Package org.h2.expression.condition
Class CompareLike
- java.lang.Object
-
- org.h2.expression.Expression
-
- org.h2.expression.condition.Condition
-
- org.h2.expression.condition.CompareLike
-
-
Nested Class Summary
Nested Classes Modifier and Type Class Description static class
CompareLike.LikeType
The type of comparison.
-
Field Summary
Fields Modifier and Type Field Description private static int
ANY
private CompareMode
compareMode
private java.lang.String
defaultEscape
private Expression
escape
private boolean
fastCompare
private boolean
ignoreCase
private boolean
invalidPattern
private boolean
isInit
private Expression
left
private CompareLike.LikeType
likeType
private static int
MATCH
private boolean
not
private static int
ONE
private char[]
patternChars
private int
patternLength
private java.util.regex.Pattern
patternRegexp
private java.lang.String
patternString
private int[]
patternTypes
one of MATCH / ONE / ANYprivate Expression
right
private boolean
shortcutToContains
indicates that we can shortcut the comparison and use containsprivate boolean
shortcutToEndsWith
indicates that we can shortcut the comparison and use endsWithprivate boolean
shortcutToStartsWith
indicates that we can shortcut the comparison and use startsWithprivate boolean
whenOperand
-
Fields inherited from class org.h2.expression.Expression
AUTO_PARENTHESES, MAP_IN_AGGREGATE, MAP_IN_WINDOW, MAP_INITIAL, WITH_PARENTHESES, WITHOUT_PARENTHESES
-
Fields inherited from interface org.h2.util.HasSQL
ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS
-
-
Constructor Summary
Constructors Constructor Description CompareLike(Database db, Expression left, boolean not, boolean whenOperand, Expression right, Expression escape, CompareLike.LikeType likeType)
CompareLike(CompareMode compareMode, java.lang.String defaultEscape, Expression left, boolean not, boolean whenOperand, Expression right, Expression escape, CompareLike.LikeType likeType)
-
Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description private boolean
compare(char[] pattern, java.lang.String s, int pi, int si)
private boolean
compareAt(java.lang.String s, int pi, int si, int sLen, char[] pattern, int[] types)
private static boolean
containsIgnoreCase(java.lang.String src, java.lang.String what)
void
createIndexConditions(SessionLocal session, TableFilter filter)
Create index conditions if possible and attach them to the table filter.int
getCost()
Estimate the cost to process the expression.private static java.lang.Character
getEscapeChar(java.lang.String s)
private java.lang.Character
getEscapeChar(Value e)
Expression
getNotIfPossible(SessionLocal session)
If it is possible, return the negated expression.Expression
getSubexpression(int index)
Returns subexpression with specified index.int
getSubexpressionCount()
Returns count of subexpressions.java.lang.StringBuilder
getUnenclosedSQL(java.lang.StringBuilder builder, int sqlFlags)
Get the SQL statement of this expression.Value
getValue(SessionLocal session)
Return the resulting value for the current row.private Value
getValue(SessionLocal session, Value left)
java.lang.StringBuilder
getWhenSQL(java.lang.StringBuilder builder, int sqlFlags)
Appends the SQL statement of this when operand to the specified builder.boolean
getWhenValue(SessionLocal session, Value left)
Return the resulting value of when operand for the current row.void
initPattern(java.lang.String p, java.lang.Character escapeChar)
Initializes the pattern.boolean
isEverything(ExpressionVisitor visitor)
Check if this expression and all sub-expressions can fulfill a criteria.private boolean
isFullMatch()
boolean
isWhenConditionOperand()
Returns whether this expression is a right side of condition in a when operand.void
mapColumns(ColumnResolver resolver, int level, int state)
Map the columns of the resolver to expression columns.boolean
needParentheses()
Returns whether this expressions needs to be wrapped in parentheses when it is used as an argument of other expressions.Expression
optimize(SessionLocal session)
Try to optimize the expression.void
setEvaluatable(TableFilter tableFilter, boolean b)
Tell the expression columns whether the table filter can return values now.boolean
test(java.lang.String value)
Test if the value matches the initialized pattern.boolean
test(java.lang.String testPattern, java.lang.String value, char escapeChar)
Test if the value matches the pattern.void
updateAggregate(SessionLocal session, int stage)
Update an aggregate value.-
