GET method for the case history resource

The GET method returns the entries that make up the case history. You can set parameters to return only entries for specific object types, such as folders or activities, or for specific event types, such as creation or deletion of objects. If you do not set any parameters, all entries are returned. In addition, you can specify whether you want the complete information for the entries that are returned or only the summary information.

To make it easier to display the entries, the GET method always returns a string value for the PropertyValue element, regardless of the type of the property. Therefore, you do not convert integer, float, or datetime properties for display.

URI

/CASEREST/v1/case/{case folder id}/history

The URI for the GET method includes the following path element:

Table 1. Path element for the GET method
Name	Type	Description
`{case folder id}`	String	The GUID that identifies the root folder of the case for which history is to be returned.

The URI for the GET method includes the following parameters. You can combine the object types, such as documents and folders, and event types, such as creation, to obtain specific information. For example, you can return a summary of the additions of documents and folders by specifying the following parameters in the GET method:

&ObjectTypes=Document+CmAcmCaseFolder+CmAcmCaseSubfolder&EventTypes=Creation

Table 2. Parameters for the GET method
Name	Type	Required?	Description
TargetObjectStore	String	Yes	The symbolic name of the object store that contains the case.
BatchSize	Integer	No	The maximum number of entries to be returned. If you do not set this parameter, the method returns a maximum of 200 audit entries. Tip: For best results, set the BatchSize parameter to no more than 200.
ContinuationToken	String	No	The value of the Continuation element that is returned in the JSON response for the previous call to the GET method. Omit this parameter from the request to retrieve the first batch of entries. Specify this parameter in the next request to retrieve the next batch of entries. Enter the value as follows (without quotation marks): `ContinuationToken=34832908d930ddkdj390di3kj` If the Continuation element that is returned in the JSON response contains a null string, there are no more entries to be returned.
ObjectTypes	String	No	The object types for which entries are to be returned. Enter one or more object types by using spaces to separate multiple types. The following list identifies the symbolic names of Content Platform Engine objects that you might need: CmAcmCaseComment Return entries for comments on the case. CmAcmCaseFolder Return entries for case folders. CmAcmCaseSubfolder Return entries for case subfolders. CmAcmCaseTask Return entries for activities. CmAcmVersionSeriesComment Return entries for comments on a document. CmAcmWorkItemComment Return entries for comments on work items. Document Return entries for documents that are associated with the case. When appropriate, the GET method returns entries for subclasses of the selected object types. For example, the GET method returns entries for subclasses of the Document object type automatically. You do not specify each subclass by name. If you do not specify the ObjectTypes parameter, the method returns entries for all object types.
EventTypes	String	No	The type of event for which entries are to be returned. Enter one or more event types by using spaces to separate multiple types. You can query any subclass of the Content Platform Engine ObjectChangeEvent class. If you do not specify the EventTypes parameter, the method returns entries for all event types.
AdditionalProperties	String	No	A list of the symbolic names of the properties to include in the "AdditionalProperties" JSON element in the returned payload. Enter one or more property names. Use spaces to separate multiple names.
AdditionalFilter	String	No	The property expression to be included in the `WHERE` clause of the case history query. This expression is a UTF-8 encoded URL, and must comply with Content Platform Engine SQL syntax.

Request content

The request for this method contains no JSON content.

Response content

The GET method returns the entries in the case history based on the specified objects and events. The GET method also returns one of the following response codes:

Table 3. Response codes for the GET method
Code	Description
200 OK	The method completed successfully and returned the requested entries.
400 Bad Request	The required TargetObjectStore parameter was not specified, or a parameter value was invalid.
404 Not Found	The case folder that was specified in the request URI was not found.
500 Internal Server Error	A server error occurred. For information about the error, see the userMessage element in the JSON response.

Retrieving batches of case history entries

The first time that you call the GET method, you can set the BatchSize parameter to specify the number of entries. However, you do not set the ContinuationToken parameter. The GET method returns the specified number of entries in reverse chronological order, beginning with the newest entry in the log. If there are more entries in the case history, the method also returns a continuation token. You must include the continuation token in the query parameters to retrieve the next batch of entries.

To retrieve the next batch of entries, you make a second call to GET method by using the same values for all parameters except the ContinuationToken parameter. You set the ContinuationToken parameter to the continuation token that is returned by the preceding method call. The method then returns the next set of entries.

Important: For the GET method to return the entries correctly, all the query parameters, except for the continuation token, must be the same in subsequent calls.

