Android Open Source - pulltorefresh_library_with_Indexable_listView Google Style View Layout Factory

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License

The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2013 Naver Business Platform Corp.
 * //  w  w  w .  j a va 2  s .c  o  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.handmark.pulltorefresh.library;

import java.lang.reflect.Constructor;

import java.lang.reflect.InvocationTargetException;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.Log;
import android.view.View;

import com.handmark.pulltorefresh.configuration.xml.PullToRefreshXmlConfiguration;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Orientation;
import com.handmark.pulltorefresh.library.internal.DefaultGoogleStyleViewLayout;
import com.handmark.pulltorefresh.library.GoogleStyleViewLayout;
/**
 * Factory which creates google style view layouts 
 * <br />Google style view layouts must be listed in pulltorefresh.xml as "PullToRefresh/GoogleStyleViewLayouts/layout" nodes
 * @author Wonjun Kim
 */
class GoogleStyleViewLayoutFactory {

  private static final String LOG_TAG = GoogleStyleViewLayoutFactory.class
      .getSimpleName();
  /**
   * Create the class token matched by <b>{@code layoutCode}</b>
   * @param layoutCode Google style view layout code, which must be defined in pulltorefresh.xml 
   * @return Class token which is matched by {@code layoutCode}, or the class token of {@code RotateGoogleStyleViewLayout} instance if not
   */
  public static Class<? extends GoogleStyleViewLayout> createGoogleStyleViewLayoutClazzByLayoutCode(String layoutCode) {
    String clazzName = PullToRefreshXmlConfiguration.getInstance().getGoogleStyleViewLayoutClazzName(layoutCode);
    return createGoogleStyleViewLayoutClazz(clazzName);
  }
  /**
   * Create a {@code GoogleStyleViewLayout} instance matched by <b>{@code clazz} token</b> 
   * @param layoutCode Google style view layout code, which must be defined in pulltorefresh.xml
   * @param context 
   * @return {@code GoogleStyleViewLayout} instance if the class matched by {@code layoutCode} exists, or {@code RotateGoogleStyleViewLayout} instance if not  
   */
  @SuppressWarnings("unchecked")
  public static Class<? extends GoogleStyleViewLayout> createGoogleStyleViewLayoutClazz(
      String clazzName) {
    Class<? extends GoogleStyleViewLayout> googleStyleViewLayoutClazz = null;
    if ( clazzName == null ) {
      googleStyleViewLayoutClazz = DefaultGoogleStyleViewLayoutFactory.createGoogleStyleViewLayoutClazz(clazzName);
      return googleStyleViewLayoutClazz;
    }
    
    try {
      googleStyleViewLayoutClazz = (Class<GoogleStyleViewLayout>) Class.forName(clazzName);

    } catch (ClassNotFoundException e) {
      Log.e(LOG_TAG,"The google style view layout you have chosen class has not been found.", e);
      googleStyleViewLayoutClazz = DefaultGoogleStyleViewLayoutFactory.createGoogleStyleViewLayoutClazz(clazzName);
    } 

    return googleStyleViewLayoutClazz;
  }
  /**
   * Create a {@code GoogleStyleViewLayout} instance matched by <b>{@code layoutCode}</b> 
   * @param layoutCode Google style view layout code, which must be defined in pulltorefresh.xml
   * @param context 
   * @return {@code GoogleStyleViewLayout} instance if the class matched by {@code layoutCode} exists, or {@code DefaultGoogleStyleViewLayout} instance if not  
   */
  public static GoogleStyleViewLayout createGoogleStyleViewLayout(String layoutCode, Context context, TypedArray attrs) {
    Class<? extends GoogleStyleViewLayout> clazz = createGoogleStyleViewLayoutClazz(layoutCode);
    return createGoogleStyleViewLayout(clazz, context, attrs);
  }
  /**
   * Create a {@code GoogleStyleViewLayout} instance matched by <b>{@code clazz} token</b> 
   * @param layoutCode Google style view layout code, which must be defined in pulltorefresh.xml
   * @param context 
   * @return {@code GoogleStyleViewLayout} instance if the class matched by {@code layoutCode} exists, or {@code DefaultGoogleStyleViewLayout} instance if not  
   */
  public static GoogleStyleViewLayout createGoogleStyleViewLayout(
      Class<? extends GoogleStyleViewLayout> clazz, Context context, TypedArray attrs) {
    GoogleStyleViewLayout layout = null;
    // Prevent NullPointerException
    if ( clazz == null ) {
      Log.i(LOG_TAG, "The Class token of the GoogleStyleViewLayout is missing. Default google style view layout will be used.");
      clazz = DefaultGoogleStyleViewLayoutFactory.createGoogleStyleViewLayoutClazz("");
    }
    
    layout = tryNewInstance(clazz, context, attrs);

    // If trying to create new instance has failed,
    if (layout == null) {
      layout = DefaultGoogleStyleViewLayoutFactory.createGoogleStyleViewLayout(clazz, context, attrs);
    }

    layout.setVisibility(View.INVISIBLE);
    return layout;
  }
  private static GoogleStyleViewLayout tryNewInstance(
      Class<? extends GoogleStyleViewLayout> clazz, Context context, TypedArray attrs) {
    GoogleStyleViewLayout layout = null;
    try {
      Constructor<? extends GoogleStyleViewLayout> constructor = clazz
          .getConstructor(Context.class, TypedArray.class);
      layout = (GoogleStyleViewLayout) constructor.newInstance(context, attrs);

    } catch (IllegalArgumentException e) {
      Log.e(LOG_TAG, "The google style view layout has failed to be created. ", e);
    } catch (InvocationTargetException e) {
      Log.e(LOG_TAG, "The google style view layout has failed to be created. ", e);
    } catch (SecurityException e) {
      Log.e(LOG_TAG, "The google style view layout has failed to be created. ", e);
    } catch (NoSuchMethodException e) {
      Log.e(LOG_TAG, "The google style view layout has failed to be created. ", e);
    } catch (InstantiationException e) {
      Log.e(LOG_TAG, "The google style view layout has failed to be created. ", e);
    } catch (IllegalAccessException e) {
      Log.e(LOG_TAG, "The google style view layout has failed to be created. ", e);
    } catch (NullPointerException e) {
      Log.e(LOG_TAG, "The google style view layout has failed to be created. ", e);
    }
    return layout;
  }
  /**
   * Factory which creates a default google style view layout instance. This is used when {@code GoogleStyleViewLayoutFactory} fails to create a instance
   * @author Wonjun Kim
   *
   */
  private static class DefaultGoogleStyleViewLayoutFactory {
    /**
     * @param clazzName This class name is being ignored
     * @return Class token of {@code DefaultGoogleStyleViewLayout}
     */
    public static Class<? extends GoogleStyleViewLayout> createGoogleStyleViewLayoutClazz(
        String clazzName) {
      return DefaultGoogleStyleViewLayout.class;
    }
    /**
     * @param clazz Class token is being ignored.
     * @param context
     * @return {@code DefaultGoogleStyleViewLayout} instance
     */
    public static GoogleStyleViewLayout createGoogleStyleViewLayout(
        Class<? extends GoogleStyleViewLayout> clazz, Context context, TypedArray attrs) {

      return new DefaultGoogleStyleViewLayout(context, attrs);
    }

  }

}

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