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<h1 title="Package" class="title">Package javafx.beans.binding</h1>
<div class="docSummary">
<div class="block">Characteristics of Bindings</div>
</div>
<p>See: <a href="#package.description">Description</a></p>
</div>
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<table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Interface Summary table, listing interfaces, and an explanation">
<caption><span>Interface Summary</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Interface</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/Binding.html" title="interface in javafx.beans.binding">Binding</a><T></td>
<td class="colLast">
<div class="block">A <code>Binding</code> calculates a value that depends on one or more sources.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/NumberBinding.html" title="interface in javafx.beans.binding">NumberBinding</a></td>
<td class="colLast">
<div class="block">A tagging interface to mark all Bindings that wrap a number-value.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/NumberExpression.html" title="interface in javafx.beans.binding">NumberExpression</a></td>
<td class="colLast">
<div class="block">A <code>NumberExpression</code> is a
<a href="../../../javafx/beans/value/ObservableNumberValue.html" title="interface in javafx.beans.value"><code>ObservableNumberValue</code></a> plus additional convenience
methods to generate bindings in a fluent style.</div>
</td>
</tr>
</tbody>
</table>
</li>
<li class="blockList">
<table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Class Summary table, listing classes, and an explanation">
<caption><span>Class Summary</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Class</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/Bindings.html" title="class in javafx.beans.binding">Bindings</a></td>
<td class="colLast">
<div class="block">Bindings is a helper class with a lot of utility functions to create simple
bindings.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/BooleanBinding.html" title="class in javafx.beans.binding">BooleanBinding</a></td>
<td class="colLast">
<div class="block">Base class that provides most of the functionality needed to implement a
<a href="../../../javafx/beans/binding/Binding.html" title="interface in javafx.beans.binding"><code>Binding</code></a> of a <code>boolean</code> value.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/BooleanExpression.html" title="class in javafx.beans.binding">BooleanExpression</a></td>
<td class="colLast">
<div class="block">A <code>BooleanExpression</code> is a
<a href="../../../javafx/beans/value/ObservableBooleanValue.html" title="interface in javafx.beans.value"><code>ObservableBooleanValue</code></a> plus additional convenience
methods to generate bindings in a fluent style.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/DoubleBinding.html" title="class in javafx.beans.binding">DoubleBinding</a></td>
<td class="colLast">
<div class="block">Base class that provides most of the functionality needed to implement a
<a href="../../../javafx/beans/binding/Binding.html" title="interface in javafx.beans.binding"><code>Binding</code></a> of a <code>double</code> value.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/DoubleExpression.html" title="class in javafx.beans.binding">DoubleExpression</a></td>
<td class="colLast">
<div class="block">A <code>DoubleExpression</code> is a
<a href="../../../javafx/beans/value/ObservableDoubleValue.html" title="interface in javafx.beans.value"><code>ObservableDoubleValue</code></a> plus additional convenience
methods to generate bindings in a fluent style.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/FloatBinding.html" title="class in javafx.beans.binding">FloatBinding</a></td>
<td class="colLast">
<div class="block">Base class that provides most of the functionality needed to implement a
<a href="../../../javafx/beans/binding/Binding.html" title="interface in javafx.beans.binding"><code>Binding</code></a> of a <code>float</code> value.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/FloatExpression.html" title="class in javafx.beans.binding">FloatExpression</a></td>
<td class="colLast">
<div class="block">A <code>FloatExpression</code> is a
<a href="../../../javafx/beans/value/ObservableFloatValue.html" title="interface in javafx.beans.value"><code>ObservableFloatValue</code></a> plus additional convenience
methods to generate bindings in a fluent style.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/IntegerBinding.html" title="class in javafx.beans.binding">IntegerBinding</a></td>
<td class="colLast">
<div class="block">Base class that provides most of the functionality needed to implement a
<a href="../../../javafx/beans/binding/Binding.html" title="interface in javafx.beans.binding"><code>Binding</code></a> of an <code>int</code> value.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/IntegerExpression.html" title="class in javafx.beans.binding">IntegerExpression</a></td>