You can continue to call the GET method by using the continuation token to return all entries for the case. When there are no more entries, the method does not return a continuation token.

To allow a case worker to view the results that were returned in a previous call to the GET method, you must maintain a string array that contains the nonnull continuation tokens. You can then use the array values to retrieve a specific batch of entries.

For example, assume that you store the continuation tokens in an array named A and that this array contains X tokens. X is also the index of the array element in which the next continuation token are stored. The initial value of X is 0 because there are no continuation results in the array A.

When the GET method returns the first batch of entries, the continuation token in the response is saved in A[0] and the value of X increases by one to 1 because it starts from 0. When the GET method returns the second batch of entries, the continuation token in the response is saved in A[1] and the value of X increases by one to 2.

After the third batch of entries is returned, X is equal to 3 and the continuation token from the fourth call to the GET method will be stored in A[2]. To retrieve the previously returned batches again, you set the ContinuationToken parameter to the following values:

A[1] to retrieve the third batch of entries
A[0] to retrieve the second batch of entries
Null to retrieve the first batch of entries

The general rules for determining the continuation token are:

If X-1 >= 0, then A[X-1] is the continuation token that is required to get the next batch of results.
If X-2 is >= 0, then A[X-2] is the token that is required to return the last batch of results again.
A[X-3] is the token that is required to return the batch that comes before the last batch of results again.

Before you use a continuation token to retrieve a previously retrieved batch of results, you must decrease X correctly to ensure that A[X-1] is the continuation token that is required to return the next batch of results.

Example: GET method request

This sample code requests a summary of the entries for case comments and detailed audit comments for case folders:

#Request to get comment history of a particular case
GET http://example.com:9080/CaseManager/CASEREST/v1/case
/19278CB3-C71C-4DE5-95FE-7C7544020A31/history
?TargetObjectStore=ATOSME&BatchSize=5
&ObjectTypes=CmAcmCaseComment+CmAcmWorkItemComment+
CmAcmVersionSeriesComment&EventTypes=CreationEvent
HTTP/1.1
Host: www.example.net

Example: GET method response

This sample code shows the summary of the entries for case comments and detailed audit comments for case folders. The fields that are contained in the JSON response differ slightly based on the event types and objects that are included. This example illustrates most of the combinations that you might encounter.

