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JDBC wrapper for the DataStax CQL Java Driver.
/*
*
* Licensed 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 com.github.adejanovski.cassandra.jdbc;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URLDecoder;
import java.nio.ByteBuffer;
import java.sql.SQLException;
import java.sql.SQLNonTransientConnectionException;
import java.sql.SQLSyntaxErrorException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.datastax.driver.core.policies.*;
import com.datastax.driver.core.policies.LatencyAwarePolicy.Builder;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
/**
* A set of static utility methods used by the JDBC Suite, and various default values and error message strings
* that can be shared across classes.
*/
public class Utils
{
private static final Pattern KEYSPACE_PATTERN = Pattern.compile("USE (\\w+);?", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);
private static final Pattern SELECT_PATTERN = Pattern.compile("(?:SELECT|DELETE)\\s+.+\\s+FROM\\s+(\\w+).*", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);
private static final Pattern UPDATE_PATTERN = Pattern.compile("UPDATE\\s+(\\w+)\\s+.*", Pattern.CASE_INSENSITIVE);
public static final String PROTOCOL = "jdbc:cassandra:";
public static final String DEFAULT_HOST = "localhost";
public static final int DEFAULT_PORT = 9042;
public static final com.datastax.driver.core.ConsistencyLevel DEFAULT_CONSISTENCY = com.datastax.driver.core.ConsistencyLevel.ONE;
public static final String KEY_VERSION = "version";
public static final String KEY_CONSISTENCY = "consistency";
public static final String KEY_PRIMARY_DC = "primarydc";
public static final String KEY_BACKUP_DC = "backupdc";
public static final String KEY_CONNECTION_RETRIES = "retries";
public static final String KEY_LOADBALANCING_POLICY = "loadbalancing";
public static final String KEY_RETRY_POLICY = "retry";
public static final String KEY_RECONNECT_POLICY = "reconnection";
public static final String KEY_DEBUG = "debug";
//public static final String KEY_PRIMARY_DC = "primarydc";
public static final String TAG_DESCRIPTION = "description";
public static final String TAG_USER = "user";
public static final String TAG_PASSWORD = "password";
public static final String TAG_DATABASE_NAME = "databaseName";
public static final String TAG_SERVER_NAME = "serverName";
public static final String TAG_PORT_NUMBER = "portNumber";
public static final String TAG_ACTIVE_CQL_VERSION = "activeCqlVersion";
public static final String TAG_CQL_VERSION = "cqlVersion";
public static final String TAG_BUILD_VERSION = "buildVersion";
public static final String TAG_THRIFT_VERSION = "thriftVersion";
public static final String TAG_CONSISTENCY_LEVEL = "consistencyLevel";
public static final String TAG_LOADBALANCING_POLICY = "loadBalancing";
public static final String TAG_RETRY_POLICY = "retry";
public static final String TAG_RECONNECT_POLICY = "reconnection";
public static final String TAG_DEBUG = "debug";
public static final String TAG_PRIMARY_DC = "primaryDatacenter";
public static final String TAG_BACKUP_DC = "backupDatacenter";
public static final String TAG_CONNECTION_RETRIES = "retries";
protected static final String WAS_CLOSED_CON = "method was called on a closed Connection";
protected static final String WAS_CLOSED_STMT = "method was called on a closed Statement";
protected static final String WAS_CLOSED_RSLT = "method was called on a closed ResultSet";
protected static final String NO_INTERFACE = "no object was found that matched the provided interface: %s";
protected static final String NO_TRANSACTIONS = "the Cassandra implementation does not support transactions";
protected static final String NO_SERVER = "no Cassandra server is available";
protected static final String ALWAYS_AUTOCOMMIT = "the Cassandra implementation is always in auto-commit mode";
protected static final String BAD_TIMEOUT = "the timeout value was less than zero";
protected static final String SCHEMA_MISMATCH = "schema does not match across nodes, (try again later)";
public static final String NOT_SUPPORTED = "the Cassandra implementation does not support this method";
protected static final String NO_GEN_KEYS = "the Cassandra implementation does not currently support returning generated keys";
protected static final String NO_BATCH = "the Cassandra implementation does not currently support this batch in Statement";
protected static final String NO_MULTIPLE = "the Cassandra implementation does not currently support multiple open Result Sets";
protected static final String NO_VALIDATOR = "Could not find key validator for: %s.%s";
protected static final String NO_COMPARATOR = "Could not find key comparator for: %s.%s";
protected static final String NO_RESULTSET = "No ResultSet returned from the CQL statement passed in an 'executeQuery()' method";
protected static final String NO_UPDATE_COUNT = "No Update Count was returned from the CQL statement passed in an 'executeUpdate()' method";
