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ChangeTracker (JGoodies Binding 2.1 API)
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com.jgoodies.binding.util</FONT>
<BR>
Class ChangeTracker</H2>
<PRE>
java.lang.Object
  <IMG SRC="../../../../resources/inherit.gif" ALT="extended by ">AbstractBean
      <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../com/jgoodies/binding/beans/Model.html" title="class in com.jgoodies.binding.beans">com.jgoodies.binding.beans.Model</A>
          <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.jgoodies.binding.util.ChangeTracker</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../com/jgoodies/binding/beans/Observable.html" title="interface in com.jgoodies.binding.beans">Observable</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public final class <B>ChangeTracker</B><DT>extends <A HREF="../../../../com/jgoodies/binding/beans/Model.html" title="class in com.jgoodies.binding.beans">Model</A></DL>
</PRE>

<P>
Tracks changes in a set of bound bean properties. The tracker itself
 provides a read-only bound bean property <em>changed</em> that indicates
 whether one of the observed properties has changed. The changed state
 can be reset to <code>false</code> using <code>#reset</code>.<p>

 The tracker can observe readable bound bean properties if and only if
 the bean provides the optional support for listening on named properties
 as described in section 7.4.5 of the
 <a href="http://java.sun.com/products/javabeans/docs/spec.html">Java Bean
 Specification</a>. The bean class must provide the following pair of methods:
 <pre>
 public void addPropertyChangeListener(String name, PropertyChangeListener l);
 public void removePropertyChangeListener(String name, PropertyChangeListener l);
 </pre><p>

 <strong>Example:</strong><pre>
 ChangeTracker tracker = new ChangeTracker();
 tracker.observe(address, "street");
 tracker.observe(address, "city");
 tracker.addPropertyChangeListener(new PropertyChangeListener() {

     public void propertyChange(PropertyChangeEvent evt) {
         System.out.println("Change state: " + evt.getNewValue());
     }
 });

 // Change the first ValueModel
 System.out.println(tracker.isChanged()); // Prints "false"
 address.setStreet("Belsenplatz");        // Prints "Change state: true"
 System.out.println(tracker.isChanged()); // Prints "true"
 tracker.reset();                         // Prints "Change state: false"
 System.out.println(tracker.isChanged()); // Prints "false"
 </pre><p>

 <strong>Note:</strong> The classes <code>BeanAdapter</code> and
 <code>PresentationModel</code> already provide support for tracking changes.
 Typical binding code can use these classes and there seems to be no need
 to use the ChangeTracker.
<P>

<P>
<DL>
<DT><B>Version:</B></DT>
  <DD>$Revision: 1.7 $</DD>
<DT><B>Author:</B></DT>
  <DD>Karsten Lentzsch</DD>
<DT><B>See Also:</B><DD><A HREF="../../../../com/jgoodies/binding/value/ValueModel.html" title="interface in com.jgoodies.binding.value"><CODE>ValueModel</CODE></A></DL>
<HR>

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<CODE>static&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/jgoodies/binding/util/ChangeTracker.html#PROPERTYNAME_CHANGED">PROPERTYNAME_CHANGED</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The name of the read-only bound bean property that
 indicates whether one of the observed properties has changed.</TD>
</TR>
</TABLE>
&nbsp;
<!-- ======== CONSTRUCTOR SUMMARY ======== -->

