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Apache Commons DBCP software implements Database Connection Pooling
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.dbcp2;
import java.io.ByteArrayInputStream;
import java.nio.charset.StandardCharsets;
import java.sql.Connection;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.StringTokenizer;
import javax.naming.Context;
import javax.naming.Name;
import javax.naming.RefAddr;
import javax.naming.Reference;
import javax.naming.spi.ObjectFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.pool2.impl.BaseObjectPoolConfig;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
/**
*
* JNDI object factory that creates an instance of BasicDataSource that has been configured based on the
* RefAddr values of the specified Reference, which must match the names and data types of the
* BasicDataSource bean properties with the following exceptions:
*
*
* connectionInitSqls must be passed to this factory as a single String using semi-colon to delimit the
* statements whereas BasicDataSource requires a collection of Strings.
*
* @since 2.0
*/
public class BasicDataSourceFactory implements ObjectFactory {
private static final Log log = LogFactory.getLog(BasicDataSourceFactory.class);
private static final String PROP_DEFAULT_AUTO_COMMIT = "defaultAutoCommit";
private static final String PROP_DEFAULT_READ_ONLY = "defaultReadOnly";
private static final String PROP_DEFAULT_TRANSACTION_ISOLATION = "defaultTransactionIsolation";
private static final String PROP_DEFAULT_CATALOG = "defaultCatalog";
private static final String PROP_DEFAULT_SCHEMA = "defaultSchema";
private static final String PROP_CACHE_STATE = "cacheState";
private static final String PROP_DRIVER_CLASS_NAME = "driverClassName";
private static final String PROP_LIFO = "lifo";
private static final String PROP_MAX_TOTAL = "maxTotal";
private static final String PROP_MAX_IDLE = "maxIdle";
private static final String PROP_MIN_IDLE = "minIdle";
private static final String PROP_INITIAL_SIZE = "initialSize";
private static final String PROP_MAX_WAIT_MILLIS = "maxWaitMillis";
private static final String PROP_TEST_ON_CREATE = "testOnCreate";
private static final String PROP_TEST_ON_BORROW = "testOnBorrow";
private static final String PROP_TEST_ON_RETURN = "testOnReturn";
private static final String PROP_TIME_BETWEEN_EVICTION_RUNS_MILLIS = "timeBetweenEvictionRunsMillis";
private static final String PROP_NUM_TESTS_PER_EVICTION_RUN = "numTestsPerEvictionRun";
private static final String PROP_MIN_EVICTABLE_IDLE_TIME_MILLIS = "minEvictableIdleTimeMillis";
private static final String PROP_SOFT_MIN_EVICTABLE_IDLE_TIME_MILLIS = "softMinEvictableIdleTimeMillis";
private static final String PROP_EVICTION_POLICY_CLASS_NAME = "evictionPolicyClassName";
private static final String PROP_TEST_WHILE_IDLE = "testWhileIdle";
private static final String PROP_PASSWORD = "password";
private static final String PROP_URL = "url";
private static final String PROP_USER_NAME = "username";
private static final String PROP_VALIDATION_QUERY = "validationQuery";
private static final String PROP_VALIDATION_QUERY_TIMEOUT = "validationQueryTimeout";
private static final String PROP_JMX_NAME = "jmxName";
/**
* The property name for connectionInitSqls. The associated value String must be of the form [query;]*
*/
private static final String PROP_CONNECTION_INIT_SQLS = "connectionInitSqls";
private static final String PROP_ACCESS_TO_UNDERLYING_CONNECTION_ALLOWED = "accessToUnderlyingConnectionAllowed";
