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Code Issues Releases Wiki Activity

fixed sonar rule violations

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This commit is contained in:
wenshao
2012-08-29 09:48:05 +08:00
parent fe50086568
commit ae675075cd
4 changed files with 748 additions and 839 deletions
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src/main/java/com/alibaba/druid/filter/FilterChain.java
+660 -706
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File diff suppressed because it is too large Load Diff
src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlStatementParser.java
+51 -51
View File
@@ -130,33 +130,33 @@ import com.alibaba.druid.sql.parser.Token;
public class MySqlStatementParser extends SQLStatementParser {
public MySqlStatementParser(String sql) throws ParserException{
super (new MySqlExprParser(sql));
super(new MySqlExprParser(sql));
}
public MySqlStatementParser(Lexer lexer){
super(new MySqlExprParser(lexer));
}
public SQLCreateTableStatement parseCreateTable() throws ParserException {
public SQLCreateTableStatement parseCreateTable() {
MySqlCreateTableParser parser = new MySqlCreateTableParser(this.exprParser);
return parser.parseCrateTable();
}
public SQLSelectStatement parseSelect() throws ParserException {
public SQLSelectStatement parseSelect() {
return new SQLSelectStatement(new MySqlSelectParser(this.exprParser).select());
}
public SQLUpdateStatement parseUpdateStatement() throws ParserException {
public SQLUpdateStatement parseUpdateStatement() {
MySqlUpdateStatement stmt = createUpdateStatement();
if (lexer.token() == Token.UPDATE) {
lexer.nextToken();
if (identifierEquals("LOW_PRIORITY")) {
lexer.nextToken();
stmt.setLowPriority(true);
}
if (identifierEquals("IGNORE")) {
lexer.nextToken();
stmt.setIgnore(true);
@@ -192,7 +192,7 @@ public class MySqlStatementParser extends SQLStatementParser {
lexer.nextToken();
stmt.setWhere(this.exprParser.expr());
}
stmt.setOrderBy(this.exprParser.parseOrderBy());
stmt.setLimit(parseLimit());
@@ -204,7 +204,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return new MySqlUpdateStatement();
}
public MySqlDeleteStatement parseDeleteStatement() throws ParserException {
public MySqlDeleteStatement parseDeleteStatement() {
MySqlDeleteStatement deleteStatement = new MySqlDeleteStatement();
if (lexer.token() == Token.DELETE) {
@@ -264,18 +264,18 @@ public class MySqlStatementParser extends SQLStatementParser {
return deleteStatement;
}
public SQLStatement parseCreate() throws ParserException {
public SQLStatement parseCreate() {
accept(Token.CREATE);
List<SQLCommentHint> hints = this.exprParser.parseHints();
if (lexer.token() == Token.TABLE || identifierEquals("TEMPORARY")) {
MySqlCreateTableParser parser = new MySqlCreateTableParser(this.exprParser);
MySqlCreateTableStatement stmt = parser.parseCrateTable(false);
stmt.setHints(hints);
return stmt;
}
if (lexer.token() == Token.DATABASE) {
return parseCreateDatabase();
}
@@ -292,7 +292,7 @@ public class MySqlStatementParser extends SQLStatementParser {
throw new ParserException("TODO " + lexer.token());
}
public SQLStatement parseCreateIndex() throws ParserException {
public SQLStatement parseCreateIndex() {
MySqlCreateIndexStatement stmt = new MySqlCreateIndexStatement();
if (lexer.token() == Token.UNIQUE) {
@@ -350,7 +350,7 @@ public class MySqlStatementParser extends SQLStatementParser {
}
}
public SQLStatement parseCreateUser() throws ParserException {
public SQLStatement parseCreateUser() {
if (lexer.token() == Token.CREATE) {
lexer.nextToken();
}
@@ -510,7 +510,7 @@ public class MySqlStatementParser extends SQLStatementParser {
statementList.add(stmt);
return true;
}
if (identifierEquals("HELP")) {
lexer.nextToken();
MySqlHelpStatement stmt = new MySqlHelpStatement();
@@ -524,14 +524,14 @@ public class MySqlStatementParser extends SQLStatementParser {
statementList.add(stmt);
return true;
}
if (lexer.token() == Token.LOCK) {
lexer.nextToken();
acceptIdentifier("TABLES");
MySqlLockTableStatement stmt = new MySqlLockTableStatement();
stmt.setTableSource(this.exprParser.name());
if (identifierEquals("READ")) {
lexer.nextToken();
if (identifierEquals("LOCAL")) {
