io.cdap.wrangler

Class RequestExtractor

java.lang.Object

io.cdap.wrangler.RequestExtractor

public final class RequestExtractor
extends Object

This class RequestExtractor provides utility functions for extracting different aspects of the request. It provides functionality to extract headers and content.

Field Summary

Fields

Modifier and Type	Field and Description
static String	CHARSET_HEADER
static String	CONTENT_TYPE_HEADER

Constructor Summary

Constructors

Constructor and Description
RequestExtractor(io.cdap.cdap.api.service.http.HttpServiceRequest request)

Method Summary

Modifier and Type	Method and Description
ConnectionMeta	getConnectionMeta() Get a ConnectionMeta object from the request body.
ConnectionMeta	getConnectionMeta(ConnectionType expectedType) Get a ConnectionMeta object from the request body.
byte[]	getContent()
String	getContent(Charset charset) Returns the content by converting it to UNICODE from the provided charset.
String	getContent(String charset)
<T> T	getContent(String charset, Class<T> type) Returns the content transformed into a Class defined.
String	getHeader(String name, String defaultValue) Extracts the HTTP header, if the header is not present, then default value is returned.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

CONTENT_TYPE_HEADER

public static final String CONTENT_TYPE_HEADER

See Also:

Constant Field Values

CHARSET_HEADER

public static final String CHARSET_HEADER

See Also:

Constant Field Values

Constructor Detail

RequestExtractor

public RequestExtractor(io.cdap.cdap.api.service.http.HttpServiceRequest request)

Method Detail

getHeader

public String getHeader(String name,
                        String defaultValue)

Extracts the HTTP header, if the header is not present, then default value is returned.

Parameters:

name - of the HTTP header to be extracted.

defaultValue - value to returned if header doesn't exist.

Returns:

value defined for the header.

getContent

@Nullable
public byte[] getContent()

Returns:

Content as received by the HTTP multipart/form body.

getContent

@Nullable
public String getContent(Charset charset)

Returns the content by converting it to UNICODE from the provided charset.

Parameters:

charset - of the content being extracted and converted to UNICODE.

Returns:

UNICODE representation of the content, else null.

getContent

@Nullable
public String getContent(String charset)

getConnectionMeta

public ConnectionMeta getConnectionMeta()

Get a ConnectionMeta object from the request body.

Returns:

the connection meta object

Throws:

IllegalArgumentException - if the body is empty or not a valid ConnectionMeta

getConnectionMeta

public ConnectionMeta getConnectionMeta(ConnectionType expectedType)

Get a ConnectionMeta object from the request body.

Returns:

the connection meta object

Throws:

IllegalArgumentException - if the body is empty or not a valid ConnectionMeta

getContent

@Nullable
public <T> T getContent(String charset,
                                  Class<T> type)

Returns the content transformed into a Class defined. It first transforms from the charset into unicode and then applies the transformation.

Parameters:

charset - source charset of the content.

type - class to converted to.

Returns:

instance of type T as defined by the class.