/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2009, 2015 Oracle and/or its affiliates.  All rights reserved.
 *
 */
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Xml;
using NUnit.Framework;
using BerkeleyDB;

namespace CsharpAPITest
{
	[TestFixture]
	public class HashDatabaseTest : CSharpTestFixture
	{

		[TestFixtureSetUp]
		public void SetUpTestFixture()
		{
			testFixtureName = "HashDatabaseTest";
			base.SetUpTestfixture();
		}

	[Test]
	public void TestBlob() {
		testName = "TestBlob";
		SetUpTest(false);
		// Test opening the blob database without environment.
		TestBlobHashDatabase(0, null, 6, null, false);

		/*
		 * Test opening the blob database without environment
		 * but specifying blob directory.
		 */
		TestBlobHashDatabase(0, null, 6, testHome + "/DBBLOB", true);

		// Test opening the blob database with environment.
		TestBlobHashDatabase(3, "ENVBLOB", 6, null, false);

		/*
		 * Test opening the blob database with environment
		 * and specifying blob directory.
		 */
		TestBlobHashDatabase(3, null, 6, "/DBBLOB", true);
	}

	/*
	 * Test the blob database with or without environment.
	 * 1. Config and open the environment;
  	 * 2. Verify the environment blob configs;
 	 * 3. Config and open the database;
	 * 4. Verify the database blob configs;
	 * 5. Insert and verify some blob data by database methods;
	 * 6. Insert some blob data by cursor, update it and verify
	 * the update by database stream and cursor;
	 * 7. Verify the stats;
	 * 8. Close all handles.
	 * If "blobdbt" is true, set the data DatabaseEntry.Blob as
	 * true, otherwise make the data DatabaseEntry reach the blob
	 * threshold in size.
	 */
	void TestBlobHashDatabase(uint env_threshold, string env_blobdir,
	    uint db_threshold, string db_blobdir, bool blobdbt)
	{
		if (env_threshold == 0 && db_threshold == 0)
			return;

		string hashDBName =
		    testHome + "/" + testName + ".db";

		Configuration.ClearDir(testHome);
		HashDatabaseConfig cfg = new HashDatabaseConfig();
		cfg.Creation = CreatePolicy.ALWAYS;
		string blrootdir = "__db_bl";

		// Open the environment and verify the blob config.
		if (env_threshold > 0)
		{
			DatabaseEnvironmentConfig envConfig =
			    new DatabaseEnvironmentConfig();
			envConfig.AutoCommit = true;
			envConfig.Create = true;
			envConfig.UseMPool = true;
			envConfig.UseLogging = true;
			envConfig.UseTxns = true;
			envConfig.UseLocking = true;
			envConfig.BlobThreshold = env_threshold;
			if (env_blobdir != null)
			{
				envConfig.BlobDir = env_blobdir;
				blrootdir = env_blobdir;
			}
			DatabaseEnvironment env = DatabaseEnvironment.Open(
			    testHome, envConfig);
			if (env_blobdir == null)
				Assert.IsNull(env.BlobDir);
			else
				Assert.AreEqual(0,
				    env.BlobDir.CompareTo(env_blobdir));
			Assert.AreEqual(env_threshold, env.BlobThreshold);
			cfg.Env = env;
			hashDBName = testName + ".db";
		}

		// Open the database and verify the blob config.
		if (db_threshold > 0)
			cfg.BlobThreshold = db_threshold;
		if (db_blobdir != null)
		{
			cfg.BlobDir = db_blobdir;
			/*
			 * The blob directory setting in the database
			 * is effective only when it is opened without
			 * an environment.
			 */
			if (cfg.Env == null)
				blrootdir = db_blobdir;
		}

		HashDatabase db = HashDatabase.Open(hashDBName, cfg);
		Assert.AreEqual(
		    db_threshold > 0 ? db_threshold : env_threshold,
		db.BlobThreshold);
		if (db_blobdir == null && cfg.Env == null)
			Assert.IsNull(db.BlobDir);
		else
			Assert.AreEqual(0,
			    db.BlobDir.CompareTo(blrootdir));

