Bindings.Select does not work with the primitive properties like string etc?
My code works when I use a < String > ObjectProperty, this however does not work when I use a string instead.
Don't know if this Bindings.select behavior is a bug or expected.
The NBS are:
The impression is:
ObjectProperty < String >--> < String > ObjectProperty: abc
String-> string: null
String-> < String > ObjectProperty: null
I expect all cases to print 'abc' good
import javafx.beans.binding.Bindings; import javafx.beans.property.ObjectProperty; import javafx.beans.property.SimpleObjectProperty; import javafx.beans.property.SimpleStringProperty; import javafx.beans.property.StringProperty; public class SelectBindingTest { public static class A { private StringProperty comment = new SimpleStringProperty(this, "comment"); private ObjectProperty<String> commentObj = new SimpleObjectProperty<>(this, "commentObj"); String getComment() { return comment.get(); } StringProperty commentProperty() { return comment; } void setComment(String comment) { this.comment.set(comment); } public String getCommentObj() { return commentObj.get(); } public ObjectProperty<String> commentObjProperty() { return commentObj; } public void setCommentObj(String commentObj) { this.commentObj.set(commentObj); } } public static class B { private ObjectProperty<A> member = new SimpleObjectProperty<>(this, "member"); A getMember() { return member.get(); } ObjectProperty<A> memberProperty() { return member; } void setMember(A member) { this.member.set(member); } } public static void main(String[] args) { B b = new B(); A member = new A(); b.setMember(member); final String expectedString = "abc"; // this works SimpleObjectProperty<String> targetStringObjProperty = new SimpleObjectProperty<>("initialTargetText"); member.setCommentObj("initialSourceText"); targetStringObjProperty.bind(Bindings.<String>select(b.memberProperty(), "commentObj")); member.setCommentObj(expectedString); System.out.println("ObjectProperty<String> -> ObjectProperty<String>: " + targetStringObjProperty.get()); // this doesn't work SimpleStringProperty targetStringProperty = new SimpleStringProperty("initialTargetText"); member.setComment("initialSourceText"); targetStringProperty.bind(Bindings.selectString(b.memberProperty(), "comment")); member.setComment(expectedString); System.out.println("StringProperty -> StringProperty: " + targetStringProperty.get()); // this doesn't work either targetStringObjProperty = new SimpleObjectProperty<>("initialTargetText"); member.setComment("initialSourceText"); targetStringObjProperty.bind(Bindings.<String>select(b.memberProperty(), "comment")); member.setComment(expectedString); System.out.println("StringProperty -> ObjectProperty<String>: " + targetStringObjProperty.get()); } }
EDIT: Sorry for the horrible formatting. Can't seem to understand how to properly insert empty lines.
Read the fine print in http://docs.oracle.com/javafx/2/api/javafx/beans/binding/Bindings.html#select(javafx.beans.value.ObservableValue, java.lang.String...)
All classes and properties used in an affair of selection must be public.
If you do your commentProperty, getProperty (and setProperty, although I suppose it doesn't matter) methods in public class has, it works as expected.
Post edited by: James_D (link fixed javadoc)
Tags: Java
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