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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.impl.sql.compile

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Java Document (Java Doc)

java.lang .Object

org.apache.derby.impl.sql.compile .MaxMinAggregateDefinition

MaxMinAggregateDefinition
public class MaxMinAggregateDefinition implements AggregateDefinition(Code)
	Defintion for the MAX()/MIN() aggregates. author: jamie

Constructor Summary
public	MaxMinAggregateDefinition() Niladic constructor.

Method Summary
final public TypeDescriptor	getAggregator(TypeDescriptor inputType, StringBuffer aggregatorClass) Determines the result datatype.
final public boolean	isMax() Return if the aggregator class is for min/max.
final public void	setMaxOrMin(boolean isMax) This is set by the parser.

Constructor Detail

MaxMinAggregateDefinition
public MaxMinAggregateDefinition()(Code)
	Niladic constructor. Does nothing. For ease Of use, only.

Method Detail

getAggregator
final public TypeDescriptor getAggregator(TypeDescriptor inputType, StringBuffer aggregatorClass)(Code)
	Determines the result datatype. Accept NumberDataValues only. Note: In the future you should be able to do a sum user data types. One option would be to run sum on anything that implements divide(). Parameters: inputType - the input type, either a user type or a java.lang object the output Class (null if cannot operate onvalue expression of this type.

isMax
final public boolean isMax()(Code)
	Return if the aggregator class is for min/max. boolean true/false

setMaxOrMin
final public void setMaxOrMin(boolean isMax)(Code)
	This is set by the parser.

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
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final public void wait() throws InterruptedException(Code)(Java Doc)

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