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/*******************************************************************************
* Copyright (c) 2008, 2010 Matthew Hall and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Matthew Hall - initial API and implementation (bug 194734)
* Matthew Hall - bugs 195222, 247997, 265561
******************************************************************************/
package org.eclipse.core.databinding.property.value;
import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.databinding.observable.list.IObservableList;
import org.eclipse.core.databinding.observable.map.IObservableMap;
import org.eclipse.core.databinding.observable.set.IObservableSet;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.observable.value.ValueDiff;
import org.eclipse.core.databinding.property.INativePropertyListener;
import org.eclipse.core.databinding.property.ISimplePropertyListener;
import org.eclipse.core.internal.databinding.property.value.ListSimpleValueObservableList;
import org.eclipse.core.internal.databinding.property.value.MapSimpleValueObservableMap;
import org.eclipse.core.internal.databinding.property.value.SetSimpleValueObservableMap;
import org.eclipse.core.internal.databinding.property.value.SimplePropertyObservableValue;
/**
* Simplified abstract implementation of IValueProperty. This class takes care
* of most of the functional requirements for an IValueProperty implementation,
* leaving only the property-specific details to subclasses.
* <p>
* Subclasses must implement these methods:
* <ul>
* <li> {@link #getValueType()}
* <li> {@link #doGetValue(Object)}
* <li> {@link #doSetValue(Object, Object)}
* <li> {@link #adaptListener(ISimplePropertyListener)}
* </ul>
* <p>
* In addition, we recommended overriding {@link #toString()} to return a
* description suitable for debugging purposes.
*
* @param <S>
* type of the source object
* @param <T>
* type of the value of the property
* @since 1.2
*/
public abstract class SimpleValueProperty<S, T> extends ValueProperty<S, T> {
protected abstract T doGetValue(S source);
protected abstract void doSetValue(S source, T value);
/**
* Returns a listener capable of adding or removing itself as a listener on
* a source object using the the source's "native" listener API. Events
* received from the source objects are parlayed to the specified listener
* argument.
* <p>
* This method returns null if the source object has no listener APIs for
* this property.
*
* @param listener
* the property listener to receive events
* @return a native listener which parlays property change events to the
* specified listener, or null if the source object has no listener
* APIs for this property.
* @noreference This method is not intended to be referenced by clients.
*/
public abstract INativePropertyListener<S> adaptListener(
ISimplePropertyListener<ValueDiff<T>> listener);
public IObservableValue<T> observe(Realm realm, S source) {
return new SimplePropertyObservableValue<S, T>(realm, source, this);
}
public <U extends S> IObservableList<T> observeDetail(
IObservableList<U> master) {
return new ListSimpleValueObservableList<S, U, T>(master, this);
}
public <U extends S> IObservableMap<U, T> observeDetail(
IObservableSet<U> master) {
return new SetSimpleValueObservableMap<S, U, T>(master, this);
}
public <K, V extends S> IObservableMap<K, T> observeDetail(
IObservableMap<K, V> master) {
return new MapSimpleValueObservableMap<S, K, V, T>(master, this);
}
}
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