Methods inherited from class org.h2.expression.condition.Condition
castToBoolean, getType
-
Methods inherited from class org.h2.expression.Expression
addFilterConditions, getAlias, getBooleanValue, getColumnName, getColumnNameForView, getEnclosedSQL, getNonAliasExpression, getNullable, getSchemaName, getSQL, getSQL, getSQL, getSQL, getTableAlias, getTableName, isConstant, isIdentity, isNullConstant, isValueSet, optimizeCondition, toString, writeExpressions, writeExpressions
-
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
-
Methods inherited from interface org.h2.util.HasSQL
getTraceSQL
-
-
-
-
Field Detail
-
MATCH
private static final int MATCH
- See Also:
- Constant Field Values
-
ONE
private static final int ONE
- See Also:
- Constant Field Values
-
ANY
private static final int ANY
- See Also:
- Constant Field Values
-
compareMode
private final CompareMode compareMode
-
defaultEscape
private final java.lang.String defaultEscape
-
likeType
private final CompareLike.LikeType likeType
-
left
private Expression left
-
not
private final boolean not
-
whenOperand
private final boolean whenOperand
-
right
private Expression right
-
escape
private Expression escape
-
isInit
private boolean isInit
-
patternChars
private char[] patternChars
-
patternString
private java.lang.String patternString
-
patternTypes
private int[] patternTypes
one of MATCH / ONE / ANY
-
patternLength
private int patternLength
-
patternRegexp
private java.util.regex.Pattern patternRegexp
-
ignoreCase
private boolean ignoreCase
-
fastCompare
private boolean fastCompare
-
invalidPattern
private boolean invalidPattern
-
shortcutToStartsWith
private boolean shortcutToStartsWith
indicates that we can shortcut the comparison and use startsWith
-
shortcutToEndsWith
private boolean shortcutToEndsWith
indicates that we can shortcut the comparison and use endsWith
-
shortcutToContains
private boolean shortcutToContains
indicates that we can shortcut the comparison and use contains
-
-
Constructor Detail
-
CompareLike
public CompareLike(Database db, Expression left, boolean not, boolean whenOperand, Expression right, Expression escape, CompareLike.LikeType likeType)
-
CompareLike
public CompareLike(CompareMode compareMode, java.lang.String defaultEscape, Expression left, boolean not, boolean whenOperand, Expression right, Expression escape, CompareLike.LikeType likeType)
-
-
Method Detail
-
getEscapeChar
private static java.lang.Character getEscapeChar(java.lang.String s)
-
needParentheses
public boolean needParentheses()
Description copied from class:Expression
Returns whether this expressions needs to be wrapped in parentheses when it is used as an argument of other expressions.- Overrides:
needParentheses
in classExpression
- Returns:
true
if it is
-
getUnenclosedSQL
public java.lang.StringBuilder getUnenclosedSQL(java.lang.StringBuilder builder, int sqlFlags)
Description copied from class:Expression
Get the SQL statement of this expression. This may not always be the original SQL statement, especially after optimization. Enclosing '(' and ')' are never appended.- Specified by:
getUnenclosedSQL
in classExpression
- Parameters:
builder
- string buildersqlFlags
- formatting flags- Returns:
- the specified string builder
-
getWhenSQL
public java.lang.StringBuilder getWhenSQL(java.lang.StringBuilder builder, int sqlFlags)
Description copied from class:Expression
Appends the SQL statement of this when operand to the specified builder.- Overrides:
getWhenSQL
in classExpression
- Parameters:
builder
- string buildersqlFlags
- formatting flags- Returns:
- the specified string builder
-
optimize
public Expression optimize(SessionLocal session)
Description copied from class:Expression
Try to optimize the expression.- Specified by:
optimize
in classExpression
- Parameters:
session
- the session- Returns:
- the optimized expression
-
getEscapeChar
private java.lang.Character getEscapeChar(Value e)
-
createIndexConditions
public void createIndexConditions(SessionLocal session, TableFilter filter)
Description copied from class:Expression
Create index conditions if possible and attach them to the table filter.- Overrides:
createIndexConditions
in classExpression
- Parameters:
session
- the sessionfilter
- the table filter
-
getValue
public Value getValue(SessionLocal session)
Description copied from class:Expression
Return the resulting value for the current row.- Specified by:
getValue
in classExpression
- Parameters:
session
- the session- Returns:
- the result
-
getWhenValue
