FileTypeDetector

java.lang.Object
- com.drew.imaging.FileTypeDetector

```
public class FileTypeDetector
extends java.lang.Object
```
Examines the a file's first bytes and estimates the file's type.

Field Summary

Fields
Modifier and Type Field Description

private static int _bytesNeeded

private static TypeChecker[] _fixedCheckers

private static ByteTrie<FileType> _root

Constructor Summary

Constructors
Modifier Constructor Description

private FileTypeDetector()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static FileType`	`detectFileType(java.io.InputStream inputStream)`	Examines the file's bytes and estimates the file's type.

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

- Field Detail
  - _root
```
private static final ByteTrie<FileType> _root
```
  - _fixedCheckers
```
private static final TypeChecker[] _fixedCheckers
```
  - _bytesNeeded
```
private static final int _bytesNeeded
```
- Constructor Detail
  - FileTypeDetector
```
private FileTypeDetector()
                  throws java.lang.Exception
```
    Throws:
    
    java.lang.Exception
- Method Detail
  - detectFileType
```
public static FileType detectFileType(java.io.InputStream inputStream)
                               throws java.io.IOException
```
    Examines the file's bytes and estimates the file's type.
    The input stream must support mark and reset, in order to return the stream to the position at which it was provided to this method once completed.
    Requires the stream to contain at least eight bytes.
    
    Throws:
    
    java.io.IOException - if the stream does not support mark/reset.