Package org.apache.velocity.runtime.parser.node

Class ASTComparisonNode

java.lang.Object

org.apache.velocity.runtime.parser.node.SimpleNode

org.apache.velocity.runtime.parser.node.ASTBinaryOperator

org.apache.velocity.runtime.parser.node.ASTComparisonNode

All Implemented Interfaces:

Cloneable, Node, Renderable

Direct Known Subclasses:

ASTEQNode, ASTGENode, ASTGTNode, ASTLENode, ASTLTNode

public abstract class ASTComparisonNode
extends ASTBinaryOperator

Numeric comparison support

Author:

Will Glass-Husain, Peter Romianowski, Nathan Bubna

Field Summary

Fields inherited from class org.apache.velocity.runtime.parser.node.SimpleNode

children, column, first, firstImage, id, info, invalid, last, lastImage, line, literal, log, parent, parser, rsvc, state, template

Constructor Summary

Constructors

Constructor	Description
ASTComparisonNode(int id)
ASTComparisonNode(Parser p, int id)

Method Summary

Modifier and Type	Method	Description
boolean	compareNonNumber(Object left, Object right)
boolean	compareNull(Object left, Object right)	Always false by default, != and == subclasses must override this.
Boolean	compareNumbers(Object left, Object right)	compare numbers
boolean	evaluate(InternalContextAdapter context)
abstract String	getLiteralOperator()	get the string representing the mathematical operator
Object	jjtAccept(StandardParserVisitor visitor, Object data)
abstract boolean	numberTest(int compareResult)	performs the actual comparison
Object	value(InternalContextAdapter context)

Methods inherited from class org.apache.velocity.runtime.parser.node.ASTBinaryOperator

init, literal

Methods inherited from class org.apache.velocity.runtime.parser.node.SimpleNode

childrenAccept, cleanupParserAndTokens, clone, clone, dump, dump, dump, execute, getColumn, getFirstToken, getFirstTokenImage, getInfo, getLastToken, getLastTokenImage, getLine, getLocation, getParser, getRuntimeServices, getTemplate, getTemplateName, getType, isInvalid, jjtAddChild, jjtClose, jjtGetChild, jjtGetNumChildren, jjtGetParent, jjtOpen, jjtSetParent, render, saveTokenImages, setFirstToken, setInfo, setInvalid, toString, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ASTComparisonNode

public ASTComparisonNode(int id)

Parameters:

id -

ASTComparisonNode

public ASTComparisonNode(Parser p,
                         int id)

Parameters:

p -

id -

Method Detail

jjtAccept

public Object jjtAccept(StandardParserVisitor visitor,
                        Object data)

Specified by:

jjtAccept in interface Node

Overrides:

jjtAccept in class SimpleNode

Returns:

The Node execution result object.

See Also:

SimpleNode.jjtAccept(org.apache.velocity.runtime.parser.node.StandardParserVisitor, java.lang.Object)

evaluate

public boolean evaluate(InternalContextAdapter context)
                 throws MethodInvocationException

Specified by:

evaluate in interface Node

Overrides:

evaluate in class SimpleNode

Returns:

The evaluation result.

Throws:

MethodInvocationException

See Also:

SimpleNode.evaluate(org.apache.velocity.context.InternalContextAdapter)

compareNull

public boolean compareNull(Object left,
                           Object right)

Always false by default, != and == subclasses must override this.

Parameters:

left -

right -

Returns:

comparison result

compareNumbers

public Boolean compareNumbers(Object left,
                              Object right)

compare numbers

Parameters:

left -

right -

Returns:

comparison result

getLiteralOperator

public abstract String getLiteralOperator()

get the string representing the mathematical operator

Specified by:

getLiteralOperator in class ASTBinaryOperator

Returns:

operator string

numberTest

public abstract boolean numberTest(int compareResult)

performs the actual comparison

Parameters:

compareResult -

Returns:

comparison result

compareNonNumber

public boolean compareNonNumber(Object left,
                                Object right)

value

public Object value(InternalContextAdapter context)
             throws MethodInvocationException

Specified by:

value in interface Node

Overrides:

value in class SimpleNode

Returns:

The node value.

Throws:

MethodInvocationException

See Also:

SimpleNode.value(org.apache.velocity.context.InternalContextAdapter)