public boolean getWhenValue(SessionLocal session, Value left)
Description copied from class:Expression
Return the resulting value of when operand for the current row.- Overrides:
getWhenValue
in classExpression
- Parameters:
session
- the sessionleft
- value on the left side- Returns:
- the result
-
getValue
private Value getValue(SessionLocal session, Value left)
-
containsIgnoreCase
private static boolean containsIgnoreCase(java.lang.String src, java.lang.String what)
-
compareAt
private boolean compareAt(java.lang.String s, int pi, int si, int sLen, char[] pattern, int[] types)
-
compare
private boolean compare(char[] pattern, java.lang.String s, int pi, int si)
-
isWhenConditionOperand
public boolean isWhenConditionOperand()
Description copied from class:Expression
Returns whether this expression is a right side of condition in a when operand.- Overrides:
isWhenConditionOperand
in classExpression
- Returns:
true
if it is,false
otherwise
-
test
public boolean test(java.lang.String testPattern, java.lang.String value, char escapeChar)
Test if the value matches the pattern.- Parameters:
testPattern
- the patternvalue
- the valueescapeChar
- the escape character- Returns:
- true if the value matches
-
test
public boolean test(java.lang.String value)
Test if the value matches the initialized pattern.- Parameters:
value
- the value- Returns:
- true if the value matches
-
initPattern
public void initPattern(java.lang.String p, java.lang.Character escapeChar)
Initializes the pattern.- Parameters:
p
- the patternescapeChar
- the escape character
-
isFullMatch
private boolean isFullMatch()
-
getNotIfPossible
public Expression getNotIfPossible(SessionLocal session)
Description copied from class:Expression
If it is possible, return the negated expression. This is used to optimize NOT expressions: NOT ID>10 can be converted to ID<=10. Returns null if negating is not possible.- Overrides:
getNotIfPossible
in classExpression
- Parameters:
session
- the session- Returns:
- the negated expression, or null
-
mapColumns
public void mapColumns(ColumnResolver resolver, int level, int state)
Description copied from class:Expression
Map the columns of the resolver to expression columns.- Specified by:
mapColumns
in classExpression
- Parameters:
resolver
- the column resolverlevel
- the subquery nesting levelstate
- current state for nesting checks, initial value isExpression.MAP_INITIAL
-
setEvaluatable
public void setEvaluatable(TableFilter tableFilter, boolean b)
Description copied from class:Expression
Tell the expression columns whether the table filter can return values now. This is used when optimizing the query.- Specified by:
setEvaluatable
in classExpression
- Parameters:
tableFilter
- the table filterb
- true if the table filter can return value
-
updateAggregate
public void updateAggregate(SessionLocal session, int stage)
Description copied from class:Expression
Update an aggregate value. This method is called at statement execution time. It is usually called once for each row, but if the expression is used multiple times (for example in the column list, and as part of the HAVING expression) it is called multiple times - the row counter needs to be used to make sure the internal state is only updated once.- Specified by:
updateAggregate
in classExpression
- Parameters:
session
- the sessionstage
- select stage
-
isEverything
public boolean isEverything(ExpressionVisitor visitor)
Description copied from class:Expression
Check if this expression and all sub-expressions can fulfill a criteria. If any part returns false, the result is false.- Specified by:
isEverything
in classExpression
- Parameters:
visitor
- the visitor- Returns:
- if the criteria can be fulfilled
-
getCost
public int getCost()
Description copied from class:Expression
Estimate the cost to process the expression. Used when optimizing the query, to calculate the query plan with the lowest estimated cost.- Specified by:
getCost
in classExpression
- Returns:
- the estimated cost
-
getSubexpressionCount
public int getSubexpressionCount()
Description copied from class:Expression
Returns count of subexpressions.- Overrides:
getSubexpressionCount
in classExpression
- Returns:
- count of subexpressions
-
getSubexpression
public Expression getSubexpression(int index)
Description copied from class:Expression
Returns subexpression with specified index.- Overrides:
getSubexpression
in classExpression
- Parameters:
index
- 0-based index- Returns:
- subexpression with specified index, may be null
-
-