90 lines
2.7 KiB
Java
90 lines
2.7 KiB
Java
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/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.view;
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import android.os.Parcel;
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import android.os.Parcelable;
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/**
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* A {@link Parcelable} implementation that should be used by inheritance
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* hierarchies to ensure the state of all classes along the chain is saved.
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*/
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public abstract class AbsSavedState implements Parcelable {
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public static final AbsSavedState EMPTY_STATE = new AbsSavedState() {};
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private final Parcelable mSuperState;
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/**
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* Constructor used to make the EMPTY_STATE singleton
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*/
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private AbsSavedState() {
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mSuperState = null;
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}
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/**
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* Constructor called by derived classes when creating their SavedState objects
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*
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* @param superState The state of the superclass of this view
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*/
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protected AbsSavedState(Parcelable superState) {
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if (superState == null) {
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throw new IllegalArgumentException("superState must not be null");
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}
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mSuperState = superState != EMPTY_STATE ? superState : null;
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}
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/**
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* Constructor used when reading from a parcel. Reads the state of the superclass.
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*
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* @param source
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*/
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protected AbsSavedState(Parcel source) {
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// FIXME need class loader
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Parcelable superState = source.readParcelable(null);
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mSuperState = superState != null ? superState : EMPTY_STATE;
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}
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final public Parcelable getSuperState() {
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return mSuperState;
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}
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public int describeContents() {
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return 0;
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}
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public void writeToParcel(Parcel dest, int flags) {
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dest.writeParcelable(mSuperState, flags);
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}
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public static final Parcelable.Creator<AbsSavedState> CREATOR
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= new Parcelable.Creator<AbsSavedState>() {
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public AbsSavedState createFromParcel(Parcel in) {
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Parcelable superState = in.readParcelable(null);
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if (superState != null) {
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throw new IllegalStateException("superState must be null");
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}
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return EMPTY_STATE;
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}
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public AbsSavedState[] newArray(int size) {
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return new AbsSavedState[size];
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}
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};
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}
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