		// Insert and verify some blob data by database methods.
		string[] records = {"a", "b", "c", "d", "e", "f", "g", "h",
		    "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s",
		    "t", "u", "v", "w", "x", "y", "z"};
		DatabaseEntry kdbt = new DatabaseEntry();
		DatabaseEntry ddbt = new DatabaseEntry();
		byte[] kdata, ddata;
		string str;
		KeyValuePair<DatabaseEntry, DatabaseEntry> pair;
		ddbt.Blob = blobdbt;
		Assert.AreEqual(blobdbt, ddbt.Blob);
		for (int i = 0; i < records.Length; i++)
		{
			kdata = BitConverter.GetBytes(i);
			str = records[i];
			if (!blobdbt)
			{
				for (int j = 0; j < db_threshold; j++)
					str = str + records[i];
			}
			ddata = Encoding.ASCII.GetBytes(str);
			kdbt.Data = kdata;
			ddbt.Data = ddata;
			db.Put(kdbt, ddbt);
			try
			{
				pair = db.Get(kdbt);
			}
			catch (DatabaseException)
			{
				db.Close();
				if (cfg.Env != null)
					cfg.Env.Close();
				throw new TestException();
			}
			Assert.AreEqual(ddata, pair.Value.Data);
		}

		/*
		 * Insert some blob data by cursor, update it and verify
		 * the update by database stream.
		 */
		kdata = BitConverter.GetBytes(records.Length);
		ddata = Encoding.ASCII.GetBytes("abc");
		kdbt.Data = kdata;
		ddbt.Data = ddata;
		ddbt.Blob = true;
		Assert.IsTrue(ddbt.Blob);
		pair =
		    new KeyValuePair<DatabaseEntry, DatabaseEntry>(kdbt, ddbt);
		CursorConfig dbcConfig = new CursorConfig();
		Transaction txn = null;
		if (cfg.Env != null)
			txn = cfg.Env.BeginTransaction();
		HashCursor cursor = db.Cursor(dbcConfig, txn);
		cursor.Add(pair);
		DatabaseStreamConfig dbsc = new DatabaseStreamConfig();
		dbsc.SyncPerWrite = true;
		DatabaseStream dbs = cursor.DbStream(dbsc);
		Assert.AreNotEqual(null, dbs);
		Assert.IsFalse(dbs.GetConfig.ReadOnly);
		Assert.IsTrue(dbs.GetConfig.SyncPerWrite);
		Assert.AreEqual(3, dbs.Size());
		DatabaseEntry sdbt = dbs.Read(0, 3);
		Assert.IsNotNull(sdbt);
		Assert.AreEqual(ddata, sdbt.Data);
		sdbt = new DatabaseEntry(Encoding.ASCII.GetBytes("defg"));
		Assert.IsTrue(dbs.Write(sdbt, 3));
		Assert.AreEqual(7, dbs.Size());
		sdbt = dbs.Read(0, 7);
		Assert.IsNotNull(sdbt);
		Assert.AreEqual(Encoding.ASCII.GetBytes("abcdefg"), sdbt.Data);
		dbs.Close();

		/*
		 * Verify the database stream can not write when it is
		 * configured to be read-only.
		 */
		dbsc.ReadOnly = true;
		dbs = cursor.DbStream(dbsc);
		Assert.IsTrue(dbs.GetConfig.ReadOnly);
		try
		{
			Assert.IsFalse(dbs.Write(sdbt, 7));
			throw new TestException();
		}
		catch (DatabaseException)
		{
		}
		dbs.Close();

		// Verify the update by cursor.
		Assert.IsTrue(cursor.Move(kdbt, true));
		pair = cursor.Current;
		Assert.AreEqual(Encoding.ASCII.GetBytes("abcdefg"),
		    pair.Value.Data);
		cursor.Close();
		if (cfg.Env != null)
			txn.Commit();

