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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.setupwizardlib.items;
     18 
     19 import android.content.Context;
     20 import android.content.res.TypedArray;
     21 import android.util.AttributeSet;
     22 import android.util.Log;
     23 
     24 import com.android.setupwizardlib.R;
     25 
     26 import java.util.ArrayList;
     27 
     28 /**
     29  * An abstract item hierarchy; provides default implementation for ID and observers.
     30  */
     31 public abstract class AbstractItemHierarchy implements ItemHierarchy {
     32 
     33     /* static section */
     34 
     35     private static final String TAG = "AbstractItemHierarchy";
     36 
     37     /* non-static section */
     38 
     39     private ArrayList<Observer> mObservers = new ArrayList<>();
     40     private int mId = 0;
     41 
     42     public AbstractItemHierarchy() {
     43     }
     44 
     45     public AbstractItemHierarchy(Context context, AttributeSet attrs) {
     46         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SuwAbstractItem);
     47         mId = a.getResourceId(R.styleable.SuwAbstractItem_android_id, 0);
     48         a.recycle();
     49     }
     50 
     51     public void setId(int id) {
     52         mId = id;
     53     }
     54 
     55     public int getId() {
     56         return mId;
     57     }
     58 
     59     public int getViewId() {
     60         return getId();
     61     }
     62 
     63     @Override
     64     public void registerObserver(Observer observer) {
     65         mObservers.add(observer);
     66     }
     67 
     68     @Override
     69     public void unregisterObserver(Observer observer) {
     70         mObservers.remove(observer);
     71     }
     72 
     73     /**
     74      * @see Observer#onChanged(ItemHierarchy)
     75      */
     76     public void notifyChanged() {
     77         for (Observer observer : mObservers) {
     78             observer.onChanged(this);
     79         }
     80     }
     81 
     82     /**
     83      * @see Observer#onItemRangeChanged(ItemHierarchy, int, int)
     84      */
     85     public void notifyItemRangeChanged(int position, int itemCount) {
     86         if (position < 0) {
     87             Log.w(TAG, "notifyItemRangeChanged: Invalid position=" + position);
     88             return;
     89         }
     90         if (itemCount < 0) {
     91             Log.w(TAG, "notifyItemRangeChanged: Invalid itemCount=" + itemCount);
     92             return;
     93         }
     94 
     95         for (Observer observer : mObservers) {
     96             observer.onItemRangeChanged(this, position, itemCount);
     97         }
     98     }
     99 
    100     /**
    101      * @see Observer#onItemRangeInserted(ItemHierarchy, int, int)
    102      */
    103     public void notifyItemRangeInserted(int position, int itemCount) {
    104         if (position < 0) {
    105             Log.w(TAG, "notifyItemRangeInserted: Invalid position=" + position);
    106             return;
    107         }
    108         if (itemCount < 0) {
    109             Log.w(TAG, "notifyItemRangeInserted: Invalid itemCount=" + itemCount);
    110             return;
    111         }
    112 
    113         for (Observer observer : mObservers) {
    114             observer.onItemRangeInserted(this, position, itemCount);
    115         }
    116     }
    117 
    118     /**
    119      * @see Observer#onItemRangeMoved(ItemHierarchy, int, int, int)
    120      */
    121     public void notifyItemRangeMoved(int fromPosition, int toPosition, int itemCount) {
    122         if (fromPosition < 0) {
    123             Log.w(TAG, "notifyItemRangeMoved: Invalid fromPosition=" + fromPosition);
    124             return;
    125         }
    126         if (toPosition < 0) {
    127             Log.w(TAG, "notifyItemRangeMoved: Invalid toPosition=" + toPosition);
    128             return;
    129         }
    130         if (itemCount < 0) {
    131             Log.w(TAG, "notifyItemRangeMoved: Invalid itemCount=" + itemCount);
    132             return;
    133         }
    134 
    135         for (Observer observer : mObservers) {
    136             observer.onItemRangeMoved(this, fromPosition, toPosition, itemCount);
    137         }
    138     }
    139 
    140     /**
    141      * @see Observer#onItemRangeRemoved(ItemHierarchy, int, int)
    142      */
    143     public void notifyItemRangeRemoved(int position, int itemCount) {
    144         if (position < 0) {
    145             Log.w(TAG, "notifyItemRangeInserted: Invalid position=" + position);
    146             return;
    147         }
    148         if (itemCount < 0) {
    149             Log.w(TAG, "notifyItemRangeInserted: Invalid itemCount=" + itemCount);
    150             return;
    151         }
    152 
    153         for (Observer observer : mObservers) {
    154             observer.onItemRangeRemoved(this, position, itemCount);
    155         }
    156     }
    157 }
    158