private static final String PROP_REMOVE_ABANDONED_ON_BORROW = "removeAbandonedOnBorrow";
private static final String PROP_REMOVE_ABANDONED_ON_MAINTENANCE = "removeAbandonedOnMaintenance";
private static final String PROP_REMOVE_ABANDONED_TIMEOUT = "removeAbandonedTimeout";
private static final String PROP_LOG_ABANDONED = "logAbandoned";
private static final String PROP_ABANDONED_USAGE_TRACKING = "abandonedUsageTracking";
private static final String PROP_POOL_PREPARED_STATEMENTS = "poolPreparedStatements";
private static final String PROP_MAX_OPEN_PREPARED_STATEMENTS = "maxOpenPreparedStatements";
private static final String PROP_CONNECTION_PROPERTIES = "connectionProperties";
private static final String PROP_MAX_CONN_LIFETIME_MILLIS = "maxConnLifetimeMillis";
private static final String PROP_LOG_EXPIRED_CONNECTIONS = "logExpiredConnections";
private static final String PROP_ROLLBACK_ON_RETURN = "rollbackOnReturn";
private static final String PROP_ENABLE_AUTO_COMMIT_ON_RETURN = "enableAutoCommitOnReturn";
private static final String PROP_DEFAULT_QUERY_TIMEOUT = "defaultQueryTimeout";
private static final String PROP_FAST_FAIL_VALIDATION = "fastFailValidation";
/**
* Value string must be of the form [STATE_CODE,]*
*/
private static final String PROP_DISCONNECTION_SQL_CODES = "disconnectionSqlCodes";
/*
* Block with obsolete properties from DBCP 1.x. Warn users that these are ignored and they should use the 2.x
* properties.
*/
private static final String NUPROP_MAX_ACTIVE = "maxActive";
private static final String NUPROP_REMOVE_ABANDONED = "removeAbandoned";
private static final String NUPROP_MAXWAIT = "maxWait";
/*
* Block with properties expected in a DataSource This props will not be listed as ignored - we know that they may
* appear in Resource, and not listing them as ignored.
*/
private static final String SILENT_PROP_FACTORY = "factory";
private static final String SILENT_PROP_SCOPE = "scope";
private static final String SILENT_PROP_SINGLETON = "singleton";
private static final String SILENT_PROP_AUTH = "auth";
private static final String[] ALL_PROPERTIES = {PROP_DEFAULT_AUTO_COMMIT, PROP_DEFAULT_READ_ONLY,
PROP_DEFAULT_TRANSACTION_ISOLATION, PROP_DEFAULT_CATALOG, PROP_DEFAULT_SCHEMA, PROP_CACHE_STATE,
PROP_DRIVER_CLASS_NAME, PROP_LIFO, PROP_MAX_TOTAL, PROP_MAX_IDLE, PROP_MIN_IDLE, PROP_INITIAL_SIZE,
PROP_MAX_WAIT_MILLIS, PROP_TEST_ON_CREATE, PROP_TEST_ON_BORROW, PROP_TEST_ON_RETURN,
PROP_TIME_BETWEEN_EVICTION_RUNS_MILLIS, PROP_NUM_TESTS_PER_EVICTION_RUN, PROP_MIN_EVICTABLE_IDLE_TIME_MILLIS,
PROP_SOFT_MIN_EVICTABLE_IDLE_TIME_MILLIS, PROP_EVICTION_POLICY_CLASS_NAME, PROP_TEST_WHILE_IDLE, PROP_PASSWORD,
PROP_URL, PROP_USER_NAME, PROP_VALIDATION_QUERY, PROP_VALIDATION_QUERY_TIMEOUT, PROP_CONNECTION_INIT_SQLS,
PROP_ACCESS_TO_UNDERLYING_CONNECTION_ALLOWED, PROP_REMOVE_ABANDONED_ON_BORROW, PROP_REMOVE_ABANDONED_ON_MAINTENANCE,
PROP_REMOVE_ABANDONED_TIMEOUT, PROP_LOG_ABANDONED, PROP_ABANDONED_USAGE_TRACKING, PROP_POOL_PREPARED_STATEMENTS,
PROP_MAX_OPEN_PREPARED_STATEMENTS, PROP_CONNECTION_PROPERTIES, PROP_MAX_CONN_LIFETIME_MILLIS,
PROP_LOG_EXPIRED_CONNECTIONS, PROP_ROLLBACK_ON_RETURN, PROP_ENABLE_AUTO_COMMIT_ON_RETURN,
PROP_DEFAULT_QUERY_TIMEOUT, PROP_FAST_FAIL_VALIDATION, PROP_DISCONNECTION_SQL_CODES, PROP_JMX_NAME };
/**
* Obsolete properties from DBCP 1.x. with warning strings suggesting new properties. LinkedHashMap will guarantee
* that properties will be listed to output in order of insertion into map.