		/*
		 * Verify the blob files are created in the expected location.
		 * This part of test is disabled since BTreeDatabase.BlobSubDir
		 * is not exposed to users.
		 */
		//if (cfg.Env != null)
		//	blrootdir = testHome + "/" + blrootdir;
		//string blobdir = blrootdir + "/" + db.BlobSubDir;
		//Assert.AreEqual(records.Length + 1,
		//    Directory.GetFiles(blobdir, "__db.bl*").Length);
		//Assert.AreEqual(1,
		//    Directory.GetFiles(blobdir, "__db_blob_meta.db").Length);

		// Verify the stats.
		HashStats st = db.Stats();
		Assert.AreEqual(records.Length + 1, st.nBlobRecords);

		// Close all handles.
		db.Close();
		if (cfg.Env != null)
			cfg.Env.Close();

		/*
		 * Remove the default blob directory
		 * when it is not under the test home.
		 */
		if (db_blobdir == null && cfg.Env == null)
			Directory.Delete("__db_bl", true);
	}

        [Test]
        public void TestCompactWithoutTxn() {
            int i, nRecs;
            nRecs = 10000;
            testName = "TestCompactWithoutTxn";
            SetUpTest(true);
            string hashDBFileName = testHome + "/" + testName + ".db";

            HashDatabaseConfig hashDBConfig = new HashDatabaseConfig();
            hashDBConfig.Creation = CreatePolicy.ALWAYS;
            // The minimum page size
            hashDBConfig.PageSize = 512;
            hashDBConfig.HashComparison =
                new EntryComparisonDelegate(dbIntCompare);
            using (HashDatabase hashDB = HashDatabase.Open(
                hashDBFileName, hashDBConfig)) {
                DatabaseEntry key;
                DatabaseEntry data;

                // Fill the database with entries from 0 to 9999
                for (i = 0; i < nRecs; i++) {
                    key = new DatabaseEntry(BitConverter.GetBytes(i));
                    data = new DatabaseEntry(BitConverter.GetBytes(i));
                    hashDB.Put(key, data);
                }

                /*
                 * Delete entries below 500, between 3000 and
                 * 5000 and above 7000
                 */
                for (i = 0; i < nRecs; i++)
                    if (i < 500 || i > 7000 || (i < 5000 && i > 3000)) {
                        key = new DatabaseEntry(BitConverter.GetBytes(i));
                        hashDB.Delete(key);
                    }

                hashDB.Sync();
                long fileSize = new FileInfo(hashDBFileName).Length;

                // Compact database
                CompactConfig cCfg = new CompactConfig();
                cCfg.FillPercentage = 30;
                cCfg.Pages = 10;
                cCfg.Timeout = 1000;
                cCfg.TruncatePages = true;
                cCfg.start = new DatabaseEntry(BitConverter.GetBytes(1));
                cCfg.stop = new DatabaseEntry(BitConverter.GetBytes(7000));
                CompactData compactData = hashDB.Compact(cCfg);
                Assert.IsFalse((compactData.Deadlocks == 0) &&
                    (compactData.Levels == 0) &&
                    (compactData.PagesExamined == 0) &&
                    (compactData.PagesFreed == 0) &&
                    (compactData.PagesTruncated == 0));

                hashDB.Sync();
                long compactedFileSize = new FileInfo(hashDBFileName).Length;
                Assert.Less(compactedFileSize, fileSize);
            }
        }

        [Test]
		public void TestHashComparison()
		{
			testName = "TestHashComparison";
			SetUpTest(true);
			string dbFileName = testHome + "/" + testName + ".db";

			HashDatabaseConfig dbConfig = new HashDatabaseConfig();
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.HashComparison = new EntryComparisonDelegate(EntryComparison);
			HashDatabase db = HashDatabase.Open(dbFileName,dbConfig);
			int ret;

