dods.dap.Server
Class DereferenceClause

java.lang.Object
  dods.dap.Server.AbstractClause
      dods.dap.Server.DereferenceClause

All Implemented Interfaces:

Clause, SubClause

public class DereferenceClause
extends AbstractClause
implements SubClause

Represents a sub-clause that is a URL reference to remote data. This feature is not yet supported in Java. Thus this class throws an exception in its constructor.

Author:

joew

See Also:

ClauseFactory

Field Summary

protected Clause	parent
protected String	url
protected dods.dap.BaseType	value

Fields inherited from class dods.dap.Server.AbstractClause

children, constant, defined

Constructor Summary

protected

DereferenceClause(String url) Creates a new DereferenceClause

Method Summary

dods.dap.BaseType	evaluate() Evaluates the clause, first calling evaluate() on any sub-clauses it contains.
Clause	getParent() Returns the Clause which contains this subclause.
String	getURL()
dods.dap.BaseType	getValue() Returns a BaseType containing the current value of the sub-clause.
protected dods.dap.BaseType	retrieve(String url)
void	setParent(Clause parent) Sets the parent of this subclause.
String	toString()

Methods inherited from class dods.dap.Server.AbstractClause

getChildren, isConstant, isDefined

Methods inherited from class java.lang.Object

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

Methods inherited from interface dods.dap.Server.Clause

getChildren, isConstant, isDefined

Field Detail

url

protected String url

parent

protected Clause parent

value

protected dods.dap.BaseType value

Constructor Detail

DereferenceClause

protected DereferenceClause(String url)
                     throws SDODSException

Creates a new DereferenceClause

Throws:

SDODSException

Method Detail

getValue

public dods.dap.BaseType getValue()

Description copied from interface: SubClause

Returns a BaseType containing the current value of the sub-clause. Sub-clauses that are not constant have an undefined value until the evaluate() method has been called. However, in such circumstances this method is still useful, as it indicates which class of BaseType the sub-clause will evaluate to. Implementations of this method should never return null.

Specified by:

getValue in interface SubClause

evaluate

public dods.dap.BaseType evaluate()

Description copied from interface: SubClause

Evaluates the clause, first calling evaluate() on any sub-clauses it contains. Implementations of this method should flag the clause as "defined" if the evaluation is successful.

Specified by:

evaluate in interface SubClause

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

getURL

public String getURL()

retrieve

protected dods.dap.BaseType retrieve(String url)
                              throws SDODSException

Throws:

SDODSException

toString

public String toString()

Overrides:

toString in class Object