@@ -547,11 +547,11 @@ public class MySqlStatementParser extends SQLStatementParser {
acceptIdentifier("WRITE");
stmt.setLockType(LockType.LOW_PRIORITY_WRITE);
}
statementList.add(stmt);
return true;
}
if (identifierEquals("UNLOCK")) {
lexer.nextToken();
acceptIdentifier("TABLES");
@@ -562,7 +562,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return false;
}
public MySqlDescribeStatement parseDescribe() throws ParserException {
public MySqlDescribeStatement parseDescribe() {
if (lexer.token() == Token.DESC || identifierEquals("DESCRIBE")) {
lexer.nextToken();
} else {
@@ -575,7 +575,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return stmt;
}
public SQLStatement parseShow() throws ParserException {
public SQLStatement parseShow() {
acceptIdentifier("SHOW");
if (lexer.token() == Token.FULL) {
@@ -1235,7 +1235,7 @@ public class MySqlStatementParser extends SQLStatementParser {
throw new ParserException("TODO " + lexer.stringVal());
}
private MySqlShowStatusStatement parseShowStatus() throws ParserException {
private MySqlShowStatusStatement parseShowStatus() {
MySqlShowStatusStatement stmt = new MySqlShowStatusStatement();
if (lexer.token() == Token.LIKE) {
@@ -1253,7 +1253,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return stmt;
}
private MySqlShowVariantsStatement parseShowVariants() throws ParserException {
private MySqlShowVariantsStatement parseShowVariants() {
MySqlShowVariantsStatement stmt = new MySqlShowVariantsStatement();
if (lexer.token() == Token.LIKE) {
@@ -1271,7 +1271,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return stmt;
}
private MySqlShowWarningsStatement parseShowWarnings() throws ParserException {
private MySqlShowWarningsStatement parseShowWarnings() {
MySqlShowWarningsStatement stmt = new MySqlShowWarningsStatement();
stmt.setLimit(parseLimit());
@@ -1279,7 +1279,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return stmt;
}
private MySqlShowDatabasesStatement parseShowDatabases() throws ParserException {
private MySqlShowDatabasesStatement parseShowDatabases() {
MySqlShowDatabasesStatement stmt = new MySqlShowDatabasesStatement();
if (lexer.token() == Token.LIKE) {
@@ -1297,7 +1297,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return stmt;
}
private MySqlShowTablesStatement parseShowTabless() throws ParserException {
private MySqlShowTablesStatement parseShowTabless() {
MySqlShowTablesStatement stmt = new MySqlShowTablesStatement();
if (lexer.token() == Token.FROM) {
@@ -1321,7 +1321,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return stmt;
}
private MySqlShowColumnsStatement parseShowColumns() throws ParserException {
private MySqlShowColumnsStatement parseShowColumns() {
MySqlShowColumnsStatement stmt = new MySqlShowColumnsStatement();
if (lexer.token() == Token.FROM) {
@@ -1351,7 +1351,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return stmt;
}
public MySqlStartTransactionStatement parseStart() throws ParserException {
public MySqlStartTransactionStatement parseStart() {
acceptIdentifier("START");
acceptIdentifier("TRANSACTION");
@@ -1397,21 +1397,21 @@ public class MySqlStatementParser extends SQLStatementParser {
stmt.setChain(Boolean.TRUE);
}
}
if (identifierEquals("TO")) {
lexer.nextToken();
if (identifierEquals("SAVEPOINT")) {
lexer.nextToken();
}
stmt.setTo(this.exprParser.name());
}
return stmt;
}
public MySqlCommitStatement parseCommit() throws ParserException {
public MySqlCommitStatement parseCommit() {
acceptIdentifier("COMMIT");
MySqlCommitStatement stmt = new MySqlCommitStatement();
@@ -1436,7 +1436,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return stmt;
}
public MySqlReplaceStatement parseReplicate() throws ParserException {
public MySqlReplaceStatement parseReplicate() {
MySqlReplaceStatement stmt = new MySqlReplaceStatement();
acceptIdentifier("REPLACE");
@@ -1520,7 +1520,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return stmt;
}
protected SQLStatement parseLoad() throws ParserException {
protected SQLStatement parseLoad() {
acceptIdentifier("LOAD");
if (identifierEquals("DATA")) {
@@ -1536,7 +1536,7 @@ public class MySqlStatementParser extends SQLStatementParser {
