content: /*
   * Copyright (C) 2015 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 com.android.setupwizardlib.items;
  
  import android.content.Context;
  import android.content.res.TypedArray;
  import android.util.AttributeSet;
  import android.util.Log;
  import com.android.setupwizardlib.R;
  import java.util.ArrayList;
  
  /** An abstract item hierarchy; provides default implementation for ID and observers. */
  public abstract class AbstractItemHierarchy implements ItemHierarchy {
  
    /* static section */
  
    private static final String TAG = "AbstractItemHierarchy";
  
    /* non-static section */
  
    private final ArrayList<Observer> observers = new ArrayList<>();
    private int id = 0;
  
    public AbstractItemHierarchy() {}
  
    public AbstractItemHierarchy(Context context, AttributeSet attrs) {
      TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SuwAbstractItem);
      id = a.getResourceId(R.styleable.SuwAbstractItem_android_id, 0);
      a.recycle();
    }
  
    public void setId(int id) {
      this.id = id;
    }
  
    public int getId() {
      return id;
    }
  
    public int getViewId() {
      return getId();
    }
  
    @Override
    public void registerObserver(Observer observer) {
      observers.add(observer);
    }
  
    @Override
    public void unregisterObserver(Observer observer) {
      observers.remove(observer);
    }
  
    /** @see Observer#onChanged(ItemHierarchy) */
    public void notifyChanged() {
      for (Observer observer : observers) {
        observer.onChanged(this);
      }
    }
  
    /** @see Observer#onItemRangeChanged(ItemHierarchy, int, int) */
    public void notifyItemRangeChanged(int position, int itemCount) {
      if (position < 0) {
        Log.w(TAG, "notifyItemRangeChanged: Invalid position=" + position);
        return;
      }
      if (itemCount < 0) {
        Log.w(TAG, "notifyItemRangeChanged: Invalid itemCount=" + itemCount);
        return;
      }
  
      for (Observer observer : observers) {
        observer.onItemRangeChanged(this, position, itemCount);
      }
    }
  
    /** @see Observer#onItemRangeInserted(ItemHierarchy, int, int) */
    public void notifyItemRangeInserted(int position, int itemCount) {
      if (position < 0) {
        Log.w(TAG, "notifyItemRangeInserted: Invalid position=" + position);
        return;
      }
      if (itemCount < 0) {
        Log.w(TAG, "notifyItemRangeInserted: Invalid itemCount=" + itemCount);
        return;
      }
  
      for (Observer observer : observers) {
        observer.onItemRangeInserted(this, position, itemCount);
      }
    }
  
    /** @see Observer#onItemRangeMoved(ItemHierarchy, int, int, int) */
    public void notifyItemRangeMoved(int fromPosition, int toPosition, int itemCount) {
      if (fromPosition < 0) {
        Log.w(TAG, "notifyItemRangeMoved: Invalid fromPosition=" + fromPosition);
        return;
      }
      if (toPosition < 0) {
        Log.w(TAG, "notifyItemRangeMoved: Invalid toPosition=" + toPosition);
        return;
      }
      if (itemCount < 0) {
        Log.w(TAG, "notifyItemRangeMoved: Invalid itemCount=" + itemCount);
        return;
      }
  
      for (Observer observer : observers) {
        observer.onItemRangeMoved(this, fromPosition, toPosition, itemCount);
      }
    }
  
    /** @see Observer#onItemRangeRemoved(ItemHierarchy, int, int) */
    public void notifyItemRangeRemoved(int position, int itemCount) {
      if (position < 0) {
        Log.w(TAG, "notifyItemRangeInserted: Invalid position=" + position);
        return;
      }
      if (itemCount < 0) {
        Log.w(TAG, "notifyItemRangeInserted: Invalid itemCount=" + itemCount);
        return;
      }
  
      for (Observer observer : observers) {
        observer.onItemRangeRemoved(this, position, itemCount);
      }
    }
  }
  