mirror of
https://github.com/M66B/FairEmail.git
synced 2026-04-08 18:13:24 +02:00
@@ -1,105 +0,0 @@
|
||||
/*
|
||||
* Copyright 2018 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 androidx.paging;
|
||||
|
||||
import static java.lang.annotation.RetentionPolicy.SOURCE;
|
||||
|
||||
import androidx.annotation.IntDef;
|
||||
import androidx.annotation.MainThread;
|
||||
import androidx.annotation.NonNull;
|
||||
|
||||
import java.lang.annotation.Retention;
|
||||
import java.util.Collections;
|
||||
import java.util.List;
|
||||
|
||||
class PageResult<T> {
|
||||
/**
|
||||
* Single empty instance to avoid allocations.
|
||||
* <p>
|
||||
* Note, distinct from {@link #INVALID_RESULT} because {@link #isInvalid()} checks instance.
|
||||
*/
|
||||
@SuppressWarnings("unchecked")
|
||||
private static final PageResult EMPTY_RESULT =
|
||||
new PageResult(Collections.emptyList(), 0);
|
||||
|
||||
@SuppressWarnings("unchecked")
|
||||
private static final PageResult INVALID_RESULT =
|
||||
new PageResult(Collections.emptyList(), 0);
|
||||
|
||||
@SuppressWarnings("unchecked")
|
||||
static <T> PageResult<T> getEmptyResult() {
|
||||
return EMPTY_RESULT;
|
||||
}
|
||||
|
||||
@SuppressWarnings("unchecked")
|
||||
static <T> PageResult<T> getInvalidResult() {
|
||||
return INVALID_RESULT;
|
||||
}
|
||||
|
||||
@Retention(SOURCE)
|
||||
@IntDef({INIT, APPEND, PREPEND, TILE})
|
||||
@interface ResultType {}
|
||||
|
||||
static final int INIT = 0;
|
||||
|
||||
// contiguous results
|
||||
static final int APPEND = 1;
|
||||
static final int PREPEND = 2;
|
||||
|
||||
// non-contiguous, tile result
|
||||
static final int TILE = 3;
|
||||
|
||||
@NonNull
|
||||
public final List<T> page;
|
||||
@SuppressWarnings("WeakerAccess")
|
||||
public final int leadingNulls;
|
||||
@SuppressWarnings("WeakerAccess")
|
||||
public final int trailingNulls;
|
||||
@SuppressWarnings("WeakerAccess")
|
||||
public final int positionOffset;
|
||||
|
||||
PageResult(@NonNull List<T> list, int leadingNulls, int trailingNulls, int positionOffset) {
|
||||
this.page = list;
|
||||
this.leadingNulls = leadingNulls;
|
||||
this.trailingNulls = trailingNulls;
|
||||
this.positionOffset = positionOffset;
|
||||
}
|
||||
|
||||
PageResult(@NonNull List<T> list, int positionOffset) {
|
||||
this.page = list;
|
||||
this.leadingNulls = 0;
|
||||
this.trailingNulls = 0;
|
||||
this.positionOffset = positionOffset;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return "Result " + leadingNulls
|
||||
+ ", " + page
|
||||
+ ", " + trailingNulls
|
||||
+ ", offset " + positionOffset;
|
||||
}
|
||||
|
||||
public boolean isInvalid() {
|
||||
return this == INVALID_RESULT;
|
||||
}
|
||||
|
||||
abstract static class Receiver<T> {
|
||||
@MainThread
|
||||
public abstract void onPageResult(@ResultType int type, @NonNull PageResult<T> pageResult);
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user