protected static final String NO_CF = "no column family reference could be extracted from the provided CQL statement";
protected static final String BAD_KEEP_RSET = "the argument for keeping the current result set : %s is not a valid value";
protected static final String BAD_TYPE_RSET = "the argument for result set type : %s is not a valid value";
protected static final String BAD_CONCUR_RSET = "the argument for result set concurrency : %s is not a valid value";
protected static final String BAD_HOLD_RSET = "the argument for result set holdability : %s is not a valid value";
protected static final String BAD_FETCH_DIR = "fetch direction value of : %s is illegal";
protected static final String BAD_AUTO_GEN = "auto key generation value of : %s is illegal";
protected static final String BAD_FETCH_SIZE = "fetch size of : %s rows may not be negative";
protected static final String MUST_BE_POSITIVE = "index must be a positive number less or equal the count of returned columns: %s";
protected static final String VALID_LABELS = "name provided was not in the list of valid column labels: %s";
protected static final String NOT_TRANSLATABLE = "column was stored in %s format which is not translatable to %s";
protected static final String NOT_BOOLEAN = "string value was neither 'true' nor 'false' : %s";
protected static final String HOST_IN_URL = "Connection url must specify a host, e.g., jdbc:cassandra://localhost:9042/Keyspace1";
protected static final String HOST_REQUIRED = "a 'host' name is required to build a Connection";
protected static final String BAD_KEYSPACE = "Keyspace names must be composed of alphanumerics and underscores (parsed: '%s')";
protected static final String URI_IS_SIMPLE = "Connection url may only include host, port, and keyspace, consistency and version option, e.g., jdbc:cassandra://localhost:9042/Keyspace1?version=3.0.0&consistency=ONE";
protected static final String NOT_OPTION = "Connection url only supports the 'version' and 'consistency' options";
protected static final String FORWARD_ONLY = "Can not position cursor with a type of TYPE_FORWARD_ONLY";
protected static final Logger logger = LoggerFactory.getLogger(Utils.class);
/**
* Parse a URL for the Cassandra JDBC Driver
*
* The URL must start with the Protocol: "jdbc:cassandra:"
* The URI part(the "Subname") must contain a host and an optional port and optional keyspace name
* ie. "//localhost:9160/Test1"
*
* @param url The full JDBC URL to be parsed
* @return A list of properties that were parsed from the Subname
* @throws SQLException
*/
public static final Properties parseURL(String url) throws SQLException
{
Properties props = new Properties();
if (!(url == null))
{
props.setProperty(TAG_PORT_NUMBER, "" + DEFAULT_PORT);
String rawUri = url.substring(PROTOCOL.length());
URI uri = null;
try
{
uri = new URI(rawUri);
}
catch (URISyntaxException e)
{
throw new SQLSyntaxErrorException(e);
}
String host = uri.getHost();
if (host == null) throw new SQLNonTransientConnectionException(HOST_IN_URL);
props.setProperty(TAG_SERVER_NAME, host);
int port = uri.getPort() >= 0 ? uri.getPort() : DEFAULT_PORT;
props.setProperty(TAG_PORT_NUMBER, "" + port);
String keyspace = uri.getPath();
if ((keyspace != null) && (!keyspace.isEmpty()))
{
if (keyspace.startsWith("/")) keyspace = keyspace.substring(1);
if (!keyspace.matches("[a-zA-Z]\\w+"))
throw new SQLNonTransientConnectionException(String.format(BAD_KEYSPACE, keyspace));
props.setProperty(TAG_DATABASE_NAME, keyspace);
}
if (uri.getUserInfo() != null)
throw new SQLNonTransientConnectionException(URI_IS_SIMPLE);
String query = uri.getQuery();
if ((query != null) && (!query.isEmpty()))
{
Map params = parseQueryPart(query);
if (params.containsKey(KEY_VERSION) )
{
props.setProperty(TAG_CQL_VERSION,params.get(KEY_VERSION));
}
if (params.containsKey(KEY_DEBUG) )
{
props.setProperty(TAG_DEBUG,params.get(KEY_DEBUG));
}
if (params.containsKey(KEY_CONSISTENCY) )
{
props.setProperty(TAG_CONSISTENCY_LEVEL,params.get(KEY_CONSISTENCY));
}
if (params.containsKey(KEY_PRIMARY_DC) )
{
props.setProperty(TAG_PRIMARY_DC,params.get(KEY_PRIMARY_DC));
}
if (params.containsKey(KEY_BACKUP_DC) )
{
props.setProperty(TAG_BACKUP_DC,params.get(KEY_BACKUP_DC));
}
if (params.containsKey(KEY_CONNECTION_RETRIES) )
{
props.setProperty(TAG_CONNECTION_RETRIES,params.get(KEY_CONNECTION_RETRIES));
}
if (params.containsKey(KEY_LOADBALANCING_POLICY)){
props.setProperty(TAG_LOADBALANCING_POLICY, params.get(KEY_LOADBALANCING_POLICY));
}
if (params.containsKey(KEY_RETRY_POLICY)){
props.setProperty(TAG_RETRY_POLICY, params.get(KEY_RETRY_POLICY));
}
if (params.containsKey(KEY_RECONNECT_POLICY)){
props.setProperty(TAG_RECONNECT_POLICY, params.get(KEY_RECONNECT_POLICY));
}
}
}
if (logger.isTraceEnabled()) logger.trace("URL : '{}' parses to: {}", url, props);
return props;
}
/**
* Create a "Subname" portion of a JDBC URL from properties.
