opendap.servers

Class ValueClause

java.lang.Object

opendap.servers.AbstractClause

opendap.servers.ValueClause

All Implemented Interfaces:

Clause, SubClause

public class ValueClause
extends AbstractClause
implements SubClause

Represents a clause containing a simple value. If the value is an constant value such as "2.0", the clause's isConstant() method will return true; if it is a variable of the dataset, isConstant() will return false.

See Also:

ClauseFactory

Field Summary

Fields

Modifier and Type	Field and Description
protected Clause	parent
protected BaseType	value

Fields inherited from class opendap.servers.AbstractClause

children, constant, defined

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ValueClause(BaseType value, boolean constant) Creates a new ValueClause.

Method Summary

Modifier and Type	Method and Description
BaseType	evaluate() Returns the BaseType represented by this clause.
Clause	getParent() Returns the Clause which contains this subclause.
BaseType	getValue() Returns the BaseType represented by this clause.
void	printConstraint(java.io.PrintWriter os) Prints the original string representation of this clause.
void	setParent(Clause parent) Sets the parent of this subclause.

Methods inherited from class opendap.servers.AbstractClause

getChildren, isConstant, isDefined

Methods inherited from class java.lang.Object

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

Methods inherited from interface opendap.servers.Clause

getChildren, isConstant, isDefined

Field Detail

value

protected BaseType value

parent

protected Clause parent

Constructor Detail

ValueClause

protected ValueClause(BaseType value,
                      boolean constant)

Creates a new ValueClause.

Parameters:

value - The BaseType represented by this clause. This can be either a BaseType taken from the DDS of a dataset, or a BaseType object created to hold a constant value.

constant - Should be set to false if the value parameter is from the DDS of a dataset, and true if the value parameter is a constant value.

Method Detail

getValue

public BaseType getValue()

Returns the BaseType represented by this clause.

Specified by:

getValue in interface SubClause

evaluate

public BaseType evaluate()

Returns the BaseType represented by this clause. Equivalent to getValue(), except that calling this method flags this clause as "defined".

Specified by:

evaluate in interface SubClause

Throws:

DAP2ServerSideException - Not thrown by this type of clause.

getParent

public Clause getParent()

Description copied from interface: SubClause

Returns the Clause which contains this subclause. The clause returned may be a TopLevelClause or another SubClause.

Specified by:

getParent in interface SubClause

setParent

public void setParent(Clause parent)

Description copied from interface: SubClause

Sets the parent of this subclause. Used during parsing.

Specified by:

setParent in interface SubClause

printConstraint

public void printConstraint(java.io.PrintWriter os)

Prints the original string representation of this clause. For use in debugging.

Specified by:

printConstraint in interface Clause