/* java.beans.PropertyEditorSupport
- Copyright (C) 1998 Free Software Foundation, Inc.
+ Copyright (C) 1998, 2004 Free Software Foundation, Inc.
This file is part of GNU Classpath.
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
-
+
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
package java.beans;
+
/**
- ** PropertyEditorSupport helps with PropertyEditors,
- ** implementing base functionality that they usually must
- ** have but which is a pain to implement. You may extend
- ** from this class or use it as a standalone.<P>
- **
- ** This class does not do any painting or actual editing.
- ** For that, you must use or extend it. See the
- ** PropertyEditor class for better descriptions of what
- ** the various methods do.
- **
- ** @author John Keiser
- ** @since JDK1.1
- ** @version 1.1.0, 29 Jul 1998
- **/
-
-public class PropertyEditorSupport implements PropertyEditor {
- Object eventSource;
- Object val;
- PropertyChangeSupport pSupport;
-
- /** Call this constructor when you are deriving from
- ** PropertyEditorSupport.
- **/
- protected PropertyEditorSupport() {
- this.eventSource = this;
- this.pSupport = new PropertyChangeSupport(this);
- }
-
- /** Call this constructor when you are using
- ** PropertyEditorSupport as a helper object.
- ** @param eventSource the source to use when firing
- ** property change events.
- **/
- protected PropertyEditorSupport(Object eventSource) {
- this.eventSource = eventSource;
- this.pSupport = new PropertyChangeSupport(this);
- }
-
- /** Set the current value of the property.
- ** <STRONG>Implementation Note</STRONG> Sun does not
- ** state what exactly this version of the method does.
- ** Thus, in this implementation, it sets the value, and
- ** then if the old and new values are different, it
- ** fires a property change event with no property name
- ** and the old and new values.
- ** @param val the new value for the property.
- **/
- public void setValue(Object val) {
- Object oldVal = val;
- this.val = val;
- if(!oldVal.equals(val)) {
- pSupport.firePropertyChange(null,oldVal,val);
- }
- }
-
- /** Get the current value of the property.
- ** @return the current value of the property.
- **/
- public Object getValue() {
- return val;
- }
-
- /** Get whether this object is paintable or not.
- ** @return <CODE>false</CODE>
- **/
- public boolean isPaintable() {
- return false;
- }
-
- /** Paint this object. This class does nothing in
- ** this method.
- **/
- public void paintValue(java.awt.Graphics g, java.awt.Rectangle r) {
- }
-
- /** Get the Java initialization String for the current
- ** value of the Object. This class returns gibberish or
- ** null (though the spec does not say which).<P>
- ** <STRONG>Implementation Note:</STRONG> This class
- ** returns the string "@$#^" to make sure the code will
- ** be broken, so that you will know to override it when
- ** you create your own property editor.
- ** @return the Java initialization string.
- **/
- public String getJavaInitializationString() {
- return "@$#^";
- }
-
- /** Get the value as text.
- ** In this class, you cannot count on getAsText() doing
- ** anything useful, although in this implementation I
- ** do toString().
- ** @return the value as text.
- **/
- public String getAsText() {
- return val != null ? val.toString() : "null";
- }
-
- /** Set the value as text.
- ** In this class, you cannot count on setAsText() doing
- ** anything useful across implementations.
- ** <STRONG>Implementation Note:</STRONG> In this
- ** implementation it checks if the String is "null", and
- ** if it is, sets the value to null, otherwise it throws
- ** an IllegalArgumentException.
- ** @param s the text to convert to a new value.
- ** @exception IllegalArgumentException if the text is
- ** malformed.
- **/
- public void setAsText(String s) throws IllegalArgumentException {
- if(s.equals("null")) {
- setValue(null);
- } else {
- throw new IllegalArgumentException();
- }
- }
-
- /** Returns a list of possible choices for the value.
- ** @return <CODE>null</CODE>
- **/
- public String[] getTags() {
- return null;
- }
-
- /** Return a custom component to edit the value.
- ** @return <CODE>null</CODE> in this class.
- **/
- public java.awt.Component getCustomEditor() {
- return null;
- }
-
- /** Find out whether this property editor supports a
- ** custom component to edit its value.
- ** @return <CODE>false</CODE> in this class.
- **/
- public boolean supportsCustomEditor() {
- return false;
- }
-
- /** Add a property change listener to this property editor.
- ** @param l the listener to add.
- **/
- public void addPropertyChangeListener(PropertyChangeListener l) {
- pSupport.addPropertyChangeListener(l);
- }
-
- /** Remove a property change listener from this property editor.
- ** @param l the listener to remove.
- **/
- public void removePropertyChangeListener(PropertyChangeListener l) {
- pSupport.removePropertyChangeListener(l);
- }
-
-
- /** Notify people that we've changed, although we don't
- ** tell them just how. The only thing I can think of to
- ** send in the event is the new value (since the old value
- ** is unavailable and there is no property name).
- ** I confess I do not understand the point of this method.
- **/
- public void firePropertyChange() {
- pSupport.firePropertyChange(null,null,val);
- }
-}
+ * PropertyEditorSupport helps with PropertyEditors,
+ * implementing base functionality that they usually must
+ * have but which is a pain to implement. You may extend
+ * from this class or use it as a standalone.<P>
+ *
+ * This class does not do any painting or actual editing.
+ * For that, you must use or extend it. See the
+ * PropertyEditor class for better descriptions of what
+ * the various methods do.