#Response
HTTP/1.1 200 OK
Content-Type: application/json;charset-UTF-8
{
  "ContinuationToken":"1,1118.0",
  "Events":
  [
    {
      "EventType":"CreationEvent",
      "EventObjectType":"CmAcmCaseComment",
      "EventTypeLocalizedName":"Creation Event",
      "EventObjectLocalizedName":"Case Comment",
      "EventUser":"P8Admin",
      "EventDateTime":"2010-08-18T18:04:51Z",
      "CmAcmCommentText":"Here is a comment on this case. 
        Not my first.",
      "AdditionalProperties":{"CmAcmCaseIdentifier":""}
    },
    {
      "EventType":"CreationEvent",
      "EventObjectType":"CmAcmVersionSeriesComment",
      "EventTypeLocalizedName":"Creation Event",
      "EventObjectLocalizedName":"Version Series Comment",
      "EventUser":"P8Admin",
      "EventDateTime":"2010-08-18T18:00:38Z",
      "CmAcmCommentText":
          "Test comment for CmAcmVersionSeriesComment.",
      "CmAcmObjectName":"This is the title of the document",
      "AdditionalProperties":{"CmAcmCaseIdentifier":""}
    },
    {
      "EventType":"CreationEvent",
      "EventObjectType":"CmAcmWorkItemComment",
      "EventTypeLocalizedName":"Creation Event",
      "EventObjectLocalizedName":"Work Item Comment",
      "EventUser":"P8Admin",
      "EventDateTime":"2010-08-18T18:00:16Z",
      "CmAcmCommentText":"This was the right resolution for this 
        work item.",
      "CmAcmTaskName":"ETECase1 Task number 1",
      "CmAcmStepName":"test_step_name",
      "AdditionalProperties":{"CmAcmCaseIdentifier":""}
    },
    {
      "EventType":"CmAcmCaseRelatedEvent",
      "EventTypeLocalizedName":"Case Related Event",
      "EventDateTime":"2011-06-10T22:53:59Z",
      "EventUser":"P8Admin",
      "EventObjectType":"CmAcmCaseFolder",
      "EventObjectLocalizedName":"Case Folder",
      "CmAcmCaseFolder":"{B4CD0C8E-8D1D-424A-A84F-1D2F6F4FB773}",
      "CmAcmRelatedCaseFolder":
          "{56872C9A-D84C-4316-BB49-0EB1062D5F34}",
      "CmAcmCaseTitle":"CTLT_CT1_000000100209",
      "CmAcmRelatedCaseTitle":"CTLT_CT1_000000100212",
      "CmAcmCaseIdentifier":"CTLT_CT1_000000100209",
      "CmAcmRelatedCaseIdentifier":"CTLT_CT1_000000100212",
      "CmAcmRelationshipType":101,
      "Description":
          "split case from poster - test for multi-value",
      "CmAcmCategoryName":null,
      "CmAcmRelatedCaseClassName":"CTLT_CT1",
      "RelatedCaseClassLocalizedName":"CT1",
      "CmAcmObjectName":"000000100209",
      "AdditionalProperties":{"CmAcmCaseIdentifier":" 
         CTLT_CT1_000000100209"}
    },
    {
      "EventType":"CmAcmCaseRelatedEvent",
     "EventTypeLocalizedName":"Case Related Event",
     "EventDateTime":"2012-04-09T14:41:52Z",
     "EventUser":"P8Admin",
     "EventObjectType":"CmAcmCaseFolder",
     "EventObjectLocalizedName":"Case Folder",
     "CmAcmCaseFolder":"{B4CD0C8E-8D1D-424A-A84F-1D2F6F4FB773}",
     "CmAcmRelatedCaseFolder":
         "{56872C9A-D84C-4316-BB49-0EB1062D5F34}",
     "CmAcmCaseTitle":"CTLT_CT1_000000100209",
     "CmAcmRelatedCaseTitle":"CTLT_CT1_000000100212",
     "CmAcmCaseIdentifier":"CTLT_CT1_000000100209",
     "CmAcmRelatedCaseIdentifier":"CTLT_CT1_000000100212",
     "CmAcmRelationshipType":0,
     "Description":
         "relating case 1 to case 2 due to similar victim profile",
     "CmAcmObjectName":"000000100209",
     "CmAcmCategoryName":"victim profile",
     "CmAcmRelatedCaseClassName":"CTLT_CT1", 
     "RelatedCaseClassLocalizedName":"CT1",
     "AdditionalProperties":
         {"CmAcmCaseIdentifier":" CTLT_CT1_000000100209"}
    },
    {
     "EventType":"CmAcmCaseRelatedEvent",
     "EventTypeLocalizedName":"Case Related Event",
     "EventDateTime":"2012-04-09T14:48:29Z",
     "EventUser":"P8Admin",
     "EventObjectType":"CmAcmCaseFolder",
     "EventObjectLocalizedName":"Case Folder",
     "CmAcmCaseFolder":"{B4CD0C8E-8D1D-424A-A84F-1D2F6F4FB773}",
     "CmAcmRelatedCaseFolder":"{56872C9A-D84C-4316-BB49-0EB1062D5F34}",
     "CmAcmCaseTitle":"CTLT_CT1_000000100209",
     "CmAcmRelatedCaseTitle":"CTLT_CT1_000000100212",
     "CmAcmCaseIdentifier":"CTLT_CT1_000000100209",
     "CmAcmRelatedCaseIdentifier":"CTLT_CT1_000000100212",
     "CmAcmRelationshipType":1,
     "Description":"unrelating case 1 from case 2",
     "CmAcmObjectName":"000000100209",
     "CmAcmCategoryName":"victim profile",
     "CmAcmRelatedCaseClassName":"CTLT_CT1", 
     "RelatedCaseClassLocalizedName":"CT1",
     "AdditionalProperties":
         {"CmAcmCaseIdentifier":" CTLT_CT1_000000100209"}
    },
    {
     "EventType":"ChangeStateEvent", 
     "EventTypeLocalizedName":"Change State Event", 
     "EventDateTime":"2012-04-14T01:28:52Z", 
     "EventUser":"P8Admin", 
     "EventObjectType":"CmAcmCaseTask", 
     "EventObjectLocalizedName":"Case Task", 
     "CmAcmObjectState":4, 
     "CmAcmLastRestartDate":"", 
     "CmAcmRestartCount":null, 
     "CmAcmDisabledState":0, 
     "CmAcmObjectName":"Case1AutomaticTask2"
    }
    ...
  ]
}