/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * 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 android.widget;

import android.annotation.IdRes;
import android.annotation.LayoutRes;
import android.content.Context;
import android.content.res.Resources;
import android.net.Uri;
import android.view.ContextThemeWrapper;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

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

An easy adapter to map static data to views defined in an XML file. You can specify the data backing the list as an ArrayList of Maps. Each entry in the ArrayList corresponds to one row in the list. The Maps contain the data for each row. You also specify an XML file that defines the views used to display the row, and a mapping from keys in the Map to specific views. Binding data to views occurs in two phases. First, if a ViewBinder is available, ViewBinder.setViewValue(View, Object, String) is invoked. If the returned value is true, binding has occurred. If the returned value is false, the following views are then tried in order: 

 A view that implements Checkable (e.g. CheckBox).  The expected bind value is a boolean.
 TextView. The expected bind value is a string and setViewText(TextView, String) is invoked. 
 ImageView. The expected bind value is a resource id or a string and setViewImage(ImageView, int) or setViewImage(ImageView, String) is invoked. 
 If no appropriate binding can be found, an IllegalStateException is thrown. /**
 * An easy adapter to map static data to views defined in an XML file. You can specify the data
 * backing the list as an ArrayList of Maps. Each entry in the ArrayList corresponds to one row
 * in the list. The Maps contain the data for each row. You also specify an XML file that
 * defines the views used to display the row, and a mapping from keys in the Map to specific
 * views.
 *
 * Binding data to views occurs in two phases. First, if a
 * {@link android.widget.SimpleAdapter.ViewBinder} is available,
 * {@link ViewBinder#setViewValue(android.view.View, Object, String)}
 * is invoked. If the returned value is true, binding has occurred.
 * If the returned value is false, the following views are then tried in order:
 * <ul>
 * <li> A view that implements Checkable (e.g. CheckBox).  The expected bind value is a boolean.
 * <li> TextView.  The expected bind value is a string and {@link #setViewText(TextView, String)}
 * is invoked.
 * <li> ImageView. The expected bind value is a resource id or a string and
 * {@link #setViewImage(ImageView, int)} or {@link #setViewImage(ImageView, String)} is invoked.
 * </ul>
 * If no appropriate binding can be found, an {@link IllegalStateException} is thrown.
 */
public class SimpleAdapter extends BaseAdapter implements Filterable, ThemedSpinnerAdapter {
    private final LayoutInflater mInflater;

    private int[] mTo;
    private String[] mFrom;
    private ViewBinder mViewBinder;

    private List<? extends Map<String, ?>> mData;

    private int mResource;
    private int mDropDownResource;

    
Layout inflater used for getDropDownView(int, View, ViewGroup). /** Layout inflater used for {@link #getDropDownView(int, View, ViewGroup)}. */
    private LayoutInflater mDropDownInflater;

    private SimpleFilter mFilter;
    private ArrayList<Map<String, ?>> mUnfilteredData;

    
Constructor
Params:
context – The context where the View associated with this SimpleAdapter is running
data – A List of Maps. Each entry in the List corresponds to one row in the list. The
       Maps contain the data for each row, and should include all the entries specified in
       "from"
resource – Resource identifier of a view layout that defines the views for this list
       item. The layout file should include at least those named views defined in "to"
from – A list of column names that will be added to the Map associated with each
       item.
to – The views that should display column in the "from" parameter. These should all be
       TextViews. The first N views in this list are given the values of the first N columns
       in the from parameter./**
     * Constructor
     *
     * @param context The context where the View associated with this SimpleAdapter is running
     * @param data A List of Maps. Each entry in the List corresponds to one row in the list. The
     *        Maps contain the data for each row, and should include all the entries specified in
     *        "from"
     * @param resource Resource identifier of a view layout that defines the views for this list
     *        item. The layout file should include at least those named views defined in "to"
     * @param from A list of column names that will be added to the Map associated with each
     *        item.
     * @param to The views that should display column in the "from" parameter. These should all be
     *        TextViews. The first N views in this list are given the values of the first N columns
     *        in the from parameter.
     */
    public SimpleAdapter(Context context, List<? extends Map<String, ?>> data,
            @LayoutRes int resource, String[] from, @IdRes int[] to) {
        mData = data;
        mResource = mDropDownResource = resource;
        mFrom = from;
        mTo = to;
        mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    
See Also:
getCount.getCount()/**
     * @see android.widget.Adapter#getCount()
     */
    public int getCount() {
        return mData.size();
    }

