com.espertech.esper.client.soda
Class AccessProjectionExpressionBase

java.lang.Object
  extended by com.espertech.esper.client.soda.ExpressionBase
      extended by com.espertech.esper.client.soda.AccessProjectionExpressionBase
All Implemented Interfaces:
Expression, java.io.Serializable
Direct Known Subclasses:
FirstProjectionExpression, LastProjectionExpression, WindowProjectionExpression

public abstract class AccessProjectionExpressionBase
extends ExpressionBase

Represents the base expression for "first", "last" and "window" aggregation functions.

See Also:
Serialized Form

Constructor Summary
AccessProjectionExpressionBase()
          Ctor.
AccessProjectionExpressionBase(Expression expression)
          Ctor.
 
Method Summary
abstract  java.lang.String getAggregationFunctionName()
          Returns the function name of the aggregation function.
 ExpressionPrecedenceEnum getPrecedence()
          Returns precendence.
 java.lang.String getStreamWildcard()
          Return stream name for stream-wild, if any.
 boolean isWildcard()
          Returns true for wildcard parameter.
 void setStreamWildcard(java.lang.String streamWildcard)
          Set stream name for stream-wild, if any.
 void setWildcard(boolean wildcard)
          Set to true for wildcard parameter.
 void toPrecedenceFreeEPL(java.io.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 com.espertech.esper.client.soda.ExpressionBase
addChild, getChildren, getTreeObjectName, setChildren, setTreeObjectName, toEPL
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

AccessProjectionExpressionBase

public AccessProjectionExpressionBase()
Ctor.


AccessProjectionExpressionBase

public AccessProjectionExpressionBase(Expression expression)
Ctor.

Parameters:
expression - to aggregate
Method Detail

getAggregationFunctionName

public abstract java.lang.String getAggregationFunctionName()
Returns the function name of the aggregation function.

Returns:
function name

getPrecedence

public ExpressionPrecedenceEnum getPrecedence()
Description copied from interface: Expression
Returns precendence.

Returns:
precendence

isWildcard

public boolean isWildcard()
Returns true for wildcard parameter.

Returns:
wildcard indicator

setWildcard

public void setWildcard(boolean wildcard)
Set to true for wildcard parameter.

Parameters:
wildcard - wildcard indicator

getStreamWildcard

public java.lang.String getStreamWildcard()
Return stream name for stream-wild, if any.

Returns:
stream wildcard

setStreamWildcard

public void setStreamWildcard(java.lang.String streamWildcard)
Set stream name for stream-wild, if any.

Parameters:
streamWildcard - stream wildcard

toPrecedenceFreeEPL

public void toPrecedenceFreeEPL(java.io.StringWriter writer)
Description copied from class: ExpressionBase
Renders the expressions and all it's child expression, in full tree depth, as a string in language syntax.

Specified by:
toPrecedenceFreeEPL in class ExpressionBase
Parameters:
writer - is the output to use

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