			/*
			 * Comparison gets the value that lowest byte of the 
			 * former dbt minus that of the latter one.
			 */
			ret = db.Compare(new DatabaseEntry(BitConverter.GetBytes(2)),
			    new DatabaseEntry(BitConverter.GetBytes(2)));
			Assert.AreEqual(0, ret);

			ret = db.Compare(new DatabaseEntry(BitConverter.GetBytes(256)),
			    new DatabaseEntry(BitConverter.GetBytes(1)));
			Assert.Greater(0, ret);

			db.Close();
		}

		public int EntryComparison(DatabaseEntry dbt1,
		     DatabaseEntry dbt2)
		{
			return dbt1.Data[0] - dbt2.Data[0];
		}

		[Test]
		public void TestHashFunction()
		{
			testName = "TestHashFunction";
			SetUpTest(true);
			string dbFileName = testHome + "/" + testName + ".db";

			HashDatabaseConfig dbConfig = new HashDatabaseConfig();
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.HashFunction = new HashFunctionDelegate(HashFunction);
			HashDatabase db = HashDatabase.Open(dbFileName, dbConfig);

			// Hash function will change the lowest byte to 0;
			uint data = db.HashFunction(BitConverter.GetBytes(1));
			Assert.AreEqual(0, data);
			db.Close();
		}

		public uint HashFunction(byte[] data)
		{
			data[0] = 0;
			return BitConverter.ToUInt32(data, 0);
		}

		[Test]
		public void TestOpenExistingHashDB()
		{
			testName = "TestOpenExistingHashDB";
			SetUpTest(true);
			string dbFileName = testHome + "/" + testName + ".db";

			HashDatabaseConfig hashConfig =
			    new HashDatabaseConfig();
			hashConfig.Creation = CreatePolicy.ALWAYS;
			HashDatabase hashDB = HashDatabase.Open(dbFileName, hashConfig);
			hashDB.Close();

			DatabaseConfig dbConfig = new DatabaseConfig();
			Database db = Database.Open(dbFileName, dbConfig);
			Assert.AreEqual(db.Type, DatabaseType.HASH);
			db.Close();
		}

		[Test]
		public void TestMessageFile()
		{
			testName = "TestMessageFile";
			SetUpTest(true);

			// Configure and open an environment.
			DatabaseEnvironmentConfig envConfig =
			    new DatabaseEnvironmentConfig();
			envConfig.Create = true;
			envConfig.UseMPool = true;
			DatabaseEnvironment env = DatabaseEnvironment.Open(
				testHome, envConfig);

			// Configure and open a database.
			HashDatabaseConfig DBConfig =
			    new HashDatabaseConfig();
			DBConfig.Env = env;
			DBConfig.Creation = CreatePolicy.IF_NEEDED;

			string DBFileName = testName + ".db";
			HashDatabase db = HashDatabase.Open(DBFileName, DBConfig);

			// Confirm message file does not exist.
			string messageFile = testHome + "/" + "msgfile";
			Assert.AreEqual(false, File.Exists(messageFile));

			// Call set_msgfile() of db.
			db.Msgfile = messageFile;

			// Print db statistic to message file.
			db.PrintStats(true);

			// Confirm message file exists now.
			Assert.AreEqual(true, File.Exists(messageFile));

			db.Msgfile = "";
			string line = null;

			// Read the third line of message file.
			System.IO.StreamReader file = new System.IO.StreamReader(@"" + messageFile);
			line = file.ReadLine();
			line = file.ReadLine();
			line = file.ReadLine();

			// Confirm the message file is not empty.
			Assert.AreEqual(line, "DB handle information:");
			file.Close();

			// Close database and environment.
			db.Close();
			env.Close();
		}

		[Test]
		public void TestOpenNewHashDB()
		{
			testName = "TestOpenNewHashDB";
			SetUpTest(true);
			string dbFileName = testHome + "/" + testName + ".db";