    
See Also:
getItem.getItem(int)/**
     * @see android.widget.Adapter#getItem(int)
     */
    public Object getItem(int position) {
        return mData.get(position);
    }

    
See Also:
getItemId.getItemId(int)/**
     * @see android.widget.Adapter#getItemId(int)
     */
    public long getItemId(int position) {
        return position;
    }

    
See Also:
getView.getView(int, View, ViewGroup)/**
     * @see android.widget.Adapter#getView(int, View, ViewGroup)
     */
    public View getView(int position, View convertView, ViewGroup parent) {
        return createViewFromResource(mInflater, position, convertView, parent, mResource);
    }

    private View createViewFromResource(LayoutInflater inflater, int position, View convertView,
            ViewGroup parent, int resource) {
        View v;
        if (convertView == null) {
            v = inflater.inflate(resource, parent, false);
        } else {
            v = convertView;
        }

        bindView(position, v);

        return v;
    }

    
Sets the layout resource to create the drop down views.
Params:
resource – the layout resource defining the drop down views
See Also:
getDropDownView(int, View, ViewGroup)/**
     * <p>Sets the layout resource to create the drop down views.</p>
     *
     * @param resource the layout resource defining the drop down views
     * @see #getDropDownView(int, android.view.View, android.view.ViewGroup)
     */
    public void setDropDownViewResource(int resource) {
        mDropDownResource = resource;
    }

    
Sets the Theme against which drop-down views are inflated. 
 By default, drop-down views are inflated against the theme of the Context passed to the adapter's constructor. 
Params:
theme – the theme against which to inflate drop-down views or null to use the theme from the adapter's context
See Also:
getDropDownView(int, View, ViewGroup)/**
     * Sets the {@link android.content.res.Resources.Theme} against which drop-down views are
     * inflated.
     * <p>
     * By default, drop-down views are inflated against the theme of the
     * {@link Context} passed to the adapter's constructor.
     *
     * @param theme the theme against which to inflate drop-down views or
     *              {@code null} to use the theme from the adapter's context
     * @see #getDropDownView(int, View, ViewGroup)
     */
    @Override
    public void setDropDownViewTheme(Resources.Theme theme) {
        if (theme == null) {
            mDropDownInflater = null;
        } else if (theme == mInflater.getContext().getTheme()) {
            mDropDownInflater = mInflater;
        } else {
            final Context context = new ContextThemeWrapper(mInflater.getContext(), theme);
            mDropDownInflater = LayoutInflater.from(context);
        }
    }

    @Override
    public Resources.Theme getDropDownViewTheme() {
        return mDropDownInflater == null ? null : mDropDownInflater.getContext().getTheme();
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        final LayoutInflater inflater = mDropDownInflater == null ? mInflater : mDropDownInflater;
        return createViewFromResource(inflater, position, convertView, parent, mDropDownResource);
    }

    private void bindView(int position, View view) {
        final Map dataSet = mData.get(position);
        if (dataSet == null) {
            return;
        }

        final ViewBinder binder = mViewBinder;
        final String[] from = mFrom;
        final int[] to = mTo;
        final int count = to.length;

        for (int i = 0; i < count; i++) {
            final View v = view.findViewById(to[i]);
            if (v != null) {
                final Object data = dataSet.get(from[i]);
                String text = data == null ? "" : data.toString();
                if (text == null) {
                    text = "";
                }

                boolean bound = false;
                if (binder != null) {
                    bound = binder.setViewValue(v, data, text);
                }