throw new ParserException("TODO");
}
protected MySqlLoadXmlStatement parseLoadXml() throws ParserException {
protected MySqlLoadXmlStatement parseLoadXml() {
acceptIdentifier("XML");
MySqlLoadXmlStatement stmt = new MySqlLoadXmlStatement();
@@ -1609,7 +1609,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return stmt;
}
protected MySqlLoadDataInFileStatement parseLoadDataInFile() throws ParserException {
protected MySqlLoadDataInFileStatement parseLoadDataInFile() {
acceptIdentifier("DATA");
MySqlLoadDataInFileStatement stmt = new MySqlLoadDataInFileStatement();
@@ -1682,7 +1682,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return stmt;
}
public MySqlPrepareStatement parsePrepare() throws ParserException {
public MySqlPrepareStatement parsePrepare() {
acceptIdentifier("PREPARE");
SQLName name = exprParser.name();
@@ -1692,7 +1692,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return new MySqlPrepareStatement(name, from);
}
public MySqlExecuteStatement parseExecute() throws ParserException {
public MySqlExecuteStatement parseExecute() {
acceptIdentifier("EXECUTE");
MySqlExecuteStatement stmt = new MySqlExecuteStatement();
@@ -1825,7 +1825,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return insertStatement;
}
public SQLStatement parseDropUser() throws ParserException {
public SQLStatement parseDropUser() {
acceptIdentifier("USER");
MySqlDropUser stmt = new MySqlDropUser();
@@ -1923,7 +1923,7 @@ public class MySqlStatementParser extends SQLStatementParser {
return new MySqlSelectParser(this.exprParser);
}
public SQLStatement parseSet() throws ParserException {
public SQLStatement parseSet() {
accept(Token.SET);
Boolean global = null;
@@ -2071,14 +2071,14 @@ public class MySqlStatementParser extends SQLStatementParser {
} else if (lexer.token() == Token.INDEX) {
lexer.nextToken();
MySqlAlterTableAddIndex item = new MySqlAlterTableAddIndex();
if (lexer.token() == Token.LPAREN) {
lexer.nextToken();
} else {
item.setName(this.exprParser.name());
accept(Token.LPAREN);
}
for (;;) {
SQLSelectOrderByItem column = this.exprParser.parseSelectOrderByItem();
item.getItems().add(column);
@@ -2094,14 +2094,14 @@ public class MySqlStatementParser extends SQLStatementParser {
} else if (lexer.token() == Token.UNIQUE) {
lexer.nextToken();
MySqlAlterTableAddUnique item = new MySqlAlterTableAddUnique();
if (lexer.token() == Token.LPAREN) {
lexer.nextToken();
} else {
item.setName(this.exprParser.name());
accept(Token.LPAREN);
}
for (;;) {
SQLSelectOrderByItem column = this.exprParser.parseSelectOrderByItem();
item.getItems().add(column);
@@ -2171,7 +2171,7 @@ public class MySqlStatementParser extends SQLStatementParser {
item.setName(stmt.getTableSource().getExpr());
item.setTo(this.exprParser.name());
renameStmt.getItems().add(item);
return renameStmt;
} else if (lexer.token() == Token.ORDER) {
throw new ParserException("TODO " + lexer.token() + " " + lexer.stringVal());
@@ -2243,7 +2243,7 @@ public class MySqlStatementParser extends SQLStatementParser {
} else {
break;
}
if (lexer.token() == Token.COMMA) {
lexer.nextToken();
continue;
@@ -2282,21 +2282,21 @@ public class MySqlStatementParser extends SQLStatementParser {
return stmt;
}
public SQLStatement parseCreateDatabase() {
if (lexer.token() == Token.CREATE) {
lexer.nextToken();
}
accept(Token.DATABASE);
SQLCreateDatabaseStatement stmt = new SQLCreateDatabaseStatement();
stmt.setName(this.exprParser.name());
if (lexer.token() == Token.DEFAULT) {
lexer.nextToken();
}
return stmt;
}
}
src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java
+37 -37
View File
@@ -67,7 +67,7 @@ import com.alibaba.druid.sql.ast.statement.SQLSelectOrderByItem;
public class SQLExprParser extends SQLParser {
public SQLExprParser(String sql) throws ParserException{
public SQLExprParser(String sql){
super(sql);
}
@@ -75,7 +75,7 @@ public class SQLExprParser extends SQLParser {
super(lexer);
}
public SQLExpr expr() throws ParserException {
public SQLExpr expr() {
if (lexer.token() == Token.STAR) {
lexer.nextToken();
@@ -91,7 +91,7 @@ public class SQLExprParser extends SQLParser {
return exprRest(expr);
}
public SQLExpr exprRest(SQLExpr expr) throws ParserException {
