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/*******************************************************************************
* Copyright (c) 2016 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.internal.model.value;
import org.eclipse.jpt.common.utility.closure.BiClosure;
import org.eclipse.jpt.common.utility.internal.ObjectTools;
import org.eclipse.jpt.common.utility.model.value.ModifiablePropertyValueModel;
import org.eclipse.jpt.common.utility.transformer.Transformer;
/**
* Adapt a {@link ModifiablePropertyValueModel property value model} to
* another {@link ModifiablePropertyValueModel property value model}, sorta.
* <p>
* This adapter is constructed with a {@link ModifiablePropertyValueModel
* property value model} and two {@link Transformer transformers} that can
* transform the property to another value and vice versa.
* <p>
* This is an adapter that can be used by a {@link PluggableModifiablePropertyValueModel}.
*
* @param <V> the type of the adapter's value
* @param <S> the type of the subject (and the subject model's value)
*
* @see PluggableModifiablePropertyValueModel
*/
public final class ModifiablePropertyAspectAdapter<V, S>
implements PluggableModifiablePropertyValueModel.Adapter<V>
{
/** The adapter used to "get" the subject's aspect value. */
private final GetAdapter<V, S> getAdapter;
/** The closure used to "set" the subject's new aspect value. */
private final BiClosure<? super S, ? super V> setClosure;
public ModifiablePropertyAspectAdapter(GetAdapter<V, S> getAdapter, BiClosure<? super S, ? super V> setClosure) {
super();
if (getAdapter == null) {
throw new NullPointerException();
}
this.getAdapter = getAdapter;
if (setClosure == null) {
throw new NullPointerException();
}
this.setClosure = setClosure;
}
public V engageModel() {
return this.getAdapter.engageModel();
}
public V disengageModel() {
return this.getAdapter.disengageModel();
}
public void setValue(V value) {
this.setClosure.execute(this.getAdapter.getSubject(), value);
}
@Override
public String toString() {
return ObjectTools.toString(this, this.getAdapter);
}
/**
* Extend the pluggable pvm adapter so we can get the
* other adapter's subject and set the value of its aspect.
*/
public interface GetAdapter<V, S>
extends PluggablePropertyValueModel.Adapter<V>
{
/**
* Return the adapter's subject.
*/
S getSubject();
interface Factory<V, S> {
GetAdapter<V, S> buildAdapter(BasePluggablePropertyValueModel.Adapter.Listener<V> listener);
}
}
// ********** Factory **********
public static final class Factory<V, S>
implements PluggableModifiablePropertyValueModel.Adapter.Factory<V>
{
private final ModifiablePropertyAspectAdapter.GetAdapter.Factory<V, S> getAdapterFactory;
private final BiClosure<? super S, ? super V> setClosure;
public Factory(GetAdapter.Factory<V, S> getAdapterFactory, BiClosure<? super S, ? super V> setClosure) {
super();
if (getAdapterFactory == null) {
throw new NullPointerException();
}
this.getAdapterFactory = getAdapterFactory;
if (setClosure == null) {
throw new NullPointerException();
}
this.setClosure = setClosure;
}
@Override
public PluggableModifiablePropertyValueModel.Adapter<V> buildAdapter(BasePluggablePropertyValueModel.Adapter.Listener<V> listener) {
return new ModifiablePropertyAspectAdapter<>(this.getAdapterFactory.buildAdapter(listener), this.setClosure);
}
}
}
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