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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 org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.cache;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import java.io.File;
/**
* Defines a span of data that may or may not be cached (as indicated by {@link #isCached}).
*/
public class CacheSpan implements Comparable<CacheSpan> {
/**
* The cache key that uniquely identifies the original stream.
*/
public final String key;
/**
* The position of the {@link CacheSpan} in the original stream.
*/
public final long position;
/**
* The length of the {@link CacheSpan}, or {@link C#LENGTH_UNSET} if this is an open-ended hole.
*/
public final long length;
/**
* Whether the {@link CacheSpan} is cached.
*/
public final boolean isCached;
/** The file corresponding to this {@link CacheSpan}, or null if {@link #isCached} is false. */
@Nullable public final File file;
/** The last touch timestamp, or {@link C#TIME_UNSET} if {@link #isCached} is false. */
public final long lastTouchTimestamp;
/**
* Creates a hole CacheSpan which isn't cached, has no last touch timestamp and no file
* associated.
*
* @param key The cache key that uniquely identifies the original stream.
* @param position The position of the {@link CacheSpan} in the original stream.
* @param length The length of the {@link CacheSpan}, or {@link C#LENGTH_UNSET} if this is an
* open-ended hole.
*/
public CacheSpan(String key, long position, long length) {
this(key, position, length, C.TIME_UNSET, null);
}
/**
* Creates a CacheSpan.
*
* @param key The cache key that uniquely identifies the original stream.
* @param position The position of the {@link CacheSpan} in the original stream.
* @param length The length of the {@link CacheSpan}, or {@link C#LENGTH_UNSET} if this is an
* open-ended hole.
* @param lastTouchTimestamp The last touch timestamp, or {@link C#TIME_UNSET} if {@link
* #isCached} is false.
* @param file The file corresponding to this {@link CacheSpan}, or null if it's a hole.
*/
public CacheSpan(
String key, long position, long length, long lastTouchTimestamp, @Nullable File file) {
this.key = key;
this.position = position;
this.length = length;
this.isCached = file != null;
this.file = file;
this.lastTouchTimestamp = lastTouchTimestamp;
}
/**
* Returns whether this is an open-ended {@link CacheSpan}.
*/
public boolean isOpenEnded() {
return length == C.LENGTH_UNSET;
}
/**
* Returns whether this is a hole {@link CacheSpan}.
*/
public boolean isHoleSpan() {
return !isCached;
}
@Override
public int compareTo(@NonNull CacheSpan another) {
if (!key.equals(another.key)) {
return key.compareTo(another.key);
}
long startOffsetDiff = position - another.position;
return startOffsetDiff == 0 ? 0 : ((startOffsetDiff < 0) ? -1 : 1);
}
}
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