FallbackResource

All Implemented Interfaces:

org.readium.r2.shared.util.SuspendingCloseable , org.readium.r2.shared.util.data.Readable , org.readium.r2.shared.util.resource.Resource
```
public final class FallbackResource
 implements Resource
                    
```
Resource that will act as a proxy to a fallback resource if the originalResource errors out.

Field Summary

Fields
Modifier and Type	Field	Description
`private final AbsoluteUrl`	`sourceUrl`

Constructor Summary

Constructors
Constructor	Description
`FallbackResource(Resource originalResource, Function1<ReadError, Resource> fallbackResourceFactory)`

Method Summary

Modifier and Type	Method	Description
`AbsoluteUrl`	`getSourceUrl()`	URL locating this resource, if any.
`Try<Resource.Properties, ReadError>`	`properties()`	Properties associated to the resource.
`Try<Long, ReadError>`	`length()`	Returns data length from metadata if available, or calculated from reading the bytes otherwise.
`Try<ByteArray, ReadError>`	`read(LongRange range)`	Reads the bytes at the given range.
`Unit`	`close()`	Closes this object and releases any resources associated with it.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - FallbackResource
```
FallbackResource(Resource originalResource, Function1<ReadError, Resource> fallbackResourceFactory)
```
- Method Detail
  - getSourceUrl
```
 AbsoluteUrl getSourceUrl()
```
    URL locating this resource, if any.
  - properties
```
 Try<Resource.Properties, ReadError> properties()
```
    Properties associated to the resource.
    This is opened for extensions.
  - length
```
 Try<Long, ReadError> length()
```
    Returns data length from metadata if available, or calculated from reading the bytes otherwise.
    This value must be treated as a hint, as it might not reflect the actual bytes length. To get the real length, you need to read the whole resource.
  - read
```
 Try<ByteArray, ReadError> read(LongRange range)
```
    Reads the bytes at the given range.
    When range is null, the whole content is returned. Out-of-range indexes are clamped to the available length automatically.
  - close
```
 Unit close()
```
    Closes this object and releases any resources associated with it. If the object is already closed then invoking this method has no effect.