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/*****************************************************************************
* Copyright (c) 2015 Christian W. Damus 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:
* Christian W. Damus - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.infra.sync.service;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.MultiStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.papyrus.infra.sync.Activator;
import org.eclipse.papyrus.infra.sync.internal.SyncService;
import com.google.common.base.Function;
/**
* A sync action that cascades the evaluation of triggers to related objects.
*/
public class CascadeTriggers implements ISyncAction {
private final ISyncService service = SyncService.getCurrent();
private Function<Object, ? extends Iterable<?>> cascadeFunction;
public CascadeTriggers() {
this(null);
}
/**
* Initializes me with a cascade function.
*/
public CascadeTriggers(Function<Object, ? extends Iterable<?>> cascadeFunction) {
super();
this.cascadeFunction = cascadeFunction;
}
/**
* Assigns a function that I use to compute the objects to which to cascade the
* evaluation of synchronization triggers.
*/
public void setCascadeFunction(Function<Object, ? extends Iterable<?>> cascadeFunction) {
this.cascadeFunction = cascadeFunction;
}
/**
* Evaluates sync triggers on the objects related to the given triggered {@code object} by my
* {@linkplain #setCascadeFunction(Function) cascade function}.
*/
@Override
public IStatus perform(ISyncService syncService, Object object) {
IStatus result = Status.OK_STATUS;
for (Object next : cascade(object)) {
IStatus nextResult = service.evaluateTriggers(next);
if ((nextResult != null) && !nextResult.isOK()) {
if (result.isOK()) {
result = nextResult;
} else if (result.isMultiStatus()) {
((MultiStatus) result).merge(nextResult);
} else {
result = new MultiStatus(Activator.PLUGIN_ID, 0, new IStatus[] { result, nextResult }, "Multiple sync trigger cascade problems occurred.", null);
}
}
}
return result;
}
/**
* Obtains the objects on which to evaluate cascaded sync triggers, based on the given {@code triggered} object.
*
* @throws IllegalStateException
* if I have no {@linkplain #setCascadeFunction(Function) cascade function} with which
* to compute the cascaded triggers
*/
protected Iterable<?> cascade(Object triggered) {
if (cascadeFunction == null) {
throw new IllegalStateException("no cascade function"); //$NON-NLS-1$
}
return cascadeFunction.apply(triggered);
}
}
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