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/*
* Copyright (c) 2014 CEA 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 (CEA) - Initial API and implementation
*
*/
package org.eclipse.papyrus.views.modelexplorer;
import java.util.Arrays;
import java.util.EventListener;
import java.util.EventObject;
import java.util.Set;
import org.eclipse.core.commands.common.EventManager;
import org.eclipse.ui.IMemento;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Sets;
/**
* Shared persistent state (especially of tool-bar toggle actions) of the Model Explorer view pages.
*/
class SharedModelExplorerState extends EventManager {
private static final String LINKING_MEMENTO = "linkWithEditor"; //$NON-NLS-1$
private static final String ENABLED_ATTR = "enabled"; //$NON-NLS-1$
private static final String SORTING_MEMENTO = "sorting"; //$NON-NLS-1$
private static final String ALPHA_SORTED_ATTR = "alphaSorted"; //$NON-NLS-1$
private boolean linkingEnabled;
private boolean alphaSorted;
/** The active content extensions are persisted by the Common Navigator Framework, so we don't have to. */
private Set<String> navigatorContentExtensions = Sets.newHashSet();
SharedModelExplorerState() {
super();
}
public void setLinkingEnabled(boolean linkingEnabled) {
boolean oldValue = this.linkingEnabled;
this.linkingEnabled = linkingEnabled;
if(oldValue != linkingEnabled) {
fireStateChanged(StateChangedEvent.LINKING_ENABLED);
}
}
public boolean isLinkingEnabled() {
return linkingEnabled;
}
public void setAlphaSorted(boolean alphaSorted) {
boolean oldValue = this.alphaSorted;
this.alphaSorted = alphaSorted;
if(oldValue != alphaSorted) {
fireStateChanged(StateChangedEvent.ALPHA_SORTED);
}
}
public boolean isAlphaSorted() {
return alphaSorted;
}
public void updateNavigatorContentExtensions(String[] contentExtensionIDs, boolean activate) {
Set<String> oldValue = ImmutableSet.copyOf(this.navigatorContentExtensions);
if(activate) {
this.navigatorContentExtensions.addAll(Arrays.asList(contentExtensionIDs));
} else {
this.navigatorContentExtensions.removeAll(Arrays.asList(contentExtensionIDs));
}
if(!oldValue.equals(this.navigatorContentExtensions)) {
fireStateChanged(StateChangedEvent.CONTENT_EXTENSIONS);
}
}
public String[] getNavigatorContentExtensions() {
return Iterables.toArray(navigatorContentExtensions, String.class);
}
void load(IMemento memento) {
readLinking(memento);
readSorting(memento);
// Persistence of CNF content extensions is handled by that framework
}
public void save(IMemento memento) {
writeLinking(memento);
writeSorting(memento);
// Persistence of CNF content extensions is handled by that framework
}
private void readLinking(IMemento memento) {
IMemento linking = memento.getChild(LINKING_MEMENTO);
if(linking != null) {
Boolean enabled = linking.getBoolean(ENABLED_ATTR);
this.linkingEnabled = (enabled != null) && enabled.booleanValue();
}
}
private void writeLinking(IMemento memento) {
IMemento linking = memento.getChild(LINKING_MEMENTO);
if(linking == null) {
linking = memento.createChild(LINKING_MEMENTO);
}
linking.putBoolean(ENABLED_ATTR, isLinkingEnabled());
}
private void readSorting(IMemento memento) {
IMemento sorting = memento.getChild(SORTING_MEMENTO);
if(sorting != null) {
Boolean sorted = sorting.getBoolean(ALPHA_SORTED_ATTR);
this.alphaSorted = (sorted != null) && sorted.booleanValue();
}
}
private void writeSorting(IMemento memento) {
IMemento sorting = memento.getChild(SORTING_MEMENTO);
if(sorting == null) {
sorting = memento.createChild(SORTING_MEMENTO);
}
sorting.putBoolean(ALPHA_SORTED_ATTR, isAlphaSorted());
}
public void addListener(StateChangedListener listener) {
addListenerObject(listener);
}
public void removeListener(StateChangedListener listener) {
removeListenerObject(listener);
}
void fireStateChanged(int eventType) {
if(isListenerAttached()) {
StateChangedEvent event = new StateChangedEvent(this, eventType);
Object[] listeners = getListeners();
for(int i = 0; i < listeners.length; i++) {
try {
((StateChangedListener)listeners[i]).sharedStateChanged(event);
} catch (Exception e) {
Activator.log.error("Uncaught exception in shared state listener.", e);
}
}
}
}
//
// Nested types
//
static class StateChangedEvent extends EventObject {
public static final int LINKING_ENABLED = 1;
public static final int ALPHA_SORTED = 2;
public static final int CONTENT_EXTENSIONS = 3;
private static final long serialVersionUID = 1L;
private final int type;
StateChangedEvent(SharedModelExplorerState source, int type) {
super(source);
this.type = type;
}
@Override
public SharedModelExplorerState getSource() {
return (SharedModelExplorerState)super.getSource();
}
public int getEventType() {
return type;
}
}
/**
* Call-back interface for notification of changes in the shared Model Explorer state.
*/
static interface StateChangedListener extends EventListener {
void sharedStateChanged(StateChangedEvent event);
}
}
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