Package org.apache.olingo.server.core.etag

Class ETagHelperImpl

java.lang.Object

org.apache.olingo.server.core.etag.ETagHelperImpl

All Implemented Interfaces:

ETagHelper

public class ETagHelperImpl
extends Object
implements ETagHelper

Constructor Summary

Constructors

Constructor	Description
ETagHelperImpl()

Method Summary

Modifier and Type	Method	Description
void	checkChangePreconditions(String eTag, Collection<String> ifMatchHeaders, Collection<String> ifNoneMatchHeaders)	Checks the preconditions of a change request (with HTTP methods PUT, PATCH, or DELETE) with a given ETag value against the If-Match and If-None-Match HTTP headers.
boolean	checkReadPreconditions(String eTag, Collection<String> ifMatchHeaders, Collection<String> ifNoneMatchHeaders)	Checks the preconditions of a read request with a given ETag value against the If-Match and If-None-Match HTTP headers.
protected ETagInformation	createETagInformation(Collection<String> values)	Creates ETag information from the values of a HTTP header containing a list of entity tags or a single star character, i.e., If-Match and If-None-Match.

Methods inherited from class java.lang.Object

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

Constructor Details

ETagHelperImpl

public ETagHelperImpl()

Method Details

checkReadPreconditions

public boolean checkReadPreconditions(String eTag,
 Collection<String> ifMatchHeaders,
 Collection<String> ifNoneMatchHeaders)
                               throws PreconditionException

Description copied from interface: ETagHelper

Checks the preconditions of a read request with a given ETag value against the If-Match and If-None-Match HTTP headers.

If the given ETag value is not matched by the ETag information in the If-Match headers, and there are ETags in the headers to be matched, a "Precondition Failed" exception is thrown.

If the given ETag value is matched by the ETag information in the If-None-Match headers, true is returned, and applications are supposed to return an empty response with a "Not Modified" status code and the ETag header, false otherwise.

All matching uses weak comparison as described in RFC 7232, section 2.3.2.

This method does not nothing and returns false if the ETag value is null.

Specified by:

checkReadPreconditions in interface ETagHelper

Parameters:

eTag - the ETag value to match

ifMatchHeaders - the If-Match header values

ifNoneMatchHeaders - the If-None-Match header values

Returns:

whether a "Not Modified" response should be used

Throws:

PreconditionException

checkChangePreconditions

public void checkChangePreconditions(String eTag,
 Collection<String> ifMatchHeaders,
 Collection<String> ifNoneMatchHeaders)
                              throws PreconditionException

Description copied from interface: ETagHelper

Checks the preconditions of a change request (with HTTP methods PUT, PATCH, or DELETE) with a given ETag value against the If-Match and If-None-Match HTTP headers.

If the given ETag value is not matched by the ETag information in the If-Match headers, and there are ETags in the headers to be matched, or if the given ETag value is matched by the ETag information in the If-None-Match headers, a "Precondition Failed" exception is thrown.

All matching uses weak comparison as described in RFC 7232, section 2.3.2.

This method does not nothing if the ETag value is null.

Specified by:

checkChangePreconditions in interface ETagHelper

Parameters:

eTag - the ETag value to match

ifMatchHeaders - the If-Match header values

ifNoneMatchHeaders - the If-None-Match header values

Throws:

PreconditionException

createETagInformation

protected ETagInformation createETagInformation(Collection<String> values)

Creates ETag information from the values of a HTTP header containing a list of entity tags or a single star character, i.e., If-Match and If-None-Match.

Parameters:

values - the collection of header values

Returns:

an ETagInformation instance