com.jetradar.multibackstack.BackStackEntry.java Source code

Introduction

Here is the source code for com.jetradar.multibackstack.BackStackEntry.java

Source

/*
 * Copyright (C) 2016 JetRadar
 *
 * 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.jetradar.multibackstack;

import android.content.Context;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.Fragment.SavedState;
import android.support.v4.app.FragmentManager;

public class BackStackEntry implements Parcelable {
    public final String fname;
    public final SavedState state;
    public final Bundle args;

    public BackStackEntry(@NonNull String fname, @Nullable SavedState state, @Nullable Bundle args) {
        this.fname = fname;
        this.state = state;
        this.args = args;
    }

    @NonNull
    public static BackStackEntry create(@NonNull FragmentManager fm, @NonNull Fragment f) {
        String fname = f.getClass().getName();
        SavedState state = fm.saveFragmentInstanceState(f);
        Bundle args = f.getArguments();
        return new BackStackEntry(fname, state, args);
    }

    @NonNull
    public Fragment toFragment(@NonNull Context context) {
        Fragment f = Fragment.instantiate(context, fname);
        f.setInitialSavedState(state);
        f.setArguments(args);
        return f;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel out, int flags) {
        out.writeString(fname);
        out.writeBundle(args);

        if (state == null) {
            out.writeInt(NO_STATE);
        } else if (state.getClass() == SavedState.class) {
            out.writeInt(SAVED_STATE);
            state.writeToParcel(out, flags);
        } else {
            out.writeInt(PARCELABLE_STATE);
            out.writeParcelable(state, flags);
        }
    }

    private BackStackEntry(Parcel in) {
        final ClassLoader loader = getClass().getClassLoader();
        fname = in.readString();
        args = in.readBundle(loader);

        switch (in.readInt()) {
        case NO_STATE:
            state = null;
            break;
        case SAVED_STATE:
            state = SavedState.CREATOR.createFromParcel(in);
            break;
        case PARCELABLE_STATE:
            state = in.readParcelable(loader);
            break;
        default:
            throw new IllegalStateException();
        }
    }

    private static final int NO_STATE = -1;
    private static final int SAVED_STATE = 0;
    private static final int PARCELABLE_STATE = 1;

    public static final Creator<BackStackEntry> CREATOR = new Creator<BackStackEntry>() {

        @Override
        public BackStackEntry createFromParcel(Parcel in) {
            return new BackStackEntry(in);
        }

        @Override
        public BackStackEntry[] newArray(int size) {
            return new BackStackEntry[size];
        }
    };
}