*
* @param props A Properties file containing all the properties to be considered.
* @return A constructed "Subname" portion of a JDBC URL in the form of a CLI (ie: //myhost:9160/Test1?version=3.0.0 )
* @throws SQLException
*/
public static final String createSubName(Properties props)throws SQLException
{
// make keyspace always start with a "/" for URI
String keyspace = props.getProperty(TAG_DATABASE_NAME);
// if keyspace is null then do not bother ...
if (keyspace != null)
if (!keyspace.startsWith("/")) keyspace = "/" + keyspace;
String host = props.getProperty(TAG_SERVER_NAME);
if (host==null)throw new SQLNonTransientConnectionException(HOST_REQUIRED);
// construct a valid URI from parts...
URI uri;
try
{
uri = new URI(
null,
null,
host,
props.getProperty(TAG_PORT_NUMBER)==null ? DEFAULT_PORT : Integer.parseInt(props.getProperty(TAG_PORT_NUMBER)),
keyspace,
makeQueryString(props),
null);
}
catch (Exception e)
{
throw new SQLNonTransientConnectionException(e);
}
if (logger.isTraceEnabled()) logger.trace("Subname : '{}' created from : {}",uri.toString(), props);
return uri.toString();
}
/**
* Determine the current keyspace by inspecting the CQL string to see if a USE statement is provided; which would change the keyspace.
*
* @param cql A CQL query string
* @param current The current keyspace stored as state in the connection
* @return the provided keyspace name or the keyspace from the contents of the CQL string
*/
public static String determineCurrentKeyspace(String cql, String current)
{
String ks = current;
Matcher isKeyspace = KEYSPACE_PATTERN.matcher(cql);
if (isKeyspace.matches()) ks = isKeyspace.group(1);
return ks;
}
/**
* Determine the current column family by inspecting the CQL to find a CF reference.
*
* @param cql A CQL query string
* @return The column family name from the contents of the CQL string or null in none was found
*/
public static String determineCurrentColumnFamily(String cql)
{
String cf = null;
Matcher isSelect = SELECT_PATTERN.matcher(cql);
if (isSelect.matches()) cf = isSelect.group(1);
Matcher isUpdate = UPDATE_PATTERN.matcher(cql);
if (isUpdate.matches()) cf = isUpdate.group(1);
return cf;
}
// Utility method
/**
* Utility method to pack bytes into a byte buffer from a list of ByteBuffers
*
* @param buffers A list of ByteBuffers representing the elements to pack
* @param elements The count of the elements
* @param size The size in bytes of the result buffer
* @return The packed ByteBuffer
*/
protected static ByteBuffer pack(List buffers, int elements, int size)
{
ByteBuffer result = ByteBuffer.allocate(2 + size);
result.putShort((short)elements);
for (ByteBuffer bb : buffers)
{
result.putShort((short)bb.remaining());
result.put(bb.duplicate());
}
return (ByteBuffer)result.flip();
}
protected static String makeQueryString(Properties props)
{
StringBuilder sb = new StringBuilder();
String version = (props.getProperty(TAG_CQL_VERSION));
String consistency = (props.getProperty(TAG_CONSISTENCY_LEVEL));
if (consistency!=null) sb.append(KEY_CONSISTENCY).append("=").append(consistency);
if (version!=null)
{
if (sb.length() != 0) sb.append("&");
sb.append(KEY_VERSION).append("=").append(version);
}
return (sb.length()==0) ? null : sb.toString().trim();
}
protected static Map parseQueryPart(String query) throws SQLException
{
Map params = new HashMap();
for (String param : query.split("&"))
{
try
{
String pair[] = param.split("=");
String key = URLDecoder.decode(pair[0], "UTF-8").toLowerCase();
String value = "";
if (pair.length > 1) value = URLDecoder.decode(pair[1], "UTF-8");
params.put(key, value);
}
catch (UnsupportedEncodingException e)
{
throw new SQLSyntaxErrorException(e);
}
}
return params;
}
public static LinkedHashSet parseSet(String itemType, String value){
if(itemType.equals("varchar") || itemType.equals("text") || itemType.equals("ascii")){
