org.gitective.mongo.MongoUtils.java Source code

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Here is the source code for org.gitective.mongo.MongoUtils.java

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/*
 * Copyright (c) 2011 Kevin Sawicki <kevinsawicki@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
package org.gitective.mongo;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBObject;
import com.mongodb.Mongo;
import com.mongodb.MongoException;

import java.net.UnknownHostException;
import java.util.Arrays;

/**
 * MongoDB helpers
 */
public class MongoUtils {

    /**
     * Are the two given byte arrays equal?
     * 
     * @param old
     * @param current
     * @return true if equal, false if different
     */
    public static boolean equal(byte[] old, byte[] current) {
        return (old == null && current == null) || Arrays.equals(old, current);
    }

    /**
     * Get byte array value of key
     * 
     * @param object
     * @param key
     * @return byte array value
     */
    public static byte[] getBytes(DBObject object, String key) {
        Object value = object.get(key);
        return value instanceof byte[] ? (byte[]) value : null;
    }

    /**
     * Get string value of key
     * 
     * @param object
     * @param key
     * @return string value
     */
    public static String getString(DBObject object, String key) {
        Object value = object.get(key);
        return value != null ? value.toString() : null;
    }

    /**
     * Get integer value of key
     * 
     * @param object
     * @param key
     * @return integer value
     */
    public static int getInt(DBObject object, String key) {
        Object value = object.get(key);
        return value instanceof Integer ? ((Integer) value) : -1;
    }

    /**
     * Set key to value
     * 
     * @param key
     * @param value
     * @return query
     */
    public static BasicDBObject set(String key, Object value) {
        return new BasicDBObject("$set", new BasicDBObject(key, value));
    }

    /**
     * Unset key
     * 
     * @param key
     * @return query
     */
    public static BasicDBObject unset(String key) {
        return new BasicDBObject("$unset", new BasicDBObject(key, 1));
    }

    /**
     * Increment key by 1
     * 
     * @param key
     * @return query
     */
    public static BasicDBObject inc(String key) {
        return inc(key, 1);
    }

    /**
     * Increment key to by value
     * 
     * @param key
     * @param value
     * @return query
     */
    public static BasicDBObject inc(String key, Object value) {
        return new BasicDBObject("$inc", new BasicDBObject(key, value));
    }

    /**
     * Get DB with given name using default connection
     * 
     * @param name
     * @return database
     */
    public static DB getDB(String name) {
        try {
            return new Mongo().getDB(name);
        } catch (UnknownHostException e) {
            throw new IllegalArgumentException(e);
        } catch (MongoException e) {
            throw new IllegalArgumentException(e);
        }
    }
}