com.espertech.esper.client.soda

Class ExpressionBase

java.lang.Object

com.espertech.esper.client.soda.ExpressionBase

All Implemented Interfaces:

Expression, Serializable

Direct Known Subclasses:

AccessProjectionExpressionBase, ArithmaticExpression, ArrayExpression, AvedevProjectionExpression, AvgProjectionExpression, BetweenExpression, BitwiseOpExpression, CaseSwitchExpression, CaseWhenThenExpression, CastExpression, CoalesceExpression, CompareListExpression, ConcatExpression, ConstantExpression, CountEverProjectionExpression, CountProjectionExpression, CountStarProjectionExpression, CrontabFrequencyExpression, CrontabParameterExpression, CrontabParameterSetExpression, CrontabRangeExpression, CurrentEvaluationContextExpression, CurrentTimestampExpression, DotExpression, ExpressionPlaceholder, FirstEverProjectionExpression, GroupingExpression, GroupingIdExpression, InExpression, InstanceOfExpression, IStreamBuiltinExpression, Junction, LambdaExpression, LastEverProjectionExpression, LikeExpression, MaxProjectionExpression, MaxRowExpression, MedianProjectionExpression, MinProjectionExpression, MinRowExpression, NamedParameterExpression, NewInstanceOperatorExpression, NewOperatorExpression, NotExpression, OrderedObjectParamExpression, PlugInProjectionExpression, PreviousExpression, PriorExpression, PropertyExistsExpression, PropertyValueExpression, RegExpExpression, RelationalOpExpression, SingleRowMethodExpression, StaticMethodExpression, StddevProjectionExpression, StreamWildcardExpression, SubqueryExistsExpression, SubqueryExpression, SubqueryInExpression, SubqueryQualifiedExpression, SubstitutionParameterExpressionBase, SumProjectionExpression, TableAccessExpression, TimePeriodExpression, TypeOfExpression, WildcardExpression

public abstract class ExpressionBase
extends Object
implements Expression

Base expression.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ExpressionBase() Ctor.

Method Summary

Modifier and Type	Method and Description
void	addChild(Expression expression) Adds a new child expression to the current expression.
List<Expression>	getChildren() Returns the list of sub-expressions to the current expression.
String	getTreeObjectName() Returns the tree of object name, for use by tools to assign an identifier to an expression.
protected static void	renderAggregation(StringWriter writer, String name, boolean distinct, List<Expression> children) Render an aggregation function with distinct and parameter expressions
void	setChildren(List<Expression> children) Sets the list of sub-expressions (child expressions) to the current expression node.
void	setTreeObjectName(String treeObjectName) Sets the tree of object name, for use by tools to assign an identifier to an expression.
void	toEPL(StringWriter writer, ExpressionPrecedenceEnum parentPrecedence) Write expression considering precedence.
static void	toPrecedenceFreeEPL(List<Expression> children, StringWriter writer) Render expression list
protected static void	toPrecedenceFreeEPL(String functionName, List<Expression> children, StringWriter writer) Renders child expression of a function in a comma-separated list.
abstract void	toPrecedenceFreeEPL(StringWriter writer) Renders the expressions and all it's child expression, in full tree depth, as a string in language syntax.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.espertech.esper.client.soda.Expression

getPrecedence

Constructor Detail

ExpressionBase

public ExpressionBase()

Ctor.

Method Detail

getTreeObjectName

public String getTreeObjectName()

Description copied from interface: Expression

Returns the tree of object name, for use by tools to assign an identifier to an expression.

Specified by:

getTreeObjectName in interface Expression

Returns:

tree object id

setTreeObjectName

public void setTreeObjectName(String treeObjectName)

Description copied from interface: Expression

Sets the tree of object name, for use by tools to assign an identifier to an expression.

Specified by:

setTreeObjectName in interface Expression

Parameters:

treeObjectName - tree object id

getChildren

public List<Expression> getChildren()

Returns the list of sub-expressions to the current expression.

Specified by:

getChildren in interface Expression

Returns:

list of child expressions

addChild

public void addChild(Expression expression)

Adds a new child expression to the current expression.

Parameters:

expression - to add

setChildren

public void setChildren(List<Expression> children)

Description copied from interface: Expression

Sets the list of sub-expressions (child expressions) to the current expression node.

Specified by:

setChildren in interface Expression

Parameters:

children - child expressions or empty list if there are no child expressions

toEPL

public final void toEPL(StringWriter writer,
                        ExpressionPrecedenceEnum parentPrecedence)

Description copied from interface: Expression

Write expression considering precedence.

Specified by:

toEPL in interface Expression

Parameters:

writer - to use

parentPrecedence - precedence

toPrecedenceFreeEPL

protected static void toPrecedenceFreeEPL(String functionName,
                                          List<Expression> children,
                                          StringWriter writer)

Renders child expression of a function in a comma-separated list.

Parameters:

functionName - function name

children - child nodes

writer - writer

toPrecedenceFreeEPL

public static void toPrecedenceFreeEPL(List<Expression> children,
                                       StringWriter writer)

Render expression list

Parameters:

children - expressions to render

writer - writer to render to

renderAggregation

protected static void renderAggregation(StringWriter writer,
                                        String name,
                                        boolean distinct,
                                        List<Expression> children)

Render an aggregation function with distinct and parameter expressions

Parameters:

writer - to render to

name - function name

distinct - distinct flag

children - parameters to render

toPrecedenceFreeEPL

public abstract void toPrecedenceFreeEPL(StringWriter writer)

Renders the expressions and all it's child expression, in full tree depth, as a string in language syntax.

Parameters:

writer - is the output to use