jimm.datavision
Class Element

java.lang.Object
  java.util.Observable
      jimm.datavision.Element

All Implemented Interfaces:

java.util.Observer, Writeable

Direct Known Subclasses:

Field, Line

public abstract class Element
extends java.util.Observable
implements Writeable, java.util.Observer

Element is the abstract superclass of Field and Line. These are the visual elements of a report section.

Author:

Jim Menard, jimm@io.com

Field Summary

protected Report	report
protected Section	section
protected boolean	visible

Constructor Summary

Element(Report report, Section section, boolean visible)
Constructor.

Method Summary

Report	getReport() Returns the report that containts this field.
Section	getSection() Returns the section that containts this field.
boolean	isVisible() Returns the visible state of this element.
void	setSection(Section s) Modifies the section to which this field belongs.
void	setVisible(boolean newVisible) Sets the visibility of this element.
void	update(java.util.Observable o, java.lang.Object arg)
abstract void	writeXML(XMLWriter out) Writes this element as an XML tag.

Methods inherited from class java.util.Observable

addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged

Methods inherited from class java.lang.Object

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

Field Detail

report

protected Report report

section

protected Section section

visible

protected boolean visible

Constructor Detail

Element

public Element(Report report,
               Section section,
               boolean visible)

Constructor. (Though a section knows about it's report, too, often we create elements with a null section and then add them to some section later on).

Parameters:

report - the report containing this element

section - the report section containing this element

Method Detail

update

public void update(java.util.Observable o,
                   java.lang.Object arg)

Specified by:

update in interface java.util.Observer

getSection

public Section getSection()

Returns the section that containts this field.

Returns:

the section

getReport

public Report getReport()

Returns the report that containts this field.

Returns:

the report

setSection

public void setSection(Section s)

Modifies the section to which this field belongs. Only called by section itself.

Parameters:

s - the section

isVisible

public boolean isVisible()

Returns the visible state of this element.

Returns:

the visible state

setVisible

public void setVisible(boolean newVisible)

Sets the visibility of this element.

Parameters:

newVisible - the new visible state

writeXML

public abstract void writeXML(XMLWriter out)

Writes this element as an XML tag. This abstract method is overridden by the Field and Line subclasses.

Specified by:

writeXML in interface Writeable

Parameters:

out - a writer that knows how to write XML