LinkedHashSet zeSet = new LinkedHashSet();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeSet.add(val);
}
return zeSet;
}else if(itemType.equals("bigint")){
LinkedHashSet zeSet = Sets.newLinkedHashSet();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeSet.add(Long.parseLong(val.trim()));
}
return zeSet;
}else if(itemType.equals("varint")){
LinkedHashSet zeSet = Sets.newLinkedHashSet();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeSet.add(BigInteger.valueOf(Long.parseLong(val.trim())));
}
return zeSet;
}else if(itemType.equals("decimal")){
LinkedHashSet zeSet = Sets.newLinkedHashSet();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeSet.add(BigDecimal.valueOf(Double.parseDouble(val.trim())));
}
return zeSet;
}else if(itemType.equals("double")){
LinkedHashSet zeSet = Sets.newLinkedHashSet();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeSet.add(Double.parseDouble(val.trim()));
}
return zeSet;
}else if(itemType.equals("float")){
LinkedHashSet zeSet = Sets.newLinkedHashSet();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeSet.add(Float.parseFloat(val.trim()));
}
return zeSet;
}else if(itemType.equals("boolean")){
LinkedHashSet zeSet = Sets.newLinkedHashSet();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeSet.add(Boolean.parseBoolean(val.trim()));
}
return zeSet;
}else if(itemType.equals("int")){
LinkedHashSet zeSet = Sets.newLinkedHashSet();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeSet.add(Integer.parseInt(val.trim()));
}
return zeSet;
}else if(itemType.equals("uuid")){
LinkedHashSet zeSet = Sets.newLinkedHashSet();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeSet.add(UUID.fromString(val.trim()));
}
return zeSet;
}else if(itemType.equals("timeuuid")){
LinkedHashSet zeSet = Sets.newLinkedHashSet();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeSet.add(UUID.fromString(val.trim()));
}
return zeSet;
}
return null;
}
public static ArrayList parseList(String itemType, String value){
if(itemType.equals("varchar") || itemType.equals("text") || itemType.equals("ascii")){
ArrayList zeList = Lists.newArrayList();
String[] values = value.replace("[", "").replace("]", "").split(", ");
int i=0;
for(String val:values){
if(i>0 && val.startsWith(" ")){
zeList.add(val.substring(1));
}else{
zeList.add(val);
}
i++;
}
return zeList;
}else if(itemType.equals("bigint")){
ArrayList zeList = Lists.newArrayList();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeList.add(Long.parseLong(val.trim()));
}
return zeList;
}else if(itemType.equals("varint")){
ArrayList zeList = Lists.newArrayList();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeList.add(BigInteger.valueOf(Long.parseLong(val.trim())));
}
return zeList;
}else if(itemType.equals("decimal")){
ArrayList zeList = Lists.newArrayList();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeList.add(BigDecimal.valueOf(Double.parseDouble(val.trim())));
}
return zeList;
}else if(itemType.equals("double")){
ArrayList zeList = Lists.newArrayList();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeList.add(Double.parseDouble(val.trim()));
}
return zeList;
}else if(itemType.equals("float")){
ArrayList zeList = Lists.newArrayList();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeList.add(Float.parseFloat(val.trim()));
}
return zeList;
}else if(itemType.equals("boolean")){
ArrayList zeList = Lists.newArrayList();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeList.add(Boolean.parseBoolean(val.trim()));
}
return zeList;
}else if(itemType.equals("int")){
ArrayList zeList = Lists.newArrayList();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeList.add(Integer.parseInt(val.trim()));
}
return zeList;
}else if(itemType.equals("uuid")){
ArrayList zeList = Lists.newArrayList();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeList.add(UUID.fromString(val.trim()));
