| /* |
| * 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 parcel to read from |
| */ |
| protected AbsSavedState(Parcel source) { |
| this(source, null); |
| } |
| |
| /** |
| * Constructor used when reading from a parcel using a given class loader. |
| * Reads the state of the superclass. |
| * |
| * @param source parcel to read from |
| * @param loader ClassLoader to use for reading |
| */ |
| protected AbsSavedState(Parcel source, ClassLoader loader) { |
| Parcelable superState = source.readParcelable(loader); |
| 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.ClassLoaderCreator<AbsSavedState>() { |
| |
| @Override |
| public AbsSavedState createFromParcel(Parcel in) { |
| return createFromParcel(in, null); |
| } |
| |
| @Override |
| public AbsSavedState createFromParcel(Parcel in, ClassLoader loader) { |
| Parcelable superState = in.readParcelable(loader); |
| if (superState != null) { |
| throw new IllegalStateException("superState must be null"); |
| } |
| return EMPTY_STATE; |
| } |
| |
| @Override |
| public AbsSavedState[] newArray(int size) { |
| return new AbsSavedState[size]; |
| } |
| }; |
| } |