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/*
* 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);
}
}
}
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