public SQLExpr exprRest(SQLExpr expr) {
expr = bitXorRest(expr);
expr = multiplicativeRest(expr);
expr = additiveRest(expr);
@@ -107,12 +107,12 @@ public class SQLExprParser extends SQLParser {
return expr;
}
public final SQLExpr bitXor() throws ParserException {
public final SQLExpr bitXor() {
SQLExpr expr = primary();
return bitXorRest(expr);
}
public SQLExpr bitXorRest(SQLExpr expr) throws ParserException {
public SQLExpr bitXorRest(SQLExpr expr) {
if (lexer.token() == Token.CARET) {
lexer.nextToken();
SQLExpr rightExp = primary();
@@ -123,12 +123,12 @@ public class SQLExprParser extends SQLParser {
return expr;
}
public final SQLExpr multiplicative() throws ParserException {
public final SQLExpr multiplicative() {
SQLExpr expr = primary();
return multiplicativeRest(expr);
}
public SQLExpr multiplicativeRest(SQLExpr expr) throws ParserException {
public SQLExpr multiplicativeRest(SQLExpr expr) {
if (lexer.token() == Token.STAR) {
lexer.nextToken();
SQLExpr rightExp = bitXor();
@@ -148,7 +148,7 @@ public class SQLExprParser extends SQLParser {
return expr;
}
public SQLExpr primary() throws ParserException {
public SQLExpr primary() {
SQLExpr sqlExpr = null;
final Token tok = lexer.token();
@@ -458,7 +458,7 @@ public class SQLExprParser extends SQLParser {
return new SQLSelectParser(this);
}
public SQLExpr primaryRest(SQLExpr expr) throws ParserException {
public SQLExpr primaryRest(SQLExpr expr) {
if (expr == null) {
throw new IllegalArgumentException("expr");
}
@@ -573,11 +573,11 @@ public class SQLExprParser extends SQLParser {
return expr;
}
public final SQLExpr groupComparisionRest(SQLExpr expr) throws ParserException {
public final SQLExpr groupComparisionRest(SQLExpr expr) {
return expr;
}
public final void names(Collection<SQLName> exprCol) throws ParserException {
public final void names(Collection<SQLName> exprCol) {
if (lexer.token() == Token.RBRACE) {
return;
}
@@ -594,7 +594,7 @@ public class SQLExprParser extends SQLParser {
}
}
public final void exprList(Collection<SQLExpr> exprCol) throws ParserException {
public final void exprList(Collection<SQLExpr> exprCol) {
if (lexer.token() == Token.RPAREN || lexer.token() == Token.RBRACKET) {
return;
}
@@ -613,7 +613,7 @@ public class SQLExprParser extends SQLParser {
}
}
public SQLName name() throws ParserException {
public SQLName name() {
String identName;
if (lexer.token() == Token.LITERAL_ALIAS) {
identName = '"' + lexer.stringVal() + '"';
@@ -636,7 +636,7 @@ public class SQLExprParser extends SQLParser {
return name;
}
public SQLName nameRest(SQLName name) throws ParserException {
public SQLName nameRest(SQLName name) {
if (lexer.token() == Token.DOT) {
lexer.nextToken();
@@ -675,7 +675,7 @@ public class SQLExprParser extends SQLParser {
return false;
}
protected SQLAggregateExpr parseAggregateExpr(String methodName) throws ParserException {
protected SQLAggregateExpr parseAggregateExpr(String methodName) {
methodName = methodName.toUpperCase();
SQLAggregateExpr aggregateExpr;
@@ -696,7 +696,7 @@ public class SQLExprParser extends SQLParser {
return aggregateExpr;
}
public SQLOrderBy parseOrderBy() throws ParserException {
public SQLOrderBy parseOrderBy() {
if (lexer.token() == Token.ORDER) {
SQLOrderBy orderBy = new SQLOrderBy();
@@ -717,7 +717,7 @@ public class SQLExprParser extends SQLParser {
return null;
}
public SQLSelectOrderByItem parseSelectOrderByItem() throws ParserException {
public SQLSelectOrderByItem parseSelectOrderByItem() {
SQLSelectOrderByItem item = new SQLSelectOrderByItem();
item.setExpr(expr());
@@ -733,12 +733,12 @@ public class SQLExprParser extends SQLParser {
return item;
}
public final SQLExpr bitAnd() throws ParserException {
public final SQLExpr bitAnd() {
SQLExpr expr = shift();
return bitAndRest(expr);
}
public final SQLExpr bitAndRest(SQLExpr expr) throws ParserException {
public final SQLExpr bitAndRest(SQLExpr expr) {
while (lexer.token() == Token.AMP) {
lexer.nextToken();
SQLExpr rightExp = shift();
@@ -747,12 +747,12 @@ public class SQLExprParser extends SQLParser {
return expr;
}
public final SQLExpr bitOr() throws ParserException {
public final SQLExpr bitOr() {
SQLExpr expr = bitAnd();
