection.
+	 */
+	private MongoCollection<Document> collection;
+
+	/**
+	 * The MongoDB client, stored in a field in order to close it later.
+	 */
+	private MongoClient mongoClient;
+
+	/**
+	 * Instantiates a new TagRepository by opening the DB connection.
+	 */
+	public TagRepository() {
+		mongoClient = new MongoClient("localhost", 27018);
+		MongoDatabase database = mongoClient.getDatabase("blog");
+		collection = database.getCollection("posts");
+	}
+
+	/**
+	 * Returns a list of posts which contains one or more of the tags passed as
+	 * argument.
+	 * 
+	 * @param tags
+	 *            a list of tags
+	 * @return a list of posts which contains at least one of the tags passed as
+	 *         argument
+	 */
+	public List<Post> postsWithAtLeastOneTag(String... tags) {
+		FindIterable<Document> results = collection.find(Filters.in(TAGS_FIELD, tags));
+		return StreamSupport.stream(results.spliterator(), false).map(TagRepository::documentToPost)
+				.collect(Collectors.toList());
+	}
+
+	/**
+	 * Returns a list of posts which contains all the tags passed as argument.
+	 * 
+	 * @param tags
+	 *            a list of tags
+	 * @return a list of posts which contains all the tags passed as argument
+	 */
+	public List<Post> postsWithAllTags(String... tags) {
+		FindIterable<Document> results = collection.find(Filters.all(TAGS_FIELD, tags));
+		return StreamSupport.stream(results.spliterator(), false).map(TagRepository::documentToPost)
+				.collect(Collectors.toList());
+	}
+
+	/**
+	 * Returns a list of posts which contains none of the tags passed as
+	 * argument.
+	 * 
+	 * @param tags
+	 *            a list of tags
+	 * @return a list of posts which contains none of the tags passed as
+	 *         argument
+	 */
+	public List<Post> postsWithoutTags(String... tags) {
+		FindIterable<Document> results = collection.find(Filters.nin(TAGS_FIELD, tags));
+		return StreamSupport.stream(results.spliterator(), false).map(TagRepository::documentToPost)
+				.collect(Collectors.toList());
+	}
+
+	/**
+	 * Adds a list of tags to the blog post with the given title.
+	 * 
+	 * @param title
+	 *            the title of the blog post
+	 * @param tags
+	 *            a list of tags to add
+	 * @return the outcome of the operation
+	 */
+	public boolean addTags(String title, List<String> tags) {
+		UpdateResult result = collection.updateOne(new BasicDBObject(DBCollection.ID_FIELD_NAME, title),
+				Updates.addEachToSet(TAGS_FIELD, tags));
+		return result.getModifiedCount() == 1;
+	}
+
+	/**
+	 * Removes a list of tags to the blog post with the given title.
+	 * 
+	 * @param title
+	 *            the title of the blog post
+	 * @param tags
+	 *            a list of tags to remove
+	 * @return the outcome of the operation
+	 */
+	public boolean removeTags(String title, List<String> tags) {
+		UpdateResult result = collection.updateOne(new BasicDBObject(DBCollection.ID_FIELD_NAME, title),
+				Updates.pullAll(TAGS_FIELD, tags));
+		return result.getModifiedCount() == 1;
+	}
+
+	/**
+	 * Utility method used to map a MongoDB document into a {@link Post}.
+	 * 
+	 * @param document
+	 *            the document to map
+	 * @return a {@link Post} object equivalent to the document passed as
+	 *         argument
+	 */
+	@SuppressWarnings("unchecked")
+	private static Post documentToPost(Document document) {
+		Post post = new Post();
+		post.setTitle(document.getString(DBCollection.ID_FIELD_NAME));
+		post.setAuthor(document.getString("author"));
+		post.setTags((List<String>) document.get(TAGS_FIELD));
+		return post;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see java.io.Closeable#close()
+	 */
+	@Override
+	public void close() throws IOException {
+		mongoClient.close();
+	}
+
+}