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/*
* Copyright (C) 2016 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.android.dialer.common;
import android.support.annotation.CheckResult;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.annotation.VisibleForTesting;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
/** Utility methods for working with Fragments */
public class FragmentUtils {
private static Object parentForTesting;
@VisibleForTesting(otherwise = VisibleForTesting.NONE)
public static void setParentForTesting(Object parentForTesting) {
FragmentUtils.parentForTesting = parentForTesting;
}
/**
* @return The parent of frag that implements the callbackInterface or null if no such parent can
* be found
*/
@CheckResult(suggest = "#checkParent(Fragment, Class)}")
@Nullable
public static <T> T getParent(@NonNull Fragment fragment, @NonNull Class<T> callbackInterface) {
if (callbackInterface.isInstance(parentForTesting)) {
@SuppressWarnings("unchecked") // Casts are checked using runtime methods
T parent = (T) parentForTesting;
return parent;
}
Fragment parentFragment = fragment.getParentFragment();
if (callbackInterface.isInstance(parentFragment)) {
@SuppressWarnings("unchecked") // Casts are checked using runtime methods
T parent = (T) parentFragment;
return parent;
} else {
FragmentActivity activity = fragment.getActivity();
if (callbackInterface.isInstance(activity)) {
@SuppressWarnings("unchecked") // Casts are checked using runtime methods
T parent = (T) activity;
return parent;
}
}
return null;
}
/** Returns the parent or throws. Should perform check elsewhere(e.g. onAttach, newInstance). */
@NonNull
public static <T> T getParentUnsafe(
@NonNull Fragment fragment, @NonNull Class<T> callbackInterface) {
return Assert.isNotNull(getParent(fragment, callbackInterface));
}
/**
* Ensures fragment has a parent that implements the corresponding interface
*
* @param frag The Fragment whose parents are to be checked
* @param callbackInterface The interface class that a parent should implement
* @throws IllegalStateException if no parents are found that implement callbackInterface
*/
public static void checkParent(@NonNull Fragment frag, @NonNull Class<?> callbackInterface)
throws IllegalStateException {
if (parentForTesting != null) {
return;
}
if (FragmentUtils.getParent(frag, callbackInterface) == null) {
String parent =
frag.getParentFragment() == null
? frag.getActivity().getClass().getName()
: frag.getParentFragment().getClass().getName();
throw new IllegalStateException(
frag.getClass().getName()
+ " must be added to a parent"
+ " that implements "
+ callbackInterface.getName()
+ ". Instead found "
+ parent);
}
}
}
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