com.akiban.sql.parser
Class TernaryOperatorNode

java.lang.Object
  com.akiban.sql.parser.QueryTreeNode
      com.akiban.sql.parser.ValueNode
          com.akiban.sql.parser.TernaryOperatorNode

All Implemented Interfaces:

Visitable

Direct Known Subclasses:

LikeEscapeOperatorNode

public class TernaryOperatorNode
extends ValueNode

A TernaryOperatorNode represents a built-in ternary operators. This covers built-in functions like substr(). Java operators are not represented here: the JSQL language allows Java methods to be called from expressions, but not Java operators.

Nested Class Summary

static class

TernaryOperatorNode.OperatorType

Field Summary

static int	DAY_INTERVAL
static int	FRAC_SECOND_INTERVAL
static int	HOUR_INTERVAL
protected String	leftInterfaceType
protected ValueNode	leftOperand
protected String	methodName
static int	MINUTE_INTERVAL
static int	MONTH_INTERVAL
protected String	operator
protected TernaryOperatorNode.OperatorType	operatorType
static int	QUARTER_INTERVAL
protected ValueNode	receiver
protected String	receiverInterfaceType
protected String	resultInterfaceType
protected String	rightInterfaceType
protected ValueNode	rightOperand
static int	SECOND_INTERVAL
static int	WEEK_INTERVAL
static int	YEAR_INTERVAL

Fields inherited from class com.akiban.sql.parser.QueryTreeNode

AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX

Constructor Summary

TernaryOperatorNode()

Method Summary

void	copyFrom(QueryTreeNode node) Fill this node with a deep copy of the given node.
ValueNode	getLeftOperand() Get the leftOperand
String	getMethodName()
String	getOperator()
ValueNode	getReceiver()
ValueNode	getRightOperand() Get the rightOperand
void	init(Object receiver, Object leftOperand, Object rightOperand, Object operatorType, Object trimType) Initializer for a TernaryOperatorNode
protected boolean	isEquivalent(ValueNode o) Tests if this node is equivalent to the specified ValueNode.
void	printSubNodes(int depth) Prints the sub-nodes of this object.
void	setLeftOperand(ValueNode newLeftOperand) Set the leftOperand to the specified ValueNode
void	setReceiver(ValueNode receiver)
void	setRightOperand(ValueNode newRightOperand) Set the rightOperand to the specified ValueNode
String	toString() Convert this object to a String.

Methods inherited from class com.akiban.sql.parser.ValueNode

getColumnName, getSchemaName, getSourceResultColumn, getTableName, getType, getTypeId, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isConstantExpression, isInListProbeNode, isParameterNode, isRelationalOperator, isSameNodeType, setNullability, setType

Methods inherited from class com.akiban.sql.parser.QueryTreeNode

accept, convertDefaultNode, debugFlush, debugPrint, formatNodeString, getBeginOffset, getDebugOutput, getEndOffset, getNodeFactory, getNodeType, getNullNode, getParserContext, getStatementType, getUserData, init, init, init, init, init, init, init, init, init, init, init, init, init, isInstanceOf, makeTableName, makeTableName, nodeHeader, printLabel, setBeginOffset, setDebugOutput, setEndOffset, setNodeType, setParserContext, setUserData, stackPrint, treePrint, treePrint, treePrint

Methods inherited from class java.lang.Object

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

Field Detail

operator

protected String operator

methodName

protected String methodName

operatorType

protected TernaryOperatorNode.OperatorType operatorType

receiver

protected ValueNode receiver

leftOperand

protected ValueNode leftOperand

rightOperand

protected ValueNode rightOperand

resultInterfaceType

protected String resultInterfaceType

receiverInterfaceType

protected String receiverInterfaceType

leftInterfaceType

protected String leftInterfaceType

rightInterfaceType

protected String rightInterfaceType

YEAR_INTERVAL

public static final int YEAR_INTERVAL

See Also:

Constant Field Values

QUARTER_INTERVAL

public static final int QUARTER_INTERVAL

See Also:

Constant Field Values

MONTH_INTERVAL

public static final int MONTH_INTERVAL

See Also:

Constant Field Values

WEEK_INTERVAL

public static final int WEEK_INTERVAL

See Also:

Constant Field Values

DAY_INTERVAL

public static final int DAY_INTERVAL

See Also:

Constant Field Values

HOUR_INTERVAL

public static final int HOUR_INTERVAL

See Also:

Constant Field Values

MINUTE_INTERVAL

public static final int MINUTE_INTERVAL

See Also:

Constant Field Values

SECOND_INTERVAL

public static final int SECOND_INTERVAL

See Also:

Constant Field Values

FRAC_SECOND_INTERVAL

public static final int FRAC_SECOND_INTERVAL

See Also:

Constant Field Values

Constructor Detail

TernaryOperatorNode

public TernaryOperatorNode()

Method Detail

init

public void init(Object receiver,
                 Object leftOperand,
                 Object rightOperand,
                 Object operatorType,
                 Object trimType)

Initializer for a TernaryOperatorNode

Overrides:

init in class ValueNode

Parameters:

receiver - The receiver (eg, string being operated on in substr())

leftOperand - The left operand of the node

rightOperand - The right operand of the node

operatorType - The type of the operand

trimType - The maximum width of this new node

copyFrom

public void copyFrom(QueryTreeNode node)
              throws StandardException

Fill this node with a deep copy of the given node.

Overrides:

copyFrom in class ValueNode

Throws:

StandardException

toString

public String toString()

Convert this object to a String. See comments in QueryTreeNode.java for how this should be done for tree printing.

Overrides:

toString in class ValueNode

Returns:

This object as a String

printSubNodes

public void printSubNodes(int depth)

Prints the sub-nodes of this object. See QueryTreeNode.java for how tree printing is supposed to work.

Overrides:

printSubNodes in class QueryTreeNode

Parameters:

depth - The depth of this node in the tree

getOperator

public String getOperator()

getMethodName

public String getMethodName()

getReceiver

public ValueNode getReceiver()

setReceiver

public void setReceiver(ValueNode receiver)

setLeftOperand

public void setLeftOperand(ValueNode newLeftOperand)

Set the leftOperand to the specified ValueNode

Parameters:

newLeftOperand - The new leftOperand

getLeftOperand

public ValueNode getLeftOperand()

Get the leftOperand

Returns:

The current leftOperand.

setRightOperand

public void setRightOperand(ValueNode newRightOperand)

Set the rightOperand to the specified ValueNode

Parameters:

newRightOperand - The new rightOperand

getRightOperand

public ValueNode getRightOperand()

Get the rightOperand

Returns:

The current rightOperand.

isEquivalent

protected boolean isEquivalent(ValueNode o)
                        throws StandardException

Description copied from class: ValueNode

Tests if this node is equivalent to the specified ValueNode. Two ValueNodes are considered equivalent if they will evaluate to the same value during query execution.

This method provides basic expression matching facility for the derived class of ValueNode and it is used by the language layer to compare the node structural form of the two expressions for equivalence at bind phase.

Note that it is not comparing the actual row values at runtime to produce a result; hence, when comparing SQL NULLs, they are considered to be equivalent and not unknown.

One usage case of this method in this context is to compare the select column expression against the group by expression to check if they are equivalent. e.g.:

SELECT c1+c2 FROM t1 GROUP BY c1+c2

In general, node equivalence is determined by the derived class of ValueNode. But they generally abide to the rules below:

• The two ValueNodes must be of the same node type to be considered equivalent. e.g.: CastNode vs. CastNode - equivalent (if their args also match), ColumnReference vs CastNode - not equivalent.
• If node P contains other ValueNode(s) and so on, those node(s) must also be of the same node type to be considered equivalent.
• If node P takes a parameter list, then the number of arguments and its arguments for the two nodes must also match to be considered equivalent. e.g.: CAST(c1 as INTEGER) vs CAST(c1 as SMALLINT), they are not equivalent.
• When comparing SQL NULLs in this context, they are considered to be equivalent.
• If this does not apply or it is determined that the two nodes are not equivalent then the derived class of this method should return false; otherwise, return true.

Specified by:

isEquivalent in class ValueNode

Parameters:

o - the node to compare this ValueNode against.

Returns:

true if the two nodes are equivalent, false otherwise.

Throws:

StandardException