Android Open Source - Renderers Renderer Adapter

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2014 Pedro Vicente Gmez Snchez.
 *//from  w  w  w  .  ja  v  a  2s .co m
 * 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 com.pedrogomez.renderers;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import com.pedrogomez.renderers.exception.NullRendererBuiltException;
import java.util.Collection;

/**
 * BaseAdapter created to work RendererBuilders and Renderers. Other adapters have to use this one
 * to create new lists.
 * <p/>
 * This class is the heart of this library. It's used to avoid the library users declare a new
 * renderer each time they have to implement a new ListView.
 * <p/>
 * RendererAdapter<T> has to be constructed with a LayoutInflater to inflate views, one
 * RendererBuilder to provide Renderer to RendererAdapterdapter and one AdapteeCollection to
 * provide the elements to render.
 *
 * @author Pedro Vicente Gmez Snchez.
 */
public class RendererAdapter<T> extends BaseAdapter {

  private LayoutInflater layoutInflater;
  private RendererBuilder<T> rendererBuilder;
  private AdapteeCollection<T> collection;

  public RendererAdapter(LayoutInflater layoutInflater, RendererBuilder rendererBuilder,
      AdapteeCollection<T> collection) {
    this.layoutInflater = layoutInflater;
    this.rendererBuilder = rendererBuilder;
    this.collection = collection;
  }

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

  @Override public T getItem(int position) {
    return collection.get(position);
  }

  @Override public long getItemId(int position) {
    return position;
  }

  /**
   * Main method of RendererAdapter. This method has the responsibility of update renderer builder
   * values and create or recycle a new rendere. Once the renderer has been obtained the
   * RendereBuilder will call the render method in the renderer and will return the renderer root
   * view to the ListView.
   * <p/>
   * If rendererBuilder returns a null renderer this method will throw a
   * NullRendererBuiltException.
   *
   * @param position to render.
   * @param convertView to use to recycle.
   * @param parent used to inflate views.
   * @return view rendered.
   */
  @Override public View getView(int position, View convertView, ViewGroup parent) {
    T content = getItem(position);
    rendererBuilder.withContent(content);
    rendererBuilder.withConvertView(convertView);
    rendererBuilder.withParent(parent);
    rendererBuilder.withLayoutInflater(layoutInflater);
    Renderer<T> renderer = rendererBuilder.build();
    if (renderer == null) {
      throw new NullRendererBuiltException("RendererBuilder have to return a not null renderer");
    }
    updateRendererExtraValues(content, renderer, position);
    renderer.render();
    return renderer.getRootView();
  }

  /**
   * Indicate to the ListView the type of renderer used to one position using a numeric value.
   *
   * @param position to analyze.
   * @return the id associated to the renderer used to render the content at position position.
   */
  @Override public int getItemViewType(int position) {
    T content = getItem(position);
    return rendererBuilder.getItemViewType(content);
  }

  /**
   * Indicate to the ListView the number of different renderers are the RendererBuilder to use.
   *
   * @return amount of different renderers.
   */
  @Override public int getViewTypeCount() {
    return rendererBuilder.getViewTypeCount();
  }

  /**
   * Add an element to the AdapteeCollection<T>.
   *
   * @param element to add.
   */
  public void add(T element) {
    collection.add(element);
  }

  /**
   * Remove an element from the AdapteeCollection<T>.
   *
   * @param element to remove.
   */
  public void remove(T element) {
    collection.remove(element);
  }

  /**
   * Add a Collection<T> of elements to the AdapteeCollection.
   *
   * @param elements to add.
   */
  public void addAll(Collection<T> elements) {
    collection.addAll(elements);
  }

  /**
   * Remove a Collection<T> of elements to the AdapteeCollection.
   *
   * @param elements to remove.
   */
  public void removeAll(Collection<T> elements) {
    collection.removeAll(elements);
  }

  /**
   * Remove all elements inside the AdapteeCollection.
   */
  public void clear() {
    collection.clear();
  }

  /**
   * Allows the client code to access the AdapteeCollection<T> from subtypes of RendererAdapter.
   *
   * @return collection used in the adapter as the adaptee class.
   */
  protected AdapteeCollection<T> getCollection() {
    return collection;
  }

  /**
   * Empty implementation created to allow the client code to extend this class without override
   * getView method.
   * This method is called before render the renderer and can be used in RendererAdapter extension
   * to add extra info to the renderer created.
   *
   * @param content to be rendered.
   * @param renderer to be used to paint the content.
   * @param position of the content.
   */
  protected void updateRendererExtraValues(T content, Renderer<T> renderer, int position) {
    //Empty implementation
  }
}

Java Source Code List

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