edu.cmu.aura.service.query
Class LeafNode

java.lang.Object
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  +--edu.cmu.aura.service.query.ExpressionNode
        |
        +--edu.cmu.aura.service.query.LeafNode

public class LeafNode

extends ExpressionNode

A leaf node in an expression tree applies a comparison operator to an attribute and a literal value.

Field Summary

static java.lang.String[]	alternateOpNames
static int	MAX_OP_INDEX
static int	OP_CUSTOM
static int	OP_EQ
static int	OP_GT
static int	OP_GTEQ
static int	OP_LT
static int	OP_LTEQ
static int	OP_NEQ
static int	OP_UNKNOWN_OR_CUSTOM
static java.lang.String[]	opNames

Constructor Summary

LeafNode(int operator, java.lang.String attribName, java.lang.Object literal)
Creates a LeafNode

LeafNode(int operator, java.lang.String opName, java.lang.String attribName, java.lang.Object literal)
Creates a LeafNode with a custom operator

Method Summary

java.lang.String	getAlternateOperatorName() Return the altername name of the operator at this LeafNode.
java.lang.String	getAttrib2Name()
java.lang.String	getAttribName() Return the name of the attribute at this LeafNode.
static int	getLeafOperator(java.lang.String leafOpName) Gets an operator given its name.
java.lang.Object	getLiteral() Return the literal at this LeafNode.
java.lang.String	getOperatorName() Return the name of the operator at this LeafNode.
void	setAttrib2Name(java.lang.String attrib2Name)
void	setAttribName(java.lang.String attribName) Set the name of the attribute at this LeafNode.
void	setCustomOperator(java.lang.String opName) Set this node's operator
void	setLiteral(java.lang.Object literal) Set the literal at this LeafNode.
void	setOperator(int operator) Set this node's operator

Methods inherited from class edu.cmu.aura.service.query.ExpressionNode

getOperator, isLeafNode

Methods inherited from class java.lang.Object

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

Field Detail

OP_EQ

public static final int OP_EQ

See Also:

Constant Field Values

OP_NEQ

public static final int OP_NEQ

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Constant Field Values

OP_GT

public static final int OP_GT

See Also:

Constant Field Values

OP_GTEQ

public static final int OP_GTEQ

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Constant Field Values

OP_LT

public static final int OP_LT

See Also:

Constant Field Values

OP_LTEQ

public static final int OP_LTEQ

See Also:

Constant Field Values

MAX_OP_INDEX

public static final int MAX_OP_INDEX

See Also:

Constant Field Values

OP_CUSTOM

public static final int OP_CUSTOM

See Also:

Constant Field Values

OP_UNKNOWN_OR_CUSTOM

public static final int OP_UNKNOWN_OR_CUSTOM

See Also:

Constant Field Values

opNames

public static final java.lang.String[] opNames

alternateOpNames

public static final java.lang.String[] alternateOpNames

Constructor Detail

LeafNode

public LeafNode(int operator,
                java.lang.String attribName,
                java.lang.Object literal)

Creates a LeafNode

Parameters:

operator - the operator of this LeafNode.

LeafNode

public LeafNode(int operator,
                java.lang.String opName,
                java.lang.String attribName,
                java.lang.Object literal)

Creates a LeafNode with a custom operator

Parameters:

operator - the operator of this LeafNode.

Method Detail

getLeafOperator

public static int getLeafOperator(java.lang.String leafOpName)

Gets an operator given its name.

Parameters:

leafOpName - name of the operator to retrieve

Returns:

operator for the given leafOpName or OP_UNKNOWN_OR_CUSTOM if the not known (which could either be because it is an invalid operator name or because it is a custom operator).

getOperatorName

public java.lang.String getOperatorName()

Return the name of the operator at this LeafNode.

Specified by:

getOperatorName in class ExpressionNode

Returns:

the name of this operator at this LeafNode

getAlternateOperatorName

public java.lang.String getAlternateOperatorName()

Return the altername name of the operator at this LeafNode.

Returns:

the altername name of this operator at this LeafNode

setOperator

public void setOperator(int operator)

Set this node's operator

Specified by:

setOperator in class ExpressionNode

Parameters:

operator - this node's operator

setCustomOperator

public void setCustomOperator(java.lang.String opName)

Set this node's operator

getAttribName

public java.lang.String getAttribName()

Return the name of the attribute at this LeafNode.

Returns:

the name of this attribute at this LeafNode

setAttribName

public void setAttribName(java.lang.String attribName)

Set the name of the attribute at this LeafNode.

Parameters:

attribName - the name of the attribute at this LeafNode

getAttrib2Name

public java.lang.String getAttrib2Name()

setAttrib2Name

public void setAttrib2Name(java.lang.String attrib2Name)

getLiteral

public java.lang.Object getLiteral()

Return the literal at this LeafNode.

Returns:

the literal at this LeafNode.

setLiteral

public void setLiteral(java.lang.Object literal)

Set the literal at this LeafNode.

Parameters:

literal - the literal at this LeafNode