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<TD><CODE><B><A HREF="../../../../com/jgoodies/binding/util/ChangeTracker.html#ChangeTracker()">ChangeTracker</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs a change tracker with change state set to <code>false</code>.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/jgoodies/binding/util/ChangeTracker.html#isChanged()">isChanged</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Answers whether one of the registered ValueModels has changed
 since this tracker has been reset last time.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/jgoodies/binding/util/ChangeTracker.html#observe(java.lang.Object, java.lang.String)">observe</A></B>(java.lang.Object&nbsp;bean,
        java.lang.String&nbsp;propertyName)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Observes the specified readable bound bean property in the given bean.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/jgoodies/binding/util/ChangeTracker.html#observe(com.jgoodies.binding.value.ValueModel)">observe</A></B>(<A HREF="../../../../com/jgoodies/binding/value/ValueModel.html" title="interface in com.jgoodies.binding.value">ValueModel</A>&nbsp;valueModel)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Observes value changes in the given ValueModel.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/jgoodies/binding/util/ChangeTracker.html#reset()">reset</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Resets this tracker's changed state to <code>false</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/jgoodies/binding/util/ChangeTracker.html#retractInterestFor(java.lang.Object, java.lang.String)">retractInterestFor</A></B>(java.lang.Object&nbsp;bean,
                   java.lang.String&nbsp;propertyName)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Retracts interest for the specified readable bound bean property
 in the given bean.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/jgoodies/binding/util/ChangeTracker.html#retractInterestFor(com.jgoodies.binding.value.ValueModel)">retractInterestFor</A></B>(<A HREF="../../../../com/jgoodies/binding/value/ValueModel.html" title="interface in com.jgoodies.binding.value">ValueModel</A>&nbsp;valueModel)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Retracts interest for value changes in the given ValueModel.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_com.jgoodies.binding.beans.Model"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class com.jgoodies.binding.beans.<A HREF="../../../../com/jgoodies/binding/beans/Model.html" title="class in com.jgoodies.binding.beans">Model</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../com/jgoodies/binding/beans/Model.html#createPropertyChangeSupport(java.lang.Object)">createPropertyChangeSupport</A>, <A HREF="../../../../com/jgoodies/binding/beans/Model.html#firePropertyChange(java.lang.String, java.lang.Object, java.lang.Object, boolean)">firePropertyChange</A></CODE></TD>
</TR>
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&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
</TR>
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&nbsp;<A NAME="methods_inherited_from_class_com.jgoodies.binding.beans.Observable"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from interface com.jgoodies.binding.beans.<A HREF="../../../../com/jgoodies/binding/beans/Observable.html" title="interface in com.jgoodies.binding.beans">Observable</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../com/jgoodies/binding/beans/Observable.html#addPropertyChangeListener(java.beans.PropertyChangeListener)">addPropertyChangeListener</A>, <A HREF="../../../../com/jgoodies/binding/beans/Observable.html#removePropertyChangeListener(java.beans.PropertyChangeListener)">removePropertyChangeListener</A></CODE></TD>
</TR>
</TABLE>
&nbsp;
<P>

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<B>Field Detail</B></FONT></TH>
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<A NAME="PROPERTYNAME_CHANGED"><!-- --></A><H3>
PROPERTYNAME_CHANGED</H3>
<PRE>
public static final java.lang.String <B>PROPERTYNAME_CHANGED</B></PRE>
<DL>
<DD>The name of the read-only bound bean property that
 indicates whether one of the observed properties has changed.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../com/jgoodies/binding/util/ChangeTracker.html#isChanged()"><CODE>isChanged()</CODE></A>, 
<A HREF="../../../../constant-values.html#com.jgoodies.binding.util.ChangeTracker.PROPERTYNAME_CHANGED">Constant Field Values</A></DL>
</DL>

<!-- ========= CONSTRUCTOR DETAIL ======== -->

<A NAME="constructor_detail"><!-- --></A>
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<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TH>
</TR>
</TABLE>

<A NAME="ChangeTracker()"><!-- --></A><H3>
ChangeTracker</H3>
<PRE>
public <B>ChangeTracker</B>()</PRE>
<DL>
<DD>Constructs a change tracker with change state set to <code>false</code>.
<P>
</DL>

<!-- ============ METHOD DETAIL ========== -->

<A NAME="method_detail"><!-- --></A>
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<B>Method Detail</B></FONT></TH>
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</TABLE>