+ *
+ * @author John Keiser
+ * @author Robert Schuster
+ * @since 1.1
+ * @status updated to 1.5
+ */
+public class PropertyEditorSupport implements PropertyEditor
+{
+ Object eventSource;
+ Object value;
+ PropertyChangeSupport pSupport;
+
+ /** Call this constructor when you are deriving from
+ * PropertyEditorSupport.
+ *
+ * Using this constructor the event source is this PropertyEditorSupport
+ * instance itself.
+ *
+ * @since 1.5
+ * @status this was <code>protected</code> prior to 1.5
+ */
+ public PropertyEditorSupport()
+ {
+ eventSource = this;
+ pSupport = new PropertyChangeSupport(this);
+ }
+
+ /** Call this constructor when you are using
+ * PropertyEditorSupport as a helper object.
+ *
+ * This constructor throws a NullPointerException when <code>source</code> is <code>null</code>,
+ * for compatibility reasons with J2SDK 1.5.0 .
+ *
+ * @param source The source to use when firing
+ * property change events.
+ * @since 1.5
+ * @status this was <code>protected</code> prior to 1.5
+ */
+ public PropertyEditorSupport(Object source)
+ {
+ // note: constructor rejects source being null for the sake of compatibility
+ // with official 1.5.0 implementation
+ if (source == null)
+ throw new NullPointerException("Event source must not be null.");
+
+ eventSource = source;
+ pSupport = new PropertyChangeSupport(eventSource);
+ }
+
+ /** Sets the current value of the property and a property change
+ * event is fired to all registered PropertyChangeListener instances.
+ *
+ * @param newValue The new value for the property.
+ */
+ public void setValue(Object newValue)
+ {
+ value = newValue;
+
+ // specification in java.beans.PropertyChangeEvent says
+ // that without a property name (first argument) the
+ // new and the old value should always be null
+ pSupport.firePropertyChange(null, null, null);
+ }
+
+ /** Gets the current value of the property.
+ *
+ * @return the current value of the property.
+ */
+ public Object getValue()
+ {
+ return value;
+ }
+
+ /** Gets whether this object is paintable or not.
+ *
+ * @return <CODE>false</CODE>
+ */
+ public boolean isPaintable()
+ {
+ return false;
+ }
+
+ /** Paints this object. This class does nothing in
+ * this method.
+ */
+ public void paintValue(java.awt.Graphics g, java.awt.Rectangle r)
+ {
+ }
+ /** Gets the Java initialization String for the current
+ * value of the Object. This class returns gibberish or
+ * null (though the spec does not say which).<P>
+ * <STRONG>Implementation Note:</STRONG> This class
+ * returns the string "@$#^" to make sure the code will
+ * be broken, so that you will know to override it when
+ * you create your own property editor.
+ *
+ * @return the Java initialization string.
+ */
+ public String getJavaInitializationString()
+ {
+ return "@$#^";
+ }
+
+ /** Gets the value as text.
+ * In this class, you cannot count on getAsText() doing
+ * anything useful, although in this implementation I
+ * do toString().
+ *
+ * @return the value as text.
+ */
+ public String getAsText()
+ {
+ return value != null ? value.toString() : "null";
+ }
+
+ /** Sets the value as text.
+ * In this class, you cannot count on setAsText() doing
+ * anything useful across implementations.
+ * <STRONG>Implementation Note:</STRONG> In this
+ * implementation it checks if the String is "null", and
+ * if it is, sets the value to null, otherwise it throws
+ * an IllegalArgumentException.
+ *
+ * @param s the text to convert to a new value.
+ * @exception IllegalArgumentException if the text is
+ * malformed.
+ */
+ public void setAsText(String s) throws IllegalArgumentException
+ {
+ if (s.equals("null"))
+ setValue(null);
+ else
+ throw new IllegalArgumentException();
+ }
+
+ /** Returns a list of possible choices for the value.
+ *
+ * @return <CODE>null</CODE>
+ */
+ public String[] getTags()
+ {
+ return null;
+ }
+
+ /** Returns a custom component to edit the value.
+ *
+ * @return <CODE>null</CODE> in this class.
+ */
+ public java.awt.Component getCustomEditor()
+ {
+ return null;
+ }
+
+ /** Finds out whether this property editor supports a
+ * custom component to edit its value.
+ *
+ * @return <CODE>false</CODE> in this class.
+ */
+ public boolean supportsCustomEditor()
+ {
+ return false;
+ }
+
+ /** Adds a property change listener to this property editor.
+ *
+ * @param l the listener to add.
+ */
+ public void addPropertyChangeListener(PropertyChangeListener l)
+ {
+ pSupport.addPropertyChangeListener(l);
+ }
+
+ /** Removes a property change listener from this property editor.
+ *
+ * @param l the listener to remove.
+ */
+ public void removePropertyChangeListener(PropertyChangeListener l)
+ {
+ pSupport.removePropertyChangeListener(l);
+ }
+
+ /** Notifies people that we've changed, although we don't
+ * tell them just how.
+ */
+ public void firePropertyChange()
+ {
+ pSupport.firePropertyChange(null, null, null);
+ }
+
+ /** Returns the bean that is used as the source of events.
+ *
+ * @return The event source object
+ * @since 1.5
+ */
+ public Object getSource()
+ {
+ return eventSource;
+ }
+
+ /** Sets the bean that is used as the source of events
+ * when property changes occur.
+ *
+ * The event source bean is for informational purposes only
+ * and should not be changed by the <code>PropertyEditor</code>.
+ *
+ * @param source
+ * @since 1.5
+ */
+ public void setSource(Object source)
+ {
+ eventSource = source;
+ }
+}
projects / gcc.git / commitdiff