return bitOrRest(expr);
}
public final SQLExpr bitOrRest(SQLExpr expr) throws ParserException {
public final SQLExpr bitOrRest(SQLExpr expr) {
if (lexer.token() == Token.BAR) {
lexer.nextToken();
SQLExpr rightExp = bitAnd();
@@ -767,12 +767,12 @@ public class SQLExprParser extends SQLParser {
return expr;
}
public final SQLExpr equality() throws ParserException {
public final SQLExpr equality() {
SQLExpr expr = shift();
return equalityRest(expr);
}
public SQLExpr equalityRest(SQLExpr expr) throws ParserException {
public SQLExpr equalityRest(SQLExpr expr) {
SQLExpr rightExp;
if (lexer.token() == Token.EQ) {
lexer.nextToken();
@@ -797,7 +797,7 @@ public class SQLExprParser extends SQLParser {
return expr;
}
public final SQLExpr inRest(SQLExpr expr) throws ParserException {
public final SQLExpr inRest(SQLExpr expr) {
if (lexer.token() == Token.IN) {
lexer.nextToken();
accept(Token.LPAREN);
@@ -823,12 +823,12 @@ public class SQLExprParser extends SQLParser {
return expr;
}
public final SQLExpr additive() throws ParserException {
public final SQLExpr additive() {
SQLExpr expr = multiplicative();
return additiveRest(expr);
}
public SQLExpr additiveRest(SQLExpr expr) throws ParserException {
public SQLExpr additiveRest(SQLExpr expr) {
if (lexer.token() == Token.PLUS) {
lexer.nextToken();
SQLExpr rightExp = multiplicative();
@@ -851,12 +851,12 @@ public class SQLExprParser extends SQLParser {
return expr;
}
public final SQLExpr shift() throws ParserException {
public final SQLExpr shift() {
SQLExpr expr = additive();
return shiftRest(expr);
}
public SQLExpr shiftRest(SQLExpr expr) throws ParserException {
public SQLExpr shiftRest(SQLExpr expr) {
if (lexer.token() == Token.LTLT) {
lexer.nextToken();
SQLExpr rightExp = additive();
@@ -874,12 +874,12 @@ public class SQLExprParser extends SQLParser {
return expr;
}
public SQLExpr and() throws ParserException {
public SQLExpr and() {
SQLExpr expr = relational();
return andRest(expr);
}
public SQLExpr andRest(SQLExpr expr) throws ParserException {
public SQLExpr andRest(SQLExpr expr) {
for (;;) {
if (lexer.token() == Token.AND || lexer.token() == Token.AMPAMP) {
lexer.nextToken();
@@ -894,12 +894,12 @@ public class SQLExprParser extends SQLParser {
return expr;
}
public SQLExpr or() throws ParserException {
public SQLExpr or() {
SQLExpr expr = and();
return orRest(expr);
}
public SQLExpr orRest(SQLExpr expr) throws ParserException {
public SQLExpr orRest(SQLExpr expr) {
for (;;) {
if (lexer.token() == Token.OR) {
@@ -920,24 +920,24 @@ public class SQLExprParser extends SQLParser {
return expr;
}
public SQLExpr relational() throws ParserException {
public SQLExpr relational() {
SQLExpr expr = equality();
return relationalRest(expr);
}
public SQLExpr relationalRest(SQLExpr expr) throws ParserException {
public SQLExpr relationalRest(SQLExpr expr) {
SQLExpr rightExp;
if (lexer.token() == Token.LT) {
SQLBinaryOperator op = SQLBinaryOperator.LessThan;
lexer.nextToken();
if (lexer.token() == Token.EQ) {
lexer.nextToken();
op = SQLBinaryOperator.LessThanOrEqual;
}
rightExp = bitOr();
expr = new SQLBinaryOpExpr(expr, op, rightExp);
// expr = relationalRest(expr);
@@ -1086,7 +1086,7 @@ public class SQLExprParser extends SQLParser {
return expr;
}
public SQLDataType parseDataType() throws ParserException {
public SQLDataType parseDataType() {
if (lexer.token() == Token.DEFAULT || lexer.token() == Token.NOT || lexer.token() == Token.NULL) {
return null;
src/main/java/com/alibaba/druid/util/ConcurrentIdentityHashMap.java
-45
View File
@@ -19,9 +19,7 @@ import java.util.AbstractCollection;
import java.util.AbstractMap;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.ConcurrentModificationException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;
@@ -809,16 +807,6 @@ public class ConcurrentIdentityHashMap<K, V> extends AbstractMap<K, V> implement
return found;
}
/**
* Legacy method testing if some key maps into the specified value in this table. This method is identical in
* functionality to {@link #containsValue}, and exists solely to ensure full compatibility with class
* {@link Hashtable}, which supported this method prior to introduction of the Java Collections framework.