<td class="colLast">
<div class="block">A <code>IntegerExpression</code> is a
<a href="../../../javafx/beans/value/ObservableIntegerValue.html" title="interface in javafx.beans.value"><code>ObservableIntegerValue</code></a> plus additional convenience
methods to generate bindings in a fluent style.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/ListBinding.html" title="class in javafx.beans.binding">ListBinding</a><E></td>
<td class="colLast">
<div class="block">Base class that provides most of the functionality needed to implement a
<a href="../../../javafx/beans/binding/Binding.html" title="interface in javafx.beans.binding"><code>Binding</code></a> of an <a href="../../../javafx/collections/ObservableList.html" title="interface in javafx.collections"><code>ObservableList</code></a>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/ListExpression.html" title="class in javafx.beans.binding">ListExpression</a><E></td>
<td class="colLast">
<div class="block">A <code>ListExpression</code> is a
<a href="../../../javafx/beans/value/ObservableListValue.html" title="interface in javafx.beans.value"><code>ObservableListValue</code></a> plus additional convenience
methods to generate bindings in a fluent style.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/LongBinding.html" title="class in javafx.beans.binding">LongBinding</a></td>
<td class="colLast">
<div class="block">Base class that provides most of the functionality needed to implement a
<a href="../../../javafx/beans/binding/Binding.html" title="interface in javafx.beans.binding"><code>Binding</code></a> of a <code>long</code> value.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/LongExpression.html" title="class in javafx.beans.binding">LongExpression</a></td>
<td class="colLast">
<div class="block">A <code>LongExpression</code> is a <a href="../../../javafx/beans/value/ObservableLongValue.html" title="interface in javafx.beans.value"><code>ObservableLongValue</code></a>
plus additional convenience methods to generate bindings in a fluent style.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/MapBinding.html" title="class in javafx.beans.binding">MapBinding</a><K,V></td>
<td class="colLast">
<div class="block">Base class that provides most of the functionality needed to implement a
<a href="../../../javafx/beans/binding/Binding.html" title="interface in javafx.beans.binding"><code>Binding</code></a> of an <a href="../../../javafx/collections/ObservableMap.html" title="interface in javafx.collections"><code>ObservableMap</code></a>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/MapExpression.html" title="class in javafx.beans.binding">MapExpression</a><K,V></td>
<td class="colLast">
<div class="block">A <code>MapExpression</code> is a
<a href="../../../javafx/beans/value/ObservableMapValue.html" title="interface in javafx.beans.value"><code>ObservableMapValue</code></a> plus additional convenience
methods to generate bindings in a fluent style.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/NumberExpressionBase.html" title="class in javafx.beans.binding">NumberExpressionBase</a></td>
<td class="colLast">
<div class="block">A <code>NumberExpressionBase</code> contains convenience methods to generate bindings in a fluent style,
that are common to all NumberExpression subclasses.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/ObjectBinding.html" title="class in javafx.beans.binding">ObjectBinding</a><T></td>
<td class="colLast">
<div class="block">Base class that provides most of the functionality needed to implement a
<a href="../../../javafx/beans/binding/Binding.html" title="interface in javafx.beans.binding"><code>Binding</code></a> of an <code>Object</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/ObjectExpression.html" title="class in javafx.beans.binding">ObjectExpression</a><T></td>
<td class="colLast">
<div class="block">A <code>ObjectExpression</code> is a
<a href="../../../javafx/beans/value/ObservableObjectValue.html" title="interface in javafx.beans.value"><code>ObservableObjectValue</code></a> plus additional convenience
methods to generate bindings in a fluent style.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/SetBinding.html" title="class in javafx.beans.binding">SetBinding</a><E></td>
<td class="colLast">
<div class="block">Base class that provides most of the functionality needed to implement a
<a href="../../../javafx/beans/binding/Binding.html" title="interface in javafx.beans.binding"><code>Binding</code></a> of an <a href="../../../javafx/collections/ObservableSet.html" title="interface in javafx.collections"><code>ObservableSet</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/SetExpression.html" title="class in javafx.beans.binding">SetExpression</a><E></td>
<td class="colLast">
<div class="block">A <code>SetExpression</code> is a
<a href="../../../javafx/beans/value/ObservableSetValue.html" title="interface in javafx.beans.value"><code>ObservableSetValue</code></a> plus additional convenience
