/*
* Copyright (C) 2013 Etsy
* Copyright (C) 2006 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.marshalchen.common.uimodule.staggeredgridview;
import android.os.Parcel;
import android.os.Parcelable;
/**
* A {@link android.os.Parcelable} implementation that should be used by inheritance
* hierarchies to ensure the state of all classes along the chain is saved.
*/
public abstract class ClassLoaderSavedState implements Parcelable {
public static final ClassLoaderSavedState EMPTY_STATE = new ClassLoaderSavedState() {};
private Parcelable mSuperState = EMPTY_STATE;
private ClassLoader mClassLoader;
/**
* Constructor used to make the EMPTY_STATE singleton
*/
private ClassLoaderSavedState() {
mSuperState = null;
mClassLoader = null;
}
/**
* Constructor called by derived classes when creating their ListSavedState objects
*
* @param superState The state of the superclass of this view
*/
protected ClassLoaderSavedState(Parcelable superState, ClassLoader classLoader) {
mClassLoader = classLoader;
if (superState == null) {
throw new IllegalArgumentException("superState must not be null");
}
else {
mSuperState = superState != EMPTY_STATE ? superState : null;
}
}
/**
* Constructor used when reading from a parcel. Reads the state of the superclass.
*
* @param source
*/
protected ClassLoaderSavedState(Parcel source) {
// ETSY : we're using the passed super class loader unlike AbsSavedState
Parcelable superState = source.readParcelable(mClassLoader);
mSuperState = superState != null ? superState : EMPTY_STATE;
}
final public Parcelable getSuperState() {
return mSuperState;
}
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel dest, int flags) {
dest.writeParcelable(mSuperState, flags);
}
public static final Creator<ClassLoaderSavedState> CREATOR
= new Creator<ClassLoaderSavedState>() {
public ClassLoaderSavedState createFromParcel(Parcel in) {
Parcelable superState = in.readParcelable(null);
if (superState != null) {
throw new IllegalStateException("superState must be null");
}
return EMPTY_STATE;
}
public ClassLoaderSavedState[] newArray(int size) {
return new ClassLoaderSavedState[size];
}
};
}