*
* @param value a value to search for
* @return <tt>true</tt> if and only if some key maps to the <tt>value</tt> argument in this table as determined by
* the <tt>equals</tt> method; <tt>false</tt> otherwise
* @throws NullPointerException if the specified value is null
*/
public boolean contains(Object value) {
return containsValue(value);
}
@@ -937,51 +925,18 @@ public class ConcurrentIdentityHashMap<K, V> extends AbstractMap<K, V> implement
}
}
/**
* Returns a {@link Set} view of the keys contained in this map. The set is backed by the map, so changes to the map
* are reflected in the set, and vice-versa. The set supports element removal, which removes the corresponding
* mapping from this map, via the <tt>Iterator.remove</tt>, <tt>Set.remove</tt>, <tt>removeAll</tt>,
* <tt>retainAll</tt>, and <tt>clear</tt> operations. It does not support the <tt>add</tt> or <tt>addAll</tt>
* operations.
* <p>
* The view's <tt>iterator</tt> is a "weakly consistent" iterator that will never throw
* {@link ConcurrentModificationException}, and guarantees to traverse elements as they existed upon construction of
* the iterator, and may (but is not guaranteed to) reflect any modifications subsequent to construction.
*/
@Override
public Set<K> keySet() {
Set<K> ks = keySet;
return ks != null ? ks : (keySet = new KeySet());
}
/**
* Returns a {@link Collection} view of the values contained in this map. The collection is backed by the map, so
* changes to the map are reflected in the collection, and vice-versa. The collection supports element removal,
* which removes the corresponding mapping from this map, via the <tt>Iterator.remove</tt>,
* <tt>Collection.remove</tt>, <tt>removeAll</tt>, <tt>retainAll</tt>, and <tt>clear</tt> operations. It does not
* support the <tt>add</tt> or <tt>addAll</tt> operations.
* <p>
* The view's <tt>iterator</tt> is a "weakly consistent" iterator that will never throw
* {@link ConcurrentModificationException}, and guarantees to traverse elements as they existed upon construction of
* the iterator, and may (but is not guaranteed to) reflect any modifications subsequent to construction.
*/
@Override
public Collection<V> values() {
Collection<V> vs = values;
return vs != null ? vs : (values = new Values());
}
/**
* Returns a {@link Set} view of the mappings contained in this map. The set is backed by the map, so changes to the
* map are reflected in the set, and vice-versa. The set supports element removal, which removes the corresponding
* mapping from the map, via the <tt>Iterator.remove</tt>, <tt>Set.remove</tt>, <tt>removeAll</tt>,
* <tt>retainAll</tt>, and <tt>clear</tt> operations. It does not support the <tt>add</tt> or <tt>addAll</tt>
* operations.
* <p>
* The view's <tt>iterator</tt> is a "weakly consistent" iterator that will never throw
* {@link ConcurrentModificationException}, and guarantees to traverse elements as they existed upon construction of
* the iterator, and may (but is not guaranteed to) reflect any modifications subsequent to construction.
*/
@Override
public Set<Map.Entry<K, V>> entrySet() {
Set<Map.Entry<K, V>> es = entrySet;