                if (!bound) {
                    if (v instanceof Checkable) {
                        if (data instanceof Boolean) {
                            ((Checkable) v).setChecked((Boolean) data);
                        } else if (v instanceof TextView) {
                            // Note: keep the instanceof TextView check at the bottom of these
                            // ifs since a lot of views are TextViews (e.g. CheckBoxes).
                            setViewText((TextView) v, text);
                        } else {
                            throw new IllegalStateException(v.getClass().getName() +
                                    " should be bound to a Boolean, not a " +
                                    (data == null ? "<unknown type>" : data.getClass()));
                        }
                    } else if (v instanceof TextView) {
                        // Note: keep the instanceof TextView check at the bottom of these
                        // ifs since a lot of views are TextViews (e.g. CheckBoxes).
                        setViewText((TextView) v, text);
                    } else if (v instanceof ImageView) {
                        if (data instanceof Integer) {
                            setViewImage((ImageView) v, (Integer) data);
                        } else {
                            setViewImage((ImageView) v, text);
                        }
                    } else {
                        throw new IllegalStateException(v.getClass().getName() + " is not a " +
                                " view that can be bounds by this SimpleAdapter");
                    }
                }
            }
        }
    }

    
Returns the ViewBinder used to bind data to views. 
See Also:
setViewBinder(ViewBinder)
Returns:
a ViewBinder or null if the binder does not exist/**
     * Returns the {@link ViewBinder} used to bind data to views.
     *
     * @return a ViewBinder or null if the binder does not exist
     *
     * @see #setViewBinder(android.widget.SimpleAdapter.ViewBinder)
     */
    public ViewBinder getViewBinder() {
        return mViewBinder;
    }

    
Sets the binder used to bind data to views.
Params:
viewBinder – the binder used to bind data to views, can be null to
       remove the existing binder
See Also:
getViewBinder()/**
     * Sets the binder used to bind data to views.
     *
     * @param viewBinder the binder used to bind data to views, can be null to
     *        remove the existing binder
     *
     * @see #getViewBinder()
     */
    public void setViewBinder(ViewBinder viewBinder) {
        mViewBinder = viewBinder;
    }

    
Called by bindView() to set the image for an ImageView but only if there is no existing ViewBinder or if the existing ViewBinder cannot handle binding to an ImageView. This method is called instead of setViewImage(ImageView, String) if the supplied data is an int or Integer. 
Params:
v – ImageView to receive an image
value – the value retrieved from the data set
See Also:
setViewImage(ImageView, String)/**
     * Called by bindView() to set the image for an ImageView but only if
     * there is no existing ViewBinder or if the existing ViewBinder cannot
     * handle binding to an ImageView.
     *
     * This method is called instead of {@link #setViewImage(ImageView, String)}
     * if the supplied data is an int or Integer.
     *
     * @param v ImageView to receive an image
     * @param value the value retrieved from the data set
     *
     * @see #setViewImage(ImageView, String)
     */
    public void setViewImage(ImageView v, int value) {
        v.setImageResource(value);
    }

    
Called by bindView() to set the image for an ImageView but only if there is no existing ViewBinder or if the existing ViewBinder cannot handle binding to an ImageView. By default, the value will be treated as an image resource. If the value cannot be used as an image resource, the value is used as an image Uri. This method is called instead of setViewImage(ImageView, int) if the supplied data is not an int or Integer. 
Params:
v – ImageView to receive an image
value – the value retrieved from the data set
See Also:
setViewImage(ImageView, int)/**
     * Called by bindView() to set the image for an ImageView but only if
     * there is no existing ViewBinder or if the existing ViewBinder cannot
     * handle binding to an ImageView.
     *
     * By default, the value will be treated as an image resource. If the
     * value cannot be used as an image resource, the value is used as an
     * image Uri.
     *
     * This method is called instead of {@link #setViewImage(ImageView, int)}
     * if the supplied data is not an int or Integer.
     *
     * @param v ImageView to receive an image
     * @param value the value retrieved from the data set
     *
     * @see #setViewImage(ImageView, int)
     */
    public void setViewImage(ImageView v, String value) {
        try {
            v.setImageResource(Integer.parseInt(value));
        } catch (NumberFormatException nfe) {
            v.setImageURI(Uri.parse(value));
        }
    }