*/
private static final Map NUPROP_WARNTEXT = new LinkedHashMap<>();
static {
NUPROP_WARNTEXT.put(NUPROP_MAX_ACTIVE,
"Property " + NUPROP_MAX_ACTIVE + " is not used in DBCP2, use " + PROP_MAX_TOTAL + " instead. "
+ PROP_MAX_TOTAL + " default value is " + GenericObjectPoolConfig.DEFAULT_MAX_TOTAL + ".");
NUPROP_WARNTEXT.put(NUPROP_REMOVE_ABANDONED,
"Property " + NUPROP_REMOVE_ABANDONED + " is not used in DBCP2," + " use one or both of "
+ PROP_REMOVE_ABANDONED_ON_BORROW + " or " + PROP_REMOVE_ABANDONED_ON_MAINTENANCE + " instead. "
+ "Both have default value set to false.");
NUPROP_WARNTEXT.put(NUPROP_MAXWAIT,
"Property " + NUPROP_MAXWAIT + " is not used in DBCP2" + " , use " + PROP_MAX_WAIT_MILLIS + " instead. "
+ PROP_MAX_WAIT_MILLIS + " default value is " + BaseObjectPoolConfig.DEFAULT_MAX_WAIT_MILLIS
+ ".");
}
/**
* Silent Properties. These properties will not be listed as ignored - we know that they may appear in JDBC Resource
* references, and we will not list them as ignored.
*/
private static final List SILENT_PROPERTIES = new ArrayList<>();
static {
SILENT_PROPERTIES.add(SILENT_PROP_FACTORY);
SILENT_PROPERTIES.add(SILENT_PROP_SCOPE);
SILENT_PROPERTIES.add(SILENT_PROP_SINGLETON);
SILENT_PROPERTIES.add(SILENT_PROP_AUTH);
}
// -------------------------------------------------- ObjectFactory Methods
/**
*
* Create and return a new BasicDataSource instance. If no instance can be created, return
* null instead.
*
*
* @param obj
* The possibly null object containing location or reference information that can be used in creating an
* object
* @param name
* The name of this object relative to nameCtx
* @param nameCtx
* The context relative to which the name parameter is specified, or null if
* name is relative to the default initial context
* @param environment
* The possibly null environment that is used in creating this object
*
* @throws Exception
* if an exception occurs creating the instance
*/
@Override
public Object getObjectInstance(final Object obj, final Name name, final Context nameCtx,
final Hashtable environment) throws Exception {
// We only know how to deal with javax.naming.References
// that specify a class name of "javax.sql.DataSource"
if (obj == null || !(obj instanceof Reference)) {
return null;
}
final Reference ref = (Reference) obj;
if (!"javax.sql.DataSource".equals(ref.getClassName())) {
return null;
}
// Check property names and log warnings about obsolete and / or unknown properties
final List warnings = new ArrayList<>();
final List infoMessages = new ArrayList<>();
validatePropertyNames(ref, name, warnings, infoMessages);
for (final String warning : warnings) {
log.warn(warning);
}
for (final String infoMessage : infoMessages) {
log.info(infoMessage);
}
final Properties properties = new Properties();
for (final String propertyName : ALL_PROPERTIES) {
final RefAddr ra = ref.get(propertyName);
if (ra != null) {
final String propertyValue = ra.getContent().toString();
properties.setProperty(propertyName, propertyValue);
}
}
return createDataSource(properties);
}
/**
* Collects warnings and info messages. Warnings are generated when an obsolete property is set. Unknown properties
* generate info messages.
