DataSpec

public static final int FLAG_ALLOW_CACHE_FRAGMENTATION = 4

Allows fragmentation of this request into multiple cache files, meaning a cache eviction policy will be able to evict individual fragments of the data. Depending on the cache implementation, setting this flag may also enable more concurrent access to the data (e.g. reading one fragment whilst writing another).

public static final int FLAG_ALLOW_GZIP = 1

Allows an underlying network stack to request that the server use gzip compression.

Should not typically be set if the data being requested is already compressed (e.g. most audio and video requests). May be set when requesting other data.

When a DataSource is used to request data with this flag set, and if the does make a network request, then the value returned from open will typically be LENGTH_UNSET. The data read from read will be the decompressed data.

public static final int FLAG_DONT_CACHE_IF_LENGTH_UNKNOWN = 2

Prevents caching if the length cannot be resolved when the DataSource is opened.

public static final int FLAG_MIGHT_NOT_USE_FULL_NETWORK_SPEED = 8

Indicates there are known external factors that might prevent the data from being loaded at full network speed (e.g. server throttling or unfinished live media chunks).

public static final int HTTP_METHOD_GET = 1

HTTP GET method.

public static final int HTTP_METHOD_HEAD = 3

HTTP HEAD method.

public static final int HTTP_METHOD_POST = 2

HTTP POST method.

public final long absoluteStreamPosition

The absolute position of the data in the resource.

public final @Nullable Object customData

Application specific data.

This field is intended for advanced use cases in which applications require the ability to attach custom data to DataSpec instances. The custom data should be immutable.

@DataSpec.Flags
public final int flags

Request flags.

public final @Nullable byte[] httpBody

The HTTP request body, null otherwise. If the body is non-null, then httpBody.length will be non-zero.

@DataSpec.HttpMethod
public final int httpMethod

The HTTP method to use when requesting the data. This value will be ignored by non-HTTP implementations.

public final Map<String, String> httpRequestHeaders

Additional HTTP headers to use when requesting the data.

Note: This map is for additional headers specific to the data being requested. It does not include headers that are set directly by HttpDataSource implementations. In particular, this means the following headers are not included:

• Range: HttpDataSource implementations derive the Range header from position and length.
• Accept-Encoding: HttpDataSource implementations derive the Accept-Encoding header based on whether flags includes FLAG_ALLOW_GZIP.
• User-Agent: HttpDataSource implementations set the User-Agent header directly.
• Other headers set at the HttpDataSource layer. I.e., headers set using setRequestProperty, and using setDefaultRequestProperties.

public final @Nullable String key

A key that uniquely identifies the resource. Used for cache indexing. May be null if the data spec is not intended to be used in conjunction with a cache.

public final long length

The length of the data, or LENGTH_UNSET.

public final long position

The position of the data when read from uri.

public final Uri uri

A Uri from which data belonging to the resource can be read.

public final long uriPositionOffset

The offset of the data located at uri within the resource.

Equal to 0 unless uri provides access to a subset of the resource. As an example, consider a resource that can be requested over the network and is 1000 bytes long. If uri points to a local file that contains just bytes [200-300], then this field will be set to 200.

This field can be ignored except for in specific circumstances where the absolute position in the resource is required in a DataSource chain. One example is when a needs to decrypt the content as it's read. In this case the absolute position in the resource is typically needed to correctly initialize the decryption algorithm.

public DataSpec(Uri uri)

Constructs an instance.

public DataSpec(Uri uri, @DataSpec.Flags int flags)

Constructs an instance.

public DataSpec(Uri uri, long position, long length)

Constructs an instance.

public DataSpec(Uri uri, long position, long length, @Nullable String key)

Constructs an instance.

public DataSpec(
    Uri uri,
    long position,
    long length,
    @Nullable String key,
    @DataSpec.Flags int flags
)

Constructs an instance.

public DataSpec(
    Uri uri,
    long absoluteStreamPosition,
    long position,
    long length,
    @Nullable String key,
    @DataSpec.Flags int flags
)

Constructs an instance where uriPositionOffset may be non-zero.

public DataSpec(
    Uri uri,
    long position,
    long length,
    @Nullable String key,
    @DataSpec.Flags int flags,
    Map<String, String> httpRequestHeaders
)

Constructs an instance.

public DataSpec(
    Uri uri,
    @Nullable byte[] postBody,
    long absoluteStreamPosition,
    long position,
    long length,
    @Nullable String key,
    @DataSpec.Flags int flags
)

Construct a instance where uriPositionOffset may be non-zero. The httpMethod is inferred from postBody. If postBody is non-null then httpMethod is set to HTTP_METHOD_POST. If postBody is null then httpMethod is set to HTTP_METHOD_GET.

public DataSpec(
    Uri uri,
    @DataSpec.HttpMethod int httpMethod,
    @Nullable byte[] httpBody,
    long absoluteStreamPosition,
    long position,
    long length,
    @Nullable String key,
    @DataSpec.Flags int flags
)

Construct a instance where uriPositionOffset may be non-zero.

public DataSpec(
    Uri uri,
    @DataSpec.HttpMethod int httpMethod,
    @Nullable byte[] httpBody,
    long absoluteStreamPosition,
    long position,
    long length,
    @Nullable String key,
    @DataSpec.Flags int flags,
    Map<String, String> httpRequestHeaders
)

Construct a instance where uriPositionOffset may be non-zero.

public DataSpec.Builder buildUpon()

Returns a DataSpec.Builder initialized with the values of this instance.

public final String getHttpMethodString()

Returns the uppercase HTTP method name (e.g., "GET", "POST", "HEAD") corresponding to the httpMethod.

public static String getStringForHttpMethod(@DataSpec.HttpMethod int httpMethod)

Returns an uppercase HTTP method name (e.g., "GET", "POST", "HEAD") corresponding to the given HttpMethod.

public boolean isFlagSet(@DataSpec.Flags int flag)

Returns whether the given flag is set.

public DataSpec subrange(long offset)

Returns a data spec that represents a subrange of the data defined by this DataSpec. The subrange includes data from the offset up to the end of this DataSpec.

public DataSpec subrange(long offset, long length)

Returns a data spec that represents a subrange of the data defined by this DataSpec.

public String toString()

public DataSpec withAdditionalHeaders(
    Map<String, String> additionalHttpRequestHeaders
)

Returns a copy this data spec with additional HTTP request headers. Headers in additionalHttpRequestHeaders will overwrite any headers already in the data spec that have the same keys.

public DataSpec withRequestHeaders(Map<String, String> httpRequestHeaders)

Returns a copy of this data spec with the specified HTTP request headers. Headers already in the data spec are not copied to the new instance.

public DataSpec withUri(Uri uri)

Returns a copy of this data spec with the specified Uri.