Source Code Cross Referenced for Element.java in  » Report » datavision-1.1.0 » jimm » datavision » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Report » datavision 1.1.0 » jimm.datavision 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package jimm.datavision;
002:
003:        import jimm.util.XMLWriter;
004:        import java.util.Observer;
005:        import java.util.Observable;
006:
007:        /**
008:         * <code>Element</code> is the abstract superclass of <code>Field</code>
009:         * and <code>Line</code>. These are the visual elements of a report section.
010:         *
011:         * @author Jim Menard, <a href="mailto:jimm@io.com">jimm@io.com</a>
012:         */
013:
014:        public abstract class Element extends Observable implements  Writeable,
015:                Observer {
016:
017:            protected Report report;
018:            protected Section section;
019:            protected boolean visible;
020:
021:            /**
022:             * Constructor. (Though a section knows about it's report, too, often we
023:             * create elements with a <code>null</code> section and then add them to
024:             * some section later on).
025:             *
026:             * @param report the report containing this element
027:             * @param section the report section containing this element
028:             */
029:            public Element(Report report, Section section, boolean visible) {
030:                this .report = report;
031:                this .section = section;
032:                this .visible = visible;
033:            }
034:
035:            public void update(Observable o, Object arg) {
036:                setChanged();
037:                notifyObservers(arg);
038:            }
039:
040:            /**
041:             * Returns the section that containts this field.
042:             *
043:             * @return the section
044:             */
045:            public Section getSection() {
046:                return section;
047:            }
048:
049:            /**
050:             * Returns the report that containts this field.
051:             *
052:             * @return the report
053:             */
054:            public Report getReport() {
055:                return report;
056:            }
057:
058:            /**
059:             * Modifies the section to which this field belongs. Only called by
060:             * section itself.
061:             *
062:             * @param s the section
063:             */
064:            public void setSection(Section s) {
065:                if (s != section) {
066:                    section = s;
067:                    setChanged();
068:                    notifyObservers();
069:                }
070:            }
071:
072:            /**
073:             * Returns the visible state of this element.
074:             *
075:             * @return the visible state
076:             */
077:            public boolean isVisible() {
078:                return visible;
079:            }
080:
081:            /**
082:             * Sets the visibility of this element.
083:             *
084:             * @param newVisible the new visible state
085:             */
086:            public void setVisible(boolean newVisible) {
087:                if (visible != newVisible) {
088:                    visible = newVisible;
089:                    setChanged();
090:                    notifyObservers();
091:                }
092:            }
093:
094:            /**
095:             * Writes this element as an XML tag. This abstract method is overridden
096:             * by the <code>Field</code> and <code>Line</code> subclasses.
097:             *
098:             * @param out a writer that knows how to write XML
099:             */
100:            public abstract void writeXML(XMLWriter out);
101:
102:        }
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