Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>There is no <a href="http://en.wikipedia.org/wiki/Logical_conjunction">conjunction</a> api defined in the JavaFX 2.2 platform.</p> <p>You could create a <code>ConjunctionBooleanBinding</code> (aka <code>AllTrueBinding</code>) by subclassing <a href="http://docs.oracle.com/javafx/2/api/javafx/beans/binding/BooleanBinding.html">BooleanBinding</a>. </p> <p>Accept the <a href="http://docs.oracle.com/javafx/2/api/javafx/collections/ObservableList.html">ObservableList</a> in the constructor of your new class, and use the <a href="http://docs.oracle.com/javafx/2/binding/jfxpub-binding.htm">low level binding api</a> in an overridden <a href="http://docs.oracle.com/javafx/2/api/javafx/beans/binding/BooleanBinding.html#computeValue%28%29">computeValue</a> method to set the binding value based upon logically anding together all of the boolean values in the list.</p> <p>Here is a sample implementation. The sample could be further performance optimized and make use of WeakReferences, so it does not require manual disposition.</p> <pre><code>import javafx.beans.binding.BooleanBinding; import javafx.beans.property.BooleanProperty; import javafx.collections.*; public class AllTrueBinding extends BooleanBinding { private final ObservableList&lt;BooleanProperty&gt; boundList; private final ListChangeListener&lt;BooleanProperty&gt; BOUND_LIST_CHANGE_LISTENER = new ListChangeListener&lt;BooleanProperty&gt;() { @Override public void onChanged( ListChangeListener.Change&lt;? extends BooleanProperty&gt; change ) { refreshBinding(); } }; private BooleanProperty[] observedProperties = {}; AllTrueBinding(ObservableList&lt;BooleanProperty&gt; booleanList) { booleanList.addListener(BOUND_LIST_CHANGE_LISTENER); boundList = booleanList; refreshBinding(); } @Override protected boolean computeValue() { for (BooleanProperty bp: observedProperties) { if (!bp.get()) { return false; } } return true; } @Override public void dispose() { boundList.removeListener(BOUND_LIST_CHANGE_LISTENER); super.dispose(); } private void refreshBinding() { super.unbind(observedProperties); observedProperties = boundList.toArray(new BooleanProperty[0]); super.bind(observedProperties); this.invalidate(); } } </code></pre> <p>And here is a test harness to demonstrate how it works:</p> <pre><code>import java.util.*; import javafx.beans.property.*; import javafx.collections.FXCollections; import javafx.collections.ObservableList; public class ListBindingTest { final BooleanProperty a = new SimpleBooleanProperty(true); final BooleanProperty b = new SimpleBooleanProperty(true); final BooleanProperty c = new SimpleBooleanProperty(true); final BooleanProperty d = new SimpleBooleanProperty(true); final ObservableList&lt;BooleanProperty&gt; booleanList = FXCollections.observableArrayList(a, b, c, d); public static void main(String[] args) { new ListBindingTest().test(); } private void test() { AllTrueBinding at = new AllTrueBinding(booleanList); System.out.println(at.get() + forArrayString(booleanList)); b.set(false); System.out.println(at.get() + forArrayString(booleanList)); b.set(true); System.out.println(at.get() + forArrayString(booleanList)); booleanList.add(new SimpleBooleanProperty(false)); System.out.println(at.get() + forArrayString(booleanList)); booleanList.remove(3, 5); System.out.println(at.get() + forArrayString(booleanList)); at.dispose(); } private String forArrayString(List list) { return " for " + Arrays.toString(list.toArray()); } } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POJavaFX - bind property to properties of every element in observable Collection
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USjewelsea
    1. USjewelsea
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POJavaFX - bind property to properties of every element in observable Collection
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThanks, I used your advice.
      singulars
      1. PO
      1. USdpelisek
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload