RangedUri.java
/*
* 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 androidx.media3.exoplayer.dash.manifest;
import android.net.Uri;
import androidx.annotation.Nullable;
import androidx.media3.common.C;
import androidx.media3.common.util.UnstableApi;
import androidx.media3.common.util.UriUtil;
/** Defines a range of data located at a reference uri. */
@UnstableApi
public final class RangedUri {
/** The (zero based) index of the first byte of the range. */
public final long start;
/** The length of the range, or {@link C#LENGTH_UNSET} to indicate that the range is unbounded. */
public final long length;
private final String referenceUri;
private int hashCode;
/**
* Constructs an ranged uri.
*
* @param referenceUri The reference uri.
* @param start The (zero based) index of the first byte of the range.
* @param length The length of the range, or {@link C#LENGTH_UNSET} to indicate that the range is
* unbounded.
*/
public RangedUri(@Nullable String referenceUri, long start, long length) {
this.referenceUri = referenceUri == null ? "" : referenceUri;
this.start = start;
this.length = length;
}
/**
* Returns the resolved {@link Uri} represented by the instance.
*
* @param baseUri The base Uri.
* @return The {@link Uri} represented by the instance.
*/
public Uri resolveUri(String baseUri) {
return UriUtil.resolveToUri(baseUri, referenceUri);
}
/**
* Returns the resolved uri represented by the instance as a string.
*
* @param baseUri The base Uri.
* @return The uri represented by the instance.
*/
public String resolveUriString(String baseUri) {
return UriUtil.resolve(baseUri, referenceUri);
}
/**
* Attempts to merge this {@link RangedUri} with another and an optional common base uri.
*
* <p>A merge is successful if both instances define the same {@link Uri} after resolution with
* the base uri, and if one starts the byte after the other ends, forming a contiguous region with
* no overlap.
*
* <p>If {@code other} is null then the merge is considered unsuccessful, and null is returned.
*
* @param other The {@link RangedUri} to merge.
* @param baseUri The base Uri.
* @return The merged {@link RangedUri} if the merge was successful. Null otherwise.
*/
@Nullable
public RangedUri attemptMerge(@Nullable RangedUri other, String baseUri) {
final String resolvedUri = resolveUriString(baseUri);
if (other == null || !resolvedUri.equals(other.resolveUriString(baseUri))) {
return null;
} else if (length != C.LENGTH_UNSET && start + length == other.start) {
return new RangedUri(
resolvedUri,
start,
other.length == C.LENGTH_UNSET ? C.LENGTH_UNSET : length + other.length);
} else if (other.length != C.LENGTH_UNSET && other.start + other.length == start) {
return new RangedUri(
resolvedUri,
other.start,
length == C.LENGTH_UNSET ? C.LENGTH_UNSET : other.length + length);
} else {
return null;
}
}
@Override
public int hashCode() {
if (hashCode == 0) {
int result = 17;
result = 31 * result + (int) start;
result = 31 * result + (int) length;
result = 31 * result + referenceUri.hashCode();
hashCode = result;
}
return hashCode;
}
@Override
public boolean equals(@Nullable Object obj) {
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
RangedUri other = (RangedUri) obj;
return this.start == other.start
&& this.length == other.length
&& referenceUri.equals(other.referenceUri);
}
@Override
public String toString() {
return "RangedUri("
+ "referenceUri="
+ referenceUri
+ ", start="
+ start
+ ", length="
+ length
+ ")";
}
}