*
* @param ref
* Reference to check properties of
* @param name
* Name provided to getObject
* @param warnings
* container for warning messages
* @param infoMessages
* container for info messages
*/
private void validatePropertyNames(final Reference ref, final Name name, final List warnings,
final List infoMessages) {
final List allPropsAsList = Arrays.asList(ALL_PROPERTIES);
final String nameString = name != null ? "Name = " + name.toString() + " " : "";
if (NUPROP_WARNTEXT != null && !NUPROP_WARNTEXT.keySet().isEmpty()) {
for (final String propertyName : NUPROP_WARNTEXT.keySet()) {
final RefAddr ra = ref.get(propertyName);
if (ra != null && !allPropsAsList.contains(ra.getType())) {
final StringBuilder stringBuilder = new StringBuilder(nameString);
final String propertyValue = ra.getContent().toString();
stringBuilder.append(NUPROP_WARNTEXT.get(propertyName)).append(" You have set value of \"")
.append(propertyValue).append("\" for \"").append(propertyName)
.append("\" property, which is being ignored.");
warnings.add(stringBuilder.toString());
}
}
}
final Enumeration allRefAddrs = ref.getAll();
while (allRefAddrs.hasMoreElements()) {
final RefAddr ra = allRefAddrs.nextElement();
final String propertyName = ra.getType();
// If property name is not in the properties list, we haven't warned on it
// and it is not in the "silent" list, tell user we are ignoring it.
if (!(allPropsAsList.contains(propertyName) || NUPROP_WARNTEXT.keySet().contains(propertyName)
|| SILENT_PROPERTIES.contains(propertyName))) {
final String propertyValue = ra.getContent().toString();
final StringBuilder stringBuilder = new StringBuilder(nameString);
stringBuilder.append("Ignoring unknown property: ").append("value of \"").append(propertyValue)
.append("\" for \"").append(propertyName).append("\" property");
infoMessages.add(stringBuilder.toString());
}
}
}
/**
* Creates and configures a {@link BasicDataSource} instance based on the given properties.
*
* @param properties
* The data source configuration properties.
* @return A new a {@link BasicDataSource} instance based on the given properties.
* @throws Exception
* Thrown when an error occurs creating the data source.
*/
public static BasicDataSource createDataSource(final Properties properties) throws Exception {
final BasicDataSource dataSource = new BasicDataSource();
String value = null;
value = properties.getProperty(PROP_DEFAULT_AUTO_COMMIT);
if (value != null) {
dataSource.setDefaultAutoCommit(Boolean.valueOf(value));
}
value = properties.getProperty(PROP_DEFAULT_READ_ONLY);
if (value != null) {
dataSource.setDefaultReadOnly(Boolean.valueOf(value));
}
value = properties.getProperty(PROP_DEFAULT_TRANSACTION_ISOLATION);
if (value != null) {
int level = PoolableConnectionFactory.UNKNOWN_TRANSACTION_ISOLATION;
if ("NONE".equalsIgnoreCase(value)) {
level = Connection.TRANSACTION_NONE;
} else if ("READ_COMMITTED".equalsIgnoreCase(value)) {
level = Connection.TRANSACTION_READ_COMMITTED;
} else if ("READ_UNCOMMITTED".equalsIgnoreCase(value)) {
level = Connection.TRANSACTION_READ_UNCOMMITTED;
} else if ("REPEATABLE_READ".equalsIgnoreCase(value)) {
level = Connection.TRANSACTION_REPEATABLE_READ;
} else if ("SERIALIZABLE".equalsIgnoreCase(value)) {
level = Connection.TRANSACTION_SERIALIZABLE;
} else {
try {
level = Integer.parseInt(value);
} catch (final NumberFormatException e) {
System.err.println("Could not parse defaultTransactionIsolation: " + value);
System.err.println("WARNING: defaultTransactionIsolation not set");
