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Merge pull request #46 from sillydan1/feat/less-boilerplate
Feature: AutoProperty construct to reduce boilerplate code for new syntaxes
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213 changes: 213 additions & 0 deletions
213
core/src/main/java/dk/gtz/graphedit/viewmodel/AutoProperty.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,213 @@ | ||
| package dk.gtz.graphedit.viewmodel; | ||
|
|
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| import java.lang.reflect.Field; | ||
| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
|
|
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
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| import javafx.beans.InvalidationListener; | ||
| import javafx.beans.property.Property; | ||
| import javafx.beans.value.ChangeListener; | ||
| import javafx.beans.value.ObservableValue; | ||
| import javafx.beans.value.WritableObjectValue; | ||
|
|
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| public abstract class AutoProperty<T extends Property<T>> implements Property<T> { | ||
| private static Logger logger = LoggerFactory.getLogger(AutoProperty.class); | ||
| private T value; | ||
| private List<Field> fields; | ||
| private final Map<Field, ChangeListener<? super Object>> changeListeners; | ||
| private final Map<Field, InvalidationListener> invalidationListeners; | ||
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| protected AutoProperty() { | ||
| this.changeListeners = new HashMap<>(); | ||
| this.invalidationListeners = new HashMap<>(); | ||
| } | ||
|
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| protected void loadFields(Class<?> clazz, T value) { | ||
| this.value = value; | ||
| fields = new ArrayList<>(); | ||
| for(var field : clazz.getFields()) | ||
| if(List.of(field.getAnnotations()) | ||
| .stream() | ||
| .anyMatch(a -> a | ||
| .annotationType() | ||
| .getSimpleName() | ||
| .equals(Autolisten.class.getSimpleName()))) | ||
| fields.add(field); | ||
| } | ||
|
|
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| @Override | ||
| public void addListener(ChangeListener<? super T> listener) { | ||
| for(var field : fields) { | ||
| var isObservable = ObservableValue.class.isAssignableFrom(field.getType()); | ||
| if(!isObservable) | ||
| continue; | ||
| try { | ||
| var observable = (ObservableValue<?>)field.get(value); | ||
| if(!changeListeners.containsKey(field)) | ||
| changeListeners.put(field, (e,o,n) -> listener.changed(value, value, value)); | ||
| observable.addListener(changeListeners.get(field)); | ||
| } catch (IllegalAccessException e) { | ||
| logger.error("error adding listener '{}': {}", field.getName(), e.getMessage(), e); | ||
| } | ||
| } | ||
| } | ||
|
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| @Override | ||
| public void removeListener(ChangeListener<? super T> listener) { | ||
| for(var field : fields) { | ||
| var isObservable = ObservableValue.class.isAssignableFrom(field.getType()); | ||
| if(!isObservable) | ||
| continue; | ||
| try { | ||
| var observable = (ObservableValue<?>)field.get(value); | ||
| if(changeListeners.containsKey(field)) | ||
| observable.addListener(changeListeners.get(field)); | ||
| else // BUG: This probably doesnt work, but it doesn't hurt to try | ||
| observable.addListener((e,o,n) -> listener.changed(value, value, value)); | ||
| } catch (IllegalAccessException e) { | ||
| logger.error("error removing listener '{}': {}", field.getName(), e.getMessage(), e); | ||
| } | ||
| } | ||
| } | ||
|
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| @Override | ||
| public void addListener(InvalidationListener listener) { | ||
| for(var field : fields) { | ||
| if(!field.getType().isAssignableFrom(ObservableValue.class)) | ||
| continue; | ||
| try { | ||
| var observable = (ObservableValue<?>)field.get(value); | ||
| if(!invalidationListeners.containsKey(field)) | ||
| invalidationListeners.put(field, listener); | ||
| observable.addListener(invalidationListeners.get(field)); | ||
| } catch (IllegalAccessException e) { | ||
| logger.error("error adding invalidation listener '{}': {}", field.getName(), e.getMessage(), e); | ||
| } | ||
| } | ||
| } | ||
|
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| @Override | ||
| public void removeListener(InvalidationListener listener) { | ||
| for(var field : fields) { | ||
| var isObservable = ObservableValue.class.isAssignableFrom(field.getType()); | ||
| if(!isObservable) | ||
| continue; | ||
| try { | ||
| var observable = (ObservableValue<?>)field.get(value); | ||
| if(invalidationListeners.containsKey(field)) | ||
