Includes validator framework and completes Task 3

4 files changed, 110 insertions, 0 deletions

diff --git a/src/de/fhswf/fbin/java2fx/validation/StatusEvent.java b/src/de/fhswf/fbin/java2fx/validation/StatusEvent.java
new file mode 100644
index 0000000..3a6ce24
--- /dev/null
+++ b/src/de/fhswf/fbin/java2fx/validation/StatusEvent.java
@@ -0,0 +1,24 @@
+package de.fhswf.fbin.java2fx.validation;
+
+public class StatusEvent<T>
+{
+   private boolean status;
+   private T value;
+   
+   public StatusEvent(T value, boolean status)
+   {
+      super();
+      this.status = status;
+      this.value = value;
+   }
+   
+   public boolean isStatus()
+   {
+      return status;
+   }
+   
+   public T getValue()
+   {
+      return value;
+   }
+}
diff --git a/src/de/fhswf/fbin/java2fx/validation/StatusListener.java b/src/de/fhswf/fbin/java2fx/validation/StatusListener.java
new file mode 100644
index 0000000..26b341d
--- /dev/null
+++ b/src/de/fhswf/fbin/java2fx/validation/StatusListener.java
@@ -0,0 +1,6 @@
+package de.fhswf.fbin.java2fx.validation;
+
+public interface StatusListener<T>
+{
+   public void stateChanged(StatusEvent<T> e);
+}
diff --git a/src/de/fhswf/fbin/java2fx/validation/ValidationAdapter.java b/src/de/fhswf/fbin/java2fx/validation/ValidationAdapter.java
new file mode 100644
index 0000000..6b6afea
--- /dev/null
+++ b/src/de/fhswf/fbin/java2fx/validation/ValidationAdapter.java
@@ -0,0 +1,64 @@
+package de.fhswf.fbin.java2fx.validation;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javafx.beans.value.ObservableValue;
+
+public abstract class ValidationAdapter<T> implements Validator<T>
+{
+   private List<StatusListener<T>> listeners;
+
+   private boolean wasValid = true;
+
+   // Partial implementation of interface Validator
+   public boolean validate(T value)
+   {
+      boolean isValidNow = isValid(value);
+      if (isValidNow != wasValid)
+      { // state changed
+         fireChangedEvent(value, isValidNow);
+         wasValid = isValidNow;
+      }
+      return (isValidNow);
+   }
+
+   // Implementation of interface ChangeListener<T>
+   @Override
+   public void changed(ObservableValue<? extends T> observable, T oldValue,
+         T newValue)
+   {
+      validate(newValue);
+   }
+
+   // Support for StatusListeners
+   public void addStatusListener(StatusListener<T> l)
+   {
+      if (listeners == null)
+      {
+         listeners = new ArrayList<>();
+      }
+
+      listeners.add(l);
+   }
+
+   public void removeStatusListener(StatusListener<T> l)
+   {
+      if (listeners != null)
+      {
+         listeners.remove(l);
+      }
+   }
+
+   public void fireChangedEvent(T value, boolean status)
+   {
+      if (listeners != null)
+      {
+         StatusEvent<T> event = new StatusEvent<T>(value, status);
+         for (StatusListener<T> sl : listeners)
+         {
+            sl.stateChanged(event);
+         }
+      }
+   }
+}
diff --git a/src/de/fhswf/fbin/java2fx/validation/Validator.java b/src/de/fhswf/fbin/java2fx/validation/Validator.java
new file mode 100644
index 0000000..ee23298
--- /dev/null
+++ b/src/de/fhswf/fbin/java2fx/validation/Validator.java
@@ -0,0 +1,16 @@
+package de.fhswf.fbin.java2fx.validation;
+
+import javafx.beans.value.ChangeListener;
+
+public interface Validator<T> extends ChangeListener<T>
+{
+
+   public boolean isValid(T value);
+
+   public boolean validate(T value);
+
+   // support StatusListeners
+   public void addStatusListener(StatusListener<T> l);
+
+   public void removeStatusListener(StatusListener<T> l);
+}