System.err.println("using default value of database driver");
level = PoolableConnectionFactory.UNKNOWN_TRANSACTION_ISOLATION;
}
}
dataSource.setDefaultTransactionIsolation(level);
}
value = properties.getProperty(PROP_DEFAULT_CATALOG);
if (value != null) {
dataSource.setDefaultCatalog(value);
}
value = properties.getProperty(PROP_DEFAULT_SCHEMA);
if (value != null) {
dataSource.setDefaultSchema(value);
}
value = properties.getProperty(PROP_CACHE_STATE);
if (value != null) {
dataSource.setCacheState(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_DRIVER_CLASS_NAME);
if (value != null) {
dataSource.setDriverClassName(value);
}
value = properties.getProperty(PROP_LIFO);
if (value != null) {
dataSource.setLifo(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_MAX_TOTAL);
if (value != null) {
dataSource.setMaxTotal(Integer.parseInt(value));
}
value = properties.getProperty(PROP_MAX_IDLE);
if (value != null) {
dataSource.setMaxIdle(Integer.parseInt(value));
}
value = properties.getProperty(PROP_MIN_IDLE);
if (value != null) {
dataSource.setMinIdle(Integer.parseInt(value));
}
value = properties.getProperty(PROP_INITIAL_SIZE);
if (value != null) {
dataSource.setInitialSize(Integer.parseInt(value));
}
value = properties.getProperty(PROP_MAX_WAIT_MILLIS);
if (value != null) {
dataSource.setMaxWaitMillis(Long.parseLong(value));
}
value = properties.getProperty(PROP_TEST_ON_CREATE);
if (value != null) {
dataSource.setTestOnCreate(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_TEST_ON_BORROW);
if (value != null) {
dataSource.setTestOnBorrow(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_TEST_ON_RETURN);
if (value != null) {
dataSource.setTestOnReturn(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_TIME_BETWEEN_EVICTION_RUNS_MILLIS);
if (value != null) {
dataSource.setTimeBetweenEvictionRunsMillis(Long.parseLong(value));
}
value = properties.getProperty(PROP_NUM_TESTS_PER_EVICTION_RUN);
if (value != null) {
dataSource.setNumTestsPerEvictionRun(Integer.parseInt(value));
}
value = properties.getProperty(PROP_MIN_EVICTABLE_IDLE_TIME_MILLIS);
if (value != null) {
dataSource.setMinEvictableIdleTimeMillis(Long.parseLong(value));
}
value = properties.getProperty(PROP_SOFT_MIN_EVICTABLE_IDLE_TIME_MILLIS);
if (value != null) {
dataSource.setSoftMinEvictableIdleTimeMillis(Long.parseLong(value));
}
value = properties.getProperty(PROP_EVICTION_POLICY_CLASS_NAME);
if (value != null) {
dataSource.setEvictionPolicyClassName(value);
}
value = properties.getProperty(PROP_TEST_WHILE_IDLE);
if (value != null) {
dataSource.setTestWhileIdle(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_PASSWORD);
if (value != null) {
dataSource.setPassword(value);
}
value = properties.getProperty(PROP_URL);
if (value != null) {
dataSource.setUrl(value);
}
value = properties.getProperty(PROP_USER_NAME);
if (value != null) {
dataSource.setUsername(value);
}
value = properties.getProperty(PROP_VALIDATION_QUERY);
if (value != null) {
dataSource.setValidationQuery(value);
}
value = properties.getProperty(PROP_VALIDATION_QUERY_TIMEOUT);
if (value != null) {
dataSource.setValidationQueryTimeout(Integer.parseInt(value));
}
value = properties.getProperty(PROP_ACCESS_TO_UNDERLYING_CONNECTION_ALLOWED);
if (value != null) {
dataSource.setAccessToUnderlyingConnectionAllowed(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_REMOVE_ABANDONED_ON_BORROW);
if (value != null) {
dataSource.setRemoveAbandonedOnBorrow(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_REMOVE_ABANDONED_ON_MAINTENANCE);