}
return zeList;
}else if(itemType.equals("timeuuid")){
ArrayList zeList = Lists.newArrayList();
String[] values = value.replace("[", "").replace("]", "").split(", ");
for(String val:values){
zeList.add(UUID.fromString(val.trim()));
}
return zeList;
}
return null;
}
@SuppressWarnings({ "boxing", "unchecked", "rawtypes" })
public static HashMap parseMap(String kType, String vType, String value){
//Parsing values looking like this :
//{key1:val1, key2:val2}
Map zeMap = new HashMap();
String[] values = value.replace("{", "").replace("}", "").split(", ");
List keys = Lists.newArrayList();
List vals = Lists.newArrayList();
for(String val:values){
String[] keyVal = val.split("=");
if(kType.equals("bigint")){
keys.add(Long.parseLong(keyVal[0]));
}else if(kType.equals("varint")){
keys.add(BigInteger.valueOf(Long.parseLong(keyVal[0])));
}else if(kType.equals("decimal")){
keys.add(BigDecimal.valueOf(Double.parseDouble(keyVal[0])));
}else if(kType.equals("double")){
keys.add(Double.parseDouble(keyVal[0]));
}else if(kType.equals("float")){
keys.add(Float.parseFloat(keyVal[0]));
}else if(kType.equals("boolean")){
keys.add(Boolean.parseBoolean(keyVal[0]));
}else if(kType.equals("int")){
keys.add(Integer.parseInt(keyVal[0]));
}else if(kType.equals("uuid")){
keys.add(UUID.fromString(keyVal[0]));
}else if(kType.equals("timeuuid")){
keys.add(UUID.fromString(keyVal[0]));
}else{
keys.add(keyVal[0]);
}
if(vType.equals("bigint")){
vals.add(Long.parseLong(keyVal[1]));
}else if(vType.equals("varint")){
vals.add(BigInteger.valueOf(Long.parseLong(keyVal[1])));
}else if(vType.equals("decimal")){
vals.add(BigDecimal.valueOf(Double.parseDouble(keyVal[1])));
}else if(vType.equals("double")){
vals.add(Double.parseDouble(keyVal[1]));
}else if(vType.equals("float")){
vals.add(Float.parseFloat(keyVal[1]));
}else if(vType.equals("boolean")){
vals.add(Boolean.parseBoolean(keyVal[1]));
}else if(vType.equals("int")){
vals.add(Integer.parseInt(keyVal[1]));
}else if(vType.equals("uuid")){
vals.add(UUID.fromString(keyVal[1]));
}else if(vType.equals("timeuuid")){
vals.add(UUID.fromString(keyVal[1]));
}else{
vals.add(keyVal[1]);
}
zeMap.put(keys.get(keys.size()-1), vals.get(vals.size()-1));
}
return (HashMap) zeMap;
}
public static LoadBalancingPolicy parseLbPolicy(String loadBalancingPolicyString) throws InstantiationException, IllegalAccessException, ClassNotFoundException, NoSuchMethodException, SecurityException, IllegalArgumentException, InvocationTargetException{
String lb_regex = "([a-zA-Z\\.]*Policy)(\\()(.*)(\\))";
Pattern lb_pattern = Pattern.compile(lb_regex);
Matcher lb_matcher = lb_pattern.matcher(loadBalancingPolicyString);
if(lb_matcher.matches()){
if(lb_matcher.groupCount()>0){
// Primary LB policy has been specified
String primaryLoadBalancingPolicy = lb_matcher.group(1);
String loadBalancingPolicyParams = lb_matcher.group(3);
return getLbPolicy(primaryLoadBalancingPolicy, loadBalancingPolicyParams);
}
}
return null;
}
public static LoadBalancingPolicy getLbPolicy(String lbString, String parameters) throws ClassNotFoundException, NoSuchMethodException, SecurityException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException{
LoadBalancingPolicy policy = null;
//LoadBalancingPolicy childPolicy = null;
if(!lbString.contains(".")){
if(lbString.toLowerCase().contains("dcawareroundrobinpolicy")){
lbString="com.github.adejanovski.cassandra.jdbc.policies."+ lbString;
}
else{
lbString="com.datastax.driver.core.policies."+ lbString;
}
}
if(parameters.length()>0){
// Child policy or parameters have been specified
System.out.println("parameters = " + parameters);
String paramsRegex = "([^,]+\\(.+?\\))|([^,]+)";
//String lb_regex = "([a-zA-Z]*Policy)(\\()(.*)(\\))";
Pattern param_pattern = Pattern.compile(paramsRegex);
Matcher lb_matcher = param_pattern.matcher(parameters);
ArrayList