<A NAME="isChanged()"><!-- --></A><H3>
isChanged</H3>
<PRE>
public boolean <B>isChanged</B>()</PRE>
<DL>
<DD>Answers whether one of the registered ValueModels has changed
 since this tracker has been reset last time.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>true if an observed property has changed since the last reset</DL>
</DD>
</DL>
<HR>

<A NAME="reset()"><!-- --></A><H3>
reset</H3>
<PRE>
public void <B>reset</B>()</PRE>
<DL>
<DD>Resets this tracker's changed state to <code>false</code>.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="observe(java.lang.Object, java.lang.String)"><!-- --></A><H3>
observe</H3>
<PRE>
public void <B>observe</B>(java.lang.Object&nbsp;bean,
                    java.lang.String&nbsp;propertyName)</PRE>
<DL>
<DD>Observes the specified readable bound bean property in the given bean.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>bean</CODE> - the bean to be observed<DD><CODE>propertyName</CODE> - the name of the readable bound bean property
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if the bean or propertyName is null
<DD><CODE><A HREF="../../../../com/jgoodies/binding/beans/PropertyNotBindableException.html" title="class in com.jgoodies.binding.beans">PropertyNotBindableException</A></CODE> - if this tracker can't add
     the PropertyChangeListener from the bean<DT><B>See Also:</B><DD><A HREF="../../../../com/jgoodies/binding/util/ChangeTracker.html#retractInterestFor(java.lang.Object, java.lang.String)"><CODE>retractInterestFor(Object, String)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="observe(com.jgoodies.binding.value.ValueModel)"><!-- --></A><H3>
observe</H3>
<PRE>
public void <B>observe</B>(<A HREF="../../../../com/jgoodies/binding/value/ValueModel.html" title="interface in com.jgoodies.binding.value">ValueModel</A>&nbsp;valueModel)</PRE>
<DL>
<DD>Observes value changes in the given ValueModel.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>valueModel</CODE> - the ValueModel to observe
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if the valueModel is null<DT><B>See Also:</B><DD><A HREF="../../../../com/jgoodies/binding/util/ChangeTracker.html#retractInterestFor(com.jgoodies.binding.value.ValueModel)"><CODE>retractInterestFor(ValueModel)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="retractInterestFor(java.lang.Object, java.lang.String)"><!-- --></A><H3>
retractInterestFor</H3>
<PRE>
public void <B>retractInterestFor</B>(java.lang.Object&nbsp;bean,
                               java.lang.String&nbsp;propertyName)</PRE>
<DL>
<DD>Retracts interest for the specified readable bound bean property
 in the given bean.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>bean</CODE> - the bean to be observed<DD><CODE>propertyName</CODE> - the name of the readable bound bean property
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if the bean or propertyName is null
<DD><CODE><A HREF="../../../../com/jgoodies/binding/beans/PropertyNotBindableException.html" title="class in com.jgoodies.binding.beans">PropertyNotBindableException</A></CODE> - if this tracker can't remove
     the PropertyChangeListener from the bean<DT><B>See Also:</B><DD><A HREF="../../../../com/jgoodies/binding/util/ChangeTracker.html#observe(java.lang.Object, java.lang.String)"><CODE>observe(Object, String)</CODE></A></DL>
</DD>
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<A NAME="retractInterestFor(com.jgoodies.binding.value.ValueModel)"><!-- --></A><H3>
retractInterestFor</H3>
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public void <B>retractInterestFor</B>(<A HREF="../../../../com/jgoodies/binding/value/ValueModel.html" title="interface in com.jgoodies.binding.value">ValueModel</A>&nbsp;valueModel)</PRE>
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<DD>Retracts interest for value changes in the given ValueModel.
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<DT><B>Parameters:</B><DD><CODE>valueModel</CODE> - the ValueModel to observe
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if the valueModel is null<DT><B>See Also:</B><DD><A HREF="../../../../com/jgoodies/binding/util/ChangeTracker.html#retractInterestFor(com.jgoodies.binding.value.ValueModel)"><CODE>retractInterestFor(ValueModel)</CODE></A></DL>
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