			XmlElement xmlElem = Configuration.TestSetUp(testFixtureName, testName);
			HashDatabaseConfig hashConfig = new HashDatabaseConfig();
			HashDatabaseConfigTest.Config(xmlElem, ref hashConfig, true);
			HashDatabase hashDB = HashDatabase.Open(dbFileName, hashConfig);
			Confirm(xmlElem, hashDB, true);
			hashDB.Close();
		}

		[Test, ExpectedException(typeof(ExpectedTestException))]
		public void TestPutNoDuplicateWithUnsortedDuplicate()
		{
			testName = "TestPutNoDuplicateWithUnsortedDuplicate";
			SetUpTest(true);
			string dbFileName = testHome + "/" + testName + ".db";

			HashDatabaseConfig hashConfig = new HashDatabaseConfig();
			hashConfig.Creation = CreatePolicy.ALWAYS;
			hashConfig.Duplicates = DuplicatesPolicy.UNSORTED;
			hashConfig.ErrorPrefix = testName;

			HashDatabase hashDB = HashDatabase.Open(dbFileName, hashConfig);
			DatabaseEntry key, data;
			key = new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("1"));
			data = new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("1"));

			try
			{
				hashDB.PutNoDuplicate(key, data);
			}
			catch (DatabaseException)
			{
				throw new ExpectedTestException();
			}
			finally
			{
				hashDB.Close();
			}
		}

		[Test, ExpectedException(typeof(ExpectedTestException))]
		public void TestKeyExistException()
		{
			testName = "TestKeyExistException";
			SetUpTest(true);
			string dbFileName = testHome + "/" + testName + ".db";

			HashDatabaseConfig hashConfig = new HashDatabaseConfig();
			hashConfig.Creation = CreatePolicy.ALWAYS;
			hashConfig.Duplicates = DuplicatesPolicy.SORTED;
			HashDatabase hashDB = HashDatabase.Open(dbFileName, hashConfig);

			// Put the same record into db twice.
			DatabaseEntry key, data;
			key = new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("1"));
			data = new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("1"));
			try
			{
				hashDB.PutNoDuplicate(key, data);
				hashDB.PutNoDuplicate(key, data);
			}
			catch (KeyExistException)
			{
				throw new ExpectedTestException();
			}
			finally
			{
				hashDB.Close();
			}
		}

		[Test]
		public void TestPutNoDuplicate()
		{
			testName = "TestPutNoDuplicate";
			SetUpTest(true);
			string dbFileName = testHome + "/" + testName + ".db";

			HashDatabaseConfig hashConfig =
			    new HashDatabaseConfig();
			hashConfig.Creation = CreatePolicy.ALWAYS;
			hashConfig.Duplicates = DuplicatesPolicy.SORTED;
			hashConfig.TableSize = 20;
			HashDatabase hashDB = HashDatabase.Open(dbFileName, hashConfig);

			DatabaseEntry key, data;
			for (int i = 1; i <= 10; i++)
			{
				key = new DatabaseEntry(BitConverter.GetBytes(i));
				data = new DatabaseEntry(BitConverter.GetBytes(i));
				hashDB.PutNoDuplicate(key, data);
			}

			Assert.IsTrue(hashDB.Exists(
			    new DatabaseEntry(BitConverter.GetBytes((int)5))));

			hashDB.Close();
		}

		[Test, ExpectedException(typeof(ExpectedTestException))]
		public void TestPutNoDuplicateWithTxn()
		{
			testName = "TestPutNoDuplicateWithTxn";
			SetUpTest(true);

			// Open an environment.
			DatabaseEnvironmentConfig envConfig = 
			    new DatabaseEnvironmentConfig();
			envConfig.Create = true;
			envConfig.UseLogging = true;
			envConfig.UseMPool = true;
			envConfig.UseTxns = true;
			DatabaseEnvironment env = DatabaseEnvironment.Open(
			    testHome, envConfig);