methods to generate bindings in a fluent style.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/StringBinding.html" title="class in javafx.beans.binding">StringBinding</a></td>
<td class="colLast">
<div class="block">Base class that provides most of the functionality needed to implement a
<a href="../../../javafx/beans/binding/Binding.html" title="interface in javafx.beans.binding"><code>Binding</code></a> of a <code>String</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/StringExpression.html" title="class in javafx.beans.binding">StringExpression</a></td>
<td class="colLast">
<div class="block">A <code>StringExpression</code> is a
<a href="../../../javafx/beans/value/ObservableStringValue.html" title="interface in javafx.beans.value"><code>ObservableStringValue</code></a> plus additional convenience
methods to generate bindings in a fluent style.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../javafx/beans/binding/When.html" title="class in javafx.beans.binding">When</a></td>
<td class="colLast">
<div class="block">Starting point for a binding that calculates a ternary expression.</div>
</td>
</tr>
</tbody>
</table>
</li>
</ul>
<a name="package.description">
<!-- -->
</a>
<h2 title="Package javafx.beans.binding Description">Package javafx.beans.binding Description</h2>
<div class="block"><h1>Characteristics of Bindings</h1>
<p>Bindings are assembled from one or more sources, usually called
their dependencies. A binding observes its dependencies for changes
and updates its own value according to changes in the dependencies.</p>
<p>Almost all bindings defined in this library require
implementations of <a href="../../../javafx/beans/Observable.html" title="interface in javafx.beans"><code>Observable</code></a> for their
dependencies. There are two types of implementations already provided,
the properties in the package <code>javafx.beans.property</code> and the
observable collections (<a href="../../../javafx/collections/ObservableList.html" title="interface in javafx.collections"><code>ObservableList</code></a> and
<a href="../../../javafx/collections/ObservableMap.html" title="interface in javafx.collections"><code>ObservableMap</code></a>). Bindings also implement
<code>Observable</code> and can again serve as sources for other bindings
allowing to construct very complex bindings from simple ones.</p>
<p>Bindings in our implementation are always calculated lazily.
That means, if a dependency changes, the result of a binding is not
immediately recalculated, but it is marked as invalid. Next time the
value of an invalid binding is requested, it is recalculated.</p>
<h1>High Level API and Low Level API</h1>
<p>The Binding API is roughly divided in two parts, the High Level
Binding API and the Low Level Binding API. The High Level Binding API
allows to construct simple bindings in an easy to use fashion.
Defining a binding with the High Level API should be straightforward,
especially when used in an IDE that provides code completion.
Unfortunately it has its limitation and at that point the Low Level
API comes into play. Experienced Java developers can use the Low Level
API to define bindings, if the functionality of the High Level API is
not sufficient or to improve the performance. The main goals of the
Low Level API are fast execution and small memory footprint.</p>
<p>Following is an example of how both APIs can be used. Assuming
we have four instances of <a href="../../../javafx/beans/property/DoubleProperty.html" title="class in javafx.beans.property"><code>DoubleProperty</code></a> <code>a</code>, <code>b</code>, <code>c</code> , and <code>d</code>, we can define a binding that calculates <code>a*b
+ c*d</code> with the High Level API for example like this:</p>
<p><code>NumberBinding result = Bindings.add (a.multiply(b),
c.multiply(d)); </code></p>
<p>Defining the same binding using the Low Level API could be done
like this:</p>
<pre>
<code>
DoubleBinding foo = new DoubleBinding() {
{
super.bind(a, b, c, d);
}
@Override
protected double computeValue() {
return a.getValue() * b.getValue() + c.getValue() * d.getValue();
}
};
</code>
</pre></div>
</div>
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<p class="legalCopy"><small><font size="-1"><a href="http://bugreport.java.com/bugreport/" target="_blank">Submit a bug or feature</a><br>For further API reference and developer documentation, see <a href="https://docs.oracle.com/javase/8/docs/index.html" target="_blank">Java SE Documentation</a>. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.<br> <a href="https://docs.oracle.com/javase/8/docs/legal/cpyr.html" target="_blank">Copyright</a> © 2008, 2016, Oracle and/or its affiliates. All rights reserved. Use is subject to <a href="http://download.oracle.com/otndocs/jcp/java_se-8-mrel-spec/license.html" target="_blank">license terms</a>. Also see the <a target="_blank" href="http://www.oracle.com/technetwork/java/redist-137594.html" target="_blank">documentation redistribution policy</a>.</font></small></p>
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