| observable.addListener(invalidationListeners.get(field)); | ||
| else // BUG: This probably doesnt work, but it doesn't hurt to try | ||
| observable.addListener(listener); | ||
| } catch (IllegalAccessException e) { | ||
| logger.error("error removing invalidation listener '{}': {}", field.getName(), e.getMessage(), e); | ||
| } | ||
| } | ||
| } | ||
|
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| @Override | ||
| @SuppressWarnings({ "unchecked", "rawtypes" }) | ||
| public void bind(ObservableValue<? extends T> observable) { | ||
| for(var field : fields) { | ||
| if(!field.getType().isAssignableFrom(Property.class)) | ||
| continue; | ||
| try { | ||
| var thisObservable = (Property)field.get(value); | ||
| var thatObservable = (Property)field.get(observable.getValue()); | ||
| thisObservable.bind(thatObservable); | ||
| } catch (IllegalAccessException e) { | ||
| logger.error("error binding '{}': {}", field.getName(), e.getMessage(), e); | ||
| } | ||
| } | ||
| } | ||
|
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| @Override | ||
| public void unbind() { | ||
| for(var field : fields) { | ||
| var isProperty = Property.class.isAssignableFrom(field.getType()); | ||
| if(!isProperty) | ||
| continue; | ||
| try { | ||
| ((Property<?>)field.get(value)).unbind(); | ||
| } catch (IllegalAccessException e) { | ||
| logger.error("error binding '{}': {}", field.getName(), e.getMessage(), e); | ||
| } | ||
| } | ||
| } | ||
|
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| @Override | ||
| public boolean isBound() { | ||
| for(var field : fields) { | ||
| var isProperty = Property.class.isAssignableFrom(field.getType()); | ||
| if(!isProperty) | ||
| continue; | ||
| try { | ||
| if(((Property<?>)field.get(value)).isBound()) | ||
| return true; | ||
| } catch (IllegalAccessException e) { | ||
| logger.error("isBound error '{}': {}", field.getName(), e.getMessage(), e); | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
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| @Override | ||
| @SuppressWarnings({ "rawtypes", "unchecked" }) | ||
| public void bindBidirectional(Property<T> other) { | ||
| for(var field : fields) { | ||
| var isProperty = Property.class.isAssignableFrom(field.getType()); | ||
| if(!isProperty) | ||
| continue; | ||
| try { | ||
| var thisObservable = (Property)field.get(value); | ||
| var thatObservable = (Property)field.get(other); | ||
| thisObservable.bindBidirectional(thatObservable); | ||
| } catch (IllegalAccessException e) { | ||
| logger.error("error binding bidirectionally '{}': {}", field.getName(), e.getMessage(), e); | ||
| } | ||
| } | ||
| } | ||
|
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| @Override | ||
| @SuppressWarnings({ "unchecked", "rawtypes" }) | ||
| public void unbindBidirectional(Property<T> other) { | ||
| for(var field : fields) { | ||
| var isProperty = Property.class.isAssignableFrom(field.getType()); | ||
| if(!isProperty) | ||
| continue; | ||
| try { | ||
| var thisObservable = (Property)field.get(value); | ||
| var thatObservable = (Property)field.get(other); | ||
| thisObservable.unbindBidirectional(thatObservable); | ||
| } catch (IllegalAccessException e) { | ||
| logger.error("error unbinding bidirectionally '{}': {}", field.getName(), e.getMessage(), e); | ||
| } | ||
| } | ||
| } | ||
|
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| @Override | ||
| public Object getBean() { | ||
| return null; | ||
| } | ||
|
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| @Override | ||
| @SuppressWarnings({ "rawtypes", "unchecked" }) | ||
| public void setValue(T value) { | ||
| for(var field : fields) { | ||
| var isWritable = WritableObjectValue.class.isAssignableFrom(field.getType()); | ||
| if(!isWritable) | ||
| continue; | ||
| try { | ||
| var thisObservable = (WritableObjectValue)field.get(this.value); | ||
| var thatObservable = (WritableObjectValue)field.get(value); | ||
| thisObservable.set(thatObservable.get()); | ||
| } catch (IllegalAccessException e) { | ||
| logger.error("error setting value '{}': {}", field.getName(), e.getMessage(), e); | ||
| } | ||
| } | ||
| } | ||
| } |
7 changes: 7 additions & 0 deletions
7
core/src/main/java/dk/gtz/graphedit/viewmodel/Autolisten.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| package dk.gtz.graphedit.viewmodel; | ||
|
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| import java.lang.annotation.Retention; | ||
| import java.lang.annotation.RetentionPolicy; | ||
|
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| @Retention(RetentionPolicy.RUNTIME) | ||
| public @interface Autolisten {} |
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