			// Open a hash database within a transaction.
			Transaction txn = env.BeginTransaction();
			HashDatabaseConfig dbConfig = new HashDatabaseConfig();
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.Duplicates = DuplicatesPolicy.SORTED;
			dbConfig.Env = env;
			HashDatabase db = HashDatabase.Open(testName + ".db", dbConfig, txn);

			DatabaseEntry dbt = new DatabaseEntry(BitConverter.GetBytes((int)100));
			db.PutNoDuplicate(dbt, dbt, txn);
			try
			{
				db.PutNoDuplicate(dbt, dbt, txn);
			}
			catch (KeyExistException)
			{
				throw new ExpectedTestException();
			}
			finally
			{
				// Close all.
				db.Close();
				txn.Commit();
				env.Close();
			}
		}

		[Test]
		public void TestStats()
		{
			testName = "TestStats";
			SetUpTest(true);
			string dbFileName = testHome + "/" + testName + ".db";

			HashDatabaseConfig dbConfig = new HashDatabaseConfig();
			ConfigCase1(dbConfig);
			HashDatabase db = HashDatabase.Open(dbFileName, dbConfig);

			HashStats stats = db.Stats();
			HashStats fastStats = db.FastStats();
			ConfirmStatsPart1Case1(stats);
			ConfirmStatsPart1Case1(fastStats);

			// Put 100 records into the database.
			PutRecordCase1(db, null);

			stats = db.Stats();
			ConfirmStatsPart2Case1(stats);

			// Delete some data to get some free pages.
			byte[] bigArray = new byte[262144];
			db.Delete(new DatabaseEntry(bigArray));
			stats = db.Stats();
			ConfirmStatsPart3Case1(stats);

			db.Close();
		}

		[Test]
		public void TestStatsInTxn()
		{
			testName = "TestStatsInTxn";
			SetUpTest(true);

			StatsInTxn(testHome, testName, false);
		}

		[Test]
		public void TestStatsWithIsolation()
		{
			testName = "TestStatsWithIsolation";
			SetUpTest(true);

			StatsInTxn(testHome, testName, true);
		}

        private int dbIntCompare(DatabaseEntry dbt1, DatabaseEntry dbt2) {
            int a, b;
            a = BitConverter.ToInt32(dbt1.Data, 0);
            b = BitConverter.ToInt32(dbt2.Data, 0);
            return a - b;
        }

		public void StatsInTxn(string home, string name, bool ifIsolation)
		{
			DatabaseEnvironmentConfig envConfig =
			    new DatabaseEnvironmentConfig();
			EnvConfigCase1(envConfig);
			DatabaseEnvironment env = DatabaseEnvironment.Open(home, envConfig);

			Transaction openTxn = env.BeginTransaction();
			HashDatabaseConfig dbConfig = new HashDatabaseConfig();
			ConfigCase1(dbConfig);
			dbConfig.Env = env;
			HashDatabase db = HashDatabase.Open(name + ".db", dbConfig, openTxn);
			openTxn.Commit();

			Transaction statsTxn = env.BeginTransaction();
			HashStats stats;
			HashStats fastStats;
			if (ifIsolation == false)
			{
				stats = db.Stats(statsTxn);
				fastStats = db.Stats(statsTxn);
			}
			else
			{
				stats = db.Stats(statsTxn, Isolation.DEGREE_ONE);
				fastStats = db.Stats(statsTxn, Isolation.DEGREE_ONE);
			}
			
			ConfirmStatsPart1Case1(stats);

			// Put 100 records into the database.
			PutRecordCase1(db, statsTxn);

			if (ifIsolation == false)
				stats = db.Stats(statsTxn);
			else
				stats = db.Stats(statsTxn, Isolation.DEGREE_TWO);
			ConfirmStatsPart2Case1(stats);

