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/*
* Copyright 2015 Open Networking Laboratory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.onosproject.ui.impl;
import org.onosproject.ui.UiTopoOverlay;
import java.util.HashMap;
import java.util.Map;
import static com.google.common.base.Strings.isNullOrEmpty;
/**
* A cache of {@link org.onosproject.ui.UiTopoOverlay}'s that were registered
* at the time the UI connection was established.
*/
public class TopoOverlayCache {
private static final String EMPTY = "";
private static final UiTopoOverlay NONE = new NullOverlay();
private final Map<String, UiTopoOverlay> overlays = new HashMap<>();
private UiTopoOverlay current = NONE;
public TopoOverlayCache() {
overlays.put(null, NONE);
}
/**
* Adds a topology overlay to the cache.
*
* @param overlay a topology overlay
*/
public void add(UiTopoOverlay overlay) {
overlays.put(overlay.id(), overlay);
}
/**
* Invoked when the cache is no longer needed.
*/
public void destroy() {
overlays.clear();
}
/**
* Switching currently selected overlay.
*
* @param deact identity of overlay to deactivate
* @param act identity of overlay to activate
*/
public void switchOverlay(String deact, String act) {
UiTopoOverlay toDeactivate = getOverlay(deact);
UiTopoOverlay toActivate = getOverlay(act);
toDeactivate.deactivate();
current = toActivate;
current.activate();
}
private UiTopoOverlay getOverlay(String id) {
return isNullOrEmpty(id) ? NONE : overlays.get(id);
}
/**
* Returns the current overlay instance.
* Note that this method always returns a reference; when there is no
* overlay selected the "NULL" overlay instance is returned.
*
* @return the current overlay
*/
public UiTopoOverlay currentOverlay() {
return current;
}
/**
* Returns the number of overlays in the cache. Remember that this
* includes the "NULL" overlay, representing "no overlay selected".
*
* @return number of overlays
*/
public int size() {
return overlays.size();
}
/**
* Returns true if the identifier of the currently active overlay
* matches the given parameter.
*
* @param overlayId overlay identifier
* @return true if this matches the ID of currently active overlay
*/
public boolean isActive(String overlayId) {
return currentOverlay().id().equals(overlayId);
}
// overlay instance representing "no overlay selected"
private static class NullOverlay extends UiTopoOverlay {
public NullOverlay() {
super(EMPTY);
}
}
}
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