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/*
* 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 android.view;
import android.os.Parcel;
import android.os.Parcelable;
/**
* A {@link Parcelable} implementation that should be used by inheritance
* hierarchies to ensure the state of all classes along the chain is saved.
*/
public abstract class AbsSavedState implements Parcelable {
public static final AbsSavedState EMPTY_STATE = new AbsSavedState() {};
private final Parcelable mSuperState;
/**
* Constructor used to make the EMPTY_STATE singleton
*/
private AbsSavedState() {
mSuperState = null;
}
/**
* Constructor called by derived classes when creating their SavedState objects
*
* @param superState The state of the superclass of this view
*/
protected AbsSavedState(Parcelable superState) {
if (superState == null) {
throw new IllegalArgumentException("superState must not be null");
}
mSuperState = superState != EMPTY_STATE ? superState : null;
}
/**
* Constructor used when reading from a parcel. Reads the state of the superclass.
*
* @param source
*/
protected AbsSavedState(Parcel source) {
// FIXME need class loader
Parcelable superState = source.readParcelable(null);
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 Parcelable.Creator<AbsSavedState> CREATOR
= new Parcelable.Creator<AbsSavedState>() {
public AbsSavedState createFromParcel(Parcel in) {
Parcelable superState = in.readParcelable(null);
if (superState != null) {
throw new IllegalStateException("superState must be null");
}
return EMPTY_STATE;
}
public AbsSavedState[] newArray(int size) {
return new AbsSavedState[size];
}
};
}
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