			// Delete some data to get some free pages.
			byte[] bigArray = new byte[262144];
			db.Delete(new DatabaseEntry(bigArray), statsTxn);
			if (ifIsolation == false)
				stats = db.Stats(statsTxn);
			else
				stats = db.Stats(statsTxn, Isolation.DEGREE_THREE);
			ConfirmStatsPart3Case1(stats);

			statsTxn.Commit();
			db.Close();
			env.Close();
		}

		public void EnvConfigCase1(DatabaseEnvironmentConfig cfg)
		{
			cfg.Create = true;
			cfg.UseTxns = true;
			cfg.UseMPool = true;
			cfg.UseLogging = true;
		}

		public void ConfigCase1(HashDatabaseConfig dbConfig)
		{
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.Duplicates = DuplicatesPolicy.UNSORTED;
			dbConfig.FillFactor = 10;
			dbConfig.TableSize = 20;
			dbConfig.PageSize = 4096;
		}

		public void PutRecordCase1(HashDatabase db, Transaction txn)
		{
			byte[] bigArray = new byte[262144];
			for (int i = 0; i < 50; i++)
			{
				if (txn == null)
					db.Put(new DatabaseEntry(BitConverter.GetBytes(i)),
					    new DatabaseEntry(BitConverter.GetBytes(i)));
				else
					db.Put(new DatabaseEntry(BitConverter.GetBytes(i)),
					    new DatabaseEntry(BitConverter.GetBytes(i)), txn);
			}
			for (int i = 50; i < 100; i++)
			{
				if (txn == null)
					db.Put(new DatabaseEntry(bigArray),
					    new DatabaseEntry(bigArray));
				else
					db.Put(new DatabaseEntry(bigArray),
					    new DatabaseEntry(bigArray), txn);
			}
		}

		public void ConfirmStatsPart1Case1(HashStats stats)
		{
			Assert.AreEqual(10, stats.FillFactor);
			Assert.AreEqual(4096, stats.PageSize);
			Assert.AreEqual(10, stats.Version);
		}

		public void ConfirmStatsPart2Case1(HashStats stats)
		{
			Assert.AreNotEqual(0, stats.BigPages);
			Assert.AreNotEqual(0, stats.BigPagesFreeBytes);
			Assert.AreNotEqual(0, stats.BucketPagesFreeBytes);
			Assert.AreNotEqual(0, stats.DuplicatePages);
			Assert.AreNotEqual(0, stats.DuplicatePagesFreeBytes);
			Assert.AreNotEqual(0, stats.MagicNumber);
			Assert.AreNotEqual(0, stats.MetadataFlags);
			Assert.AreEqual(100, stats.nData);
			Assert.AreNotEqual(0, stats.nHashBuckets);
			Assert.AreEqual(51, stats.nKeys);
			Assert.AreNotEqual(0, stats.nPages);
			Assert.AreEqual(0, stats.OverflowPages);
			Assert.AreEqual(0, stats.OverflowPagesFreeBytes);
		}

		public void ConfirmStatsPart3Case1(HashStats stats)
		{
			Assert.AreNotEqual(0, stats.FreePages);
		}

		public static void Confirm(XmlElement xmlElem,
		    HashDatabase hashDB, bool compulsory)
		{
			DatabaseTest.Confirm(xmlElem, hashDB, compulsory);
			Configuration.ConfirmCreatePolicy(xmlElem,
			    "Creation", hashDB.Creation, compulsory);
			Configuration.ConfirmDuplicatesPolicy(xmlElem,
			    "Duplicates", hashDB.Duplicates, compulsory);
			Configuration.ConfirmUint(xmlElem,
			    "FillFactor", hashDB.FillFactor, compulsory);
			Configuration.ConfirmUint(xmlElem,
			    "NumElements", hashDB.TableSize,
			    compulsory);
			Assert.AreEqual(DatabaseType.HASH, hashDB.Type);
			string type = hashDB.Type.ToString();
			Assert.IsNotNull(type);
		}
	}
}