/**
 * Copyright (c) 2012 Todoroo Inc
 *
 * See the file "LICENSE" for the full license governing this code.
 */
package com.commonsware.cwac.merge;

import java.util.List;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.SpinnerAdapter;

/**
 * Adapter that merges multiple child adapters into a single
 * contiguous whole to be consumed by a Spinner.
 * 
 * Adapters used as pieces within MergeSpinnerAdapter must
 * have view type IDs monotonically increasing from 0.
 * Ideally, adapters also have distinct ranges for their row
 * ids, as returned by getItemId().
 * 
 * All Adapters used as pieces within MergeSpinnerAdapter
 * must be properly-configured implementations of
 * SpinnerAdapter (e.g., ArrayAdapter, CursorAdapter).
 */
public class MergeSpinnerAdapter extends MergeAdapter {
  /**
   * Stock constructor, simply chaining to the superclass.
   */
  public MergeSpinnerAdapter() {
    super();
  }

  /*
   * Returns the drop-down View for a given position, by
   * iterating over the pieces. Assumes that all pieces are
   * implementations of SpinnerAdapter.
   * 
   * @see android.widget.BaseAdapter#getDropDownView(int,
   * android.view.View, android.view.ViewGroup)
   */
  public View getDropDownView(int position, View convertView,
                              ViewGroup parent) {
    for (ListAdapter piece : pieces) {
      int size=piece.getCount();

      if (position<size) {
        return(((SpinnerAdapter)piece).getDropDownView(position,
                                                       convertView,
                                                       parent));
      }

      position-=size;
    }

    return(null);
  }

  /**
   * Adds a new View to the roster of things to appear in
   * the aggregate list.
   * 
   * @param view
   *          Single view to add
   */
  public void addView(View view) {
    throw new RuntimeException("Not supported with MergeSpinnerAdapter");
  }

  /**
   * Adds a new View to the roster of things to appear in
   * the aggregate list.
   * 
   * @param view
   *          Single view to add
   * @param enabled
   *          false if views are disabled, true if enabled
   */
  public void addView(View view, boolean enabled) {
    throw new RuntimeException("Not supported with MergeSpinnerAdapter");
  }

  /**
   * Adds a list of views to the roster of things to appear
   * in the aggregate list.
   * 
   * @param views
   *          List of views to add
   */
  public void addViews(List<View> views) {
    throw new RuntimeException("Not supported with MergeSpinnerAdapter");
  }

  /**
   * Adds a list of views to the roster of things to appear
   * in the aggregate list.
   * 
   * @param views
   *          List of views to add
   * @param enabled
   *          false if views are disabled, true if enabled
   */
  public void addViews(List<View> views, boolean enabled) {
    throw new RuntimeException("Not supported with MergeSpinnerAdapter");
  }
}