MissionSelection.java

package org.droidplanner.android.proxy.mission;

import org.droidplanner.android.proxy.mission.item.MissionItemProxy;

import java.util.ArrayList;
import java.util.List;

public class MissionSelection {
	/**
	 * Classes interested in getting selection update should implement this
	 * interface.
	 */
	public interface OnSelectionUpdateListener {
		void onSelectionUpdate(List<MissionItemProxy> selected);
	}

	/**
	 * Stores the selected mission items renders.
	 */
	public final List<MissionItemProxy> mSelectedItems = new ArrayList<>();

	/**
	 * Stores the list of selection update listeners.
	 */
	public List<MissionSelection.OnSelectionUpdateListener> mSelectionsListeners = new ArrayList<>();

	/**
	 * Removes the given mission item render from the selected list.
	 * 
	 * @param item
	 *            mission item render to remove from the selected list
	 */
	public void removeItemFromSelection(MissionItemProxy item) {
		mSelectedItems.remove(item);
		notifySelectionUpdate();
	}

    /**
     * Removes the mission items in the given list from the selected list.
     * @param itemList list of mission items to remove from the selected list.
     */
    public void removeItemsFromSelection(List<MissionItemProxy> itemList){
        if(itemList == null || itemList.isEmpty()){
            return;
        }

        for(MissionItemProxy item : itemList){
            mSelectedItems.remove(item);
        }
        notifySelectionUpdate();
    }

	/**
	 * Selects only the given mission items renders. TODO: check the mission
	 * items renders belong to this mission render
	 * 
	 * @param items
	 *            list of mission items renders to select.
	 */
	public void setSelectionTo(List<MissionItemProxy> items) {
		mSelectedItems.clear();
		mSelectedItems.addAll(items);
		notifySelectionUpdate();
	}

	/**
	 * Selects only the given mission item render. TODO: check the mission item
	 * render belongs to this mission render
	 * 
	 * @param item
	 *            mission item render to select.
	 */
	public void setSelectionTo(MissionItemProxy item) {
		mSelectedItems.clear();
		mSelectedItems.add(item);
		notifySelectionUpdate();
	}

	/**
	 * Adds the given mission item render to the selected list. TODO: check the
	 * mission item render belongs to this mission render
	 * 
	 * @param item
	 *            mission item render to add to the selected list.
	 */
	public void addToSelection(MissionItemProxy item) {
		mSelectedItems.add(item);
		notifySelectionUpdate();
	}

	/**
	 * Selects the given list of mission items renders TODO: check if the given
	 * mission items renders belong to this mission render
	 * 
	 * @param items
	 *            list of mission items renders to select.
	 */
	public void addToSelection(List<MissionItemProxy> items) {
		mSelectedItems.addAll(items);
		notifySelectionUpdate();
	}

	/**
	 * Checks if the passed mission item render is selected.
	 * 
	 * @param item
	 *            mission item render to check for selection
	 * @return true if selected
	 */
	public boolean selectionContains(MissionItemProxy item) {
		return mSelectedItems.contains(item);
	}

	/**
	 * @return the list of selected mission items renders
	 */
	public List<MissionItemProxy> getSelected() {
		return mSelectedItems;
	}

	/**
	 * Deselects all mission items renders
	 */
	public void clearSelection() {
		if(!mSelectedItems.isEmpty()) {
			mSelectedItems.clear();
			notifySelectionUpdate();
		}
	}

	public void notifySelectionUpdate() {
		for (MissionSelection.OnSelectionUpdateListener listener : mSelectionsListeners)
			listener.onSelectionUpdate(mSelectedItems);
	}

	/**
	 * Adds given argument to the list of selection update listeners.
	 * 
	 * @param listener
	 */
	public void addSelectionUpdateListener(OnSelectionUpdateListener listener) {
		mSelectionsListeners.add(listener);
	}

	/**
	 * Removes given argument from the list of selection update listeners.
	 * 
	 * @param listener
	 */
	public void removeSelectionUpdateListener(MissionSelection.OnSelectionUpdateListener listener) {
		mSelectionsListeners.remove(listener);
	}
}