PlaceCursorAdapter.java

package edu.vanderbilt.vm.guide.ui.adapter;

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteException;
import android.location.Location;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import edu.vanderbilt.vm.guide.R;
import edu.vanderbilt.vm.guide.db.GuideDBConstants;
import edu.vanderbilt.vm.guide.util.DBUtils;
import edu.vanderbilt.vm.guide.util.Geomancer;

public class PlaceCursorAdapter extends BaseAdapter {

    private final Cursor mCursor;

    private final Context mContext;

    private int mIdColIx;

    private int mNameColIx;

    private int mCatColIx;

    private int mLatColIx;

    private int mLngColIx;

    /**
     * Do not call this constructor.
     * 
     * @throws Exception
     */
    public PlaceCursorAdapter() throws Exception {
        throw new Exception("Do not call this constructor");
    }

    public PlaceCursorAdapter(Context context, Cursor cursor) {
        mContext = context;
        mCursor = cursor;

        mIdColIx = mCursor.getColumnIndex(GuideDBConstants.PlaceTable.ID_COL);
        if (mIdColIx == -1) {
            throw new SQLiteException("Cursor does not have an id column");
        }
        mNameColIx = mCursor.getColumnIndex(GuideDBConstants.PlaceTable.NAME_COL);
        if (mNameColIx == -1) {
            throw new SQLiteException("Cursor does not have a name column");
        }
        mCatColIx = mCursor.getColumnIndex(GuideDBConstants.PlaceTable.CATEGORY_COL);
        if (mCatColIx == -1) {
            throw new SQLiteException("Cursor does not have a category column");
        }
        mLatColIx = mCursor.getColumnIndex(GuideDBConstants.PlaceTable.LATITUDE_COL);
        if (mLatColIx == -1) {
            throw new SQLiteException("Cursor does not have a latitude column");
        }
        mLngColIx = mCursor.getColumnIndex(GuideDBConstants.PlaceTable.LONGITUDE_COL);
        if (mLngColIx == -1) {
            throw new SQLiteException("Cursor does not have a longitude column");
        }

    }

    public static String[] getExpectedProjection() {
        return new String[] {
                GuideDBConstants.PlaceTable.ID_COL, GuideDBConstants.PlaceTable.NAME_COL,
                GuideDBConstants.PlaceTable.CATEGORY_COL, GuideDBConstants.PlaceTable.LATITUDE_COL,
                GuideDBConstants.PlaceTable.LONGITUDE_COL
        };
    }

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

    @Override
    public Object getItem(int position) {
        checkPosition(position);
        mCursor.moveToPosition(position);
        return DBUtils.getPlaceFromCursor(mCursor);
    }

    @Override
    public long getItemId(int position) {
        checkPosition(position);
        mCursor.moveToPosition(position);
        return mCursor.getInt(mIdColIx);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        checkPosition(position);
        
        
        LinearLayout layout;
        if (convertView == null) {
            layout = (LinearLayout)LayoutInflater.from(mContext).inflate(R.layout.place_list_item,
                    null);
            layout.setTag(layout);
        } else {
            layout = (LinearLayout)convertView.getTag();
        }

        
        // no header
        layout.findViewById(R.id.placelist_item_header).setVisibility(View.GONE);
        
        
        mCursor.moveToPosition(position);
        ((TextView)layout.findViewById(R.id.placelist_item_title)).setText(mCursor
                .getString(mNameColIx));

        
        // TODO replace placeholder with categorical icon
        ((ImageView)layout.findViewById(R.id.placelist_item_thumbnail))
                .setImageResource(R.drawable.home);

        
        
        Location tmp = new Location("Temp");
        tmp.setLatitude(Double.parseDouble(mCursor.getString(mLatColIx)));
        tmp.setLongitude(Double.parseDouble(mCursor.getString(mLngColIx)));

        ((TextView)layout.findViewById(R.id.placelist_item_distance)).setText(Geomancer
                .getDistanceString(tmp));

        
        return layout;
    }

    private void checkPosition(int position) {
        if (position < 0 || position >= mCursor.getCount()) {
            throw new IndexOutOfBoundsException("Position " + position
                    + " is invalid for a cursor with " + getCount() + "rows.");
        }
    }

}