if (value != null) {
dataSource.setRemoveAbandonedOnMaintenance(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_REMOVE_ABANDONED_TIMEOUT);
if (value != null) {
dataSource.setRemoveAbandonedTimeout(Integer.parseInt(value));
}
value = properties.getProperty(PROP_LOG_ABANDONED);
if (value != null) {
dataSource.setLogAbandoned(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_ABANDONED_USAGE_TRACKING);
if (value != null) {
dataSource.setAbandonedUsageTracking(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_POOL_PREPARED_STATEMENTS);
if (value != null) {
dataSource.setPoolPreparedStatements(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_MAX_OPEN_PREPARED_STATEMENTS);
if (value != null) {
dataSource.setMaxOpenPreparedStatements(Integer.parseInt(value));
}
value = properties.getProperty(PROP_CONNECTION_INIT_SQLS);
if (value != null) {
dataSource.setConnectionInitSqls(parseList(value, ';'));
}
value = properties.getProperty(PROP_CONNECTION_PROPERTIES);
if (value != null) {
final Properties p = getProperties(value);
final Enumeration e = p.propertyNames();
while (e.hasMoreElements()) {
final String propertyName = (String) e.nextElement();
dataSource.addConnectionProperty(propertyName, p.getProperty(propertyName));
}
}
value = properties.getProperty(PROP_MAX_CONN_LIFETIME_MILLIS);
if (value != null) {
dataSource.setMaxConnLifetimeMillis(Long.parseLong(value));
}
value = properties.getProperty(PROP_LOG_EXPIRED_CONNECTIONS);
if (value != null) {
dataSource.setLogExpiredConnections(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_JMX_NAME);
if (value != null) {
dataSource.setJmxName(value);
}
value = properties.getProperty(PROP_ENABLE_AUTO_COMMIT_ON_RETURN);
if (value != null) {
dataSource.setAutoCommitOnReturn(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_ROLLBACK_ON_RETURN);
if (value != null) {
dataSource.setRollbackOnReturn(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_DEFAULT_QUERY_TIMEOUT);
if (value != null) {
dataSource.setDefaultQueryTimeout(Integer.valueOf(value));
}
value = properties.getProperty(PROP_FAST_FAIL_VALIDATION);
if (value != null) {
dataSource.setFastFailValidation(Boolean.valueOf(value).booleanValue());
}
value = properties.getProperty(PROP_DISCONNECTION_SQL_CODES);
if (value != null) {
dataSource.setDisconnectionSqlCodes(parseList(value, ','));
}
// DBCP-215
// Trick to make sure that initialSize connections are created
if (dataSource.getInitialSize() > 0) {
dataSource.getLogWriter();
}
// Return the configured DataSource instance
return dataSource;
}
/**
*
* Parse properties from the string. Format of the string must be [propertyName=property;]*
*
*
* @param propText
* @return Properties
* @throws Exception
*/
private static Properties getProperties(final String propText) throws Exception {
final Properties p = new Properties();
if (propText != null) {
p.load(new ByteArrayInputStream(propText.replace(';', '\n').getBytes(StandardCharsets.ISO_8859_1)));
}
return p;
}
/**
* Parse list of property values from a delimited string
*
* @param value
* delimited list of values
* @param delimiter
* character used to separate values in the list
* @return String Collection of values
*/
private static Collection parseList(final String value, final char delimiter) {
final StringTokenizer tokenizer = new StringTokenizer(value, Character.toString(delimiter));
final Collection tokens = new ArrayList<>(tokenizer.countTokens());
while (tokenizer.hasMoreTokens()) {
tokens.add(tokenizer.nextToken());
}
return tokens;
}
}