/*
 * 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;

import org.onosproject.ui.topo.PropertyPanel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Represents user interface topology view overlay.
 */
public class UiTopoOverlay {

    /**
     * Logger for this overlay.
     */
    protected final Logger log = LoggerFactory.getLogger(getClass());

    private final String id;

    private boolean isActive = false;

    /**
     * Creates a new user interface topology view overlay descriptor.
     *
     * @param id overlay identifier
     */
    public UiTopoOverlay(String id) {
        this.id = id;
    }

    /**
     * Returns the identifier for this overlay.
     *
     * @return the identifier
     */
    public String id() {
        return id;
    }

    /**
     * Callback invoked to initialize this overlay, soon after creation.
     * This default implementation does nothing.
     */
    public void init() {
    }

    /**
     * Callback invoked when this overlay is activated.
     */
    public void activate() {
        isActive = true;
    }

    /**
     * Callback invoked when this overlay is deactivated.
     */
    public void deactivate() {
        isActive = false;
    }

    /**
     * Returns true if this overlay is currently active.
     *
     * @return true if overlay active
     */
    public boolean isActive() {
        return isActive;
    }

    /**
     * Callback invoked to destroy this instance by cleaning up any
     * internal state ready for garbage collection.
     * This default implementation holds no state and does nothing.
     */
    public void destroy() {
    }

    /**
     * Callback to modify the contents of the summary panel.
     * This default implementation does nothing.
     *
     * @param pp property panel model of summary data
     */
    public void modifySummary(PropertyPanel pp) {
    }

    /**
     * Callback to modify the contents of the details panel for
     * a selected device.
     * This default implementation does nothing.
     *
     * @param pp property panel model of summary data
     */
    public void modifyDeviceDetails(PropertyPanel pp) {
    }

    /**
     * Callback to modify the contents of the details panel for
     * a selected host.
     * This default implementation does nothing.
     *
     * @param pp property panel model of summary data
     */
    public void modifyHostDetails(PropertyPanel pp) {
    }
}