    
Called by bindView() to set the text for a TextView but only if
there is no existing ViewBinder or if the existing ViewBinder cannot
handle binding to a TextView.
Params:
v – TextView to receive text
text – the text to be set for the TextView/**
     * Called by bindView() to set the text for a TextView but only if
     * there is no existing ViewBinder or if the existing ViewBinder cannot
     * handle binding to a TextView.
     *
     * @param v TextView to receive text
     * @param text the text to be set for the TextView
     */
    public void setViewText(TextView v, String text) {
        v.setText(text);
    }

    public Filter getFilter() {
        if (mFilter == null) {
            mFilter = new SimpleFilter();
        }
        return mFilter;
    }

    
This class can be used by external clients of SimpleAdapter to bind
values to views.
You should use this class to bind values to views that are not
directly supported by SimpleAdapter or to change the way binding
occurs for views supported by SimpleAdapter.
See Also:
setViewImage.setViewImage(ImageView, int)
SimpleAdapter.setViewImage(ImageView, String)
SimpleAdapter.setViewText(TextView, String)/**
     * This class can be used by external clients of SimpleAdapter to bind
     * values to views.
     *
     * You should use this class to bind values to views that are not
     * directly supported by SimpleAdapter or to change the way binding
     * occurs for views supported by SimpleAdapter.
     *
     * @see SimpleAdapter#setViewImage(ImageView, int)
     * @see SimpleAdapter#setViewImage(ImageView, String)
     * @see SimpleAdapter#setViewText(TextView, String)
     */
    public static interface ViewBinder {
        
Binds the specified data to the specified view.
When binding is handled by this ViewBinder, this method must return true.
If this method returns false, SimpleAdapter will attempts to handle
the binding on its own.
Params:
view – the view to bind the data to
data – the data to bind to the view
textRepresentation – a safe String representation of the supplied data:
       it is either the result of data.toString() or an empty String but it
       is never null
Returns:
true if the data was bound to the view, false otherwise/**
         * Binds the specified data to the specified view.
         *
         * When binding is handled by this ViewBinder, this method must return true.
         * If this method returns false, SimpleAdapter will attempts to handle
         * the binding on its own.
         *
         * @param view the view to bind the data to
         * @param data the data to bind to the view
         * @param textRepresentation a safe String representation of the supplied data:
         *        it is either the result of data.toString() or an empty String but it
         *        is never null
         *
         * @return true if the data was bound to the view, false otherwise
         */
        boolean setViewValue(View view, Object data, String textRepresentation);
    }

    
An array filters constrains the content of the array adapter with
a prefix. Each item that does not start with the supplied prefix
is removed from the list.
/**
     * <p>An array filters constrains the content of the array adapter with
     * a prefix. Each item that does not start with the supplied prefix
     * is removed from the list.</p>
     */
    private class SimpleFilter extends Filter {

        @Override
        protected FilterResults performFiltering(CharSequence prefix) {
            FilterResults results = new FilterResults();

            if (mUnfilteredData == null) {
                mUnfilteredData = new ArrayList<Map<String, ?>>(mData);
            }

            if (prefix == null || prefix.length() == 0) {
                ArrayList<Map<String, ?>> list = mUnfilteredData;
                results.values = list;
                results.count = list.size();
            } else {
                String prefixString = prefix.toString().toLowerCase();

                ArrayList<Map<String, ?>> unfilteredValues = mUnfilteredData;
                int count = unfilteredValues.size();

                ArrayList<Map<String, ?>> newValues = new ArrayList<Map<String, ?>>(count);

                for (int i = 0; i < count; i++) {
                    Map<String, ?> h = unfilteredValues.get(i);
                    if (h != null) {

                        int len = mTo.length;

                        for (int j=0; j<len; j++) {
                            String str =  (String)h.get(mFrom[j]);

                            String[] words = str.split(" ");
                            int wordCount = words.length;

                            for (int k = 0; k < wordCount; k++) {
                                String word = words[k];

                                if (word.toLowerCase().startsWith(prefixString)) {
                                    newValues.add(h);
                                    break;
                                }
                            }
                        }
                    }
                }

                results.values = newValues;
                results.count = newValues.size();
            }

            return results;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            //noinspection unchecked
            mData = (List<Map<String, ?>>) results.values;
            if (results.count > 0) {
                notifyDataSetChanged();
            } else {
                notifyDataSetInvalidated();
            }
        }
    }
}