Android Open Source - InMemoryDb In Memory Filtered Adapter

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License

The source code is released under:

Apache License

Java Source Code

package org.gawst.asyncdb.adapter;
//from w  w  w  .j  a  v a  2  s .  c om
import java.util.List;

import android.content.Context;
import android.support.annotation.LayoutRes;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

/**
 * A {@link android.widget.ListAdapter ListAdapter} that only shows a subset of elements using the {@link org.gawst.asyncdb.adapter.InMemoryFilteredAdapter.InMemoryFilter}
 * @see org.gawst.asyncdb.adapter.InMemoryFilteredListAdapter
 * @see org.gawst.asyncdb.adapter.InMemoryFilteredTreeAdapter
 *
 * @author Created by robUx4 on 08/01/2015.
 */
public class InMemoryFilteredAdapter<E> extends BaseAdapter {

  protected final LayoutInflater mInflater;
  @LayoutRes
  protected final int layoutId;
  @Nullable
  protected final InMemoryFilter<E> filter;
  @NonNull
  private List<E> mData;
  private UIHandler uiHandler;

  public InMemoryFilteredAdapter(@NonNull Context context, @NonNull List<E> initialData, @LayoutRes int layoutResourceId, @Nullable InMemoryFilter<E> filter) {
    this.mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    this.layoutId = layoutResourceId;
    this.filter = filter;
    mData = initialData;
  }

  @Override
  public int getCount() {
    return mData.size();
  }

  @Override
  public E getItem(int position) {
    return mData.get(position);
  }

  @Override
  public boolean hasStableIds() {
    return true;
  }

  @Override
  public long getItemId(int position) {
    if (position<mData.size())
      return mData.get(position).hashCode();
    return -1;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    if (convertView==null)
      convertView = mInflater.inflate(layoutId, parent, false);

    TextView vt = (TextView) convertView.findViewById(android.R.id.text1);
    vt.setText(mData.get(position).toString());

    return convertView;
  }

  /**
   * Helper function to filter the data from the {@link org.gawst.asyncdb.adapter.InMemoryFilteredAdapter.InMemoryFilter.InMemoryFilterable} source
   * @param source The data source.
   * @param filter The filter to apply to the source. May be {@code null}.
   * @param <E> Type of elements in the source.
   * @return A filtered read-only {@link List} of elements coming from the source.
   */
  protected static <E> List<E> getFilteredData(@NonNull InMemoryFilter.InMemoryFilterable<E> source, @Nullable InMemoryFilter<E> filter) {
    if (null == filter)
      return source.getListCopy();
    else
      return filter.getFilteredData(source.getListCopy());
  }

  protected void setFilteredData(final List<E> filteredData) {
    Runnable runner = new Runnable() {
      @Override
      public void run() {
        mData = filteredData;
        notifyDataSetChanged();
      }
    };

    if (null==uiHandler)
      uiHandler = new UIHandler();
    uiHandler.runOnUiThread(runner);
  }

  /**
   * Interface to filter the whole data stored in an {@link org.gawst.asyncdb.AsynchronousDbHelper}
   */
  public static interface InMemoryFilter<E> {

    /**
     * Describes a data source that can produce a {@link java.util.List} object from its data.
     *
     * @param <E> Type of elements in the generated {@link java.util.List}.
     */
    public interface InMemoryFilterable<E> {
      /**
       * @return A read-only {@link java.util.List} version of the source data.
       */
      List<E> getListCopy();
    }

    /**
     * Filter data coming from a {@link org.gawst.asyncdb.adapter.InMemoryFilteredAdapter.InMemoryFilter.InMemoryFilterable InMemoryFilterable} source
     * @param data List of elements to filter.
     * @return Filtered List of elements.
     */
    @NonNull
    List<E> getFilteredData(List<E> data);
  }
}

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