mongodb.findSpecificDocument.java Source code

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Here is the source code for mongodb.findSpecificDocument.java

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/*
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//
//Retrieving Specific Documents from MongoDB Using Java.
package mongodb;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;

/**
 *
 * @author soham
 */
public class findSpecificDocument {
    public static void main(String[] args) {
        try {
            MongoClient mongoClient = new MongoClient("localhost", 27017);
            DB db = mongoClient.getDB("words");
            DBCollection collection = db.getCollection("word_stats");
            findSpecificDocument.over12(collection);
            findSpecificDocument.startingABC(collection);
            findSpecificDocument.startEndVowels(collection);
            findSpecificDocument.over6Vowels(collection);
            findSpecificDocument.nonAlphaCharacters(collection);
        } catch (Exception e) {
            //System.out.println(e);
        }
    }

    public static void displayCursor(DBCursor cursor) {
        String words = "";
        while (cursor.hasNext()) {
            DBObject doc = cursor.next();
            words = words.concat(doc.get("word").toString()).concat(",");
        }
        if (words.length() > 65) {
            words = words.substring(0, 65) + "...";
        }
        System.out.println(words);
    }

    public static void over12(DBCollection collection) {
        BasicDBObject query = new BasicDBObject("size", new BasicDBObject("$gt", 12));
        DBCursor cursor = collection.find(query);
        System.out.println("\nWords with more than 12 characters: ");
        findSpecificDocument.displayCursor(cursor);
    }

    public static void startingABC(DBCollection collection) {
        BasicDBObject query = new BasicDBObject("first", new BasicDBObject("$in", new String[] { "a", "b", "c" }));
        DBCursor cursor = collection.find(query);
        System.out.println("\nWords starting with A, B or C: ");
        findSpecificDocument.displayCursor(cursor);
    }

    public static void startEndVowels(DBCollection collection) {
        BasicDBObject query = new BasicDBObject("$and", new BasicDBObject[] {
                new BasicDBObject("first", new BasicDBObject("$in", new String[] { "a", "e", "i", "o", "u" })),
                new BasicDBObject("last", new BasicDBObject("$in", new String[] { "a", "e", "i", "o", "u" })) });
        query.append("size", new BasicDBObject("$gt", 5));
        DBCursor cursor = collection.find(query);
        System.out.println("\nWords starting and ending with a vowel: ");
        findSpecificDocument.displayCursor(cursor);
    }

    public static void over6Vowels(DBCollection collection) {
        BasicDBObject query = new BasicDBObject("stats.vowels", new BasicDBObject("$gt", 5));
        DBCursor cursor = collection.find(query);
        System.out.println("\nWords with more than 5 vowels: ");
        findSpecificDocument.displayCursor(cursor);
    }

    public static void nonAlphaCharacters(DBCollection collection) {
        BasicDBObject query = new BasicDBObject("charsets",
                new BasicDBObject("$elemMatch",
                        new BasicDBObject("$and", new BasicDBObject[] { new BasicDBObject("type", "other"),
                                new BasicDBObject("chars", new BasicDBObject("$size", 1)) })));
        DBCursor cursor = collection.find(query);
        System.out.println("\nWords with 1 non-alphabet characters: ");
        findSpecificDocument.displayCursor(cursor);
    }

}